| /* |
| * |
| * 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/grpc.h> |
| |
| #include <stdlib.h> |
| #include <string.h> |
| |
| #include <grpc/support/alloc.h> |
| #include <grpc/support/slice.h> |
| #include <grpc/support/slice_buffer.h> |
| |
| #include "src/core/census/grpc_filter.h" |
| #include "src/core/channel/channel_args.h" |
| #include "src/core/channel/client_channel.h" |
| #include "src/core/channel/compress_filter.h" |
| #include "src/core/channel/http_client_filter.h" |
| #include "src/core/client_config/resolver_registry.h" |
| #include "src/core/iomgr/tcp_client.h" |
| #include "src/core/surface/api_trace.h" |
| #include "src/core/surface/channel.h" |
| #include "src/core/transport/chttp2_transport.h" |
| |
| typedef struct { |
| grpc_connector base; |
| gpr_refcount refs; |
| |
| grpc_closure *notify; |
| grpc_connect_in_args args; |
| grpc_connect_out_args *result; |
| grpc_closure initial_string_sent; |
| gpr_slice_buffer initial_string_buffer; |
| |
| grpc_endpoint *tcp; |
| |
| grpc_closure connected; |
| } connector; |
| |
| static void connector_ref(grpc_connector *con) { |
| connector *c = (connector *)con; |
| gpr_ref(&c->refs); |
| } |
| |
| static void connector_unref(grpc_exec_ctx *exec_ctx, grpc_connector *con) { |
| connector *c = (connector *)con; |
| if (gpr_unref(&c->refs)) { |
| /* c->initial_string_buffer does not need to be destroyed */ |
| gpr_free(c); |
| } |
| } |
| |
| static void on_initial_connect_string_sent(grpc_exec_ctx *exec_ctx, void *arg, |
| bool success) { |
| connector_unref(exec_ctx, arg); |
| } |
| |
| static void connected(grpc_exec_ctx *exec_ctx, void *arg, bool success) { |
| connector *c = arg; |
| grpc_closure *notify; |
| grpc_endpoint *tcp = c->tcp; |
| if (tcp != NULL) { |
| if (!GPR_SLICE_IS_EMPTY(c->args.initial_connect_string)) { |
| grpc_closure_init(&c->initial_string_sent, on_initial_connect_string_sent, |
| c); |
| gpr_slice_buffer_init(&c->initial_string_buffer); |
| gpr_slice_buffer_add(&c->initial_string_buffer, |
| c->args.initial_connect_string); |
| connector_ref(arg); |
| grpc_endpoint_write(exec_ctx, tcp, &c->initial_string_buffer, |
| &c->initial_string_sent); |
| } |
| c->result->transport = |
| grpc_create_chttp2_transport(exec_ctx, c->args.channel_args, tcp, 1); |
| grpc_chttp2_transport_start_reading(exec_ctx, c->result->transport, NULL, |
| 0); |
| GPR_ASSERT(c->result->transport); |
| c->result->channel_args = c->args.channel_args; |
| c->result->filters = gpr_malloc(sizeof(grpc_channel_filter *)); |
| c->result->filters[0] = &grpc_http_client_filter; |
| c->result->num_filters = 1; |
| } else { |
| memset(c->result, 0, sizeof(*c->result)); |
| } |
| notify = c->notify; |
| c->notify = NULL; |
| notify->cb(exec_ctx, notify->cb_arg, 1); |
| } |
| |
| static void connector_shutdown(grpc_exec_ctx *exec_ctx, grpc_connector *con) {} |
| |
| static void connector_connect(grpc_exec_ctx *exec_ctx, grpc_connector *con, |
| const grpc_connect_in_args *args, |
| grpc_connect_out_args *result, |
| grpc_closure *notify) { |
| connector *c = (connector *)con; |
| GPR_ASSERT(c->notify == NULL); |
| GPR_ASSERT(notify->cb); |
| c->notify = notify; |
| c->args = *args; |
| c->result = result; |
| c->tcp = NULL; |
| grpc_closure_init(&c->connected, connected, c); |
| grpc_tcp_client_connect(exec_ctx, &c->connected, &c->tcp, |
| args->interested_parties, args->addr, args->addr_len, |
| args->deadline); |
| } |
| |
