diff options
Diffstat (limited to 'src/core/lib/iomgr/tcp_client_posix.c')
| -rw-r--r-- | src/core/lib/iomgr/tcp_client_posix.c | 306 |
1 files changed, 306 insertions, 0 deletions
diff --git a/src/core/lib/iomgr/tcp_client_posix.c b/src/core/lib/iomgr/tcp_client_posix.c new file mode 100644 index 0000000000..5f948d0d19 --- /dev/null +++ b/src/core/lib/iomgr/tcp_client_posix.c @@ -0,0 +1,306 @@ +/* + * + * Copyright 2015-2016, 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 <grpc/support/port_platform.h> + +#ifdef GPR_POSIX_SOCKET + +#include "src/core/lib/iomgr/tcp_client.h" + +#include <errno.h> +#include <netinet/in.h> +#include <string.h> +#include <unistd.h> + +#include <grpc/support/alloc.h> +#include <grpc/support/log.h> +#include <grpc/support/string_util.h> +#include <grpc/support/time.h> + +#include "src/core/lib/iomgr/ev_posix.h" +#include "src/core/lib/iomgr/iomgr_posix.h" +#include "src/core/lib/iomgr/sockaddr_utils.h" +#include "src/core/lib/iomgr/socket_utils_posix.h" +#include "src/core/lib/iomgr/tcp_posix.h" +#include "src/core/lib/iomgr/timer.h" +#include "src/core/lib/iomgr/unix_sockets_posix.h" +#include "src/core/lib/support/string.h" + +extern int grpc_tcp_trace; + +typedef struct { + gpr_mu mu; + grpc_fd *fd; + gpr_timespec deadline; + grpc_timer alarm; + int refs; + grpc_closure write_closure; + grpc_pollset_set *interested_parties; + char *addr_str; + grpc_endpoint **ep; + grpc_closure *closure; +} async_connect; + +static int prepare_socket(const struct sockaddr *addr, int fd) { + if (fd < 0) { + goto error; + } + + if (!grpc_set_socket_nonblocking(fd, 1) || !grpc_set_socket_cloexec(fd, 1) || + (!grpc_is_unix_socket(addr) && !grpc_set_socket_low_latency(fd, 1)) || + !grpc_set_socket_no_sigpipe_if_possible(fd)) { + gpr_log(GPR_ERROR, "Unable to configure socket %d: %s", fd, + strerror(errno)); + goto error; + } + return 1; + +error: + if (fd >= 0) { + close(fd); + } + return 0; +} + +static void tc_on_alarm(grpc_exec_ctx *exec_ctx, void *acp, bool success) { + int done; + async_connect *ac = acp; + if (grpc_tcp_trace) { + gpr_log(GPR_DEBUG, "CLIENT_CONNECT: %s: on_alarm: success=%d", ac->addr_str, + success); + } + gpr_mu_lock(&ac->mu); + if (ac->fd != NULL) { + grpc_fd_shutdown(exec_ctx, ac->fd); + } + done = (--ac->refs == 0); + gpr_mu_unlock(&ac->mu); + if (done) { + gpr_mu_destroy(&ac->mu); + gpr_free(ac->addr_str); + gpr_free(ac); + } +} + +static void on_writable(grpc_exec_ctx *exec_ctx, void *acp, bool success) { + async_connect *ac = acp; + int so_error = 0; + socklen_t so_error_size; + int err; + int done; + grpc_endpoint **ep = ac->ep; + grpc_closure *closure = ac->closure; + grpc_fd *fd; + + if (grpc_tcp_trace) { + gpr_log(GPR_DEBUG, "CLIENT_CONNECT: %s: on_writable: success=%d", + ac->addr_str, success); + } + + gpr_mu_lock(&ac->mu); + GPR_ASSERT(ac->fd); + fd = ac->fd; + ac->fd = NULL; + gpr_mu_unlock(&ac->mu); + + grpc_timer_cancel(exec_ctx, &ac->alarm); + + gpr_mu_lock(&ac->mu); + if (success) { + do { + so_error_size = sizeof(so_error); + err = getsockopt(grpc_fd_wrapped_fd(fd), SOL_SOCKET, SO_ERROR, &so_error, + &so_error_size); + } while (err < 0 && errno == EINTR); + if (err < 0) { + gpr_log(GPR_ERROR, "failed to connect to '%s': getsockopt(ERROR): %s", + ac->addr_str, strerror(errno)); + goto finish; + } 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"); + gpr_mu_unlock(&ac->mu); + grpc_fd_notify_on_write(exec_ctx, fd, &ac->write_closure); + return; + } else { + switch (so_error) { + case ECONNREFUSED: + gpr_log( + GPR_ERROR, + "failed to connect to '%s': socket