658 lines
24 KiB
Zig
658 lines
24 KiB
Zig
const std = @import("std");
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const hexdump = @import("./hexdump.zig");
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const testing = std.testing;
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const net = std.net;
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const os = std.os;
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const fmt = std.fmt;
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const receive_fd = @import("./exchange-fd.zig").receive_fd;
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const Timer = std.time.Timer;
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const print = std.debug.print;
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const CBEvent = @import("./callback.zig").CBEvent;
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const Connection = @import("./connection.zig").Connection;
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const Message = @import("./message.zig").Message;
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const Event = @import("./event.zig").Event;
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const Switch = @import("./switch.zig").Switch;
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const print_eq = @import("./util.zig").print_eq;
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const Messages = @import("./message.zig").Messages;
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const Switches = @import("./switch.zig").Switches;
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const Connections = @import("./connection.zig").Connections;
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pub const PollFD = std.ArrayList(std.os.pollfd);
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pub const IPC_HEADER_SIZE = 5; // Size (5 bytes) then content.
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pub const IPC_BASE_SIZE = 2000000; // 2 MB, plenty enough space for messages
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pub const IPC_MAX_MESSAGE_SIZE = IPC_BASE_SIZE-IPC_HEADER_SIZE;
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pub const IPC_VERSION = 1;
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// Context of the whole networking state.
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pub const Context = struct {
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rundir: [] u8,
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allocator: std.mem.Allocator, // Memory allocator.
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connections: Connections, // Keep track of connections.
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// "pollfd" structures passed to poll(2). Same indexes as "connections".
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pollfd: PollFD, // .fd (fd_t) + .events (i16) + .revents (i16)
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tx: Messages, // Messages to send, once their fd is available.
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switchdb: Switches, // Relations between fd.
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timer: ?i32 = null, // No timer by default (no TIMER event).
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const Self = @This();
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// Context initialization:
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// - init structures (provide the allocator)
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pub fn init(allocator: std.mem.Allocator) !Self {
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var rundir = std.process.getEnvVarOwned(allocator, "RUNDIR") catch |err| switch(err) {
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error.EnvironmentVariableNotFound => blk: {
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break :blk try allocator.dupeZ(u8, "/tmp/libipc-run/");
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},
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else => {
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return err;
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},
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};
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return Self {
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.rundir = rundir
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, .connections = Connections.init(allocator)
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, .pollfd = PollFD.init(allocator)
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, .tx = Messages.init(allocator)
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, .switchdb = try Switches.init(allocator)
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, .allocator = allocator
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};
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}
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// create a server path for the UNIX socket based on the service name
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pub fn server_path(self: *Self, service_name: []const u8, writer: anytype) !void {
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try writer.print("{s}/{s}", .{self.rundir, service_name});
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}
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pub fn deinit(self: *Self) void {
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self.close_all() catch |err| switch(err){
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error.IndexOutOfBounds => {
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print("context.deinit(): IndexOutOfBounds\n", .{});
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},
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};
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self.allocator.free(self.rundir);
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self.connections.deinit();
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self.pollfd.deinit();
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for (self.tx.items) |m| {
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m.deinit();
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}
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self.tx.deinit();
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self.switchdb.deinit();
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}
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// Both simple connection and the switched one share this code.
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fn connect_ (self: *Self, ctype: Connection.Type, path: []const u8) !i32 {
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var stream = try net.connectUnixSocket(path);
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const newfd = stream.handle;
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errdefer std.os.closeSocket(newfd);
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var newcon = Connection.init(ctype, null);
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try self.add_ (newcon, newfd);
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return newfd;
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}
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fn connect_ipcd (self: *Self, service_name: []const u8
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, connection_type: Connection.Type) !?i32 {
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const buffer_size = 10000;
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var buffer: [buffer_size]u8 = undefined;
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var fba = std.heap.FixedBufferAllocator.init(&buffer);
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var allocator = fba.allocator();
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// Get IPC_NETWORK environment variable
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// IPC_NETWORK is shared with the network service to choose the protocol stack,
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// according to the target service.
