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@ -1,5 +1,16 @@
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///! daemon watches network status and communicates updates to the gui
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///! using uiwriter
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//! daemon watches network status and communicates updates to the GUI using uiwriter.
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//! public fields are allocator
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//! usage example:
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//!
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//! var ctrl = try nif.wpa.Control.open("/run/wpa_supplicant/wlan0");
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//! defer ctrl.close() catch {};
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//! var nd: Daemon = .{
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//! .allocator = gpa,
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//! .uiwriter = ngui_stdio_writer,
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//! .wpa_ctrl = ctrl,
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//! };
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//! try nd.start();
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const std = @import("std");
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const mem = std.mem;
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const time = std.time;
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@ -8,41 +19,137 @@ const nif = @import("nif");
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const comm = @import("../comm.zig");
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const screen = @import("../ui/screen.zig");
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const types = @import("../types.zig");
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const SysService = @import("SysService.zig");
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const logger = std.log.scoped(.netmon);
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// pub fields
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allocator: mem.Allocator,
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uiwriter: std.fs.File.Writer, // ngui stdin
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wpa_ctrl: nif.wpa.Control, // guarded by mu once start'ed
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wpa_ctrl: types.WpaControl, // guarded by mu once start'ed
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// private fields
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/// guards all the fields below to sync between pub fns and main/poweroff threads.
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mu: std.Thread.Mutex = .{},
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quit: bool = false, // tells daemon to quit
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main_thread: ?std.Thread = null, // non-nill if started
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want_report: bool = false,
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/// daemon state
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state: enum {
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stopped,
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running,
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poweroff,
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},
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main_thread: ?std.Thread = null,
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poweroff_thread: ?std.Thread = null,
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want_stop: bool = false, // tells daemon main loop to quit
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want_network_report: bool = false,
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want_wifi_scan: bool = false,
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wifi_scan_in_progress: bool = false,
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report_ready: bool = true, // no need to scan for an immediate report
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network_report_ready: bool = true, // no need to scan for an immediate report
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wpa_save_config_on_connected: bool = false,
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/// system services actively managed by the daemon.
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/// these are stop'ed during poweroff and their shutdown progress sent to ngui.
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/// initialized in start and never modified again: ok to access without holding self.mu.
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services: []SysService = &.{},
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const Daemon = @This();
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/// callers must deinit when done.
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pub fn init(a: std.mem.Allocator, iogui: std.fs.File.Writer, wpa_path: [:0]const u8) !Daemon {
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var svlist = std.ArrayList(SysService).init(a);
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errdefer {
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for (svlist.items) |*sv| sv.deinit();
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svlist.deinit();
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}
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// the order is important. when powering off, the services are shut down
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// in the same order appended here.
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try svlist.append(SysService.init(a, "lnd", .{ .stop_wait_sec = 600 }));
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try svlist.append(SysService.init(a, "bitcoind", .{ .stop_wait_sec = 600 }));
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return .{
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.allocator = a,
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.uiwriter = iogui,
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.wpa_ctrl = try types.WpaControl.open(wpa_path),
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.state = .stopped,
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.services = svlist.toOwnedSlice(),
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};
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}
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/// releases all associated resources.
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/// if the daemon is not in a stopped or poweroff mode, deinit panics.
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pub fn deinit(self: *Daemon) void {
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self.mu.lock();
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defer self.mu.unlock();
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switch (self.state) {
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.stopped, .poweroff => if (self.want_stop) {
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@panic("deinit while stopping");
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},
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else => @panic("deinit while running"),
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}
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self.wpa_ctrl.close() catch |err| logger.err("deinit: wpa_ctrl.close: {any}", .{err});
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for (self.services) |*sv| {
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sv.deinit();
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}
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self.allocator.free(self.services);
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}
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/// start launches a main thread and returns immediately.
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/// once started, the daemon must be eventually stop'ed to clean up resources
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/// even if a poweroff sequence is launched with beginPoweroff. however, in the latter
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/// case the daemon cannot be start'ed again after stop.
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pub fn start(self: *Daemon) !void {
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// TODO: return error if already started
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self.mu.lock();
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defer self.mu.unlock();
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switch (self.state) {
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.running => return error.AlreadyStarted,
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.poweroff => return error.InPoweroffState,
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.stopped => {}, // continue
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}
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try self.wpa_ctrl.attach();
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self.main_thread = try std.Thread.spawn(.{}, mainThreadLoop, .{self});
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self.state = .running;
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}
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/// stop blocks until all daemon threads exit, including poweroff if any.
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/// once stopped, the daemon can be start'ed again unless a poweroff was initiated.
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///
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/// note: stop leaves system services like lnd and bitcoind running.