error: connection refused", + ac->addr_str); + break; + default: + gpr_log(GPR_ERROR, "failed to connect to '%s': socket error: %d", + ac->addr_str, so_error); + break; + } + goto finish; + } + } else { + grpc_pollset_set_del_fd(exec_ctx, ac->interested_parties, fd); + *ep = grpc_tcp_create(fd, GRPC_TCP_DEFAULT_READ_SLICE_SIZE, ac->addr_str); + fd = NULL; + goto finish; + } + } else { + gpr_log(GPR_ERROR, "failed to connect to '%s': timeout occurred", + ac->addr_str); + goto finish; + } + + GPR_UNREACHABLE_CODE(return ); + +finish: + if (fd != NULL) { + grpc_pollset_set_del_fd(exec_ctx, ac->interested_parties, fd); + grpc_fd_orphan(exec_ctx, fd, NULL, NULL, "tcp_client_orphan"); + fd = NULL; + } + done = (--ac->refs == 0); + gpr_mu_unlock(&ac->mu); + if (done) { + gpr_mu_destroy(&ac->mu); + gpr_free(ac->addr_str); + gpr_free(ac); + } + grpc_exec_ctx_enqueue(exec_ctx, closure, *ep != NULL, NULL); +} + +void grpc_tcp_client_connect(grpc_exec_ctx *exec_ctx, grpc_closure *closure, + grpc_endpoint **ep, + grpc_pollset_set *interested_parties, + const struct sockaddr *addr, size_t addr_len, + gpr_timespec deadline) { + int fd; + grpc_dualstack_mode dsmode; + int err; + async_connect *ac; + struct sockaddr_in6 addr6_v4mapped; + struct sockaddr_in addr4_copy; + grpc_fd *fdobj; + char *name; + char *addr_str; + + *ep = NULL; + + /* Use dualstack sockets where available. */ + if (grpc_sockaddr_to_v4mapped(addr, &addr6_v4mapped)) { + addr = (const struct sockaddr *)&addr6_v4mapped; + addr_len = sizeof(addr6_v4mapped); + } + + fd = grpc_create_dualstack_socket(addr, SOCK_STREAM, 0, &dsmode); + if (fd < 0) { + gpr_log(GPR_ERROR, "Unable to create socket: %s", strerror(errno)); + } + if (dsmode == GRPC_DSMODE_IPV4) { + /* If we got an AF_INET socket, map the address back to IPv4. */ + GPR_ASSERT(grpc_sockaddr_is_v4mapped(addr, &addr4_copy)); + addr = (struct sockaddr *)&addr4_copy; + addr_len = sizeof(addr4_copy); + } + if (!prepare_socket(addr, fd)) { + grpc_exec_ctx_enqueue(exec_ctx, closure, false, NULL); + return; + } + + do { + GPR_ASSERT(addr_len < ~(socklen_t)0); + err = connect(fd, addr, (socklen_t)addr_len); + } while (err < 0 && errno == EINTR); + + addr_str = grpc_sockaddr_to_uri(addr); + gpr_asprintf(&name, "tcp-client:%s", addr_str); + + fdobj = grpc_fd_create(fd, name); + + if (err >= 0) { + *ep = grpc_tcp_create(fdobj, GRPC_TCP_DEFAULT_READ_SLICE_SIZE, addr_str); + grpc_exec_ctx_enqueue(exec_ctx, closure, true, NULL); + goto done; + } + + if (errno != EWOULDBLOCK && errno != EINPROGRESS) { + gpr_log(GPR_ERROR, "connect error to '%s': %s", addr_str, strerror(errno)); + grpc_fd_orphan(exec_ctx, fdobj, NULL, NULL, "tcp_client_connect_error"); + grpc_exec_ctx_enqueue(exec_ctx, closure, false, NULL); + goto done; + } + + grpc_pollset_set_add_fd(exec_ctx, interested_parties, fdobj); + + ac = gpr_malloc(sizeof(async_connect)); + ac->closure = closure; + ac->ep = ep; + ac->fd = fdobj; + ac->interested_parties = interested_parties; + ac->addr_str = addr_str; + addr_str = NULL; + gpr_mu_init(&ac->mu); + ac->refs = 2; + ac->write_closure.cb = on_writable; + ac->write_closure.cb_arg = ac; + + if (grpc_tcp_trace) { + gpr_log(GPR_DEBUG, "CLIENT_CONNECT: %s: asynchronously connecting", + ac->addr_str); + } + + gpr_mu_lock(&ac->mu); + grpc_timer_init(exec_ctx, &ac->alarm, + gpr_convert_clock_type(deadline, GPR_CLOCK_MONOTONIC), + tc_on_alarm, ac, gpr_now(GPR_CLOCK_MONOTONIC)); + grpc_fd_notify_on_write(exec_ctx, ac->fd, &ac->write_closure); + gpr_mu_unlock(&ac->mu); + +done: + gpr_free(name); + gpr_free(addr_str); +} + +#endif |