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feat(queen): enhance PID file with heartbeat tracking + JSON state #543

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gHashTag merged 1 commit into from
Apr 29, 2026
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feat(queen): enhance PID file with heartbeat tracking + JSON state #543

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102 changes: 87 additions & 15 deletions src/tri/queen.zig
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Original file line number Diff line number Diff line change
Expand Up @@ -861,6 +861,13 @@ const SupervisorConfig = struct {
// PID FILE MANAGEMENT
// ═══════════════════════════════════════════════════════════════════════════════

const SupervisorPidState = struct {
pid: i32,
started_at: i64,
heartbeat: i64,
restart_count: u32,
};

fn writePidFile() !void {
const pid = std.posix.getpid();
const dir = std.fs.cwd().makeOpenPath(".trinity/queen", .{}) catch |err| {
Expand All @@ -869,31 +876,85 @@ fn writePidFile() !void {
};
defer dir.close();

const now = std.time.timestamp();
var file = try dir.createFile("supervisor.pid", .{ .truncate = true });
defer file.close();
var buf: [32]u8 = undefined;
const pid_str = std.fmt.bufPrint(&buf, "{d}", .{pid}) catch return error.InvalidPid;
try file.writeAll(pid_str);
var buf: [256]u8 = undefined;
const json = std.fmt.bufPrint(&buf,
\\{{"pid":{d},"started_at":{d},"heartbeat":{d},"restart_count":0}}
, .{ pid, now, now }) catch return error.InvalidPid;
try file.writeAll(json);
}

fn removePidFile() void {
std.fs.cwd().deleteFile(qt.SUPERVISOR_PID_PATH) catch {};
fn updateHeartbeat() void {
const dir = std.fs.cwd().openDir(".trinity/queen", .{}) catch return;
defer dir.close();
var file = dir.openFile("supervisor.pid", .{ .mode = .read_write }) catch return;
defer file.close();

var read_buf: [256]u8 = undefined;
const n = file.readAll(&read_buf) catch return;
const content = read_buf[0..n];

var pid: i32 = 0;
var started_at: i64 = 0;
var restart_count: u32 = 0;
var parser = std.mem.splitSequence(u8, content[1 .. content.len - 1], ",");
while (parser.next()) |pair| {
var kv = std.mem.splitSequence(u8, pair, ":");
const key = std.mem.trim(u8, kv.first(), " \"");
const val = kv.next() orelse continue;
if (std.mem.eql(u8, key, "pid")) pid = std.fmt.parseInt(i32, val, 10) catch 0;
if (std.mem.eql(u8, key, "started_at")) started_at = std.fmt.parseInt(i64, val, 10) catch 0;
if (std.mem.eql(u8, key, "restart_count")) restart_count = std.fmt.parseInt(u32, val, 10) catch 0;
}

const now = std.time.timestamp();
var buf: [256]u8 = undefined;
const json = std.fmt.bufPrint(&buf,
\\{{"pid":{d},"started_at":{d},"heartbeat":{d},"restart_count":{d}}}
, .{ pid, started_at, now, restart_count }) catch return;
file.seekTo(0) catch return;
file.setEndPos(0) catch return;
file.writeAll(json) catch return;
}

fn isSupervisorRunning() bool {
const file = std.fs.cwd().openFile(qt.SUPERVISOR_PID_PATH, .{}) catch return false;
fn readPidState() ?SupervisorPidState {
const file = std.fs.cwd().openFile(qt.SUPERVISOR_PID_PATH, .{}) catch return null;
defer file.close();

var buf: [32]u8 = undefined;
const n = file.read(&buf) catch return false;
if (n == 0) return false;
var buf: [256]u8 = undefined;
const n = file.readAll(&buf) catch return null;
const content = buf[0..n];

if (content.len > 0 and content[0] == '{') {
var state = SupervisorPidState{ .pid = 0, .started_at = 0, .heartbeat = 0, .restart_count = 0 };
var parser = std.mem.splitSequence(u8, content[1 .. content.len - 1], ",");
while (parser.next()) |pair| {
var kv = std.mem.splitSequence(u8, pair, ":");
const key = std.mem.trim(u8, kv.first(), " \"");
const val = kv.next() orelse continue;
if (std.mem.eql(u8, key, "pid")) state.pid = std.fmt.parseInt(i32, val, 10) catch 0;
if (std.mem.eql(u8, key, "started_at")) state.started_at = std.fmt.parseInt(i64, val, 10) catch 0;
if (std.mem.eql(u8, key, "heartbeat")) state.heartbeat = std.fmt.parseInt(i64, val, 10) catch 0;
if (std.mem.eql(u8, key, "restart_count")) state.restart_count = std.fmt.parseInt(u32, val, 10) catch 0;
}
return state;
}

const pid_str = buf[0..n];
const pid = std.fmt.parseInt(i32, pid_str, 10) catch return false;
// Legacy: plain PID number
const pid = std.fmt.parseInt(i32, content, 10) catch return null;
return SupervisorPidState{ .pid = pid, .started_at = 0, .heartbeat = 0, .restart_count = 0 };
}

// Check if process is running by sending signal 0
// Returns void on success (process exists), error on failure
std.posix.kill(pid, 0) catch return false;
fn removePidFile() void {
std.fs.cwd().deleteFile(qt.SUPERVISOR_PID_PATH) catch {};
}

fn isSupervisorRunning() bool {
const state = readPidState() orelse return false;
if (state.pid == 0) return false;
std.posix.kill(state.pid, 0) catch return false;
return true;
}

Expand Down Expand Up @@ -1667,9 +1728,19 @@ fn showStatus(allocator: Allocator) !void {
const hours = @divTrunc(uptime, 3600);
const minutes = @divTrunc(@mod(uptime, 3600), 60);

var heartbeat_str: []const u8 = "N/A";
var hb_buf: [64]u8 = undefined;
if (readPidState()) |pid_state| {
if (pid_state.heartbeat > 0) {
const hb_age = std.time.timestamp() - pid_state.heartbeat;
heartbeat_str = std.fmt.bufPrint(&hb_buf, "{d}s ago", .{hb_age}) catch "N/A";
}
}

print("\n{s}" ++ qt.E_CROWN ++ " Queen v2 Status{s}\n\n" ++
" Cycle: {d}\n" ++
" Uptime: {d}h {d}m\n" ++
" Heartbeat: {s}\n" ++
" Build: {s}{s}{s}\n" ++
" Dirty: {d}\n" ++
" Issues: {d}\n" ++
Expand All @@ -1686,6 +1757,7 @@ fn showStatus(allocator: Allocator) !void {
state.cycle,
hours,
minutes,
heartbeat_str,
if (snap.build_ok) GREEN else RED,
if (snap.build_ok) "OK" else "FAIL",
RESET,
Expand Down
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