| static const grpc_connector_vtable connector_vtable = { |
| connector_ref, connector_unref, connector_shutdown, connector_connect}; |
| |
| typedef struct { |
| grpc_subchannel_factory base; |
| gpr_refcount refs; |
| grpc_channel_args *merge_args; |
| grpc_channel *master; |
| } subchannel_factory; |
| |
| static void subchannel_factory_ref(grpc_subchannel_factory *scf) { |
| subchannel_factory *f = (subchannel_factory *)scf; |
| gpr_ref(&f->refs); |
| } |
| |
| static void subchannel_factory_unref(grpc_exec_ctx *exec_ctx, |
| grpc_subchannel_factory *scf) { |
| subchannel_factory *f = (subchannel_factory *)scf; |
| if (gpr_unref(&f->refs)) { |
| GRPC_CHANNEL_INTERNAL_UNREF(exec_ctx, f->master, "subchannel_factory"); |
| grpc_channel_args_destroy(f->merge_args); |
| gpr_free(f); |
| } |
| } |
| |
| static grpc_subchannel *subchannel_factory_create_subchannel( |
| grpc_exec_ctx *exec_ctx, grpc_subchannel_factory *scf, |
| grpc_subchannel_args *args) { |
| subchannel_factory *f = (subchannel_factory *)scf; |
| connector *c = gpr_malloc(sizeof(*c)); |
| grpc_channel_args *final_args = |
| grpc_channel_args_merge(args->args, f->merge_args); |
| grpc_subchannel *s; |
| memset(c, 0, sizeof(*c)); |
| c->base.vtable = &connector_vtable; |
| gpr_ref_init(&c->refs, 1); |
| args->args = final_args; |
| s = grpc_subchannel_create(exec_ctx, &c->base, args); |
| grpc_connector_unref(exec_ctx, &c->base); |
| grpc_channel_args_destroy(final_args); |
| return s; |
| } |
| |
| static const grpc_subchannel_factory_vtable subchannel_factory_vtable = { |
| subchannel_factory_ref, subchannel_factory_unref, |
| subchannel_factory_create_subchannel}; |
| |
| /* Create a client channel: |
| Asynchronously: - resolve target |
| - connect to it (trying alternatives as presented) |
| - perform handshakes */ |
| grpc_channel *grpc_insecure_channel_create(const char *target, |
| const grpc_channel_args *args, |
| void *reserved) { |
| grpc_channel *channel = NULL; |
| #define MAX_FILTERS 3 |
| const grpc_channel_filter *filters[MAX_FILTERS]; |
| grpc_resolver *resolver; |
| subchannel_factory *f; |
| grpc_exec_ctx exec_ctx = GRPC_EXEC_CTX_INIT; |
| size_t n = 0; |
| GRPC_API_TRACE( |
| "grpc_insecure_channel_create(target=%p, args=%p, reserved=%p)", 3, |
| (target, args, reserved)); |
| GPR_ASSERT(!reserved); |
| if (grpc_channel_args_is_census_enabled(args)) { |
| filters[n++] = &grpc_client_census_filter; |
| } |
| filters[n++] = &grpc_compress_filter; |
| filters[n++] = &grpc_client_channel_filter; |
| GPR_ASSERT(n <= MAX_FILTERS); |
| |
| channel = |
| grpc_channel_create_from_filters(&exec_ctx, target, filters, n, args, 1); |
| |
| f = gpr_malloc(sizeof(*f)); |
| f->base.vtable = &subchannel_factory_vtable; |
| gpr_ref_init(&f->refs, 1); |
| f->merge_args = grpc_channel_args_copy(args); |
| f->master = channel; |
| GRPC_CHANNEL_INTERNAL_REF(f->master, "subchannel_factory"); |
| resolver = grpc_resolver_create(target, &f->base); |
| if (!resolver) { |
| GRPC_CHANNEL_INTERNAL_UNREF(&exec_ctx, f->master, "subchannel_factory"); |
| grpc_subchannel_factory_unref(&exec_ctx, &f->base); |
| grpc_exec_ctx_finish(&exec_ctx); |
| return NULL; |
| } |
| |
| grpc_client_channel_set_resolver( |
| &exec_ctx, grpc_channel_get_channel_stack(channel), resolver); |
| GRPC_RESOLVER_UNREF(&exec_ctx, resolver, "create"); |
| grpc_subchannel_factory_unref(&exec_ctx, &f->base); |
| |
| grpc_exec_ctx_finish(&exec_ctx); |
| |
| return channel; |
| } |