Jorijn van der Graaf
b95c594be8
debug.log handed `last` to the timeline query, where 0 means every entry, so `log --follow --last 0` streamed the whole ring of up to 8192 entries before the new ones, where an agent reads it as tail -n 0 -f: nothing old, only what comes next. 0 now means no backlog, followed or not, and the guide says that --follow starts with the last 50. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
1089 lines
50 KiB
C++
1089 lines
50 KiB
C++
// SPDX-License-Identifier: LGPL-3.0-only
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// SPDX-FileCopyrightText: Copyright (C) 2026 Catcrafts®
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module;
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#include <signal.h>
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#include <sys/prctl.h>
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#include <unistd.h>
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module Crafter.Debug:Session_impl;
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import std;
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import Crafter.Debug.Core;
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import :Registry;
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import :Timeline;
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import :Condition;
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import :Session;
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using namespace Crafter::Debug;
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using Crafter::Debug::Detail::Exchange;
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// Named, not anonymous: Session::State's members take these types, and a
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// type with internal linkage in the signature of one with module linkage is
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// an exposure clang warns about. Nothing here is exported.
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namespace Crafter::Debug::SessionImpl {
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using Clock = std::chrono::steady_clock;
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// Request parameters, decoded through Codec so a mistyped request is
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// answered with every mistake in it, as an app command would be.
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struct ListParams {
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std::string glob = "*";
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};
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struct LogParams {
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std::uint32_t last = 50;
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std::string level = "info";
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std::string category;
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std::string grep;
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std::optional<std::uint64_t> sinceFrame;
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std::uint64_t afterSequence = 0;
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std::vector<std::string> kinds;
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bool follow = false;
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std::uint32_t forMs = 30 * 60 * 1000;
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};
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struct PauseParams {
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std::optional<std::string> when;
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bool onCheck = false;
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bool trap = false;
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bool clear = false;
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};
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struct StepParams {
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std::uint32_t count = 1;
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};
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struct WaitParams {
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std::optional<std::string> condition;
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std::optional<std::uint32_t> frames;
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std::optional<std::string> event;
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bool paused = false;
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};
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struct QuitParams {
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bool force = false;
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};
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struct GetParams {
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std::vector<std::string> paths;
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};
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struct SetParams {
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Required<std::string> path;
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Required<Value> value;
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};
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struct TraceParams {
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std::vector<std::string> paths;
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std::uint32_t frames = 60;
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bool history = false;
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};
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struct Job {
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std::string method;
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Value params;
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std::shared_ptr<Exchange> exchange;
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Clock::time_point deadline;
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};
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struct Pending {
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std::string method;
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std::function<std::optional<Result<Value>>()> poll;
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std::shared_ptr<Exchange> exchange;
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Clock::time_point deadline;
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};
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enum class WaitKind : std::uint8_t {
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Frames,
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Condition,
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Event,
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Paused,
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Steps,
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};
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struct Waiter {
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WaitKind kind = WaitKind::Frames;
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std::shared_ptr<Exchange> exchange;
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Clock::time_point deadline;
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Clock::time_point since;
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std::uint64_t targetFrame = 0;
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std::optional<Condition> condition;
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std::string event;
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};
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struct TraceRun {
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std::vector<std::string> paths;
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std::uint32_t remaining = 0;
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std::vector<std::uint64_t> frames;
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std::vector<std::vector<Value>> series;
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std::shared_ptr<Exchange> exchange;
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Clock::time_point deadline;
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};
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struct Follower {
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Detail::TimelineQuery query;
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std::shared_ptr<Exchange> exchange;
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Clock::time_point until;
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};
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// The screenshot source, which an app may set before its Session exists.
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std::mutex captureMutex;
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std::function<Async<std::vector<std::byte>>()> captureSource;
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// The one Session's state, for the free functions.
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std::atomic<Session::State*> current{ nullptr };
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template<class P>
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std::optional<P> DecodeParams(const Value& params, Exchange& exchange) {
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P decoded{};
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DecodeContext context;
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Crafter::Debug::Decode(params.IsNull() ? Value::MakeObject() : params, decoded, context);
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if (!context.Ok()) {
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exchange.Reply(MakeErrorReply(Codes::invalidParams, context.Report()));
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return std::nullopt;
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}
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return decoded;
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}
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void ReplyWith(Exchange& exchange, Result<Value> result) {
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exchange.Reply(result.Ok() ? MakeReply(std::move(result.Get())) : MakeErrorReply(result.GetError().code, result.GetError().message));
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}
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Value Object(std::initializer_list<std::pair<std::string_view, Value>> members) {
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Value object = Value::MakeObject();
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for (const auto& [key, value] : members) object.Set(key, value);
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return object;
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}
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std::string ProgramName() {
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std::error_code ec;
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const std::filesystem::path exe = std::filesystem::read_symlink("/proc/self/exe", ec);
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return ec ? std::string("app") : exe.filename().string();
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}
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std::string NewToken() {
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std::random_device random;
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return std::format("{:08x}{:08x}{:08x}{:08x}", random(), random(), random(), random());
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}
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// A tracer (a debugger) is attached to this process: TracerPid in
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// /proc/self/status is nonzero.
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bool TracerAttached() {
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std::ifstream status("/proc/self/status");
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std::string line;
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while (std::getline(status, line)) {
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if (line.starts_with("TracerPid:")) return line.find_first_not_of("0\t ", 10) != std::string::npos;
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}
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return false;
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}
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std::string FileName(std::string_view path) {
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const std::size_t slash = path.rfind('/');
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return std::string(slash == std::string_view::npos ? path : path.substr(slash + 1));
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}
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std::string Abbreviated(std::string text, std::size_t limit = 200) {
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if (text.size() <= limit) return text;
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text.resize(limit);
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return text + "...";
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}
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Value EntryValue(const TimelineEntry& entry) {
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Value value = Object({
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{ "sequence", Value(entry.sequence) },
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{ "frame", Value(entry.frame) },
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{ "seconds", Value(entry.seconds) },
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{ "kind", Value(EntryKindName(entry.kind)) },
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{ "category", Value(entry.category) },
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{ "message", Value(entry.message) },
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{ "file", Value(entry.file) },
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{ "line", Value(entry.line) },
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});
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if (!entry.payload.IsNull()) value.Set("payload", entry.payload);
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if (entry.kind == EntryKind::Check) value.Set("count", Value(entry.count));
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return value;
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}
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std::expected<Value, std::string> ResolvePath(std::string_view path) {
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Detail::Resolved resolved = Detail::Registry::Instance().Resolve(path);
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if (!resolved.Ok()) return std::unexpected(std::move(resolved.error));
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return std::move(resolved.value);
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}
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// min, max, mean, first, last and how often the value changed, for a
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// traced series; numbers only for the arithmetic ones.