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//
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// Example, connecting to 'audio' service through tor service:
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// IPC_NETWORK="audio tor://some.example.com/audio"
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//
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// Routing directives can be chained using " ;" separator:
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// IPC_NETWORK="audio https://example.com/audio ;pong tls://pong.example.com/pong"
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var network_envvar = std.process.getEnvVarOwned(allocator, "IPC_NETWORK") catch |err| switch(err) {
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// error{ OutOfMemory, EnvironmentVariableNotFound, InvalidUtf8 } (ErrorSet)
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error.EnvironmentVariableNotFound => {
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print("no IPC_NETWORK envvar: IPCd won't be contacted\n", .{});
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return null;
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}, // no need to contact IPCd
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else => { return err; },
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};
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var lookupbuffer: [buffer_size]u8 = undefined;
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var lookupfbs = std.io.fixedBufferStream(&lookupbuffer);
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var lookupwriter = lookupfbs.writer();
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try lookupwriter.print("{s};{s}", .{service_name, network_envvar});
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// Try to connect to the IPCd service
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var ipcdfd = try self.connect_service("ipc");
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defer self.close_fd (ipcdfd) catch {}; // in any case, connection should be closed
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// Send LOOKUP message
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// content: target service name;${IPC_NETWORK}
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// example: pong;pong tls://example.com:8998/pong
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var m = try Message.init (ipcdfd, allocator, lookupfbs.getWritten());
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try self.write (m);
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// Read LOOKUP response
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// case error: ignore and move on (TODO)
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// else: get fd sent by IPCd then close IPCd fd
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var reception_buffer: [2000]u8 = undefined;
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var reception_size: usize = 0;
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var newfd = try receive_fd (ipcdfd, &reception_buffer, &reception_size);
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if (reception_size == 0) {
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return error.IPCdFailedNoMessage;
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}
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var response: []u8 = reception_buffer[0..reception_size];
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// print ("receive_fd:message received: {s} (len: {})\n", .{response, reception_size});
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if (! std.mem.eql(u8, response, "ok")) {
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return error.IPCdFailedNotOk;
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}
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var newcon = Connection.init(connection_type, null);
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try self.add_ (newcon, newfd);
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return newfd;
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}
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/// TODO: Add a new connection, but takes care of memory problems:
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/// in case one of the arrays cannot sustain another entry, the other
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/// won't be added.
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fn add_ (self: *Self, new_connection: Connection, fd: os.socket_t) !void {
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try self.connections.append(new_connection);
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try self.pollfd.append(.{ .fd = fd
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, .events = std.os.linux.POLL.IN
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, .revents = 0 });
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}
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fn fd_to_index (self: Self, fd: i32) !usize {
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var i: usize = 0;
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while(i < self.pollfd.items.len) {
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if (self.pollfd.items[i].fd == fd) {
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return i;
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}
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i += 1;
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}
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return error.IndexNotFound;
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}
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// Return the new fd. Can be useful to the caller.
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pub fn connect(self: *Self, path: []const u8) !i32 {
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return self.connect_ (Connection.Type.IPC, path);
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}
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pub fn connect_service (self: *Self, service_name: []const u8) !i32 {
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var buffer: [1000]u8 = undefined;
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var fbs = std.io.fixedBufferStream(&buffer);
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var writer = fbs.writer();
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try self.server_path(service_name, writer);
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var path = fbs.getWritten();
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return self.connect(path);
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}
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pub fn connect_ipc (self: *Self, service_name: []const u8) !i32 {
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// First, try ipcd.
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if (try self.connect_ipcd (service_name, Connection.Type.IPC)) |fd| {
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print("Connected via IPCd, fd is {}\n", .{fd});
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return fd;
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}
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// In case this doesn't work, connect directly.
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return try self.connect_service (service_name);
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}
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// Connection to a service, but with switched with the client fd.
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// pub fn connection_switched(self: *Self
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// , path: [] const u8
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// , clientfd: i32) !i32 {
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// // print("connection switched from {} to path {s}\n", .{clientfd, path});
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// var newfd = try self.connect_ (Connection.Type.SWITCHED, path);
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// // TODO: record switch.
