feat: add nightwatch module
This commit is contained in:
commit
8ffcb0e732
GPG key ID:
8EB1E1BB660E3FB9
1 changed files with 476 additions and 0 deletions
476
src/nightwatch.zig
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476
src/nightwatch.zig
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const std = @import("std");
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const tp = @import("thespian");
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const cbor = @import("cbor");
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const log = @import("log");
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const builtin = @import("builtin");
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pid: tp.pid_ref,
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const Self = @This();
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const module_name = @typeName(Self);
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pub const EventType = enum {
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created,
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modified,
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deleted,
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renamed,
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};
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pub const Error = FileWatcherError;
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pub const FileWatcherError = error{ FileWatcherFailed, ThespianSpawnFailed, OutOfMemory };
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const SpawnError = error{ OutOfMemory, ThespianSpawnFailed };
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/// Watch a path (file or directory) for changes. The caller will receive:
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/// .{ "FW", "change", path, event_type }
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/// where event_type is a file_watcher.EventType tag string: "created", "modified", "deleted", "renamed"
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pub fn watch(path: []const u8) FileWatcherError!void {
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return send(.{ "watch", path });
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}
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/// Stop watching a previously watched path.
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pub fn unwatch(path: []const u8) FileWatcherError!void {
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return send(.{ "unwatch", path });
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}
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pub fn start() SpawnError!void {
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_ = try get();
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}
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pub fn shutdown() void {
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const pid = tp.env.get().proc(module_name);
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if (pid.expired()) return;
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pid.send(.{"shutdown"}) catch {};
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}
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fn get() SpawnError!Self {
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const pid = tp.env.get().proc(module_name);
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return if (pid.expired()) create() else .{ .pid = pid };
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}
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fn send(message: anytype) FileWatcherError!void {
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return (try get()).pid.send(message) catch error.FileWatcherFailed;
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}
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fn create() SpawnError!Self {
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const pid = try Process.create();
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defer pid.deinit();
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tp.env.get().proc_set(module_name, pid.ref());
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return .{ .pid = tp.env.get().proc(module_name) };
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}
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const Backend = switch (builtin.os.tag) {
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.linux => LinuxBackend,
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.macos => MacosBackend,
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.windows => WindowsBackend,
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else => @compileError("file_watcher: unsupported OS"),
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};
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const LinuxBackend = struct {
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inotify_fd: std.posix.fd_t,
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fd_watcher: tp.file_descriptor,
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watches: std.AutoHashMapUnmanaged(i32, []u8), // wd -> owned path
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const IN = std.os.linux.IN;
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const watch_mask: u32 = IN.CREATE | IN.DELETE | IN.MODIFY |
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IN.MOVED_FROM | IN.MOVED_TO | IN.DELETE_SELF |
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IN.MOVE_SELF | IN.CLOSE_WRITE;
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const in_flags: std.os.linux.O = .{ .NONBLOCK = true };
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fn init() !LinuxBackend {
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const ifd = std.posix.inotify_init1(@bitCast(in_flags)) catch return error.FileWatcherFailed;
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errdefer std.posix.close(ifd);
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const fwd = tp.file_descriptor.init(module_name, ifd) catch return error.FileWatcherFailed;
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return .{ .inotify_fd = ifd, .fd_watcher = fwd, .watches = .empty };
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}
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fn deinit(self: *LinuxBackend, allocator: std.mem.Allocator) void {
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self.fd_watcher.deinit();
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var it = self.watches.iterator();
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while (it.next()) |entry| allocator.free(entry.value_ptr.*);
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self.watches.deinit(allocator);
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std.posix.close(self.inotify_fd);
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}
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fn arm(self: *LinuxBackend) void {
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self.fd_watcher.wait_read() catch {};
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}
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fn add_watch(self: *LinuxBackend, allocator: std.mem.Allocator, path: []const u8) !void {
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const path_z = try allocator.dupeZ(u8, path);
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defer allocator.free(path_z);
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const wd = std.os.linux.inotify_add_watch(self.inotify_fd, path_z, watch_mask);
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if (wd < 0) return error.FileWatcherFailed;