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Value Stats(std::span<const std::uint64_t> frames, std::span<const Value> values) {
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Value stats = Value::MakeObject();
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if (values.empty()) return stats;
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stats.Set("first", values.front());
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stats.Set("last", values.back());
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std::uint64_t changes = 0;
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std::optional<std::uint64_t> firstChange;
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for (std::size_t i = 1; i < values.size(); ++i) {
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if (!(values[i] == values[i - 1])) {
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++changes;
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if (!firstChange) firstChange = frames[i];
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}
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}
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stats.Set("changes", Value(changes));
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if (firstChange) stats.Set("firstChangeFrame", Value(*firstChange));
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if (std::ranges::all_of(values, [](const Value& value) { return value.IsNumber(); })) {
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double sum = 0;
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double low = values.front().AsNumber();
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double high = low;
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for (const Value& value : values) {
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const double number = value.AsNumber();
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sum += number;
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low = std::min(low, number);
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high = std::max(high, number);
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}
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stats.Set("min", Value(low));
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stats.Set("max", Value(high));
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stats.Set("mean", Value(sum / static_cast<double>(values.size())));
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}
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return stats;
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}
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constexpr std::array<std::string_view, 13> builtinMethods = {
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"debug.hello", "debug.status", "debug.list", "debug.log", "debug.pause", "debug.resume", "debug.step",
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"debug.wait", "debug.quit", "debug.get", "debug.set", "debug.trace", "debug.screenshot",
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};
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}
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using namespace Crafter::Debug::SessionImpl;
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namespace Crafter::Debug {
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struct Session::State {
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SessionOptions options;
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std::string token = NewToken();
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std::string name;
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Clock::time_point started = Clock::now();
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std::int64_t pid = ::getpid();
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// Guards what transport threads, the Pump thread and logging threads share.
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std::mutex mutex;
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std::deque<Job> jobs;
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std::vector<Waiter> waiters;
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std::vector<Follower> followers;
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std::optional<Condition> armedWhen;
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bool armedOnCheck = false;
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bool armedTrap = false;
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std::string pauseReason;
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bool shutDown = false;
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// The Pump thread's own.
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std::vector<Pending> pendings;
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std::vector<TraceRun> traces;
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bool quitHandled = false;
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std::optional<Clock::time_point> lastPump;
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std::atomic<bool> paused{ false };
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std::atomic<std::uint32_t> steps{ 0 };
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std::atomic<bool> pauseSupported{ false };
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std::atomic<bool> quitRequested{ false };
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std::atomic<std::uint64_t> frame{ 0 };
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std::atomic<std::int64_t> lastPumpNanos{ -1 };
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std::atomic<double> fps{ 0 };
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std::optional<Group> builtins;
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explicit State(SessionOptions given) : options(std::move(given)) {
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name = options.name.empty() ? ProgramName() : options.name;
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}
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void Start() {
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builtins.emplace("debug");
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builtins->Watch("frame", [this] { return frame.load(); }, { .help = "frames pumped so far" });
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builtins->Watch("paused", [this] { return paused.load(); }, { .help = "whether Advance() holds the app" });
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builtins->Watch("fps", [this] { return fps.load(); }, { .help = "Pumps per second, smoothed" });
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}
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void Agent(std::string_view method, const Value& params) {
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const std::string text = params.IsNull() ? std::string(method) : std::format("{} {}", method, Abbreviated(params.Dump()));
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Detail::Timeline::Instance().Append(Detail::MakeEntry(EntryKind::Agent, "agent", text, std::source_location::current()));
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}
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void PauseNow(std::string reason, bool trap) {
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paused.store(true);
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{
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std::lock_guard lock(mutex);
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pauseReason = reason;
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}
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Detail::Timeline::Instance().Append(Detail::MakeEntry(EntryKind::Pause, "debug", std::format("paused: {}", reason), std::source_location::current()));
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if (trap && TracerAttached()) ::raise(SIGTRAP);
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}
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// ---- requests, on transport threads ----
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void Handle(const Value& request, const std::shared_ptr<Exchange>& exchange) {
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try {
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Dispatch(request, exchange);
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} catch (const std::exception& error) {
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exchange->Reply(MakeErrorReply(Codes::exception, error.what()));
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} catch (...) {
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exchange->Reply(MakeErrorReply(Codes::exception, "the session threw something that is not a std::exception"));
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}
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}
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void Dispatch(const Value& request, const std::shared_ptr<Exchange>& exchange) {
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if (!request.IsObject()) {
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return exchange->Reply(MakeErrorReply(Codes::invalidRequest, R"(a request is a JSON object: {"token", "method", "params", "timeoutMs"})"));
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}
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const Value* tokenValue = request.Find("token");
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if (tokenValue == nullptr || !tokenValue->IsString() || tokenValue->AsString() != token) {
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return exchange->Reply(MakeErrorReply(Codes::unauthorized, "wrong or missing token: crafter-debug reads it from the instance's discovery file"));
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}
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const Value* methodValue = request.Find("method");
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if (methodValue == nullptr || !methodValue->IsString()) {
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return exchange->Reply(MakeErrorReply(Codes::invalidRequest, "a request needs a method"));
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}
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const std::string method = methodValue->AsString();
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const Value* paramsValue = request.Find("params");
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const Value params = paramsValue != nullptr ? *paramsValue : Value();
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std::int64_t timeoutMs = 30'000;
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if (const Value* timeout = request.Find("timeoutMs"); timeout != nullptr && timeout->IsInteger() && timeout->AsInteger() > 0) {
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timeoutMs = timeout->AsInteger();
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}
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const Clock::time_point deadline = Clock::now() + std::chrono::milliseconds(timeoutMs);
