/* * * Copyright 2015 gRPC authors. * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. * */ #include "src/core/lib/iomgr/port.h" #ifdef GRPC_POSIX_SOCKET #include "src/core/lib/iomgr/network_status_tracker.h" #include "src/core/lib/iomgr/tcp_posix.h" #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include "src/core/lib/channel/channel_args.h" #include "src/core/lib/debug/stats.h" #include "src/core/lib/debug/trace.h" #include "src/core/lib/iomgr/ev_posix.h" #include "src/core/lib/iomgr/executor.h" #include "src/core/lib/profiling/timers.h" #include "src/core/lib/slice/slice_internal.h" #include "src/core/lib/slice/slice_string_helpers.h" #include "src/core/lib/support/string.h" #ifdef GRPC_HAVE_MSG_NOSIGNAL #define SENDMSG_FLAGS MSG_NOSIGNAL #else #define SENDMSG_FLAGS 0 #endif #ifdef GRPC_MSG_IOVLEN_TYPE typedef GRPC_MSG_IOVLEN_TYPE msg_iovlen_type; #else typedef size_t msg_iovlen_type; #endif grpc_tracer_flag grpc_tcp_trace = GRPC_TRACER_INITIALIZER(false, "tcp"); typedef struct { grpc_endpoint base; grpc_fd *em_fd; int fd; bool finished_edge; double target_length; double bytes_read_this_round; gpr_refcount refcount; gpr_atm shutdown_count; int min_read_chunk_size; int max_read_chunk_size; /* garbage after the last read */ grpc_slice_buffer last_read_buffer; grpc_slice_buffer *incoming_buffer; grpc_slice_buffer *outgoing_buffer; /** slice within outgoing_buffer to write next */ size_t outgoing_slice_idx; /** byte within outgoing_buffer->slices[outgoing_slice_idx] to write next */ size_t outgoing_byte_idx; grpc_closure *read_cb; grpc_closure *write_cb; grpc_closure *release_fd_cb; int *release_fd; grpc_closure read_done_closure; grpc_closure write_done_closure; char *peer_string; grpc_resource_user *resource_user; grpc_resource_user_slice_allocator slice_allocator; } grpc_tcp; typedef struct backup_poller { gpr_mu *pollset_mu; grpc_closure run_poller; } backup_poller; #define BACKUP_POLLER_POLLSET(b) ((grpc_pollset *)((b) + 1)) static gpr_atm g_uncovered_notifications_pending; static gpr_atm g_backup_poller; /* backup_poller* */ static void tcp_handle_read(grpc_exec_ctx *exec_ctx, void *arg /* grpc_tcp */, grpc_error *error); static void tcp_handle_write(grpc_exec_ctx *exec_ctx, void *arg /* grpc_tcp */, grpc_error *error); static void tcp_drop_uncovered_then_handle_write(grpc_exec_ctx *exec_ctx, void *arg /* grpc_tcp */, grpc_error *error); static void done_poller(grpc_exec_ctx *exec_ctx, void *bp, grpc_error *error_ignored) { backup_poller *p = (backup_poller *)bp; if (GRPC_TRACER_ON(grpc_tcp_trace)) { gpr_log(GPR_DEBUG, "BACKUP_POLLER:%p destroy", p); } grpc_pollset_destroy(exec_ctx, BACKUP_POLLER_POLLSET(p)); gpr_free(p); } static void run_poller(grpc_exec_ctx *exec_ctx, void *bp, grpc_error *error_ignored) { backup_poller *p = (backup_poller *)bp; if (GRPC_TRACER_ON(grpc_tcp_trace)) { gpr_log(GPR_DEBUG, "BACKUP_POLLER:%p run", p); } gpr_mu_lock(p->pollset_mu); grpc_millis deadline = grpc_exec_ctx_now(exec_ctx) + 13 * GPR_MS_PER_SEC; GRPC_STATS_INC_TCP_BACKUP_POLLER_POLLS(exec_ctx); GRPC_LOG_IF_ERROR( "backup_poller:pollset_work", grpc_pollset_work(exec_ctx, BACKUP_POLLER_POLLSET(p), NULL, deadline)); gpr_mu_unlock(p->pollset_mu); /* last "uncovered" notification is the ref that keeps us polling, if we get * there try a cas to release it */ if (gpr_atm_no_barrier_load(&g_uncovered_notifications_pending) == 1 && gpr_atm_full_cas(&g_uncovered_notifications_pending, 1, 0)) { gpr_mu_lock(p->pollset_mu); bool cas_ok = gpr_atm_full_cas(&g_backup_poller, (gpr_atm)p, 0); if (GRPC_TRACER_ON(grpc_tcp_trace)) { gpr_log(GPR_DEBUG, "BACKUP_POLLER:%p done cas_ok=%d", p, cas_ok); } gpr_mu_unlock(p->pollset_mu); if (GRPC_TRACER_ON(grpc_tcp_trace)) { gpr_log(GPR_DEBUG, "BACKUP_POLLER:%p shutdown", p); } grpc_pollset_shutdown(exec_ctx, BACKUP_POLLER_POLLSET(p), GRPC_CLOSURE_INIT(&p->run_poller, done_poller, p, grpc_schedule_on_exec_ctx)); } else { if (GRPC_TRACER_ON(grpc_tcp_trace)) { gpr_log(GPR_DEBUG, "BACKUP_POLLER:%p reschedule", p); } GRPC_CLOSURE_SCHED(exec_ctx, &p->run_poller, GRPC_ERROR_NONE); } } static void drop_uncovered(grpc_exec_ctx *exec_ctx, grpc_tcp *tcp) { backup_poller *p = (backup_poller *)gpr_atm_acq_load(&g_backup_poller); gpr_atm old_count = gpr_atm_no_barrier_fetch_add(&g_uncovered_notifications_pending, -1); if (GRPC_TRACER_ON(grpc_tcp_trace)) { gpr_log(GPR_DEBUG, "BACKUP_POLLER:%p uncover cnt %d->%d", p, (int)old_count, (int)old_count - 1); } GPR_ASSERT(old_count != 1); } static void cover_self(grpc_exec_ctx *exec_ctx, grpc_tcp *tcp) { backup_poller *p; gpr_atm old_count = gpr_atm_no_barrier_fetch_add(&g_uncovered_notifications_pending, 2); if (GRPC_TRACER_ON(grpc_tcp_trace)) { gpr_log(GPR_DEBUG, "BACKUP_POLLER: cover cnt %d->%d", (int)old_count, 2 + (int)old_count); } if (old_count == 0) { GRPC_STATS_INC_TCP_BACKUP_POLLERS_CREATED(exec_ctx); p = (backup_poller *)gpr_zalloc(sizeof(*p) + grpc_pollset_size()); if (GRPC_TRACER_ON(grpc_tcp_trace)) { gpr_log(GPR_DEBUG, "BACKUP_POLLER:%p create", p); } grpc_pollset_init(BACKUP_POLLER_POLLSET(p), &p->pollset_mu); gpr_atm_rel_store(&g_backup_poller, (gpr_atm)p); GRPC_CLOSURE_SCHED( exec_ctx, GRPC_CLOSURE_INIT(&p->run_poller, run_poller, p, grpc_executor_scheduler(GRPC_EXECUTOR_LONG)), GRPC_ERROR_NONE); } else { while ((p = (backup_poller *)gpr_atm_acq_load(&g_backup_poller)) == NULL) { // spin waiting for backup poller } } if (GRPC_TRACER_ON(grpc_tcp_trace)) { gpr_log(GPR_DEBUG, "BACKUP_POLLER:%p add %p", p, tcp); } grpc_pollset_add_fd(exec_ctx, BACKUP_POLLER_POLLSET(p), tcp->em_fd); if (old_count != 0) { drop_uncovered(exec_ctx, tcp); } } static void notify_on_read(grpc_exec_ctx *exec_ctx, grpc_tcp *tcp) { if (GRPC_TRACER_ON(grpc_tcp_trace)) { gpr_log(GPR_DEBUG, "TCP:%p notify_on_read", tcp); } GRPC_CLOSURE_INIT(&tcp->read_done_closure, tcp_handle_read, tcp, grpc_schedule_on_exec_ctx); grpc_fd_notify_on_read(exec_ctx, tcp->em_fd, &tcp->read_done_closure); } static void notify_on_write(grpc_exec_ctx *exec_ctx, grpc_tcp *tcp) { if (GRPC_TRACER_ON(grpc_tcp_trace)) { gpr_log(GPR_DEBUG, "TCP:%p notify_on_write", tcp); } cover_self(exec_ctx, tcp); GRPC_CLOSURE_INIT(&tcp->write_done_closure, tcp_drop_uncovered_then_handle_write, tcp, grpc_schedule_on_exec_ctx); grpc_fd_notify_on_write(exec_ctx, tcp->em_fd, &tcp->write_done_closure); } static void tcp_drop_uncovered_then_handle_write(grpc_exec_ctx *exec_ctx, void *arg, grpc_error *error) { if (GRPC_TRACER_ON(grpc_tcp_trace)) { gpr_log(GPR_DEBUG, "TCP:%p got_write: %s", arg, grpc_error_string(error)); } drop_uncovered(exec_ctx, (grpc_tcp *)arg); tcp_handle_write(exec_ctx, arg, error); } static void add_to_estimate(grpc_tcp *tcp, size_t bytes) { tcp->bytes_read_this_round += (double)bytes; } static void finish_estimate(grpc_tcp *tcp) { /* If we read >80% of the target buffer in one read loop, increase the size of the target buffer to either the amount read, or twice its previous value */ if (tcp->bytes_read_this_round > tcp->target_length * 0.8) { tcp->target_length = GPR_MAX(2 * tcp->target_length, tcp->bytes_read_this_round); } else { tcp->target_length = 0.99 * tcp->target_length + 0.01 * tcp->bytes_read_this_round; } tcp->bytes_read_this_round = 0; } static size_t get_target_read_size(grpc_tcp *tcp) { grpc_resource_quota *rq = grpc_resource_user_quota(tcp->resource_user); double pressure = grpc_resource_quota_get_memory_pressure(rq); double target = tcp->target_length * (pressure > 0.8 ? (1.0 - pressure) / 0.2 : 1.0); size_t sz = (((size_t)GPR_CLAMP(target, tcp->min_read_chunk_size, tcp->max_read_chunk_size)) + 255) & ~(size_t)255; /* don't use more than 1/16th of the overall resource quota for a single read * alloc */ size_t rqmax = grpc_resource_quota_peek_size(rq); if (sz > rqmax / 16 && rqmax > 1024) { sz = rqmax / 16; } return sz; } static grpc_error *tcp_annotate_error(grpc_error *src_error, grpc_tcp *tcp) { return grpc_error_set_str( grpc_error_set_int(src_error, GRPC_ERROR_INT_FD, tcp->fd), GRPC_ERROR_STR_TARGET_ADDRESS, grpc_slice_from_copied_string(tcp->peer_string)); } static void tcp_handle_read(grpc_exec_ctx *exec_ctx, void *arg /* grpc_tcp */, grpc_error *error); static void tcp_handle_write(grpc_exec_ctx *exec_ctx, void *arg /* grpc_tcp */, grpc_error *error); static void tcp_shutdown(grpc_exec_ctx *exec_ctx, grpc_endpoint *ep, grpc_error *why) { grpc_tcp *tcp = (grpc_tcp *)ep; grpc_fd_shutdown(exec_ctx, tcp->em_fd, why); grpc_resource_user_shutdown(exec_ctx, tcp->resource_user); } static void tcp_free(grpc_exec_ctx *exec_ctx, grpc_tcp *tcp) { grpc_fd_orphan(exec_ctx, tcp->em_fd, tcp->release_fd_cb, tcp->release_fd, false /* already_closed */, "tcp_unref_orphan"); grpc_slice_buffer_destroy_internal(exec_ctx, &tcp->last_read_buffer); grpc_resource_user_unref(exec_ctx, tcp->resource_user); gpr_free(tcp->peer_string); gpr_free(tcp); } #ifndef NDEBUG #define TCP_UNREF(cl, tcp, reason) \ tcp_unref((cl), (tcp), (reason), __FILE__, __LINE__) #define TCP_REF(tcp, reason) tcp_ref((tcp), (reason), __FILE__, __LINE__) static void tcp_unref(grpc_exec_ctx *exec_ctx, grpc_tcp *tcp, const char *reason, const char *file, int line) { if (GRPC_TRACER_ON(grpc_tcp_trace)) { gpr_atm val = gpr_atm_no_barrier_load(&tcp->refcount.count); gpr_log(file, line, GPR_LOG_SEVERITY_DEBUG, "TCP unref %p : %s %" PRIdPTR " -> %" PRIdPTR, tcp, reason, val, val - 1); } if (gpr_unref(&tcp->refcount)) { tcp_free(exec_ctx, tcp); } } static void tcp_ref(grpc_tcp *tcp, const char *reason, const char *file, int line) { if (GRPC_TRACER_ON(grpc_tcp_trace)) { gpr_atm val = gpr_atm_no_barrier_load(&tcp->refcount.count); gpr_log(file, line, GPR_LOG_SEVERITY_DEBUG, "TCP ref %p : %s %" PRIdPTR " -> %" PRIdPTR, tcp, reason, val, val + 1); } gpr_ref(&tcp->refcount); } #else #define TCP_UNREF(cl, tcp, reason) tcp_unref((cl), (tcp)) #define TCP_REF(tcp, reason) tcp_ref((tcp)) static void tcp_unref(grpc_exec_ctx *exec_ctx, grpc_tcp *tcp) { if (gpr_unref(&tcp->refcount)) { tcp_free(exec_ctx, tcp); } } static void tcp_ref(grpc_tcp *tcp) { gpr_ref(&tcp->refcount); } #endif static void tcp_destroy(grpc_exec_ctx *exec_ctx, grpc_endpoint *ep) { grpc_network_status_unregister_endpoint(ep); grpc_tcp *tcp = (grpc_tcp *)ep; grpc_slice_buffer_reset_and_unref_internal(exec_ctx, &tcp->last_read_buffer); TCP_UNREF(exec_ctx, tcp, "destroy"); } static void call_read_cb(grpc_exec_ctx *exec_ctx, grpc_tcp *tcp, grpc_error *error) { grpc_closure *cb = tcp->read_cb; if (GRPC_TRACER_ON(grpc_tcp_trace)) { gpr_log(GPR_DEBUG, "TCP:%p call_cb %p %p:%p", tcp, cb, cb->cb, cb->cb_arg); size_t i; const char *str = grpc_error_string(error); gpr_log(GPR_DEBUG, "read: error=%s", str); for (i = 0; i < tcp->incoming_buffer->count; i++) { char *dump = grpc_dump_slice(tcp->incoming_buffer->slices[i], GPR_DUMP_HEX | GPR_DUMP_ASCII); gpr_log(GPR_DEBUG, "READ %p (peer=%s): %s", tcp, tcp->peer_string, dump); gpr_free(dump); } } tcp->read_cb = NULL; tcp->incoming_buffer = NULL; GRPC_CLOSURE_RUN(exec_ctx, cb, error); } #define MAX_READ_IOVEC 4 static void tcp_do_read(grpc_exec_ctx *exec_ctx, grpc_tcp *tcp) { struct msghdr msg; struct iovec iov[MAX_READ_IOVEC]; ssize_t read_bytes; size_t i; GPR_ASSERT(!tcp->finished_edge); GPR_ASSERT(tcp->incoming_buffer->count <= MAX_READ_IOVEC); GPR_TIMER_BEGIN("tcp_continue_read", 0); for (i = 0; i < tcp->incoming_buffer->count; i++) { iov[i].iov_base = GRPC_SLICE_START_PTR(tcp->incoming_buffer->slices[i]); iov[i].iov_len = GRPC_SLICE_LENGTH(tcp->incoming_buffer->slices[i]); } msg.msg_name = NULL; msg.msg_namelen = 0; msg.msg_iov = iov; msg.msg_iovlen = (msg_iovlen_type)tcp->incoming_buffer->count; msg.msg_control = NULL; msg.msg_controllen = 0; msg.msg_flags = 0; GRPC_STATS_INC_TCP_READ_OFFER(exec_ctx, tcp->incoming_buffer->length); GRPC_STATS_INC_TCP_READ_OFFER_IOV_SIZE(exec_ctx, tcp->incoming_buffer->count); GPR_TIMER_BEGIN("recvmsg", 0); do { GRPC_STATS_INC_SYSCALL_READ(exec_ctx); read_bytes = recvmsg(tcp->fd, &msg, 0); } while (read_bytes < 0 && errno == EINTR); GPR_TIMER_END("recvmsg", read_bytes >= 0); if (read_bytes < 0) { /* NB: After calling call_read_cb a