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const owned_path = try allocator.dupe(u8, path);
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errdefer allocator.free(owned_path);
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const result = try self.watches.getOrPut(allocator, @intCast(wd));
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if (result.found_existing) allocator.free(result.value_ptr.*);
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result.value_ptr.* = owned_path;
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}
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fn remove_watch(self: *LinuxBackend, allocator: std.mem.Allocator, path: []const u8) void {
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var it = self.watches.iterator();
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while (it.next()) |entry| {
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if (!std.mem.eql(u8, entry.value_ptr.*, path)) continue;
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_ = std.os.linux.inotify_rm_watch(self.inotify_fd, entry.key_ptr.*);
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allocator.free(entry.value_ptr.*);
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self.watches.removeByPtr(entry.key_ptr);
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return;
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}
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}
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fn drain(self: *LinuxBackend, parent: tp.pid_ref) !void {
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const InotifyEvent = extern struct {
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wd: i32,
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mask: u32,
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cookie: u32,
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len: u32,
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};
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var buf: [4096]u8 align(@alignOf(InotifyEvent)) = undefined;
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while (true) {
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const n = std.posix.read(self.inotify_fd, &buf) catch |e| switch (e) {
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error.WouldBlock => return,
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else => return e,
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};
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var offset: usize = 0;
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while (offset + @sizeOf(InotifyEvent) <= n) {
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const ev: *const InotifyEvent = @ptrCast(@alignCast(buf[offset..].ptr));
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const name_offset = offset + @sizeOf(InotifyEvent);
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offset = name_offset + ev.len;
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const watched_path = self.watches.get(ev.wd) orelse continue;
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const name: []const u8 = if (ev.len > 0)
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std.mem.sliceTo(buf[name_offset..][0..ev.len], 0)
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else
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"";
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const event_type: EventType = if (ev.mask & IN.CREATE != 0)
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.created
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else if (ev.mask & (IN.DELETE | IN.DELETE_SELF) != 0)
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.deleted
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else if (ev.mask & (IN.MODIFY | IN.CLOSE_WRITE) != 0)
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.modified
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else if (ev.mask & (IN.MOVED_FROM | IN.MOVED_TO | IN.MOVE_SELF) != 0)
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.renamed
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else
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continue;
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if (name.len > 0) {
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var full_buf: [std.fs.max_path_bytes]u8 = undefined;
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const full_path = try std.fmt.bufPrint(&full_buf, "{s}/{s}", .{ watched_path, name });
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try parent.send(.{ "FW", "change", full_path, event_type });
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} else {
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try parent.send(.{ "FW", "change", watched_path, event_type });
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}
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}
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}
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}
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};
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const MacosBackend = struct {
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kq: std.posix.fd_t,
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fd_watcher: tp.file_descriptor,
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watches: std.StringHashMapUnmanaged(std.posix.fd_t), // owned path -> fd
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const EVFILT_VNODE: i16 = -4;
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const EV_ADD: u16 = 0x0001;
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const EV_ENABLE: u16 = 0x0004;
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const EV_CLEAR: u16 = 0x0020;
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const NOTE_WRITE: u32 = 0x00000002;
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const NOTE_DELETE: u32 = 0x00000004;
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const NOTE_RENAME: u32 = 0x00000020;
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const NOTE_ATTRIB: u32 = 0x00000008;
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const NOTE_EXTEND: u32 = 0x00000004;
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fn init() !MacosBackend {
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const kq = std.posix.kqueue() catch return error.FileWatcherFailed;
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errdefer std.posix.close(kq);
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const fwd = tp.file_descriptor.init(module_name, kq) catch return error.FileWatcherFailed;
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return .{ .kq = kq, .fd_watcher = fwd, .watches = .empty };
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}
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fn deinit(self: *MacosBackend, allocator: std.mem.Allocator) void {
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self.fd_watcher.deinit();
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var it = self.watches.iterator();
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while (it.next()) |entry| {
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std.posix.close(entry.value_ptr.*);
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allocator.free(entry.key_ptr.*);
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}
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self.watches.deinit(allocator);
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std.posix.close(self.kq);
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}
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fn arm(self: *MacosBackend) void {
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self.fd_watcher.wait_read() catch {};