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{
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std::lock_guard lock(mutex);
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if (shutDown) return exchange->Reply(MakeErrorReply(Codes::shuttingDown, "the app is shutting down"));
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}
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if (method == "debug.hello") return exchange->Reply(MakeReply(Hello()));
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if (method == "debug.status") return exchange->Reply(MakeReply(Status()));
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if (method == "debug.list") return List(params, *exchange);
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if (method == "debug.log") return Logs(params, exchange, deadline);
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if (method == "debug.pause") return Pause(params, *exchange);
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if (method == "debug.resume") return Resume(*exchange);
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if (method == "debug.step") return Step(params, exchange, deadline);
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if (method == "debug.wait") return Wait(params, exchange, deadline);
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if (method == "debug.quit") return Quit(params, exchange);
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const bool builtin = std::ranges::find(builtinMethods, method) != builtinMethods.end();
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if (method.starts_with("debug.") && !builtin) {
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const auto suggestion = Suggest(method, builtinMethods);
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return exchange->Reply(MakeErrorReply(Codes::unknownMethod, suggestion ? std::format("no method '{}'; did you mean '{}'?", method, *suggestion)
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: std::format("no method '{}'", method)));
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}
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if (!builtin && Detail::Registry::Instance().FindCommand(method) == nullptr) {
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const auto suggestion = Detail::Registry::Instance().SuggestCommand(method);
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return exchange->Reply(MakeErrorReply(Codes::unknownMethod, suggestion ? std::format("no command '{}'; did you mean '{}'?", method, *suggestion)
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: std::format("no command '{}'; crafter-debug cmds lists them", method)));
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}
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std::lock_guard lock(mutex);
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jobs.push_back({ method, params, exchange, deadline });
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}
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Value Hello() const {
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return Object({
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{ "protocol", Value(protocolVersion) },
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{ "library", Value(libraryVersion) },
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{ "name", Value(name) },
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{ "pid", Value(pid) },
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});
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}
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Value Status() {
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Value status = Object({
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{ "name", Value(name) },
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{ "pid", Value(pid) },
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{ "frame", Value(frame.load()) },
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{ "fps", Value(fps.load()) },
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{ "paused", Value(paused.load()) },
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{ "pauseSupported", Value(pauseSupported.load()) },
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{ "quitRequested", Value(quitRequested.load()) },
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});
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const std::int64_t last = lastPumpNanos.load();
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const std::int64_t sinceStart = std::chrono::duration_cast<std::chrono::nanoseconds>(Clock::now() - started).count();
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status.Set("lastPumpAgoMs", last < 0 ? Value() : Value((sinceStart - last) / 1'000'000));
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{
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std::lock_guard lock(mutex);
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status.Set("pauseReason", Value(pauseReason));
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status.Set("queued", Value(jobs.size()));
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status.Set("waiting", Value(waiters.size()));
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status.Set("following", Value(followers.size()));
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Value armed = Value::MakeObject();
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if (armedWhen) armed.Set("when", Value(armedWhen->Text()));
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if (armedOnCheck) armed.Set("onCheck", Value(true));
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status.Set("armed", std::move(armed));
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}
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std::uint64_t failures = 0;
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Value sites = Value::MakeArray();
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for (const Detail::CheckSite& site : Detail::Timeline::Instance().CheckSites()) {
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failures += site.failures;
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sites.Push(Object({ { "file", Value(FileName(site.file)) }, { "line", Value(site.line) }, { "category", Value(site.category) }, { "failures", Value(site.failures) } }));
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}
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status.Set("checkFailures", Value(failures));
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status.Set("checkSites", std::move(sites));
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status.Set("commands", Value(Detail::Registry::Instance().Commands().size()));
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status.Set("watches", Value(Detail::Registry::Instance().Watches().size()));
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return status;
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}
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void List(const Value& params, Exchange& exchange) {
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const auto decoded = DecodeParams<ListParams>(params, exchange);
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if (!decoded) return;
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Value commands = Value::MakeArray();
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for (const auto& command : Detail::Registry::Instance().Commands(decoded->glob)) {
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commands.Push(Object({ { "name", Value(command->name) }, { "description", Value(command->description) }, { "args", command->args }, { "returns", command->returns } }));
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}
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Value watches = Value::MakeArray();
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for (const auto& watch : Detail::Registry::Instance().Watches(decoded->glob)) {
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watches.Push(Object({ { "path", Value(watch->path) }, { "type", watch->type }, { "help", Value(watch->help) }, { "readOnly", Value(!watch->set) } }));
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}
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Value samples = Value::MakeArray();
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for (const std::string& path : Detail::Registry::Instance().SamplePaths(decoded->glob)) samples.Push(Value(path));
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exchange.Reply(MakeReply(Object({ { "commands", std::move(commands) }, { "watches", std::move(watches) }, { "samples", std::move(samples) } })));
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}
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void Logs(const Value& params, const std::shared_ptr<Exchange>& exchange, Clock::time_point) {
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const auto decoded = DecodeParams<LogParams>(params, *exchange);
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if (!decoded) return;
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Detail::TimelineQuery query;
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query.afterSequence = decoded->afterSequence;
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query.sinceFrame = decoded->sinceFrame;
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query.category = decoded->category;
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query.grep = decoded->grep;
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if (decoded->level == "info") {
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query.minLevel = 0;
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} else if (decoded->level == "warn") {
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query.minLevel = 1;
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} else if (decoded->level == "error") {
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query.minLevel = 2;
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} else {
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return exchange->Reply(MakeErrorReply(Codes::invalidParams, std::format("level: '{}' is not one of info, warn, error", decoded->level)));
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}
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for (const std::string& kind : decoded->kinds) {
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bool known = false;
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for (std::uint8_t k = 0; k <= static_cast<std::uint8_t>(EntryKind::Stdio); ++k) {
|
|
if (EntryKindName(static_cast<EntryKind>(k)) == kind) {
|
|
query.kinds.push_back(static_cast<EntryKind>(k));
|
|
known = true;
|
|
}
|
|
}
|
|
if (!known) return exchange->Reply(MakeErrorReply(Codes::invalidParams, std::format("kinds: '{}' is not one of log, warn, error, check, event, agent, pause, stdio", kind)));
|
|
}
|
|
// `last` 0 means none, as with tail -n 0: a follower that only
|
|
// wants what comes next. (A TimelineQuery's 0 means all.)