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pub fn stop(self: *Daemon) void {
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self.mu.lock();
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self.quit = true;
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if (self.want_stop or self.state == .stopped) {
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self.mu.unlock();
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return; // already in progress or stopped
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}
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self.want_stop = true;
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self.mu.unlock(); // avoid threads deadlock
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if (self.main_thread) |th| {
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th.join();
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self.main_thread = null;
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}
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// must be the last one to join because it sends a final poweroff report.
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if (self.poweroff_thread) |th| {
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th.join();
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self.poweroff_thread = null;
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}
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self.mu.lock();
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defer self.mu.unlock();
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self.want_stop = false;
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if (self.state != .poweroff) { // keep poweroff to prevent start'ing again
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self.state = .stopped;
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}
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self.wpa_ctrl.detach() catch |err| logger.err("stop: wpa_ctrl.detach: {any}", .{err});
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}
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pub fn standby(_: *Daemon) !void {
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pub fn standby(self: *Daemon) !void {
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self.mu.lock();
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defer self.mu.unlock();
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switch (self.state) {
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.poweroff => return error.InPoweroffState,
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.running, .stopped => {}, // continue
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}
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try screen.backlight(.off);
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}
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@ -50,27 +157,72 @@ pub fn wakeup(_: *Daemon) !void {
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try screen.backlight(.on);
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}
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/// initiates system poweroff sequence in a separate thread: shut down select
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/// system services such as lnd and bitcoind, and issue "poweroff" command.
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///
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/// in the poweroff mode, the daemon is still running as usual and must be stop'ed.
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/// however, in poweroff mode regular functionalities are disabled, such as
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/// wifi scan and standby.
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pub fn beginPoweroff(self: *Daemon) !void {
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self.mu.lock();
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defer self.mu.unlock();
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if (self.state == .poweroff) {
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return; // already in poweroff state
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}
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self.poweroff_thread = try std.Thread.spawn(.{}, poweroffThread, .{self});
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self.state = .poweroff;
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}
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// stops all monitored services and issue poweroff command while reporting
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// the progress to ngui.
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fn poweroffThread(self: *Daemon) !void {
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logger.info("begin powering off", .{});
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screen.backlight(.on) catch |err| {
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logger.err("screen.backlight(.on) during poweroff: {any}", .{err});
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};
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self.wpa_ctrl.detach() catch {}; // don't care because powering off anyway
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// initiate shutdown of all services concurrently.
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for (self.services) |*sv| {
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sv.stop() catch |err| logger.err("sv stop '{s}': {any}", .{ sv.name, err });
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}
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self.sendPoweroffReport() catch |err| logger.err("sendPoweroffReport: {any}", .{err});
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// wait each service until stopped or error.
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for (self.services) |*sv| {
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_ = sv.stopWait() catch {};
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logger.info("{s} sv is now stopped; err={any}", .{ sv.name, sv.lastStopError() });
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self.sendPoweroffReport() catch |err| logger.err("sendPoweroffReport: {any}", .{err});
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}
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// finally, initiate system shutdown and power it off.
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var off = types.ChildProcess.init(&.{"poweroff"}, self.allocator);
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const res = off.spawnAndWait();
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logger.info("poweroff: {any}", .{res});
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}
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/// main thread entry point.
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fn mainThreadLoop(self: *Daemon) !void {
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try self.wpa_ctrl.attach();
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defer self.wpa_ctrl.detach() catch |err| logger.err("wpa_ctrl.detach failed on exit: {any}", .{err});
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while (true) {
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var quit = false;
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while (!quit) {
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self.mainThreadLoopCycle() catch |err| logger.err("main thread loop: {any}", .{err});
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time.sleep(1 * time.ns_per_s);
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self.mainThreadLoopCycle();
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self.mu.lock();
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const do_quit = self.quit;
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quit = self.want_stop;
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self.mu.unlock();
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if (do_quit) {
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break;
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}
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}
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}
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/// run one cycle of the main thread loop iteration.
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/// holds self.mu for the whole duration.
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fn mainThreadLoopCycle(self: *Daemon) void {
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/// unless in poweroff mode, the cycle holds self.mu for the whole duration.
