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/*
*
* Copyright 2014, Google Inc.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following disclaimer
* in the documentation and/or other materials provided with the
* distribution.
* * Neither the name of Google Inc. nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
*/
#include "src/core/endpoint/tcp_client.h"
#include <errno.h>
#include <string.h>
#include <unistd.h>
#include "src/core/endpoint/socket_utils.h"
#include <grpc/support/alloc.h>
#include <grpc/support/log.h>
#include <grpc/support/time.h>
typedef struct {
void (*cb)(void *arg, grpc_endpoint *tcp);
void *cb_arg;
grpc_em_fd fd;
gpr_timespec deadline;
} async_connect;
static int create_fd(int address_family) {
int fd = socket(address_family, SOCK_STREAM, 0);
if (fd < 0) {
gpr_log(GPR_ERROR, "Unable to create socket: %s", strerror(errno));
goto error;
}
if (!grpc_set_socket_nonblocking(fd, 1) || !grpc_set_socket_cloexec(fd, 1) ||
!grpc_set_socket_low_latency(fd, 1)) {
gpr_log(GPR_ERROR, "Unable to configure socket %d: %s", fd,
strerror(errno));
goto error;
}
return fd;
error:
if (fd >= 0) {
close(fd);
}
return -1;
}
static void on_writable(void *acp, grpc_em_cb_status status) {
async_connect *ac = acp;
int so_error = 0;
socklen_t so_error_size;
int err;
int fd = grpc_em_fd_get(&ac->fd);
grpc_em *em = grpc_em_fd_get_em(&ac->fd);
if (status == GRPC_CALLBACK_SUCCESS) {
do {
so_error_size = sizeof(so_error);
err = getsockopt(fd, SOL_SOCKET, SO_ERROR, &so_error, &so_error_size);
} while (err < 0 && errno == EINTR);
if (err < 0) {
gpr_log(GPR_ERROR, "getsockopt(ERROR): %s", strerror(errno));
goto error;
} else if (so_error != 0) {
if (so_error == ENOBUFS) {
/* We will get one of these errors if we have run out of
memory in the kernel for the data structures allocated
when you connect a socket. If this happens it is very
likely that if we wait a little bit then try again the
connection will work (since other programs or this
program will close their network connections and free up
memory). This does _not_ indicate that there is anything
wrong with the server we are connecting to, this is a
local problem.
If you are looking at this code, then chances are that
your program or another program on the same computer
opened too many network connections. The "easy" fix:
don't do that! */
gpr_log(GPR_ERROR, "kernel out of buffers");
grpc_em_fd_notify_on_write(&ac->fd, on_writable, ac, ac->deadline);
return;
} else {
goto error;
}
} else {
goto great_success;
}
} else {
gpr_log(GPR_ERROR, "on_writable failed during connect: status=%d", status);
goto error;
}
abort();
error:
ac->cb(ac->cb_arg, NULL);
grpc_em_fd_destroy(&ac->fd);
gpr_free(ac);
close(fd);
return;
great_success:
grpc_em_fd_destroy(&ac->fd);
ac->cb(ac->cb_arg, grpc_tcp_create(fd, em));
gpr_free(ac);
}
void grpc_tcp_client_connect(void (*cb)(void *arg, grpc_endpoint *ep),
void *arg, grpc_em *em, struct sockaddr *addr,
int len, gpr_timespec deadline) {
int fd = create_fd(addr->sa_family);
int err;
async_connect *ac;
if (fd < 0) {
cb(arg, NULL);
return;
}
do {
err = connect(fd, addr, len);
} while (err < 0 && errno == EINTR);
if (err >= 0) {
cb(arg, grpc_tcp_create(fd, em));
return;
}
if (errno != EWOULDBLOCK && errno != EINPROGRESS) {
gpr_log(GPR_ERROR, "connect error: %s", strerror(errno));
close(fd);
cb(arg, NULL);
return;
}
ac = gpr_malloc(sizeof(async_connect));
ac->cb = cb;
ac->cb_arg = arg;
ac->deadline = deadline;
grpc_em_fd_init(&ac->fd, em, fd);
grpc_em_fd_notify_on_write(&ac->fd, on_writable, ac, deadline);
}
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