|
|
Detail::TimelineQuery backlog = query;
|
|
backlog.last = decoded->last;
|
|
const auto recent = [&] { return decoded->last == 0 ? std::vector<TimelineEntry>() : Detail::Timeline::Instance().Query(backlog); };
|
|
if (!decoded->follow) {
|
|
Value entries = Value::MakeArray();
|
|
for (const TimelineEntry& entry : recent()) entries.Push(EntryValue(entry));
|
|
return exchange->Reply(MakeReply(Object({ { "entries", std::move(entries) }, { "lastSequence", Value(Detail::Timeline::Instance().LastSequence()) } })));
|
|
}
|
|
// The backlog and the registration happen under one lock, which
|
|
// the listener also takes before streaming, so a follower sees
|
|
// every entry once and in order. Stream never blocks.
|
|
std::lock_guard lock(mutex);
|
|
const std::uint64_t upTo = Detail::Timeline::Instance().LastSequence();
|
|
for (const TimelineEntry& entry : recent()) {
|
|
if (entry.sequence > upTo) continue;
|
|
if (!exchange->Stream(Object({ { "entry", EntryValue(entry) } }))) return;
|
|
}
|
|
Follower follower{ query, exchange, Clock::now() + std::chrono::milliseconds(decoded->forMs) };
|
|
follower.query.afterSequence = std::max(query.afterSequence, upTo);
|
|
followers.push_back(std::move(follower));
|
|
}
|
|
|
|
void Pause(const Value& params, Exchange& exchange) {
|
|
const auto decoded = DecodeParams<PauseParams>(params, exchange);
|
|
if (!decoded) return;
|
|
if (decoded->clear) {
|
|
{
|
|
std::lock_guard lock(mutex);
|
|
armedWhen.reset();
|
|
armedOnCheck = false;
|
|
armedTrap = false;
|
|
}
|
|
Agent("pause --clear", Value());
|
|
return exchange.Reply(MakeReply(Object({ { "armed", Value(false) } })));
|
|
}
|
|
if (!pauseSupported.load()) {
|
|
return exchange.Reply(MakeErrorReply(Codes::pauseUnsupported, "this app never calls Debug::Advance() or Debug::Paused(), so pausing would hold nothing; "
|
|
"gate the simulation on them (see the README)"));
|
|
}
|
|
if (decoded->trap && !decoded->when && !decoded->onCheck) {
|
|
return exchange.Reply(MakeErrorReply(Codes::invalidParams, "trap needs when or onCheck: it stops the app where that happens"));
|
|
}
|
|
if (decoded->when) {
|
|
std::optional<Condition> condition;
|
|
try {
|
|
condition = Condition::Parse(*decoded->when);
|
|
} catch (const ConditionError& error) {
|
|
return exchange.Reply(MakeErrorReply(Codes::conditionError, error.what()));
|
|
}
|
|
{
|
|
std::lock_guard lock(mutex);
|
|
armedWhen = std::move(condition);
|
|
armedTrap = decoded->trap;
|
|
}
|
|
Agent("pause --when", Value(*decoded->when));
|
|
return exchange.Reply(MakeReply(Object({ { "armed", Value("when") }, { "condition", Value(*decoded->when) } })));
|
|
}
|
|
if (decoded->onCheck) {
|
|
{
|
|
std::lock_guard lock(mutex);
|
|
armedOnCheck = true;
|
|
armedTrap = decoded->trap;
|
|
}
|
|
Agent("pause --on-check", Value());
|
|
return exchange.Reply(MakeReply(Object({ { "armed", Value("onCheck") } })));
|
|
}
|
|
Agent("pause", Value());
|
|
PauseNow("an agent asked", false);
|
|
exchange.Reply(MakeReply(Object({ { "paused", Value(true) }, { "frame", Value(frame.load()) } })));
|
|
}
|
|
|
|
void Resume(Exchange& exchange) {
|
|
Agent("resume", Value());
|
|
steps.store(0);
|
|
paused.store(false);
|
|
{
|
|
std::lock_guard lock(mutex);
|
|
pauseReason.clear();
|
|
}
|
|
Detail::Timeline::Instance().Append(Detail::MakeEntry(EntryKind::Pause, "debug", "resumed", std::source_location::current()));
|
|
exchange.Reply(MakeReply(Object({ { "paused", Value(false) }, { "frame", Value(frame.load()) } })));
|
|
}
|
|
|
|
void Step(const Value& params, const std::shared_ptr<Exchange>& exchange, Clock::time_point deadline) {
|
|
const auto decoded = DecodeParams<StepParams>(params, *exchange);
|
|
if (!decoded) return;
|
|
if (!pauseSupported.load()) {
|
|
return exchange->Reply(MakeErrorReply(Codes::pauseUnsupported, "this app never calls Debug::Advance() or Debug::Paused(), so there is nothing to step"));
|
|
}
|
|
if (!paused.load()) return exchange->Reply(MakeErrorReply(Codes::notPaused, "step works while paused: run crafter-debug pause first"));
|
|
if (decoded->count == 0) return exchange->Reply(MakeErrorReply(Codes::invalidParams, "count: step at least 1"));
|
|
Agent("step", Object({ { "count", Value(decoded->count) } }));
|
|
std::lock_guard lock(mutex);
|
|
steps.fetch_add(decoded->count);
|
|
waiters.push_back({ .kind = WaitKind::Steps, .exchange = exchange, .deadline = deadline, .since = Clock::now() });
|
|
}
|
|
|
|
void Wait(const Value& params, const std::shared_ptr<Exchange>& exchange, Clock::time_point deadline) {
|
|
const auto decoded = DecodeParams<WaitParams>(params, *exchange);
|
|
if (!decoded) return;
|
|
const std::int32_t asked = (decoded->condition ? 1 : 0) + (decoded->frames ? 1 : 0) + (decoded->event ? 1 : 0) + (decoded->paused ? 1 : 0);
|
|
if (asked != 1) return exchange->Reply(MakeErrorReply(Codes::invalidParams, "wait for one thing: condition, frames, event or paused"));
|
|
Waiter waiter{ .exchange = exchange, .deadline = deadline, .since = Clock::now() };
|
|
if (decoded->condition) {
|
|
try {
|
|
waiter.condition = Condition::Parse(*decoded->condition);
|
|
} catch (const ConditionError& error) {
|
|
return exchange->Reply(MakeErrorReply(Codes::conditionError, error.what()));
|
|
}
|
|
waiter.kind = WaitKind::Condition;
|
|
} else if (decoded->frames) {
|
|
waiter.kind = WaitKind::Frames;
|
|
waiter.targetFrame = frame.load() + *decoded->frames;
|
|
} else if (decoded->event) {
|
|
waiter.kind = WaitKind::Event;
|
|
waiter.event = *decoded->event;
|
|
} else {
|
|
waiter.kind = WaitKind::Paused;
|
|
if (paused.load()) {
|
|
std::lock_guard lock(mutex);
|
|
return exchange->Reply(MakeReply(Object({ { "frame", Value(frame.load()) }, { "reason", Value(pauseReason) } })));
|
|
}
|
|
}
|
|
std::lock_guard lock(mutex);
|
|
waiters.push_back(std::move(waiter));
|
|
}
|
|
|
|
void Quit(const Value& params, const std::shared_ptr<Exchange>& exchange) {
|
|
const auto decoded = DecodeParams<QuitParams>(params, *exchange);
|
|
if (!decoded) return;
|
|
Agent(decoded->force ? "quit --force" : "quit", Value());
|
|
quitRequested.store(true);
|
|
if (decoded->force) {
|
|
// From the thread the reply leaves on, so the main loop
|
|
// need not run: --force is for an app whose loop is stuck.
