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ant/src/net/connection.c
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connection.c
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#include <compat.h> // IWYU pragma: keep
#include <stdlib.h>
#include <string.h>
#include "net/connection.h"
#include "net/listener.h"
#define ANT_CONN_READ_BUFFER_SIZE (16 * 1024)
typedef struct {
uv_write_t req;
uv_buf_t buf;
ant_conn_t *conn;
ant_conn_write_cb cb;
void *user_data;
} ant_conn_write_req_t;
typedef struct {
uv_shutdown_t req;
} ant_conn_shutdown_req_t;
static void ant_conn_restart_timer(ant_conn_t *conn);
static void ant_conn_close_cb(uv_handle_t *handle);
static void ant_listener_remove_conn(ant_listener_t *listener, ant_conn_t *conn) {
ant_conn_t **it = NULL;
if (!listener || !conn) return;
for (it = &listener->connections; *it; it = &(*it)->next) {
if (*it == conn) {
*it = conn->next;
return;
}}
}
static bool ant_conn_store_addr(
uv_tcp_t *handle,
int (*get_name)(const uv_tcp_t *, struct sockaddr *, int *),
char *out_addr,
size_t out_addr_len,
char *out_family,
size_t out_family_len,
int *out_port,
bool *out_has_addr
) {
struct sockaddr_storage addr;
int len = sizeof(addr);
if (get_name(handle, (struct sockaddr *)&addr, &len) != 0) return false;
if (addr.ss_family == AF_INET) {
struct sockaddr_in *in = (struct sockaddr_in *)&addr;
uv_ip4_name(in, out_addr, out_addr_len);
memcpy(out_family, "IPv4", out_family_len < 5 ? out_family_len : 5);
*out_port = ntohs(in->sin_port);
*out_has_addr = true;
return true;
}
if (addr.ss_family == AF_INET6) {
struct sockaddr_in6 *in6 = (struct sockaddr_in6 *)&addr;
uv_ip6_name(in6, out_addr, out_addr_len);
memcpy(out_family, "IPv6", out_family_len < 5 ? out_family_len : 5);
*out_port = ntohs(in6->sin6_port);
*out_has_addr = true;
return true;
}
return false;
}
static bool ant_conn_store_peer_addr(ant_conn_t *conn) {
if (!conn || conn->kind != ANT_CONN_KIND_TCP) return false;
return ant_conn_store_addr(
&conn->handle.tcp,
(int (*)(const uv_tcp_t *, struct sockaddr *, int *))uv_tcp_getpeername,
conn->remote_addr,
sizeof(conn->remote_addr),
conn->remote_family,
sizeof(conn->remote_family),
&conn->remote_port,
&conn->has_remote_addr
);
}
static bool ant_conn_store_local_addr(ant_conn_t *conn) {
if (!conn || conn->kind != ANT_CONN_KIND_TCP) return false;
return ant_conn_store_addr(
&conn->handle.tcp,
(int (*)(const uv_tcp_t *, struct sockaddr *, int *))uv_tcp_getsockname,
conn->local_addr,
sizeof(conn->local_addr),
conn->local_family,
sizeof(conn->local_family),
&conn->local_port,
&conn->has_local_addr
);
}
static void ant_conn_timeout_cb(uv_timer_t *handle) {
ant_conn_t *conn = (ant_conn_t *)handle->data;
ant_listener_t *listener = conn ? conn->listener : NULL;
if (!conn) return;
if (listener && listener->callbacks.on_timeout) {
listener->callbacks.on_timeout(conn, listener->user_data);
return;
}
ant_conn_close(conn);
}
static void ant_conn_restart_timer(ant_conn_t *conn) {
if (!conn || conn->closing) return;
if (conn->timeout_ms == 0) { uv_timer_stop(&conn->timer); return; }
uv_timer_start(&conn->timer, ant_conn_timeout_cb, conn->timeout_ms, 0);