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}
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fn add_watch(self: *MacosBackend, allocator: std.mem.Allocator, path: []const u8) !void {
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if (self.watches.contains(path)) return;
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const path_fd = std.posix.open(path, .{ .ACCMODE = .RDONLY }, 0) catch return error.FileWatcherFailed;
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errdefer std.posix.close(path_fd);
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const kev = std.posix.Kevent{
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.ident = @intCast(path_fd),
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.filter = EVFILT_VNODE,
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.flags = EV_ADD | EV_ENABLE | EV_CLEAR,
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.fflags = NOTE_WRITE | NOTE_DELETE | NOTE_RENAME | NOTE_ATTRIB | NOTE_EXTEND,
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.data = 0,
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.udata = 0,
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};
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_ = std.posix.kevent(self.kq, &.{kev}, &.{}, null) catch return error.FileWatcherFailed;
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const owned_path = try allocator.dupe(u8, path);
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errdefer allocator.free(owned_path);
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try self.watches.put(allocator, owned_path, path_fd);
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}
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fn remove_watch(self: *MacosBackend, allocator: std.mem.Allocator, path: []const u8) void {
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if (self.watches.fetchRemove(path)) |entry| {
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std.posix.close(entry.value);
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allocator.free(entry.key);
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}
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}
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fn drain(self: *MacosBackend, parent: tp.pid_ref) !void {
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var events: [64]std.posix.Kevent = undefined;
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const immediate: std.posix.timespec = .{ .sec = 0, .nsec = 0 };
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const n = std.posix.kevent(self.kq, &.{}, &events, &immediate) catch return;
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for (events[0..n]) |ev| {
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var it = self.watches.iterator();
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while (it.next()) |entry| {
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if (entry.value_ptr.* != @as(std.posix.fd_t, @intCast(ev.ident))) continue;
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const event_type: EventType = if (ev.fflags & NOTE_DELETE != 0)
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.deleted
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else if (ev.fflags & NOTE_RENAME != 0)
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.renamed
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else if (ev.fflags & (NOTE_WRITE | NOTE_EXTEND | NOTE_ATTRIB) != 0)
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.modified
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else
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continue;
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try parent.send(.{ "FW", "change", entry.key_ptr.*, event_type });
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break;
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}
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}
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}
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};
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const WindowsBackend = struct {
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const windows = std.os.windows;
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iocp: windows.HANDLE,
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poll_timer: ?tp.timeout,
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watches: std.StringHashMapUnmanaged(Watch),
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const poll_interval_ms: u64 = 50;
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const Watch = struct {
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handle: windows.HANDLE,
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buf: *align(4) [buf_size]u8,
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overlapped: windows.OVERLAPPED,
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path: []u8, // owned
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};
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const buf_size = 65536;
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const FILE_NOTIFY_INFORMATION = extern struct {
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NextEntryOffset: windows.DWORD,
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Action: windows.DWORD,
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FileNameLength: windows.DWORD,
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FileName: [1]windows.WCHAR,
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};
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const FILE_ACTION_ADDED: windows.DWORD = 1;
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const FILE_ACTION_REMOVED: windows.DWORD = 2;
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const FILE_ACTION_MODIFIED: windows.DWORD = 3;
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const FILE_ACTION_RENAMED_OLD_NAME: windows.DWORD = 4;
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const FILE_ACTION_RENAMED_NEW_NAME: windows.DWORD = 5;
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const notify_filter: windows.DWORD =
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0x00000001 | // FILE_NOTIFY_CHANGE_FILE_NAME
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0x00000002 | // FILE_NOTIFY_CHANGE_DIR_NAME
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0x00000008 | // FILE_NOTIFY_CHANGE_SIZE
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0x00000010 | // FILE_NOTIFY_CHANGE_LAST_WRITE
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0x00000040; // FILE_NOTIFY_CHANGE_CREATION
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fn init() !WindowsBackend {
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const iocp = windows.CreateIoCompletionPort(windows.INVALID_HANDLE_VALUE, null, 0, 1) catch
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return error.FileWatcherFailed;
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return .{ .iocp = iocp, .poll_timer = null, .watches = .empty };
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}
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fn deinit(self: *WindowsBackend, allocator: std.mem.Allocator) void {
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if (self.poll_timer) |*t| t.deinit();
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var it = self.watches.iterator();
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while (it.next()) |entry| {
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_ = windows.kernel32.CloseHandle(entry.value_ptr.*.handle);
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allocator.free(entry.value_ptr.*.path);