|
|
return exchange->ReplyThen(MakeReply(Object({ { "quitting", Value(true) }, { "force", Value(true) } })), [] { std::_Exit(0); });
|
|
}
|
|
exchange->Reply(MakeReply(Object({ { "quitting", Value(true) } })));
|
|
}
|
|
|
|
// ---- the Pump thread ----
|
|
|
|
void Pump() {
|
|
const Clock::time_point now = Clock::now();
|
|
const std::uint64_t current = frame.fetch_add(1) + 1;
|
|
Detail::SetFrame(current);
|
|
if (lastPump) {
|
|
const double seconds = std::chrono::duration<double>(now - *lastPump).count();
|
|
if (seconds > 0) {
|
|
const double previous = fps.load();
|
|
fps.store(previous == 0 ? 1 / seconds : previous * 0.9 + 0.1 / seconds);
|
|
}
|
|
}
|
|
lastPump = now;
|
|
lastPumpNanos.store(std::chrono::duration_cast<std::chrono::nanoseconds>(now - started).count());
|
|
|
|
RunJobs(now);
|
|
PollPendings(now);
|
|
CheckArmed();
|
|
ServeWaiters(now, current);
|
|
RecordTraces(now, current);
|
|
ExpireFollowers(now);
|
|
if (quitRequested.load() && !quitHandled) {
|
|
quitHandled = true;
|
|
if (options.onQuit) options.onQuit();
|
|
}
|
|
}
|
|
|
|
void RunJobs(Clock::time_point now) {
|
|
std::deque<Job> taken;
|
|
{
|
|
std::lock_guard lock(mutex);
|
|
taken.swap(jobs);
|
|
}
|
|
for (Job& job : taken) {
|
|
if (now > job.deadline) {
|
|
job.exchange->Reply(MakeErrorReply(Codes::timeout, "not run: the app did not Pump before the request's timeout"));
|
|
continue;
|
|
}
|
|
try {
|
|
Execute(job);
|
|
} catch (const std::exception& error) {
|
|
job.exchange->Reply(MakeErrorReply(Codes::exception, error.what()));
|
|
} catch (...) {
|
|
job.exchange->Reply(MakeErrorReply(Codes::exception, "something that is not a std::exception was thrown"));
|
|
}
|
|
}
|
|
}
|
|
|
|
void Execute(Job& job) {
|
|
Agent(job.method, job.params);
|
|
if (job.method == "debug.get") return Get(job);
|
|
if (job.method == "debug.set") return Set(job);
|
|
if (job.method == "debug.trace") return StartTrace(job);
|
|
if (job.method == "debug.screenshot") return Screenshot(job);
|
|
const auto command = Detail::Registry::Instance().FindCommand(job.method);
|
|
if (!command) return job.exchange->Reply(MakeErrorReply(Codes::unknownMethod, std::format("'{}' was unregistered before it ran", job.method)));
|
|
Detail::CommandOutcome outcome = command->invoke(job.params);
|
|
if (outcome.done) return ReplyWith(*job.exchange, std::move(*outcome.done));
|
|
pendings.push_back({ job.method, std::move(outcome.pending), job.exchange, job.deadline });
|
|
}
|
|
|
|
void Get(Job& job) {
|
|
const auto decoded = DecodeParams<GetParams>(job.params, *job.exchange);
|
|
if (!decoded) return;
|
|
if (decoded->paths.empty()) return job.exchange->Reply(MakeErrorReply(Codes::invalidParams, "paths: name at least one path, or a glob such as 'fort1.*'"));
|
|
Detail::Registry& registry = Detail::Registry::Instance();
|
|
Value values = Value::MakeObject();
|
|
Value errors = Value::MakeObject();
|
|
const auto read = [&](std::string_view path) {
|
|
Detail::Resolved resolved = registry.Resolve(path);
|
|
if (resolved.Ok()) {
|
|
values.Set(path, std::move(resolved.value));
|
|
} else {
|
|
errors.Set(path, Value(resolved.error));
|
|
}
|
|
};
|
|
for (const std::string& path : decoded->paths) {
|
|
if (path.find_first_of("*?") == std::string::npos) {
|
|
read(path);
|
|
continue;
|
|
}
|
|
const auto watches = registry.Watches(path);
|
|
const auto samples = registry.SamplePaths(path);
|
|
if (watches.empty() && samples.empty()) errors.Set(path, Value("no watch or sample matches"));
|
|
for (const auto& watch : watches) read(watch->path);
|
|
for (const std::string& sample : samples) {
|
|
if (values.Find(sample) == nullptr) read(sample);
|
|
}
|
|
}
|
|
if (values.Size() == 0 && errors.Size() != 0) {
|
|
std::string message;
|
|
for (const auto& [path, error] : errors.Members()) message += message.empty() ? error.AsString() : "; " + error.AsString();
|
|
return job.exchange->Reply(MakeErrorReply(Codes::unknownPath, message));
|
|
}
|
|
Value result = Object({ { "values", std::move(values) } });
|
|
if (errors.Size() != 0) result.Set("errors", std::move(errors));
|
|
job.exchange->Reply(MakeReply(std::move(result)));
|
|
}
|
|
|
|
void Set(Job& job) {
|
|
const auto decoded = DecodeParams<SetParams>(job.params, *job.exchange);
|
|
if (!decoded) return;
|
|
if (const auto error = Detail::Registry::Instance().Set(*decoded->path, *decoded->value)) {
|
|
return job.exchange->Reply(MakeErrorReply(error->code, error->message));
|
|
}
|
|
Detail::Resolved now = Detail::Registry::Instance().Resolve(*decoded->path);
|
|
job.exchange->Reply(MakeReply(Object({ { "path", Value(*decoded->path) }, { "value", now.Ok() ? now.value : *decoded->value } })));
|
|
}
|
|
|
|
void StartTrace(Job& job) {
|
|
const auto decoded = DecodeParams<TraceParams>(job.params, *job.exchange);
|
|
if (!decoded) return;
|
|
if (decoded->paths.empty()) return job.exchange->Reply(MakeErrorReply(Codes::invalidParams, "paths: name at least one path"));
|
|
Detail::Registry& registry = Detail::Registry::Instance();
|
|
if (decoded->history) {
|
|
Value series = Value::MakeObject();
|
|
for (const std::string& path : decoded->paths) {
|
|