}
static void ant_conn_alloc_cb(uv_handle_t *handle, size_t suggested_size, uv_buf_t *buf) {
ant_conn_t *conn = (ant_conn_t *)handle->data;
size_t next_cap = 0;
char *next = NULL;
if (!conn) {
buf->base = NULL;
buf->len = 0;
return;
}
if (conn->buffer_len + suggested_size > conn->buffer_cap - conn->buffer_offset) {
if (conn->buffer_offset > 0 && conn->buffer_len > 0) memmove(conn->buffer, conn->buffer + conn->buffer_offset, conn->buffer_len);
else if (conn->buffer_offset > 0) conn->buffer_len = 0;
conn->buffer_offset = 0;
if (conn->buffer_len + suggested_size > conn->buffer_cap) {
next_cap = conn->buffer_cap ? conn->buffer_cap * 2 : ANT_CONN_READ_BUFFER_SIZE;
while (next_cap < conn->buffer_len + suggested_size) next_cap *= 2;
next = realloc(conn->buffer, next_cap);
if (!next) {
buf->base = NULL;
buf->len = 0;
return;
}
conn->buffer = next;
conn->buffer_cap = next_cap;
}}
buf->base = conn->buffer + conn->buffer_offset + conn->buffer_len;
buf->len = conn->buffer_cap - conn->buffer_offset - conn->buffer_len;
}
static void ant_conn_read_cb(uv_stream_t *stream, ssize_t nread, const uv_buf_t *buf) {
ant_conn_t *conn = (ant_conn_t *)stream->data;
ant_listener_t *listener = conn ? conn->listener : NULL;
if (!conn || !listener) return;
if (nread < 0) {
if (nread == UV_EOF) {
conn->read_eof = true;
uv_read_stop(ant_conn_stream(conn));
if (listener->callbacks.on_end)
listener->callbacks.on_end(conn, listener->user_data);
return;
}
if (listener->callbacks.on_error) listener->callbacks.on_error(
conn, (int)nread, listener->user_data
);
ant_conn_close(conn);
return;
}
if (nread == 0) return;
conn->bytes_read += (uint64_t)nread;
conn->buffer_len += (size_t)nread;
ant_conn_restart_timer(conn);
if (listener->callbacks.on_read)
listener->callbacks.on_read(conn, nread, listener->user_data);
}
static void ant_conn_write_cb_impl(uv_write_t *req, int status) {
ant_conn_write_req_t *wr = (ant_conn_write_req_t *)req;
if (status >= 0 && wr->conn)
wr->conn->bytes_written += (uint64_t)wr->buf.len;
if (wr->cb) wr->cb(wr->conn, status, wr->user_data);
free(wr->buf.base);
free(wr);
}
static void ant_conn_shutdown_cb(uv_shutdown_t *req, int status) {
ant_conn_shutdown_req_t *shutdown_req = (ant_conn_shutdown_req_t *)req;
free(shutdown_req);
}
static void ant_conn_close_cb(uv_handle_t *handle) {
ant_conn_t *conn = (ant_conn_t *)handle->data;
ant_listener_t *listener = conn ? conn->listener : NULL;
if (!conn || !listener) return;
if (--conn->close_handles > 0) return;
ant_listener_remove_conn(listener, conn);
if (listener->callbacks.on_conn_close)
listener->callbacks.on_conn_close(conn, listener->user_data);
free(conn->buffer);
free(conn);
}
ant_conn_t *ant_conn_create_tcp(ant_listener_t *listener, uint64_t timeout_ms) {
ant_conn_t *conn = NULL;
if (!listener || !listener->loop) return NULL;
conn = calloc(1, sizeof(*conn));
if (!conn) return NULL;
conn->kind = ANT_CONN_KIND_TCP;
conn->listener = listener;
conn->timeout_ms = timeout_ms;
conn->buffer_cap = ANT_CONN_READ_BUFFER_SIZE;
conn->buffer = malloc(conn->buffer_cap);
if (!conn->buffer) {
free(conn);
return NULL;
}
uv_tcp_init(listener->loop, &conn->handle.tcp);
