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irc: roll our own keepalive
TCP keepalive isn't very cross platform. macOS doesn't let us set
certain settings. Roll our own logic to perform the same sequence as the
linux TCP stack
+53
-26
+53
-26
src/irc.zig
+53
-26
src/irc.zig
···
24
24
/// maximum size message we can receive
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const max_raw_msg_size = 512 + 8191; // see modernircdocs
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+
/// Seconds of idle connection before we start pinging
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+
const keepalive_idle: i32 = 15;
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+
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+
/// Seconds between pings
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+
const keepalive_interval: i32 = 5;
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+
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/// Number of failed pings before we consider the connection failed
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+
const keepalive_retries: i32 = 3;
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+
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pub const Buffer = union(enum) {
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client: *Client,
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channel: *Channel,
···
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while (std.mem.indexOfPos(u8, self.read_buf.items, i, "\r\n")) |idx| {
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ctx.redraw = true;
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defer i = idx + 2;
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log.debug("[<-{s}] {s}", .{
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self.config.name orelse self.config.server,
1583
+
self.read_buf.items[i..idx],
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+
});
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self.handleEvent(self.read_buf.items[i..idx]) catch |err| {
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log.err("error: {}", .{err});
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};
···
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try self.print("USER {s} 0 * {s}\r\n", .{ self.config.user, self.config.real_name });
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var buf: [4096]u8 = undefined;
2099
+
var retries: u8 = 0;
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2100
while (true) {
2087
-
const n = try self.read(&buf);
2101
+
const n = self.read(&buf) catch |err| {
2102
+
// WouldBlock means our socket timeout expired
2103
+
switch (err) {
2104
+
error.WouldBlock => {},
2105
+
else => return err,
2106
+
}
2107
+
2108
+
if (retries == keepalive_retries) {
2109
+
log.debug("[{s}] connection closed", .{self.config.name orelse self.config.server});
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+
self.close();
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+
return;
2112
+
}
2113
+
2114
+
if (retries == 0) {
2115
+
try self.configureKeepalive(keepalive_interval);
2116
+
}
2117
+
retries += 1;
2118
+
try self.queueWrite("PING comlink\r\n");
2119
+
continue;
2120
+
};
2088
2121
if (n == 0) return;
2122
+
2123
+
// If we did a connection retry, we reset the state
2124
+
if (retries > 0) {
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+
retries = 0;
2126
+
try self.configureKeepalive(keepalive_idle);
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+
}
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self.read_buf_mutex.lock();
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defer self.read_buf_mutex.unlock();
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try self.read_buf.appendSlice(buf[0..n]);
···
2110
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}
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2112
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pub fn write(self: *Client, buf: []const u8) !void {
2152
+
assert(std.mem.endsWith(u8, buf, "\r\n"));
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if (self.status.load(.unordered) == .disconnected) {
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log.warn("disconnected: dropping write: {s}", .{buf[0 .. buf.len - 2]});
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return;
···
2135
2175
}
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self.status.store(.connected, .unordered);
2137
2177
2138
-
try self.configureKeepalive();
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try self.configureKeepalive(keepalive_idle);
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}
2140
2180
2141
-
pub fn configureKeepalive(self: *Client) !void {
2142
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const sock = self.stream.handle;
2181
+
pub fn configureKeepalive(self: *Client, seconds: i32) !void {
2182
+
const timeout = std.mem.toBytes(std.posix.timeval{
2183
+
.tv_sec = seconds,
2184
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.tv_usec = 0,
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});
2143
2186
2144
-
const os = std.c;
2145
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const size = @sizeOf(i32);
2146
-
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const enable: i32 = 1;
2148
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if (os.setsockopt(sock, os.SOL.SOCKET, os.SO.KEEPALIVE, &enable, size) != 0) {
2149
-
return error.SetSockOptError;
2150
-
}
2151
-
2152
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const idle: i32 = 10; // 10 seconds
2153
-
if (os.setsockopt(sock, os.IPPROTO.TCP, os.TCP.KEEPIDLE, &idle, size) != 0) {
2154
-
return error.SetSockOptError;
2155
-
}
2156
-
2157
-
const interval: i32 = 5; // 5 seconds
2158
-
if (os.setsockopt(sock, os.IPPROTO.TCP, os.TCP.KEEPINTVL, &interval, size) != 0) {
2159
-
return error.SetSockOptError;
2160
-
}
2161
-
2162
-
const count: i32 = 3; // 3 probes before closing
2163
-
if (os.setsockopt(sock, os.IPPROTO.TCP, os.TCP.KEEPCNT, &count, size) != 0) {
2164
-
return error.SetSockOptError;
2165
-
}
2187
+
try std.posix.setsockopt(
2188
+
self.stream.handle,
2189
+
std.posix.SOL.SOCKET,
2190
+
std.posix.SO.RCVTIMEO,
2191
+
&timeout,
2192
+
);
2166
2193
}
2167
2194
2168
2195
pub fn getOrCreateChannel(self: *Client, name: []const u8) Allocator.Error!*Channel {