const std::vector<Detail::SamplePoint> points = registry.SampleHistory(path);
|
|
if (points.empty()) return job.exchange->Reply(MakeErrorReply(Codes::unknownPath, std::format("no sample history for '{}'; history is kept for Sample() paths", path)));
|
|
std::vector<std::uint64_t> frames;
|
|
std::vector<Value> values;
|
|
for (const Detail::SamplePoint& point : points) {
|
|
frames.push_back(point.frame);
|
|
values.push_back(point.value);
|
|
}
|
|
Value framesValue = Value::MakeArray();
|
|
for (const std::uint64_t f : frames) framesValue.Push(Value(f));
|
|
series.Set(path, Object({ { "frames", std::move(framesValue) }, { "values", Value::MakeArray(values) }, { "stats", Stats(frames, values) } }));
|
|
}
|
|
return job.exchange->Reply(MakeReply(Object({ { "series", std::move(series) } })));
|
|
}
|
|
if (decoded->frames == 0) return job.exchange->Reply(MakeErrorReply(Codes::invalidParams, "frames: trace at least 1 frame"));
|
|
for (const std::string& path : decoded->paths) {
|
|
const Detail::Resolved resolved = registry.Resolve(path);
|
|
if (!resolved.Ok()) return job.exchange->Reply(MakeErrorReply(Codes::unknownPath, resolved.error));
|
|
}
|
|
traces.push_back({ decoded->paths, decoded->frames, {}, std::vector<std::vector<Value>>(decoded->paths.size()), job.exchange, job.deadline });
|
|
}
|
|
|
|
void Screenshot(Job& job) {
|
|
std::function<Async<std::vector<std::byte>>()> source;
|
|
{
|
|
std::lock_guard lock(captureMutex);
|
|
source = captureSource;
|
|
}
|
|
if (!source) {
|
|
return job.exchange->Reply(MakeErrorReply(Codes::noCapture, "this app has no screenshot source: call Debug::SetCapture (the README has the Crafter.Graphics version)"));
|
|
}
|
|
pendings.push_back({
|
|
"debug.screenshot",
|
|
[async = source()]() mutable -> std::optional<Result<Value>> {
|
|
std::optional<Result<std::vector<std::byte>>> polled = async.Poll();
|
|
if (!polled) return std::nullopt;
|
|
if (!polled->Ok()) return Result<Value>(polled->GetError());
|
|
const std::vector<std::byte>& png = polled->Get();
|
|
return Result<Value>(Object({ { "png", Value(Base64Encode(png)) }, { "bytes", Value(png.size()) } }));
|
|
},
|
|
job.exchange,
|
|
job.deadline,
|
|
});
|
|
}
|
|
|
|
void PollPendings(Clock::time_point now) {
|
|
for (auto it = pendings.begin(); it != pendings.end();) {
|
|
try {
|
|
std::optional<Result<Value>> polled = it->poll();
|
|
if (polled) {
|
|
ReplyWith(*it->exchange, std::move(*polled));
|
|
it = pendings.erase(it);
|
|
continue;
|
|
}
|
|
} catch (const std::exception& error) {
|
|
it->exchange->Reply(MakeErrorReply(Codes::exception, std::format("the result threw: {}", error.what())));
|
|
it = pendings.erase(it);
|
|
continue;
|
|
} catch (...) {
|
|
it->exchange->Reply(MakeErrorReply(Codes::exception, "the result threw something that is not a std::exception"));
|
|
it = pendings.erase(it);
|
|
continue;
|
|
}
|
|
if (now > it->deadline) {
|
|
it->exchange->Reply(MakeErrorReply(Codes::timeout, std::format("{} ran, but its result was not ready before the request's timeout", it->method)));
|
|
it = pendings.erase(it);
|
|
continue;
|
|
}
|
|
++it;
|
|
}
|
|
}
|
|
|
|
void CheckArmed() {
|
|
std::optional<Condition> when;
|
|
bool trap = false;
|
|
{
|
|
std::lock_guard lock(mutex);
|
|
if (!armedWhen) return;
|
|
when = armedWhen;
|
|
trap = armedTrap;
|
|
}
|
|
const auto result = when->Evaluate(ResolvePath);
|
|
if (result && !*result) return;
|
|
{
|
|
std::lock_guard lock(mutex);
|
|
armedWhen.reset();
|
|
}
|
|
if (!result) {
|
|
Detail::Timeline::Instance().Append(Detail::MakeEntry(EntryKind::Warn, "debug", std::format("pause --when '{}' disarmed: {}", when->Text(), result.error()), std::source_location::current()));
|
|
return;
|
|
}
|
|
PauseNow(std::format("'{}' became true", when->Text()), trap);
|
|
}
|
|
|
|
std::string TimeoutMessage(const Waiter& waiter) const {
|
|
const auto waited = std::chrono::duration_cast<std::chrono::milliseconds>(Clock::now() - waiter.since).count();
|
|
switch (waiter.kind) {
|
|
case WaitKind::Frames: return std::format("frame {} was not reached within {} ms; the app is at frame {}", waiter.targetFrame, waited, frame.load());
|
|
case WaitKind::Paused: return std::format("the app did not pause within {} ms", waited);
|
|
case WaitKind::Steps: return std::format("the steps were not taken within {} ms: does the app call Debug::Advance() or TakeSteps() every frame?", waited);
|
|
case WaitKind::Event: return std::format("no '{}' event within {} ms", waiter.event, waited);
|
|
case WaitKind::Condition: {
|
|
std::string values;
|
|
for (const std::string& path : waiter.condition->Paths()) {
|
|
const auto value = ResolvePath(path);
|
|
if (!values.empty()) values += ", ";
|
|
values += value ? std::format("{} is {}", path, Abbreviated(value->Dump(), 80)) : std::format("{}: {}", path, value.error());
|
|
}
|
|
return std::format("'{}' was not true within {} ms{}", waiter.condition->Text(), waited, values.empty() ? std::string() : std::format(" ({})", values));
|
|
}
|
|
}
|
|
return "timed out";
|
|
}
|
|
|
|
void ServeWaiters(Clock::time_point now, std::uint64_t current) {
|
|
// Event waiters stay in the list, where the listener finds them.