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fn mainThreadLoopCycle(self: *Daemon) !void {
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switch (self.state) {
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// poweroff mode: do nothing; handled by poweroffThread
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.poweroff => {},
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// normal state: running or standby
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else => {
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self.mu.lock();
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defer self.mu.unlock();
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self.readWPACtrlMsg() catch |err| logger.err("readWPACtrlMsg: {any}", .{err});
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@ -81,27 +233,43 @@ fn mainThreadLoopCycle(self: *Daemon) void {
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logger.err("startWifiScan: {any}", .{err});
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}
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}
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if (self.want_report and self.report_ready) {
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if (self.want_network_report and self.network_report_ready) {
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if (self.sendNetworkReport()) {
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self.want_report = false;
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self.want_network_report = false;
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} else |err| {
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logger.err("sendNetworkReport: {any}", .{err});
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}
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}
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},
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}
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}
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fn sendPoweroffReport(self: *Daemon) !void {
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var svstat = try self.allocator.alloc(comm.Message.PoweroffProgress.Service, self.services.len);
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defer self.allocator.free(svstat);
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for (self.services) |*sv, i| {
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svstat[i] = .{
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.name = sv.name,
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.stopped = sv.status() == .stopped,
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.err = if (sv.lastStopError()) |err| @errorName(err) else null,
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};
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}
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const report = comm.Message{ .poweroff_progress = .{ .services = svstat } };
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try comm.write(self.allocator, self.uiwriter, report);
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}
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/// caller must hold self.mu.
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fn startWifiScan(self: *Daemon) !void {
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try self.wpa_ctrl.scan();
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self.wifi_scan_in_progress = true;
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self.report_ready = false;
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self.network_report_ready = false;
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}
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/// invoked when CTRL-EVENT-SCAN-RESULTS event is seen.
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/// caller must hold self.mu.
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fn wifiScanComplete(self: *Daemon) void {
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self.wifi_scan_in_progress = false;
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self.report_ready = true;
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self.network_report_ready = true;
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}
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/// invoked when CTRL-EVENT-CONNECTED event is seen.
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@ -117,15 +285,15 @@ fn wifiConnected(self: *Daemon) void {
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}
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}
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// always send a network report when connected
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self.want_report = true;
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self.want_network_report = true;
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}
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/// invoked when CTRL-EVENT-SSID-TEMP-DISABLED event with authentication failures is seen.
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/// caller must hold self.mu.
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fn wifiInvalidKey(self: *Daemon) void {
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self.wpa_save_config_on_connected = false;
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self.want_report = true;
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self.report_ready = true;
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self.want_network_report = true;
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self.network_report_ready = true;
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}
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pub const ReportNetworkStatusOpt = struct {
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@ -135,10 +303,10 @@ pub const ReportNetworkStatusOpt = struct {
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pub fn reportNetworkStatus(self: *Daemon, opt: ReportNetworkStatusOpt) void {
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self.mu.lock();
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defer self.mu.unlock();
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self.want_report = true;
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self.want_network_report = true;
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self.want_wifi_scan = opt.scan and !self.wifi_scan_in_progress;
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if (self.want_wifi_scan and self.report_ready) {
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self.report_ready = false;
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if (self.want_wifi_scan and self.network_report_ready) {
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self.network_report_ready = false;
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}
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}
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@ -160,7 +328,7 @@ fn connectWifiThread(self: *Daemon, ssid: []const u8, password: []const u8) void
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// https://hostap.epitest.fi/wpa_supplicant/devel/ctrl_iface_page.html
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// https://wiki.archlinux.org/title/WPA_supplicant
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// unfortunately, this prevents main thread from looping until released.
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// this prevents main thread from looping until released,
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// but the following commands and expected to be pretty quick.
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self.mu.lock();
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defer self.mu.unlock();
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@ -305,6 +473,7 @@ fn sendNetworkReport(self: *Daemon) !void {
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return comm.write(self.allocator, self.uiwriter, comm.Message{ .network_report = report });
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}
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/// caller must hold self.mu.
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fn queryWifiSSID(self: *Daemon) !?[]const u8 {
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var buf: [512:0]u8 = undefined;
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const resp = try self.wpa_ctrl.request("STATUS", &buf, null);
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@ -320,7 +489,8 @@ fn queryWifiSSID(self: *Daemon) !?[]const u8 {
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return null;
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}
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/// callers must free with StringList.deinit.
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/// caller must hold self.mu.
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/// the retuned value must free'd with StringList.deinit.
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fn queryWifiScanResults(self: *Daemon) !StringList {
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var buf: [8192:0]u8 = undefined; // TODO: what if isn't enough?
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// first line is banner: "bssid / frequency / signal level / flags / ssid"
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@ -352,7 +522,8 @@ const WifiNetworksListFilter = struct {
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ssid: ?[]const u8, // ignore networks whose ssid doesn't match
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};
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/// caller must release results with allocator.free.
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/// caller must hold self.mu.
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|
/// the returned value must be free'd with self.allocator.
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|
fn queryWifiNetworksList(self: *Daemon, filter: WifiNetworksListFilter) ![]u32 {
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|
var buf: [8192:0]u8 = undefined; // TODO: is this enough?