uv_timer_init(listener->loop, &conn->timer);
conn->handle.tcp.data = conn;
conn->timer.data = conn;
return conn;
}
ant_conn_t *ant_conn_create_pipe(ant_listener_t *listener, uint64_t timeout_ms) {
ant_conn_t *conn = NULL;
if (!listener || !listener->loop) return NULL;
conn = calloc(1, sizeof(*conn));
if (!conn) return NULL;
conn->kind = ANT_CONN_KIND_PIPE;
conn->listener = listener;
conn->timeout_ms = timeout_ms;
conn->buffer_cap = ANT_CONN_READ_BUFFER_SIZE;
conn->buffer = malloc(conn->buffer_cap);
if (!conn->buffer) {
free(conn);
return NULL;
}
uv_pipe_init(listener->loop, &conn->handle.pipe, 0);
uv_timer_init(listener->loop, &conn->timer);
conn->handle.pipe.data = conn;
conn->timer.data = conn;
return conn;
}
int ant_conn_accept(ant_conn_t *conn, uv_stream_t *server_stream) {
if (!conn || !server_stream) return UV_EINVAL;
if (uv_accept(server_stream, ant_conn_stream(conn)) != 0)
return UV_ECONNABORTED;
if (conn->kind == ANT_CONN_KIND_TCP) {
ant_conn_store_peer_addr(conn);
ant_conn_store_local_addr(conn);
}
conn->next = conn->listener->connections;
conn->listener->connections = conn;
return 0;
}
void ant_conn_start(ant_conn_t *conn) {
if (!conn || conn->closing) return;
conn->read_paused = false;
ant_conn_restart_timer(conn);
uv_read_start(ant_conn_stream(conn), ant_conn_alloc_cb, ant_conn_read_cb);
}
void ant_conn_set_user_data(ant_conn_t *conn, void *user_data) {
if (conn) conn->user_data = user_data;
}
void *ant_conn_get_user_data(const ant_conn_t *conn) {
return conn ? conn->user_data : NULL;
}
ant_listener_t *ant_conn_listener(const ant_conn_t *conn) {
return conn ? conn->listener : NULL;
}
const char *ant_conn_buffer(const ant_conn_t *conn) {
return conn ? conn->buffer + conn->buffer_offset : NULL;
}
size_t ant_conn_buffer_len(const ant_conn_t *conn) {
return conn ? conn->buffer_len : 0;
}
void ant_conn_set_timeout_ms(ant_conn_t *conn, uint64_t timeout_ms) {
if (!conn) return;
conn->timeout_ms = timeout_ms;
ant_conn_restart_timer(conn);
}
uint64_t ant_conn_timeout_ms(const ant_conn_t *conn) {
return conn ? conn->timeout_ms : 0;
}
bool ant_conn_is_closing(const ant_conn_t *conn) {
return !conn || conn->closing;
}
bool ant_conn_has_local_addr(const ant_conn_t *conn) {
return conn && conn->has_local_addr;
}
bool ant_conn_has_remote_addr(const ant_conn_t *conn) {
return conn && conn->has_remote_addr;
}
const char *ant_conn_local_addr(const ant_conn_t *conn) {
return conn ? conn->local_addr : NULL;
}
const char *ant_conn_remote_addr(const ant_conn_t *conn) {
return conn ? conn->remote_addr : NULL;
}
const char *ant_conn_local_family(const ant_conn_t *conn) {
return conn ? conn->local_family : NULL;
}
const char *ant_conn_remote_family(const ant_conn_t *conn) {
return conn ? conn->remote_family : NULL;
}
int ant_conn_local_port(const ant_conn_t *conn) {
return conn ? conn->local_port : 0;
}
int ant_conn_remote_port(const ant_conn_t *conn) {
return conn ? conn->remote_port : 0;
}
void ant_conn_pause_read(ant_conn_t *conn) {
if (!conn || conn->closing) return;
conn->read_paused = true;
uv_read_stop(ant_conn_stream(conn));
}
void ant_conn_resume_read(ant_conn_t *conn) {