|
|
std::vector<Waiter> taken;
|
|
{
|
|
std::lock_guard lock(mutex);
|
|
for (auto it = waiters.begin(); it != waiters.end();) {
|
|
if (it->kind == WaitKind::Event) {
|
|
if (now > it->deadline) {
|
|
it->exchange->Reply(MakeErrorReply(Codes::timeout, TimeoutMessage(*it)));
|
|
it = waiters.erase(it);
|
|
} else {
|
|
++it;
|
|
}
|
|
continue;
|
|
}
|
|
taken.push_back(std::move(*it));
|
|
it = waiters.erase(it);
|
|
}
|
|
}
|
|
std::vector<Waiter> remaining;
|
|
for (Waiter& waiter : taken) {
|
|
bool done = false;
|
|
switch (waiter.kind) {
|
|
case WaitKind::Frames:
|
|
if (current >= waiter.targetFrame) {
|
|
waiter.exchange->Reply(MakeReply(Object({ { "frame", Value(current) } })));
|
|
done = true;
|
|
}
|
|
break;
|
|
case WaitKind::Condition: {
|
|
const auto result = waiter.condition->Evaluate(ResolvePath);
|
|
if (!result) {
|
|
waiter.exchange->Reply(MakeErrorReply(Codes::conditionError, result.error()));
|
|
done = true;
|
|
} else if (*result) {
|
|
waiter.exchange->Reply(MakeReply(Object({ { "frame", Value(current) }, { "condition", Value(waiter.condition->Text()) } })));
|
|
done = true;
|
|
}
|
|
break;
|
|
}
|
|
case WaitKind::Paused:
|
|
if (paused.load()) {
|
|
std::string reason;
|
|
{
|
|
std::lock_guard lock(mutex);
|
|
reason = pauseReason;
|
|
}
|
|
waiter.exchange->Reply(MakeReply(Object({ { "frame", Value(current) }, { "reason", Value(reason) } })));
|
|
done = true;
|
|
}
|
|
break;
|
|
case WaitKind::Steps:
|
|
if (steps.load() == 0) {
|
|
waiter.exchange->Reply(MakeReply(Object({ { "frame", Value(current) }, { "paused", Value(paused.load()) } })));
|
|
done = true;
|
|
}
|
|
break;
|
|
case WaitKind::Event: break;
|
|
}
|
|
if (!done && now > waiter.deadline) {
|
|
waiter.exchange->Reply(MakeErrorReply(Codes::timeout, TimeoutMessage(waiter)));
|
|
done = true;
|
|
}
|
|
if (!done) remaining.push_back(std::move(waiter));
|
|
}
|
|
std::lock_guard lock(mutex);
|
|
for (Waiter& waiter : remaining) waiters.push_back(std::move(waiter));
|
|
}
|
|
|
|
void RecordTraces(Clock::time_point now, std::uint64_t current) {
|
|
for (auto it = traces.begin(); it != traces.end();) {
|
|
TraceRun& run = *it;
|
|
run.frames.push_back(current);
|
|
for (std::size_t i = 0; i < run.paths.size(); ++i) {
|
|
const auto value = ResolvePath(run.paths[i]);
|
|
run.series[i].push_back(value ? *value : Value());
|
|
}
|
|
const bool truncated = now > run.deadline;
|
|
if (--run.remaining != 0 && !truncated) {
|
|
++it;
|
|
continue;
|
|
}
|
|
Value frames = Value::MakeArray();
|
|
for (const std::uint64_t f : run.frames) frames.Push(Value(f));
|
|
Value series = Value::MakeObject();
|
|
for (std::size_t i = 0; i < run.paths.size(); ++i) {
|
|
series.Set(run.paths[i], Object({ { "values", Value::MakeArray(run.series[i]) }, { "stats", Stats(run.frames, run.series[i]) } }));
|
|
}
|
|
Value result = Object({ { "frames", std::move(frames) }, { "series", std::move(series) } });
|
|
if (truncated) result.Set("truncated", Value(true));
|
|
run.exchange->Reply(MakeReply(std::move(result)));
|
|
it = traces.erase(it);
|
|
}
|
|
}
|
|
|
|
void ExpireFollowers(Clock::time_point now) {
|
|
std::vector<std::shared_ptr<Exchange>> ended;
|
|
{
|
|
std::lock_guard lock(mutex);
|
|
for (auto it = followers.begin(); it != followers.end();) {
|
|
if (now > it->until) {
|
|
ended.push_back(it->exchange);
|
|
it = followers.erase(it);
|
|
} else {
|
|
++it;
|
|
}
|
|
}
|
|
}
|
|
for (const auto& exchange : ended) exchange->Reply(MakeReply(Object({ { "ended", Value("the follow time elapsed") } })));
|
|
}
|
|
|
|
// ---- every timeline entry, on the thread that recorded it ----
|
|
|
|
void OnEntry(const TimelineEntry& entry) {
|
|
if (entry.kind == EntryKind::Check) {
|
|
bool trigger = false;
|
|
bool trap = false;
|
|
{
|
|
std::lock_guard lock(mutex);
|
|
if (armedOnCheck) {
|
|
armedOnCheck = false;
|
|
trigger = true;
|
|
trap = armedTrap;
|
|
}
|
|
}
|
|
if (trigger) PauseNow(std::format("check failed at {}:{}: {}", FileName(entry.file), entry.line, entry.message), trap);
|
|
}
|
|
if (entry.kind == EntryKind::Event) {
|
|
std::vector<std::shared_ptr<Exchange>> matched;
|
|
{
|
|
std::lock_guard lock(mutex);