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allocator.destroy(entry.value_ptr.*.buf);
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}
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self.watches.deinit(allocator);
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_ = windows.kernel32.CloseHandle(self.iocp);
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}
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fn arm(self: *WindowsBackend) void {
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if (self.poll_timer) |*t| t.deinit();
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self.poll_timer = tp.timeout.init_ms(poll_interval_ms, tp.message.fmt(.{"FW_poll"})) catch null;
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}
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fn add_watch(self: *WindowsBackend, allocator: std.mem.Allocator, path: []const u8) !void {
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if (self.watches.contains(path)) return;
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const path_w = try std.unicode.utf8ToUtf16LeAllocZ(allocator, path);
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defer allocator.free(path_w);
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const handle = windows.kernel32.CreateFileW(
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path_w,
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windows.GENERIC_READ,
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windows.FILE_SHARE_READ | windows.FILE_SHARE_WRITE | windows.FILE_SHARE_DELETE,
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null,
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windows.OPEN_EXISTING,
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0x02000000 | 0x40000000, // FILE_FLAG_BACKUP_SEMANTICS | FILE_FLAG_OVERLAPPED
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null,
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);
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if (handle == windows.INVALID_HANDLE_VALUE) return error.FileWatcherFailed;
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errdefer _ = windows.kernel32.CloseHandle(handle);
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_ = windows.CreateIoCompletionPort(handle, self.iocp, @intFromPtr(handle), 0) catch return error.FileWatcherFailed;
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const buf = try allocator.create([buf_size]u8);
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errdefer allocator.destroy(buf);
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const owned_path = try allocator.dupe(u8, path);
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errdefer allocator.free(owned_path);
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var overlapped: windows.OVERLAPPED = std.mem.zeroes(windows.OVERLAPPED);
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if (windows.kernel32.ReadDirectoryChangesW(handle, buf, buf_size, 1, notify_filter, null, &overlapped, null) == 0)
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return error.FileWatcherFailed;
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try self.watches.put(allocator, owned_path, .{
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.handle = handle,
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.buf = buf,
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.overlapped = overlapped,
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.path = owned_path,
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});
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}
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fn remove_watch(self: *WindowsBackend, allocator: std.mem.Allocator, path: []const u8) void {
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if (self.watches.fetchRemove(path)) |entry| {
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_ = windows.kernel32.CloseHandle(entry.value.handle);
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allocator.free(entry.value.path);
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allocator.destroy(entry.value.buf);
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}
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}
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fn drain(self: *WindowsBackend, parent: tp.pid_ref) !void {
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var bytes: windows.DWORD = 0;
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var key: windows.ULONG_PTR = 0;
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var overlapped_ptr: ?*windows.OVERLAPPED = null;
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while (true) {
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const ok = windows.kernel32.GetQueuedCompletionStatus(self.iocp, &bytes, &key, &overlapped_ptr, 0);
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if (ok == 0 or overlapped_ptr == null) break;
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const triggered_handle: windows.HANDLE = @ptrFromInt(key);
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var it = self.watches.iterator();
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while (it.next()) |entry| {
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const w = entry.value_ptr;
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if (w.handle != triggered_handle) continue;
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if (bytes > 0) {
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var offset: usize = 0;
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while (offset < bytes) {
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const info: *FILE_NOTIFY_INFORMATION = @ptrCast(@alignCast(w.buf[offset..].ptr));
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const name_wchars = info.FileName[0 .. info.FileNameLength / 2];
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var name_buf: [std.fs.max_path_bytes]u8 = undefined;
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const name_len = std.unicode.utf16LeToUtf8(&name_buf, name_wchars) catch 0;
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const event_type: EventType = switch (info.Action) {
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FILE_ACTION_ADDED => .created,
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FILE_ACTION_REMOVED => .deleted,
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FILE_ACTION_MODIFIED => .modified,
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FILE_ACTION_RENAMED_OLD_NAME, FILE_ACTION_RENAMED_NEW_NAME => .renamed,
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else => {
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if (info.NextEntryOffset == 0) break;
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offset += info.NextEntryOffset;
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continue;
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},
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};
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var full_buf: [std.fs.max_path_bytes]u8 = undefined;
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const full_path = std.fmt.bufPrint(&full_buf, "{s}\\{s}", .{ w.path, name_buf[0..name_len] }) catch continue;
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try parent.send(.{ "FW", "change", full_path, event_type });
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if (info.NextEntryOffset == 0) break;
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offset += info.NextEntryOffset;
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}
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}
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// Re-arm ReadDirectoryChangesW for the next batch.