if (!conn || conn->closing || conn->read_eof || !conn->read_paused) return;
conn->read_paused = false;
ant_conn_restart_timer(conn);
uv_read_start(ant_conn_stream(conn), ant_conn_alloc_cb, ant_conn_read_cb);
}
void ant_conn_shutdown(ant_conn_t *conn) {
ant_conn_shutdown_req_t *req = NULL;
int rc = 0;
if (!conn || conn->closing) return;
req = calloc(1, sizeof(*req));
if (!req) {
ant_conn_close(conn);
return;
}
rc = uv_shutdown(&req->req, ant_conn_stream(conn), ant_conn_shutdown_cb);
if (rc != 0) {
free(req);
ant_conn_close(conn);
}
}
void ant_conn_ref(ant_conn_t *conn) {
if (!conn) return;
if (!uv_is_closing((uv_handle_t *)ant_conn_stream(conn))) uv_ref((uv_handle_t *)ant_conn_stream(conn));
if (!uv_is_closing((uv_handle_t *)&conn->timer)) uv_ref((uv_handle_t *)&conn->timer);
}
void ant_conn_unref(ant_conn_t *conn) {
if (!conn) return;
if (!uv_is_closing((uv_handle_t *)ant_conn_stream(conn))) uv_unref((uv_handle_t *)ant_conn_stream(conn));
if (!uv_is_closing((uv_handle_t *)&conn->timer)) uv_unref((uv_handle_t *)&conn->timer);
}
int ant_conn_set_no_delay(ant_conn_t *conn, bool enable) {
if (!conn || conn->closing) return UV_EINVAL;
if (conn->kind != ANT_CONN_KIND_TCP) return UV_ENOTSUP;
return uv_tcp_nodelay(&conn->handle.tcp, enable ? 1 : 0);
}
int ant_conn_set_keep_alive(ant_conn_t *conn, bool enable, unsigned int delay_secs) {
if (!conn || conn->closing) return UV_EINVAL;
if (conn->kind != ANT_CONN_KIND_TCP) return UV_ENOTSUP;
return uv_tcp_keepalive(&conn->handle.tcp, enable ? 1 : 0, delay_secs);
}
void ant_conn_consume(ant_conn_t *conn, size_t len) {
if (!conn || conn->buffer_len == 0 || len == 0) return;
if (len >= conn->buffer_len) {
conn->buffer_offset = 0;
conn->buffer_len = 0;
return;
}
conn->buffer_offset += len;
conn->buffer_len -= len;
}
void ant_conn_close(ant_conn_t *conn) {
if (!conn || conn->closing) return;
conn->closing = true;
conn->close_handles = 0;
if (!uv_is_closing((uv_handle_t *)&conn->timer)) {
uv_timer_stop(&conn->timer);
uv_close((uv_handle_t *)&conn->timer, ant_conn_close_cb);
conn->close_handles++;
}
if (!uv_is_closing((uv_handle_t *)ant_conn_stream(conn))) {
uv_close((uv_handle_t *)ant_conn_stream(conn), ant_conn_close_cb);
conn->close_handles++;
}
if (conn->close_handles == 0) ant_conn_close_cb((uv_handle_t *)ant_conn_stream(conn));
}
int ant_conn_write(ant_conn_t *conn, char *data, size_t len, ant_conn_write_cb cb, void *user_data) {
ant_conn_write_req_t *wr = NULL;
int rc = 0;
if (!conn || conn->closing) {
free(data);
return UV_EPIPE;
}
wr = calloc(1, sizeof(*wr));
if (!wr) {
free(data);
return UV_ENOMEM;
}
wr->buf = uv_buf_init(data, (unsigned int)len);
wr->conn = conn;
wr->cb = cb;
wr->user_data = user_data;
ant_conn_restart_timer(conn);
rc = uv_write(&wr->req, ant_conn_stream(conn), &wr->buf, 1, ant_conn_write_cb_impl);
if (rc != 0) {
free(wr->buf.base);
free(wr);
return rc;
}
return 0;
}
uint64_t ant_conn_bytes_read(const ant_conn_t *conn) {
return conn ? conn->bytes_read : 0;
}
uint64_t ant_conn_bytes_written(const ant_conn_t *conn) {
return conn ? conn->bytes_written : 0;
}

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