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// return newfd;
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// }
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pub fn accept_new_client(self: *Self, event: *Event, server_index: usize) !void {
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// net.StreamServer
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var serverfd = self.pollfd.items[server_index].fd;
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var path = self.connections.items[server_index].path orelse return error.ServerWithNoPath;
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var server = net.StreamServer {
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.sockfd = serverfd
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, .kernel_backlog = 100
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, .reuse_address = false
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, .listen_address = try net.Address.initUnix(path)
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};
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var client = try server.accept(); // net.StreamServer.Connection
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const newfd = client.stream.handle;
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var newcon = Connection.init(Connection.Type.IPC, null);
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try self.add_ (newcon, newfd);
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const sfd = server.sockfd orelse return error.SocketLOL; // TODO
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// WARNING: imply every new item is last
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event.set(Event.Type.CONNECTION, self.pollfd.items.len - 1, sfd, null);
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}
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// Create a unix socket.
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// Store std lib structures in the context.
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pub fn server_init(self: *Self, service_name: [] const u8) !net.StreamServer {
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var buffer: [1000]u8 = undefined;
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var fbs = std.io.fixedBufferStream(&buffer);
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var writer = fbs.writer();
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try self.server_path(service_name, writer);
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var path = fbs.getWritten();
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// print("context server init {s}\n", .{path});
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var server = net.StreamServer.init(.{});
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var socket_addr = try net.Address.initUnix(path);
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try server.listen(socket_addr);
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const newfd = server.sockfd orelse return error.SocketLOL; // TODO
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// Store the path in the Connection structure, so the UNIX socket file can be removed later.
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var newcon = Connection.init(Connection.Type.SERVER, try self.allocator.dupeZ(u8, path));
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try self.add_ (newcon, newfd);
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return server;
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}
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pub fn write (_: *Self, m: Message) !void {
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// Message contains the fd, no need to search for
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// the right structure to copy, let's just recreate
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// a Stream from the fd.
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var stream = net.Stream { .handle = m.fd };
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var buffer: [IPC_MAX_MESSAGE_SIZE]u8 = undefined;
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var fbs = std.io.fixedBufferStream(&buffer);
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var writer = fbs.writer();
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_ = try m.write(writer); // returns paylen
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_ = try stream.write (fbs.getWritten());
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}
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pub fn schedule (self: *Self, m: Message) !void {
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try self.tx.append(m);
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}
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pub fn read (self: *Self, index: usize) !?Message {
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if (index >= self.pollfd.items.len) {
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return error.IndexOutOfBounds;
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}
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var buffer: [IPC_MAX_MESSAGE_SIZE]u8 = undefined; // TODO: FIXME??
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var packet_size: usize = undefined;
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// TODO: this is a problem from the network API in Zig,
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// servers and clients are different, they aren't just fds.
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// Maybe there is something to change in the API.
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if (self.connections.items[index].t == .SERVER) {
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return error.messageOnServer;
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}
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// This may be kinda hacky, idk.
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var fd = self.pollfd.items[index].fd;
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var stream: net.Stream = .{ .handle = fd };
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packet_size = try stream.read(buffer[0..]);
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// Let's handle this as a disconnection.
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if (packet_size <= 4) {
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return null;
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}
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return try Message.read(fd, buffer[0..], self.allocator);
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}
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// Wait for an event.
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pub fn wait_event(self: *Self) !Event {
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var current_event: Event = Event.init(Event.Type.ERROR, 0, 0, null);
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var wait_duration: i32 = -1; // -1 == unlimited
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if (self.timer) |t| { wait_duration = t; }
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else { print("listening (no timer)\n", .{}); }
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// Make sure we listen to the right file descriptors,
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// setting POLLIN & POLLOUT flags.
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for (self.pollfd.items) |*fd| {
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fd.events |= std.os.linux.POLL.IN; // just to make sure
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}
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for (self.tx.items) |m| {
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for (self.pollfd.items) |*fd| {
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if (fd.fd == m.fd) {
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fd.events |= std.os.linux.POLL.OUT; // just to make sure
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}
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}
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}
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// before initiate a timer
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var timer = try Timer.start();
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// Polling.