parallel call of the read handler may * be running. */ if (errno == EAGAIN) { finish_estimate(tcp); /* We've consumed the edge, request a new one */ notify_on_read(exec_ctx, tcp); } else { grpc_slice_buffer_reset_and_unref_internal(exec_ctx, tcp->incoming_buffer); call_read_cb(exec_ctx, tcp, tcp_annotate_error(GRPC_OS_ERROR(errno, "recvmsg"), tcp)); TCP_UNREF(exec_ctx, tcp, "read"); } } else if (read_bytes == 0) { /* 0 read size ==> end of stream */ grpc_slice_buffer_reset_and_unref_internal(exec_ctx, tcp->incoming_buffer); call_read_cb( exec_ctx, tcp, tcp_annotate_error( GRPC_ERROR_CREATE_FROM_STATIC_STRING("Socket closed"), tcp)); TCP_UNREF(exec_ctx, tcp, "read"); } else { GRPC_STATS_INC_TCP_READ_SIZE(exec_ctx, read_bytes); add_to_estimate(tcp, (size_t)read_bytes); GPR_ASSERT((size_t)read_bytes <= tcp->incoming_buffer->length); if ((size_t)read_bytes < tcp->incoming_buffer->length) { grpc_slice_buffer_trim_end( tcp->incoming_buffer, tcp->incoming_buffer->length - (size_t)read_bytes, &tcp->last_read_buffer); } GPR_ASSERT((size_t)read_bytes == tcp->incoming_buffer->length); call_read_cb(exec_ctx, tcp, GRPC_ERROR_NONE); TCP_UNREF(exec_ctx, tcp, "read"); } GPR_TIMER_END("tcp_continue_read", 0); } static void tcp_read_allocation_done(grpc_exec_ctx *exec_ctx, void *tcpp, grpc_error *error) { grpc_tcp *tcp = (grpc_tcp *)tcpp; if (GRPC_TRACER_ON(grpc_tcp_trace)) { gpr_log(GPR_DEBUG, "TCP:%p read_allocation_done: %s", tcp, grpc_error_string(error)); } if (error != GRPC_ERROR_NONE) { grpc_slice_buffer_reset_and_unref_internal(exec_ctx, tcp->incoming_buffer); grpc_slice_buffer_reset_and_unref_internal(exec_ctx, &tcp->last_read_buffer); call_read_cb(exec_ctx, tcp, GRPC_ERROR_REF(error)); TCP_UNREF(exec_ctx, tcp, "read"); } else { tcp_do_read(exec_ctx, tcp); } } static void tcp_continue_read(grpc_exec_ctx *exec_ctx, grpc_tcp *tcp) { size_t target_read_size = get_target_read_size(tcp); if (tcp->incoming_buffer->length < target_read_size && tcp->incoming_buffer->count < MAX_READ_IOVEC) { if (GRPC_TRACER_ON(grpc_tcp_trace)) { gpr_log(GPR_DEBUG, "TCP:%p alloc_slices", tcp); } grpc_resource_user_alloc_slices(exec_ctx, &tcp->slice_allocator, target_read_size, 1, tcp->incoming_buffer); } else { if (GRPC_TRACER_ON(grpc_tcp_trace)) { gpr_log(GPR_DEBUG, "TCP:%p do_read", tcp); } tcp_do_read(exec_ctx, tcp); } } static void tcp_handle_read(grpc_exec_ctx *exec_ctx, void *arg /* grpc_tcp */, grpc_error *error) { grpc_tcp *tcp = (grpc_tcp *)arg; GPR_ASSERT(!tcp->finished_edge); if (GRPC_TRACER_ON(grpc_tcp_trace)) { gpr_log(GPR_DEBUG, "TCP:%p got_read: %s", tcp, grpc_error_string(error)); } if (error != GRPC_ERROR_NONE) { grpc_slice_buffer_reset_and_unref_internal(exec_ctx, tcp->incoming_buffer); grpc_slice_buffer_reset_and_unref_internal(exec_ctx, &tcp->last_read_buffer); call_read_cb(exec_ctx, tcp, GRPC_ERROR_REF(error)); TCP_UNREF(exec_ctx, tcp, "read"); } else { tcp_continue_read(exec_ctx, tcp); } } static void tcp_read(grpc_exec_ctx *exec_ctx, grpc_endpoint *ep, grpc_slice_buffer *incoming_buffer, grpc_closure *cb) { grpc_tcp *tcp = (grpc_tcp *)ep; GPR_ASSERT(tcp->read_cb == NULL); tcp->read_cb = cb; tcp->incoming_buffer = incoming_buffer; grpc_slice_buffer_reset_and_unref_internal(exec_ctx, incoming_buffer); grpc_slice_buffer_swap(incoming_buffer, &tcp->last_read_buffer); TCP_REF(tcp, "read"); if (tcp->finished_edge) { tcp->finished_edge = false; notify_on_read(exec_ctx, tcp); } else { GRPC_CLOSURE_SCHED(exec_ctx, &tcp->read_done_closure, GRPC_ERROR_NONE); } } /* returns true if done, false if pending; if returning true, *error is set */ #define MAX_WRITE_IOVEC 1000 static bool tcp_flush(grpc_exec_ctx *exec_ctx, grpc_tcp *tcp, grpc_error **error) { struct msghdr msg; struct iovec iov[MAX_WRITE_IOVEC]; msg_iovlen_type iov_size; ssize_t sent_length; size_t sending_length; size_t trailing; size_t unwind_slice_idx; size_t unwind_byte_idx; for (;;) { sending_length = 0; unwind_slice_idx = tcp->outgoing_slice_idx; unwind_byte_idx = tcp->outgoing_byte_idx; for (iov_size = 0; tcp->outgoing_slice_idx != tcp->outgoing_buffer->count && iov_size != MAX_WRITE_IOVEC; iov_size++) { iov[iov_size].iov_base = GRPC_SLICE_START_PTR( tcp->outgoing_buffer->slices[tcp->outgoing_slice_idx]) + tcp->outgoing_byte_idx; iov[iov_size].iov_len = GRPC_SLICE_LENGTH( tcp->outgoing_buffer->slices[tcp->outgoing_slice_idx]) - tcp->outgoing_byte_idx; sending_length += iov[iov_size].iov_len; tcp->outgoing_slice_idx++; tcp->outgoing_byte_idx = 0; } GPR_ASSERT(iov_size > 0); msg.msg_name = NULL; msg.msg_namelen = 0; msg.msg_iov = iov; msg.msg_iovlen = iov_size; msg.msg_control = NULL; msg.msg_controllen = 0; msg.msg_flags = 0; GRPC_STATS_INC_TCP_WRITE_SIZE(exec_ctx, sending_length); GRPC_STATS_INC_TCP_WRITE_IOV_SIZE(exec_ctx, iov_size); GPR_TIMER_BEGIN("sendmsg", 1); do { /* TODO(klempner): Cork if this is a partial write */ GRPC_STATS_INC_SYSCALL_WRITE(exec_ctx); sent_length = sendmsg(tcp->fd, &msg, SENDMSG_FLAGS); } while (sent_length < 0 && errno == EINTR); GPR_TIMER_END("sendmsg", 0); if (sent_length < 0) { if (errno == EAGAIN) { tcp->outgoing_slice_idx = unwind_slice_idx; tcp->outgoing_byte_idx = unwind_byte_idx; return false; } else if (errno == EPIPE) { *error = grpc_error_set_int(GRPC_OS_ERROR(errno, "sendmsg"), GRPC_ERROR_INT_GRPC_STATUS, GRPC_STATUS_UNAVAILABLE); return true; } else { *error = tcp_annotate_error(GRPC_OS_ERROR(errno, "sendmsg"), tcp); return true; } } GPR_ASSERT(tcp->outgoing_byte_idx == 0); trailing = sending_length - (size_t)sent_length; while (trailing > 0) { size_t slice_length; tcp->outgoing_slice_idx--; slice_length = GRPC_SLICE_LENGTH( tcp->outgoing_buffer->slices[tcp->outgoing_slice_idx]); if (slice_length > trailing) { tcp->outgoing_byte_idx = slice_length - trailing; break; } else { trailing -= slice_length; } } if (tcp->outgoing_slice_idx == tcp->outgoing_buffer->count) { *error = GRPC_ERROR_NONE; return true; } }; } static void tcp_handle_write(grpc_exec_ctx *exec_ctx, void *arg /* grpc_tcp */, grpc_error *error) { grpc_tcp *tcp = (grpc_tcp *)arg; grpc_closure *cb; if (error != GRPC_ERROR_NONE) { cb = tcp->write_cb; tcp->write_cb = NULL; cb->cb(exec_ctx, cb->cb_arg, error); TCP_UNREF(exec_ctx, tcp, "write"); return; } if (!tcp_flush(exec_ctx, tcp, &error)) { if (GRPC_TRACER_ON(grpc_tcp_trace)) { gpr_log(GPR_DEBUG, "write: delayed"); } notify_on_write(exec_ctx, tcp); } else { cb = tcp->write_cb; tcp->write_cb = NULL; if (GRPC_TRACER_ON(grpc_tcp_trace)) { const char *str = grpc_error_string(error); gpr_log(GPR_DEBUG, "write: %s", str); } GRPC_CLOSURE_RUN(exec_ctx, cb, error); TCP_UNREF(exec_ctx, tcp, "write"); } } static void tcp_write(grpc_exec_ctx *exec_ctx, grpc_endpoint *ep, grpc_slice_buffer *buf, grpc_closure *cb) { grpc_tcp *tcp = (grpc_tcp *)ep; grpc_error *error = GRPC_ERROR_NONE; if (GRPC_TRACER_ON(grpc_tcp_trace)) { size_t i; for (i = 0; i < buf->count; i++) { char *data = grpc_dump_slice(buf->slices[i], GPR_DUMP_HEX | GPR_DUMP_ASCII); gpr_log(GPR_DEBUG, "WRITE %p (peer=%s): %s", tcp, tcp->peer_string, data); gpr_free(data); } } GPR_TIMER_BEGIN("tcp_write", 0); GPR_ASSERT(tcp->write_cb == NULL); if (buf->length == 0) { GPR_TIMER_END("tcp_write", 0); GRPC_CLOSURE_SCHED( exec_ctx, cb, grpc_fd_is_shutdown(tcp->em_fd) ? tcp_annotate_error(GRPC_ERROR_CREATE_FROM_STATIC_STRING("EOF"), tcp) : GRPC_ERROR_NONE); return; } tcp->outgoing_buffer = buf; tcp->outgoing_slice_idx = 0; tcp->outgoing_byte_idx = 0; if (!tcp_flush(exec_ctx, tcp, &error)) { TCP_REF(tcp, "write"); tcp->write_cb = cb; if (GRPC_TRACER_ON(grpc_tcp_trace)) { gpr_log(GPR_DEBUG, "write: delayed"); } notify_on_write(exec_ctx, tcp); } else { if (GRPC_TRACER_ON(grpc_tcp_trace)) { const char *str = grpc_error_string(error); gpr_log(GPR_DEBUG, "write: %s", str); } GRPC_CLOSURE_SCHED(exec_ctx, cb, error); } GPR_TIMER_END("tcp_write", 0); } static void tcp_add_to_pollset(grpc_exec_ctx *exec_ctx, grpc_endpoint *ep, grpc_pollset *pollset) { grpc_tcp *tcp = (grpc_tcp *)ep; grpc_pollset_add_fd(exec_ctx, pollset, tcp->em_fd); } static void tcp_add_to_pollset_set(grpc_exec_ctx *exec_ctx, grpc_endpoint *ep, grpc_pollset_set *pollset_set) { grpc_tcp *tcp = (grpc_tcp *)ep; grpc_pollset_set_add_fd(exec_ctx, pollset_set, tcp->em_fd); } static char *tcp_get_peer(grpc_endpoint *ep) { grpc_tcp *tcp = (grpc_tcp *)ep; return gpr_strdup(tcp->peer_string); } static int tcp_get_fd(grpc_endpoint *ep) { grpc_tcp *tcp = (grpc_tcp *)ep; return tcp->fd; } static grpc_resource_user *tcp_get_resource_user(grpc_endpoint *ep) { grpc_tcp *tcp = (grpc_tcp *)ep; return tcp->resource_user; } static const grpc_endpoint_vtable vtable = { tcp_read, tcp_write, tcp_add_to_pollset, tcp_add_to_pollset_set, tcp_shutdown, tcp_destroy, tcp_get_resource_user, tcp_get_peer, tcp_get_fd}; #define MAX_CHUNK_SIZE 32 * 1024 * 1024 grpc_endpoint *grpc_tcp_create(grpc_exec_ctx *exec_ctx, grpc_fd *em_fd, const grpc_channel_args *channel_args, const char *peer_string) { int tcp_read_chunk_size = GRPC_TCP_DEFAULT_READ_SLICE_SIZE; int tcp_max_read_chunk_size = 4 * 1024 * 1024; int