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w.overlapped = std.mem.zeroes(windows.OVERLAPPED);
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_ = windows.kernel32.ReadDirectoryChangesW(w.handle, w.buf, buf_size, 1, notify_filter, null, &w.overlapped, null);
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break;
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}
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}
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||||
}
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};
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const Process = struct {
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||||
allocator: std.mem.Allocator,
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||||
parent: tp.pid,
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||||
logger: log.Logger,
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||||
receiver: Receiver,
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||||
backend: Backend,
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||||
|
||||
const Receiver = tp.Receiver(*Process);
|
||||
|
||||
fn create() SpawnError!tp.pid {
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const allocator = std.heap.c_allocator;
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||||
const self = try allocator.create(Process);
|
||||
errdefer allocator.destroy(self);
|
||||
self.* = .{
|
||||
.allocator = allocator,
|
||||
.parent = tp.self_pid().clone(),
|
||||
.logger = log.logger(module_name),
|
||||
.receiver = Receiver.init(Process.receive, self),
|
||||
.backend = undefined,
|
||||
};
|
||||
return tp.spawn_link(self.allocator, self, Process.start, module_name);
|
||||
}
|
||||
|
||||
fn deinit(self: *Process) void {
|
||||
self.backend.deinit(self.allocator);
|
||||
self.parent.deinit();
|
||||
self.logger.deinit();
|
||||
self.allocator.destroy(self);
|
||||
}
|
||||
|
||||
fn start(self: *Process) tp.result {
|
||||
errdefer self.deinit();
|
||||
_ = tp.set_trap(true);
|
||||
self.backend = Backend.init() catch |e| return tp.exit_error(e, @errorReturnTrace());
|
||||
self.backend.arm();
|
||||
tp.receive(&self.receiver);
|
||||
}
|
||||
|
||||
fn receive(self: *Process, from: tp.pid_ref, m: tp.message) tp.result {
|
||||
errdefer self.deinit();
|
||||
return self.receive_safe(from, m) catch |e| switch (e) {
|
||||
error.ExitNormal => tp.exit_normal(),
|
||||
else => {
|
||||
const err = tp.exit_error(e, @errorReturnTrace());
|
||||
self.logger.err("receive", err);
|
||||
return err;
|
||||
},
|
||||
};
|
||||
}
|
||||
|
||||
fn receive_safe(self: *Process, _: tp.pid_ref, m: tp.message) (error{ExitNormal} || cbor.Error)!void {
|
||||
var path: []const u8 = undefined;
|
||||
var tag: []const u8 = undefined;
|
||||
var err_code: i64 = 0;
|
||||
var err_msg: []const u8 = undefined;
|
||||
|
||||
if (try cbor.match(m.buf, .{ "fd", tp.extract(&tag), "read_ready" })) {
|
||||
self.backend.drain(self.parent.ref()) catch |e| self.logger.err("drain", e);
|
||||
self.backend.arm();
|
||||
} else if (try cbor.match(m.buf, .{ "fd", tp.extract(&tag), "read_error", tp.extract(&err_code), tp.extract(&err_msg) })) {
|
||||
self.logger.print("fd read error on {s}: ({d}) {s}", .{ tag, err_code, err_msg });
|
||||
self.backend.arm();
|
||||
} else if (builtin.os.tag == .windows and try cbor.match(m.buf, .{"FW_poll"})) {
|
||||
self.backend.drain(self.parent.ref()) catch |e| self.logger.err("drain", e);
|
||||
self.backend.arm();
|
||||
} else if (try cbor.match(m.buf, .{ "watch", tp.extract(&path) })) {
|
||||
self.backend.add_watch(self.allocator, path) catch |e| self.logger.err("watch", e);
|
||||
} else if (try cbor.match(m.buf, .{ "unwatch", tp.extract(&path) })) {
|
||||
self.backend.remove_watch(self.allocator, path);
|
||||
} else if (try cbor.match(m.buf, .{"shutdown"})) {
|
||||
return error.ExitNormal;
|
||||
} else if (try cbor.match(m.buf, .{ "exit", tp.more })) {
|
||||
return error.ExitNormal;
|
||||
} else {
|
||||
self.logger.err("receive", tp.unexpected(m));
|
||||
}
|
||||
}
|
||||
};
|
||||
Loading…
Add table
Add a link
Reference in a new issue