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var count: usize = undefined;
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// print("fds: {any}\n", .{self.pollfd.items});
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count = try os.poll(self.pollfd.items, wait_duration);
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// print("fds NOW: {any}\n", .{self.pollfd.items});
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if (count < 0) {
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print("there is a problem: poll < 0\n", .{});
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current_event = Event.init(Event.Type.ERROR, 0, 0, null);
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return current_event;
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}
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var duration = timer.read() / 1000000; // ns -> ms
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if (count == 0) {
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if (duration >= wait_duration) {
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current_event = Event.init(Event.Type.TIMER, 0, 0, null);
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}
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else {
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// In case nothing happened, and poll wasn't triggered by time out.
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current_event = Event.init(Event.Type.ERROR, 0, 0, null);
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}
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return current_event;
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}
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// handle messages
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// => loop over self.pollfd.items
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for (self.pollfd.items) |*fd, i| {
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// .revents is POLLIN
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if(fd.revents & std.os.linux.POLL.IN > 0) {
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// SERVER = new connection
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if (self.connections.items[i].t == .SERVER) {
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try self.accept_new_client(¤t_event, i);
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return current_event;
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}
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// SWITCHED = send message to the right dest (or drop the switch)
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else if (self.connections.items[i].t == .SWITCHED) {
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// TODO: read message from fd.fd + schedule read message
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return Event.init(Event.Type.SWITCH, i, fd.fd, null);
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}
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// EXTERNAL = user handles IO
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else if (self.connections.items[i].t == .EXTERNAL) {
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return Event.init(Event.Type.EXTERNAL, i, fd.fd, null);
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}
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// otherwise = new message or disconnection
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else {
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var maybe_message = self.read(i) catch |err| switch(err) {
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error.ConnectionResetByPeer => {
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print("connection reset by peer\n", .{});
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try self.close(i);
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return Event.init(Event.Type.DISCONNECTION, i, fd.fd, null);
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},
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else => { return err; },
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};
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if (maybe_message) |m| {
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return Event.init(Event.Type.MESSAGE, i, fd.fd, m);
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}
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try self.close(i);
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return Event.init(Event.Type.DISCONNECTION, i, fd.fd, null);
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}
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}
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// .revent is POLLOUT
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if(fd.revents & std.os.linux.POLL.OUT > 0) {
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fd.events &= ~ @as(i16, std.os.linux.POLL.OUT);
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// SWITCHED = write message for its switch buddy (callbacks)
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if (self.connections.items[i].t == .SWITCHED) {
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// TODO: write message
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return Event.init(Event.Type.SWITCH, i, fd.fd, null);
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}
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else {
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// otherwise = write message for the msg.fd
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var index: usize = undefined;
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for (self.tx.items) |m, index_| {
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if (m.fd == self.pollfd.items[i].fd) {
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index = index_;
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break;
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}
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}
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var m = self.tx.swapRemove(index);
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try self.write (m);
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m.deinit();
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return Event.init(Event.Type.TX, i, fd.fd, null);
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}
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}
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// .revent is POLLHUP
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if(fd.revents & std.os.linux.POLL.HUP > 0) {
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// handle disconnection
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current_event = Event.init(Event.Type.DISCONNECTION, i, fd.fd, null);
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try self.close(i);
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return current_event;
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}
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// if fd revent is POLLERR or POLLNVAL
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if ((fd.revents & std.os.linux.POLL.HUP > 0) or
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(fd.revents & std.os.linux.POLL.NVAL > 0)) {
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return Event.init(Event.Type.ERROR, i, fd.fd, null);
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}
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}
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return current_event;
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}
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/// Remove a connection based on its file descriptor.
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pub fn close_fd(self: *Self, fd: i32) !void {
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try self.close(try self.fd_to_index (fd));
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}
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pub fn close(self: *Self, index: usize) !void {
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// REMINDER: connections and pollfd have the same length
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if (index >= self.pollfd.items.len) {
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return error.IndexOutOfBounds;
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}
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// close the connection and remove it from the two structures
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var con = self.connections.swapRemove(index);
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// Remove service's UNIX socket file.