|
|
for (auto it = waiters.begin(); it != waiters.end();) {
|
|
if (it->kind == WaitKind::Event && it->event == entry.category) {
|
|
matched.push_back(it->exchange);
|
|
it = waiters.erase(it);
|
|
} else {
|
|
++it;
|
|
}
|
|
}
|
|
}
|
|
for (const auto& exchange : matched) {
|
|
exchange->Reply(MakeReply(Object({ { "frame", Value(entry.frame) }, { "event", Value(entry.category) }, { "payload", entry.payload } })));
|
|
}
|
|
}
|
|
if (entry.sequence == 0) return;
|
|
std::lock_guard lock(mutex);
|
|
std::erase_if(followers, [&](Follower& follower) {
|
|
if (!Detail::Matches(follower.query, entry)) return false;
|
|
return !follower.exchange->Stream(Object({ { "entry", EntryValue(entry) } }));
|
|
});
|
|
}
|
|
|
|
// ---- the end, on the thread destroying the Session ----
|
|
|
|
void Shutdown() {
|
|
Detail::Timeline::Instance().SetListener(nullptr);
|
|
std::deque<Job> queued;
|
|
std::vector<Waiter> waiting;
|
|
std::vector<Follower> following;
|
|
{
|
|
std::lock_guard lock(mutex);
|
|
shutDown = true;
|
|
queued.swap(jobs);
|
|
waiting.swap(waiters);
|
|
following.swap(followers);
|
|
}
|
|
const Value goodbye = MakeErrorReply(Codes::shuttingDown, "the app is shutting down");
|
|
for (const Job& job : queued) job.exchange->Reply(goodbye);
|
|
for (const Waiter& waiter : waiting) waiter.exchange->Reply(goodbye);
|
|
for (const Follower& follower : following) follower.exchange->Reply(goodbye);
|
|
for (const Pending& pending : pendings) pending.exchange->Reply(goodbye);
|
|
for (const TraceRun& run : traces) run.exchange->Reply(goodbye);
|
|
pendings.clear();
|
|
traces.clear();
|
|
builtins.reset();
|
|
}
|
|
};
|
|
}
|
|
|
|
Session::Session(SessionOptions options) : state(std::make_shared<State>(std::move(options))) {
|
|
State* expected = nullptr;
|
|
if (!current.compare_exchange_strong(expected, state.get())) {
|
|
throw std::logic_error("Crafter.Debug: a Session already exists; there is one per process");
|
|
}
|
|
try {
|
|
state->Start();
|
|
std::weak_ptr<State> weak = state;
|
|
Detail::Timeline::Instance().SetListener([weak](const TimelineEntry& entry) {
|
|
if (const std::shared_ptr<State> alive = weak.lock()) alive->OnEntry(entry);
|
|
});
|
|
// A debugger the agent starts is never this process's ancestor,
|
|
// which Yama's ptrace_scope 1 would otherwise require.
|
|
::prctl(PR_SET_PTRACER, PR_SET_PTRACER_ANY, 0, 0, 0);
|
|
} catch (...) {
|
|
current.store(nullptr);
|
|
throw;
|
|
}
|
|
}
|
|
|
|
Session::~Session() {
|
|
state->Shutdown();
|
|
current.store(nullptr);
|
|
}
|
|
|
|
void Session::Handle(const Value& request, std::shared_ptr<Detail::Exchange> exchange) {
|
|
state->Handle(request, exchange);
|
|
}
|
|
|
|
const std::string& Session::Token() const {
|
|
return state->token;
|
|
}
|
|
|
|
void Crafter::Debug::Pump() {
|
|
if (Session::State* session = current.load()) session->Pump();
|
|
}
|
|
|
|
bool Crafter::Debug::Advance() {
|
|
Session::State* session = current.load();
|
|
if (session == nullptr) return true;
|
|
session->pauseSupported.store(true, std::memory_order_relaxed);
|
|
if (!session->paused.load()) return true;
|
|
std::uint32_t available = session->steps.load();
|
|
while (available > 0) {
|
|
if (session->steps.compare_exchange_weak(available, available - 1)) return true;
|
|
}
|
|
return false;
|
|
}
|
|
|
|
bool Crafter::Debug::Paused() {
|
|
Session::State* session = current.load();
|
|
if (session == nullptr) return false;
|
|
session->pauseSupported.store(true, std::memory_order_relaxed);
|
|
return session->paused.load();
|
|
}
|
|
|
|
std::uint32_t Crafter::Debug::TakeSteps() {
|
|
Session::State* session = current.load();
|
|
if (session == nullptr) return 0;
|
|
session->pauseSupported.store(true, std::memory_order_relaxed);
|
|
return session->steps.exchange(0);
|
|
}
|
|
|
|
bool Crafter::Debug::QuitRequested() {
|
|
Session::State* session = current.load();
|
|
return session != nullptr && session->quitRequested.load();
|
|
}
|
|
|
|
void Crafter::Debug::SetCapture(std::function<Async<std::vector<std::byte>>()> capture) {
|
|
std::lock_guard lock(captureMutex);
|
|
captureSource = std::move(capture);
|
|
}
|