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|
// first line is banner: "network id / ssid / bssid / flags"
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@ -407,3 +578,83 @@ const StringList = struct {
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|
return self.l.items;
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|
}
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|
};
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|
test "start-stop" {
|
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|
|
const t = std.testing;
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|
const pipe = try types.IoPipe.create();
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|
|
defer pipe.close();
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|
|
var daemon = try Daemon.init(t.allocator, pipe.writer(), "/dev/null");
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|
try t.expect(daemon.state == .stopped);
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|
try daemon.start();
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|
try t.expect(daemon.state == .running);
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|
try t.expect(daemon.wpa_ctrl.opened);
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|
|
try t.expect(daemon.wpa_ctrl.attached);
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|
daemon.stop();
|
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|
|
|
try t.expect(daemon.state == .stopped);
|
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|
|
|
try t.expect(!daemon.want_stop);
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|
|
try t.expect(!daemon.wpa_ctrl.attached);
|
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|
|
|
try t.expect(daemon.wpa_ctrl.opened);
|
|
|
|
|
try t.expect(daemon.main_thread == null);
|
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|
|
|
try t.expect(daemon.poweroff_thread == null);
|
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|
|
|
|
|
|
|
|
try t.expect(daemon.services.len > 0);
|
|
|
|
|
for (daemon.services) |*sv| {
|
|
|
|
|
try t.expect(!sv.stop_proc.spawned);
|
|
|
|
|
try t.expectEqual(SysService.Status.initial, sv.status());
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
daemon.deinit();
|
|
|
|
|
try t.expect(!daemon.wpa_ctrl.opened);
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
test "start-poweroff-stop" {
|
|
|
|
|
const t = std.testing;
|
|
|
|
|
const tt = @import("../test.zig");
|
|
|
|
|
|
|
|
|
|
var arena_alloc = std.heap.ArenaAllocator.init(t.allocator);
|
|
|
|
|
defer arena_alloc.deinit();
|
|
|
|
|
const arena = arena_alloc.allocator();
|
|
|
|
|
|
|
|
|
|
const pipe = try types.IoPipe.create();
|
|
|
|
|
var daemon = try Daemon.init(arena, pipe.writer(), "/dev/null");
|
|
|
|
|
defer {
|
|
|
|
|
daemon.deinit();
|
|
|
|
|
pipe.close();
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
try daemon.start();
|
|
|
|
|
try daemon.beginPoweroff();
|
|
|
|
|
daemon.stop();
|
|
|
|
|
try t.expect(daemon.state == .poweroff);
|
|
|
|
|
for (daemon.services) |*sv| {
|
|
|
|
|
try t.expect(sv.stop_proc.spawned);
|
|
|
|
|
try t.expect(sv.stop_proc.waited);
|
|
|
|
|
try t.expectEqual(SysService.Status.stopped, sv.status());
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
const pipe_reader = pipe.reader();
|
|
|
|
|
const msg1 = try comm.read(arena, pipe_reader);
|
|
|
|
|
try tt.expectDeepEqual(comm.Message{ .poweroff_progress = .{ .services = &.{
|
|
|
|
|
.{ .name = "lnd", .stopped = false, .err = null },
|
|
|
|
|
.{ .name = "bitcoind", .stopped = false, .err = null },
|
|
|
|
|
} } }, msg1);
|
|
|
|
|
|
|
|
|
|
const msg2 = try comm.read(arena, pipe_reader);
|
|
|
|
|
try tt.expectDeepEqual(comm.Message{ .poweroff_progress = .{ .services = &.{
|
|
|
|
|
.{ .name = "lnd", .stopped = true, .err = null },
|
|
|
|
|
.{ .name = "bitcoind", .stopped = false, .err = null },
|
|
|
|
|
} } }, msg2);
|
|
|
|
|
|
|
|
|
|
const msg3 = try comm.read(arena, pipe_reader);
|
|
|
|
|
try tt.expectDeepEqual(comm.Message{ .poweroff_progress = .{ .services = &.{
|
|
|
|
|
.{ .name = "lnd", .stopped = true, .err = null },
|
|
|
|
|
.{ .name = "bitcoind", .stopped = true, .err = null },
|
|
|
|
|
} } }, msg3);
|
|
|
|
|
|
|
|
|
|
// TODO: ensure "poweroff" was executed once custom runner is in a zig release;
|
|
|
|
|
// need custom runner to set up a global registry for child processes.
|
|
|
|
|
// https://github.com/ziglang/zig/pull/13411
|
|
|
|
|
}
|
|
|
|
|
|