diff options
Diffstat (limited to 'src/core/lib/iomgr/tcp_uv.c')
| -rw-r--r-- | src/core/lib/iomgr/tcp_uv.c | 379 |
1 files changed, 379 insertions, 0 deletions
diff --git a/src/core/lib/iomgr/tcp_uv.c b/src/core/lib/iomgr/tcp_uv.c new file mode 100644 index 0000000000..8e74c9e863 --- /dev/null +++ b/src/core/lib/iomgr/tcp_uv.c @@ -0,0 +1,379 @@ +/* + * + * Copyright 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 "src/core/lib/iomgr/port.h" + +#ifdef GRPC_UV + +#include <limits.h> +#include <string.h> + +#include <grpc/support/alloc.h> +#include <grpc/support/log.h> +#include <grpc/support/slice_buffer.h> +#include <grpc/support/string_util.h> + +#include "src/core/lib/iomgr/error.h" +#include "src/core/lib/iomgr/network_status_tracker.h" +#include "src/core/lib/iomgr/tcp_uv.h" +#include "src/core/lib/support/string.h" + +int grpc_tcp_trace = 0; + +typedef struct { + grpc_endpoint base; + gpr_refcount refcount; + + uv_write_t write_req; + uv_shutdown_t shutdown_req; + + uv_tcp_t *handle; + + grpc_closure *read_cb; + grpc_closure *write_cb; + + gpr_slice read_slice; + gpr_slice_buffer *read_slices; + gpr_slice_buffer *write_slices; + uv_buf_t *write_buffers; + + grpc_resource_user resource_user; + + bool shutting_down; + bool resource_user_shutting_down; + + char *peer_string; + grpc_pollset *pollset; +} grpc_tcp; + +static void uv_close_callback(uv_handle_t *handle) { gpr_free(handle); } + +static void tcp_free(grpc_tcp *tcp) { + grpc_exec_ctx exec_ctx = GRPC_EXEC_CTX_INIT; + grpc_resource_user_destroy(&exec_ctx, &tcp->resource_user); + gpr_free(tcp); + grpc_exec_ctx_finish(&exec_ctx); +} + +/*#define GRPC_TCP_REFCOUNT_DEBUG*/ +#ifdef GRPC_TCP_REFCOUNT_DEBUG +#define TCP_UNREF(tcp, reason) tcp_unref((tcp), (reason), __FILE__, __LINE__) +#define TCP_REF(tcp, reason) tcp_ref((tcp), (reason), __FILE__, __LINE__) +static void tcp_unref(grpc_tcp *tcp, const char *reason, const char *file, + int line) { + gpr_log(file, line, GPR_LOG_SEVERITY_DEBUG, "TCP unref %p : %s %d -> %d", tcp, + reason, tcp->refcount.count, tcp->refcount.count - 1); + if (gpr_unref(&tcp->refcount)) { + tcp_free(tcp); + } +} + +static void tcp_ref(grpc_tcp *tcp, const char *reason, const char *file, + int line) { + gpr_log(file, line, GPR_LOG_SEVERITY_DEBUG, "TCP ref %p : %s %d -> %d", tcp, + reason, tcp->refcount.count, tcp->refcount.count + 1); + gpr_ref(&tcp->refcount); +} +#else +#define TCP_UNREF(tcp, reason) tcp_unref((tcp)) +#define TCP_REF(tcp, reason) tcp_ref((tcp)) +static void tcp_unref(grpc_tcp *tcp) { + if (gpr_unref(&tcp->refcount)) { + tcp_free(tcp); + } +} + +static void tcp_ref(grpc_tcp *tcp) { gpr_ref(&tcp->refcount); } +#endif + +static void alloc_uv_buf(uv_handle_t *handle, size_t suggested_size, + uv_buf_t *buf) { + grpc_exec_ctx exec_ctx = GRPC_EXEC_CTX_INIT; + grpc_tcp *tcp = handle->data; + (void)suggested_size; + tcp->read_slice = grpc_resource_user_slice_malloc( + &exec_ctx, &tcp->resource_user, GRPC_TCP_DEFAULT_READ_SLICE_SIZE); + buf->base = (char *)GPR_SLICE_START_PTR(tcp->read_slice); + buf->len = GPR_SLICE_LENGTH(tcp->read_slice); + grpc_exec_ctx_finish(&exec_ctx); +} + +static void read_callback(uv_stream_t *stream, ssize_t nread, + const uv_buf_t *buf) { + gpr_slice sub; + grpc_error *error; + grpc_exec_ctx exec_ctx = GRPC_EXEC_CTX_INIT; + grpc_tcp *tcp = stream->data; + grpc_closure *cb = tcp->read_cb; + if (nread == 0) { + // Nothing happened. Wait for the next callback + return; + } + TCP_UNREF(tcp, "read"); + tcp->read_cb = NULL; + // TODO(murgatroid99): figure out what the return value here means + uv_read_stop(stream); + if (nread == UV_EOF) { + error = GRPC_ERROR_CREATE("EOF"); + } else if (nread > 0) { + // Successful read + sub = gpr_slice_sub_no_ref(tcp->read_slice, 0, (size_t)nread); + gpr_slice_buffer_add(tcp->read_slices, sub); + error = GRPC_ERROR_NONE; + if (grpc_tcp_trace) { + size_t i; + const char *str = grpc_error_string(error); + gpr_log(GPR_DEBUG, "read: error=%s", str); + grpc_error_free_string(str); + for (i = 0; i < tcp->read_slices->count; i++) { + char *dump = gpr_dump_slice(tcp->read_slices->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); + } + } + } else { + // nread < 0: Error + error = GRPC_ERROR_CREATE("TCP Read failed"); + } + grpc_exec_ctx_sched(&exec_ctx, cb, error, NULL); + grpc_exec_ctx_finish(&exec_ctx); +} + +static void uv_endpoint_read(grpc_exec_ctx *exec_ctx, grpc_endpoint *ep, + gpr_slice_buffer *read_slices, grpc_closure *cb) { + grpc_tcp *tcp = (grpc_tcp *)ep; + int status; + grpc_error *error = GRPC_ERROR_NONE; + GPR_ASSERT(tcp->read_cb == NULL); + tcp->read_cb = cb; + tcp->read_slices = read_slices; + gpr_slice_buffer_reset_and_unref(read_slices); + TCP_REF(tcp, "read"); + // TODO(murgatroid99): figure out what the return value here means + status = + uv_read_start((uv_stream_t *)tcp->handle, alloc_uv_buf, read_callback); + if (status != 0) { + error = GRPC_ERROR_CREATE("TCP Read failed at start"); + error = + grpc_error_set_str(error, GRPC_ERROR_STR_OS_ERROR, uv_strerror(status)); + grpc_exec_ctx_sched(exec_ctx, cb, error, NULL); + } + if (grpc_tcp_trace) { + const char *str = grpc_error_string(error); + gpr_log(GPR_DEBUG, "Initiating read on %p: error=%s", tcp, str); + } +} + +static void write_callback(uv_write_t *req, int status) { + grpc_tcp *tcp = req->data; + grpc_error *error; + grpc_exec_ctx exec_ctx = GRPC_EXEC_CTX_INIT; + grpc_closure *cb = tcp->write_cb; + tcp->write_cb = NULL; + TCP_UNREF(tcp, "write"); + if (status == 0) { + error = GRPC_ERROR_NONE; + } else { + error = GRPC_ERROR_CREATE("TCP Write failed"); + } + if (grpc_tcp_trace) { + const char *str = grpc_error_string(error); + gpr_log(GPR_DEBUG, "write complete on %p: error=%s", tcp, str); + } + gpr_free(tcp->write_buffers); + grpc_resource_user_free(&exec_ctx, &tcp->resource_user, + sizeof(uv_buf_t) * tcp->write_slices->count); + grpc_exec_ctx_sched(&exec_ctx, cb, error, NULL); + grpc_exec_ctx_finish(&exec_ctx); +} + +static void uv_endpoint_write(grpc_exec_ctx *exec_ctx, grpc_endpoint *ep, + gpr_slice_buffer *write_slices, + grpc_closure *cb) { + grpc_tcp *tcp = (grpc_tcp *)ep; + uv_buf_t *buffers; + unsigned int buffer_count; + unsigned int i; + gpr_slice *slice; + uv_write_t *write_req; + + if (grpc_tcp_trace) { + size_t j; + + for (j = 0; j < write_slices->count; j++) { + char *data = gpr_dump_slice(write_slices->slices[j], + GPR_DUMP_HEX | GPR_DUMP_ASCII); + gpr_log(GPR_DEBUG, "WRITE %p (peer=%s): %s", tcp, tcp->peer_string, data); + gpr_free(data); + } + } + + if (tcp->shutting_down) { + grpc_exec_ctx_sched(exec_ctx, cb, + GRPC_ERROR_CREATE("TCP socket is shutting down"), NULL); + return; + } + + GPR_ASSERT(tcp->write_cb == NULL); + tcp->write_slices = write_slices; + GPR_ASSERT(tcp->write_slices->count <= UINT_MAX); + if (tcp->write_slices->count == 0) { + // No slices means we don't have to do anything, + // and libuv doesn't like empty writes + grpc_exec_ctx_sched(exec_ctx, cb, GRPC_ERROR_NONE, NULL); + return; + } + + tcp->write_cb = cb; + buffer_count = (unsigned int)tcp->write_slices->count; + buffers = gpr_malloc(sizeof(uv_buf_t) * buffer_count); + grpc_resource_user_alloc(exec_ctx, &tcp->resource_user, + sizeof(uv_buf_t) * buffer_count, NULL); + for (i = 0; i < buffer_count; i++) { + slice = &tcp->write_slices->slices[i]; + buffers[i].base = (char *)GPR_SLICE_START_PTR(*slice); + buffers[i].len = GPR_SLICE_LENGTH(*slice); + } + tcp->write_buffers = buffers; + write_req = &tcp->write_req; + write_req->data = tcp; + TCP_REF(tcp, "write"); + // TODO(murgatroid99): figure out what the return value here means + uv_write(write_req, (uv_stream_t *)tcp->handle, buffers, buffer_count, + write_callback); +} + +static void uv_add_to_pollset(grpc_exec_ctx *exec_ctx, grpc_endpoint *ep, + grpc_pollset *pollset) { + // No-op. We're ignoring pollsets currently + (void)exec_ctx; + (void)ep; + (void)pollset; + grpc_tcp *tcp = (grpc_tcp *)ep; + tcp->pollset = pollset; +} + +static void uv_add_to_pollset_set(grpc_exec_ctx *exec_ctx, grpc_endpoint *ep, + grpc_pollset_set *pollset) { + // No-op. We're ignoring pollsets currently + (void)exec_ctx; + (void)ep; + (void)pollset; +} + +static void shutdown_callback(uv_shutdown_t *req, int status) {} + +static void resource_user_shutdown_done(grpc_exec_ctx *exec_ctx, void *arg, + grpc_error *error) { + TCP_UNREF(arg, "resource_user"); +} + +static void uv_resource_user_maybe_shutdown(grpc_exec_ctx *exec_ctx, + grpc_tcp *tcp) { + if (!tcp->resource_user_shutting_down) { + tcp->resource_user_shutting_down = true; + TCP_REF(tcp, "resource_user"); + grpc_resource_user_shutdown( + exec_ctx, &tcp->resource_user, + grpc_closure_create(resource_user_shutdown_done, tcp)); + } +} + +static void uv_endpoint_shutdown(grpc_exec_ctx *exec_ctx, grpc_endpoint *ep) { + grpc_tcp *tcp = (grpc_tcp *)ep; + if (!tcp->shutting_down) { + tcp->shutting_down = true; + uv_shutdown_t *req = &tcp->shutdown_req; + uv_shutdown(req, (uv_stream_t *)tcp->handle, shutdown_callback); + } +} + +static void uv_destroy(grpc_exec_ctx *exec_ctx, grpc_endpoint *ep) { + grpc_network_status_unregister_endpoint(ep); + grpc_tcp *tcp = (grpc_tcp *)ep; + uv_close((uv_handle_t *)tcp->handle, uv_close_callback); + uv_resource_user_maybe_shutdown(exec_ctx, tcp); + TCP_UNREF(tcp, "destroy"); +} + +static char *uv_get_peer(grpc_endpoint *ep) { + grpc_tcp *tcp = (grpc_tcp *)ep; + return gpr_strdup(tcp->peer_string); +} + +static grpc_resource_user *uv_get_resource_user(grpc_endpoint *ep) { + grpc_tcp *tcp = (grpc_tcp *)ep; + return &tcp->resource_user; +} + +static grpc_workqueue *uv_get_workqueue(grpc_endpoint *ep) { return NULL; } + +static grpc_endpoint_vtable vtable = { + uv_endpoint_read, uv_endpoint_write, uv_get_workqueue, + uv_add_to_pollset, uv_add_to_pollset_set, uv_endpoint_shutdown, + uv_destroy, uv_get_resource_user, uv_get_peer}; + +grpc_endpoint *grpc_tcp_create(uv_tcp_t *handle, + grpc_resource_quota *resource_quota, + char *peer_string) { + grpc_tcp *tcp = (grpc_tcp *)gpr_malloc(sizeof(grpc_tcp)); + + if (grpc_tcp_trace) { + gpr_log(GPR_DEBUG, "Creating TCP endpoint %p", tcp); + } + + /* Disable Nagle's Algorithm */ + uv_tcp_nodelay(handle, 1); + + memset(tcp, 0, sizeof(grpc_tcp)); + tcp->base.vtable = &vtable; + tcp->handle = handle; + handle->data = tcp; + gpr_ref_init(&tcp->refcount, 1); + tcp->peer_string = gpr_strdup(peer_string); + tcp->shutting_down = false; + tcp->resource_user_shutting_down = false; + grpc_resource_user_init(&tcp->resource_user, resource_quota, peer_string); + /* Tell network status tracking code about the new endpoint */ + grpc_network_status_register_endpoint(&tcp->base); + +#ifndef GRPC_UV_TCP_HOLD_LOOP + uv_unref((uv_handle_t *)handle); +#endif + + return &tcp->base; +} + +#endif /* GRPC_UV */ |