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if (con.path) |path| {
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std.fs.cwd().deleteFile(path) catch {};
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self.allocator.free(path);
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}
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var pollfd = self.pollfd.swapRemove(index);
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std.os.close(pollfd.fd);
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// Remove all its non-sent messages.
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var i: usize = 0;
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while (true) {
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if (i >= self.tx.items.len)
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break;
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if (self.tx.items[i].fd == pollfd.fd) {
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var m = self.tx.swapRemove(i);
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m.deinit();
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continue;
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}
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i += 1;
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}
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}
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pub fn close_all(self: *Self) !void {
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while(self.connections.items.len > 0) { try self.close(0); }
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}
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pub fn format(self: Self, comptime form: []const u8, options: fmt.FormatOptions, out_stream: anytype) !void {
|
|
try fmt.format(out_stream
|
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, "context ({} connections and {} messages):"
|
|
, .{self.connections.items.len, self.tx.items.len});
|
|
|
|
for (self.connections.items) |con| {
|
|
try fmt.format(out_stream, "\n- ", .{});
|
|
try con.format(form, options, out_stream);
|
|
}
|
|
|
|
for (self.tx.items) |tx| {
|
|
try fmt.format(out_stream, "\n- ", .{});
|
|
try tx.format(form, options, out_stream);
|
|
}
|
|
}
|
|
};
|
|
|
|
//test "Simple structures - init, display and memory check" {
|
|
// // origin destination
|
|
// var s = Switch.init(3,8);
|
|
// var payload = "hello!!";
|
|
// // fd type payload
|
|
// var m = Message.init(0, allocator, payload);
|
|
//
|
|
// // type index origin message
|
|
// var e = Event.init(Event.Type.CONNECTION, 5, 8, &m);
|
|
|
|
// // CLIENT SIDE: connection to a service.
|
|
// _ = try c.connect(path);
|
|
|
|
// // TODO: connection to a server, but switched with clientfd "3".
|
|
// _ = try c.connection_switched(path, 3);
|
|
//}
|
|
|
|
// Creating a new thread: testing UNIX communication.
|
|
// This is a client sending a raw "Hello world!" bytestring,
|
|
// not an instance of Message.
|
|
const CommunicationTestThread = struct {
|
|
fn clientFn() !void {
|
|
const config = .{.safety = true};
|
|
var gpa = std.heap.GeneralPurposeAllocator(config){};
|
|
defer _ = gpa.deinit();
|
|
const allocator = gpa.allocator();
|
|
|
|
var c = try Context.init(allocator);
|
|
defer c.deinit(); // There. Can't leak. Isn't Zig wonderful?
|
|
|
|
var buffer: [1000]u8 = undefined;
|
|
var fbs = std.io.fixedBufferStream(&buffer);
|
|
var writer = fbs.writer();
|
|
|
|
try c.server_path("simple-context-test", writer);
|
|
var path = fbs.getWritten();
|
|
const socket = try net.connectUnixSocket(path);
|
|
defer socket.close();
|
|
_ = try socket.writer().writeAll("Hello world!");
|
|
}
|
|
};
|
|
|
|
test "Context - creation, display and memory check" {
|
|
const config = .{.safety = true};
|
|
var gpa = std.heap.GeneralPurposeAllocator(config){};
|
|
defer _ = gpa.deinit();
|
|
|
|
const allocator = gpa.allocator();
|
|
|
|
var c = try Context.init(allocator);
|
|
defer c.deinit(); // There. Can't leak. Isn't Zig wonderful?
|
|
|
|
var buffer: [1000]u8 = undefined;
|
|
var fbs = std.io.fixedBufferStream(&buffer);
|
|
var writer = fbs.writer();
|
|
try c.server_path("simple-context-test", writer);
|
|
var path = fbs.getWritten();
|
|
|
|
// SERVER SIDE: creating a service.
|
|
var server = c.server_init("simple-context-test") catch |err| switch(err) {
|
|
error.FileNotFound => {
|
|
print ("\nError: cannot init server at {s}\n", .{path});
|
|
return err;
|
|
},
|
|
else => return err,
|
|
};
|
|
defer std.fs.cwd().deleteFile(path) catch {}; // Once done, remove file.