tcp_min_read_chunk_size = 256; grpc_resource_quota *resource_quota = grpc_resource_quota_create(NULL); if (channel_args != NULL) { for (size_t i = 0; i < channel_args->num_args; i++) { if (0 == strcmp(channel_args->args[i].key, GRPC_ARG_TCP_READ_CHUNK_SIZE)) { grpc_integer_options options = {(int)tcp_read_chunk_size, 1, MAX_CHUNK_SIZE}; tcp_read_chunk_size = grpc_channel_arg_get_integer(&channel_args->args[i], options); } else if (0 == strcmp(channel_args->args[i].key, GRPC_ARG_TCP_MIN_READ_CHUNK_SIZE)) { grpc_integer_options options = {(int)tcp_read_chunk_size, 1, MAX_CHUNK_SIZE}; tcp_min_read_chunk_size = grpc_channel_arg_get_integer(&channel_args->args[i], options); } else if (0 == strcmp(channel_args->args[i].key, GRPC_ARG_TCP_MAX_READ_CHUNK_SIZE)) { grpc_integer_options options = {(int)tcp_read_chunk_size, 1, MAX_CHUNK_SIZE}; tcp_max_read_chunk_size = grpc_channel_arg_get_integer(&channel_args->args[i], options); } else if (0 == strcmp(channel_args->args[i].key, GRPC_ARG_RESOURCE_QUOTA)) { grpc_resource_quota_unref_internal(exec_ctx, resource_quota); resource_quota = grpc_resource_quota_ref_internal( (grpc_resource_quota *)channel_args->args[i].value.pointer.p); } } } if (tcp_min_read_chunk_size > tcp_max_read_chunk_size) { tcp_min_read_chunk_size = tcp_max_read_chunk_size; } tcp_read_chunk_size = GPR_CLAMP(tcp_read_chunk_size, tcp_min_read_chunk_size, tcp_max_read_chunk_size); grpc_tcp *tcp = (grpc_tcp *)gpr_malloc(sizeof(grpc_tcp)); tcp->base.vtable = &vtable; tcp->peer_string = gpr_strdup(peer_string); tcp->fd = grpc_fd_wrapped_fd(em_fd); tcp->read_cb = NULL; tcp->write_cb = NULL; tcp->release_fd_cb = NULL; tcp->release_fd = NULL; tcp->incoming_buffer = NULL; tcp->target_length = (double)tcp_read_chunk_size; tcp->min_read_chunk_size = tcp_min_read_chunk_size; tcp->max_read_chunk_size = tcp_max_read_chunk_size; tcp->bytes_read_this_round = 0; tcp->finished_edge = true; /* paired with unref in grpc_tcp_destroy */ gpr_ref_init(&tcp->refcount, 1); gpr_atm_no_barrier_store(&tcp->shutdown_count, 0); tcp->em_fd = em_fd; grpc_slice_buffer_init(&tcp->last_read_buffer); tcp->resource_user = grpc_resource_user_create(resource_quota, peer_string); grpc_resource_user_slice_allocator_init( &tcp->slice_allocator, tcp->resource_user, tcp_read_allocation_done, tcp); /* Tell network status tracker about new endpoint */ grpc_network_status_register_endpoint(&tcp->base); grpc_resource_quota_unref_internal(exec_ctx, resource_quota); return &tcp->base; } int grpc_tcp_fd(grpc_endpoint *ep) { grpc_tcp *tcp = (grpc_tcp *)ep; GPR_ASSERT(ep->vtable == &vtable); return grpc_fd_wrapped_fd(tcp->em_fd); } void grpc_tcp_destroy_and_release_fd(grpc_exec_ctx *exec_ctx, grpc_endpoint *ep, int *fd, grpc_closure *done) { grpc_network_status_unregister_endpoint(ep); grpc_tcp *tcp = (grpc_tcp *)ep; GPR_ASSERT(ep->vtable == &vtable); tcp->release_fd = fd; tcp->release_fd_cb = done; grpc_slice_buffer_reset_and_unref_internal(exec_ctx, &tcp->last_read_buffer); TCP_UNREF(exec_ctx, tcp, "destroy"); } #endif