|
|
|
|
const t = try std.Thread.spawn(.{}, CommunicationTestThread.clientFn, .{});
|
|
defer t.join();
|
|
|
|
// Server.accept returns a net.StreamServer.Connection.
|
|
var client = try server.accept();
|
|
defer client.stream.close();
|
|
var buf: [16]u8 = undefined;
|
|
const n = try client.stream.reader().read(&buf);
|
|
|
|
try testing.expectEqual(@as(usize, 12), n);
|
|
try testing.expectEqualSlices(u8, "Hello world!", buf[0..n]);
|
|
}
|
|
|
|
// Creating a new thread: testing UNIX communication.
|
|
// This is a client sending a an instance of Message.
|
|
const ConnectThenSendMessageThread = struct {
|
|
fn clientFn() !void {
|
|
const config = .{.safety = true};
|
|
var gpa = std.heap.GeneralPurposeAllocator(config){};
|
|
defer _ = gpa.deinit();
|
|
const allocator = gpa.allocator();
|
|
|
|
var c = try Context.init(allocator);
|
|
defer c.deinit(); // There. Can't leak. Isn't Zig wonderful?
|
|
|
|
var path_buffer: [1000]u8 = undefined;
|
|
var path_fbs = std.io.fixedBufferStream(&path_buffer);
|
|
var path_writer = path_fbs.writer();
|
|
try c.server_path("simple-context-test", path_writer);
|
|
var path = path_fbs.getWritten();
|
|
|
|
// Actual UNIX socket connection.
|
|
const socket = try net.connectUnixSocket(path);
|
|
defer socket.close();
|
|
|
|
// Writing message into a buffer.
|
|
var message_buffer: [1000]u8 = undefined;
|
|
var message_fbs = std.io.fixedBufferStream(&message_buffer);
|
|
var message_writer = message_fbs.writer();
|
|
// 'fd' parameter is not taken into account here (no loop)
|
|
|
|
var m = try Message.init(0, allocator, "Hello world!");
|
|
defer m.deinit();
|
|
_ = try m.write(message_writer);
|
|
|
|
_ = try socket.writer().writeAll(message_fbs.getWritten());
|
|
}
|
|
};
|
|
|
|
|
|
test "Context - creation, echo once" {
|
|
const config = .{.safety = true};
|
|
var gpa = std.heap.GeneralPurposeAllocator(config){};
|
|
defer _ = gpa.deinit();
|
|
|
|
const allocator = gpa.allocator();
|
|
|
|
var c = try Context.init(allocator);
|
|
defer c.deinit(); // There. Can't leak. Isn't Zig wonderful?
|
|
|
|
var buffer: [1000]u8 = undefined;
|
|
var fbs = std.io.fixedBufferStream(&buffer);
|
|
var writer = fbs.writer();
|
|
try c.server_path("simple-context-test", writer);
|
|
var path = fbs.getWritten();
|
|
|
|
// SERVER SIDE: creating a service.
|
|
var server = c.server_init("simple-context-test") catch |err| switch(err) {
|
|
error.FileNotFound => {
|
|
print ("\nError: cannot init server at {s}\n", .{path});
|
|
return err;
|
|
},
|
|
else => return err,
|
|
};
|
|
defer std.fs.cwd().deleteFile(path) catch {}; // Once done, remove file.
|
|
|
|
const t = try std.Thread.spawn(.{}, ConnectThenSendMessageThread.clientFn, .{});
|
|
defer t.join();
|
|
|
|
// Server.accept returns a net.StreamServer.Connection.
|
|
var client = try server.accept();
|
|
defer client.stream.close();
|
|
var buf: [1000]u8 = undefined;
|
|
const n = try client.stream.reader().read(&buf);
|
|
var m = try Message.read(8, buf[0..n], allocator); // 8 == random client's fd number
|
|
defer m.deinit();
|
|
|
|
try testing.expectEqual(@as(usize, 12), m.payload.len);
|
|
try testing.expectEqualSlices(u8, m.payload, "Hello world!");
|
|
}
|