diff options
Diffstat (limited to 'src/core/ext/transport/chttp2/client/chttp2_connector.c')
| -rw-r--r-- | src/core/ext/transport/chttp2/client/chttp2_connector.c | 253 |
1 files changed, 253 insertions, 0 deletions
diff --git a/src/core/ext/transport/chttp2/client/chttp2_connector.c b/src/core/ext/transport/chttp2/client/chttp2_connector.c new file mode 100644 index 0000000000..013c96dc70 --- /dev/null +++ b/src/core/ext/transport/chttp2/client/chttp2_connector.c @@ -0,0 +1,253 @@ +/* + * + * Copyright 2015, 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/ext/transport/chttp2/client/chttp2_connector.h" + +#include <grpc/grpc.h> + +#include <string.h> + +#include <grpc/slice_buffer.h> +#include <grpc/support/alloc.h> +#include <grpc/support/string_util.h> + +#include "src/core/ext/client_channel/connector.h" +#include "src/core/ext/client_channel/http_connect_handshaker.h" +#include "src/core/ext/client_channel/subchannel.h" +#include "src/core/ext/transport/chttp2/transport/chttp2_transport.h" +#include "src/core/lib/channel/channel_args.h" +#include "src/core/lib/channel/handshaker.h" +#include "src/core/lib/channel/handshaker_registry.h" +#include "src/core/lib/iomgr/tcp_client.h" +#include "src/core/lib/slice/slice_internal.h" + +typedef struct { + grpc_connector base; + + gpr_mu mu; + gpr_refcount refs; + + bool shutdown; + bool connecting; + + grpc_closure *notify; + grpc_connect_in_args args; + grpc_connect_out_args *result; + grpc_closure initial_string_sent; + grpc_slice_buffer initial_string_buffer; + + grpc_endpoint *endpoint; // Non-NULL until handshaking starts. + + grpc_closure connected; + + grpc_handshake_manager *handshake_mgr; +} chttp2_connector; + +static void chttp2_connector_ref(grpc_connector *con) { + chttp2_connector *c = (chttp2_connector *)con; + gpr_ref(&c->refs); +} + +static void chttp2_connector_unref(grpc_exec_ctx *exec_ctx, + grpc_connector *con) { + chttp2_connector *c = (chttp2_connector *)con; + if (gpr_unref(&c->refs)) { + /* c->initial_string_buffer does not need to be destroyed */ + gpr_mu_destroy(&c->mu); + // If handshaking is not yet in progress, destroy the endpoint. + // Otherwise, the handshaker will do this for us. + if (c->endpoint != NULL) grpc_endpoint_destroy(exec_ctx, c->endpoint); + gpr_free(c); + } +} + +static void chttp2_connector_shutdown(grpc_exec_ctx *exec_ctx, + grpc_connector *con) { + chttp2_connector *c = (chttp2_connector *)con; + gpr_mu_lock(&c->mu); + c->shutdown = true; + if (c->handshake_mgr != NULL) { + grpc_handshake_manager_shutdown(exec_ctx, c->handshake_mgr); + } + // If handshaking is not yet in progress, shutdown the endpoint. + // Otherwise, the handshaker will do this for us. + if (!c->connecting && c->endpoint != NULL) { + grpc_endpoint_shutdown(exec_ctx, c->endpoint); + } + gpr_mu_unlock(&c->mu); +} + +static void on_handshake_done(grpc_exec_ctx *exec_ctx, void *arg, + grpc_error *error) { + grpc_handshaker_args *args = arg; + chttp2_connector *c = args->user_data; + gpr_mu_lock(&c->mu); + if (error != GRPC_ERROR_NONE || c->shutdown) { + if (error == GRPC_ERROR_NONE) { + error = GRPC_ERROR_CREATE("connector shutdown"); + // We were shut down after handshaking completed successfully, so + // destroy the endpoint here. + // TODO(ctiller): It is currently necessary to shutdown endpoints + // before destroying them, even if we know that there are no + // pending read/write callbacks. This should be fixed, at which + // point this can be removed. + grpc_endpoint_shutdown(exec_ctx, args->endpoint); + grpc_endpoint_destroy(exec_ctx, args->endpoint); + grpc_channel_args_destroy(exec_ctx, args->args); + grpc_slice_buffer_destroy_internal(exec_ctx, args->read_buffer); + gpr_free(args->read_buffer); + } else { + error = GRPC_ERROR_REF(error); + } + memset(c->result, 0, sizeof(*c->result)); + } else { + c->result->transport = + grpc_create_chttp2_transport(exec_ctx, args->args, args->endpoint, 1); + GPR_ASSERT(c->result->transport); + grpc_chttp2_transport_start_reading(exec_ctx, c->result->transport, + args->read_buffer); + c->result->channel_args = args->args; + } + grpc_closure *notify = c->notify; + c->notify = NULL; + grpc_closure_sched(exec_ctx, notify, error); + grpc_handshake_manager_destroy(exec_ctx, c->handshake_mgr); + c->handshake_mgr = NULL; + gpr_mu_unlock(&c->mu); + chttp2_connector_unref(exec_ctx, (grpc_connector *)c); +} + +static void start_handshake_locked(grpc_exec_ctx *exec_ctx, + chttp2_connector *c) { + c->handshake_mgr = grpc_handshake_manager_create(); + grpc_handshakers_add(exec_ctx, HANDSHAKER_CLIENT, c->args.channel_args, + c->handshake_mgr); + grpc_handshake_manager_do_handshake( + exec_ctx, c->handshake_mgr, c->endpoint, c->args.channel_args, + c->args.deadline, NULL /* acceptor */, on_handshake_done, c); + c->endpoint = NULL; // Endpoint handed off to handshake manager. +} + +static void on_initial_connect_string_sent(grpc_exec_ctx *exec_ctx, void *arg, + grpc_error *error) { + chttp2_connector *c = arg; + gpr_mu_lock(&c->mu); + if (error != GRPC_ERROR_NONE || c->shutdown) { + if (error == GRPC_ERROR_NONE) { + error = GRPC_ERROR_CREATE("connector shutdown"); + } else { + error = GRPC_ERROR_REF(error); + } + memset(c->result, 0, sizeof(*c->result)); + grpc_closure *notify = c->notify; + c->notify = NULL; + grpc_closure_sched(exec_ctx, notify, error); + gpr_mu_unlock(&c->mu); + chttp2_connector_unref(exec_ctx, arg); + } else { + start_handshake_locked(exec_ctx, c); + gpr_mu_unlock(&c->mu); + } +} + +static void connected(grpc_exec_ctx *exec_ctx, void *arg, grpc_error *error) { + chttp2_connector *c = arg; + gpr_mu_lock(&c->mu); + GPR_ASSERT(c->connecting); + c->connecting = false; + if (error != GRPC_ERROR_NONE || c->shutdown) { + if (error == GRPC_ERROR_NONE) { + error = GRPC_ERROR_CREATE("connector shutdown"); + } else { + error = GRPC_ERROR_REF(error); + } + memset(c->result, 0, sizeof(*c->result)); + grpc_closure *notify = c->notify; + c->notify = NULL; + grpc_closure_sched(exec_ctx, notify, error); + if (c->endpoint != NULL) grpc_endpoint_shutdown(exec_ctx, c->endpoint); + gpr_mu_unlock(&c->mu); + chttp2_connector_unref(exec_ctx, arg); + } else { + GPR_ASSERT(c->endpoint != NULL); + if (!GRPC_SLICE_IS_EMPTY(c->args.initial_connect_string)) { + grpc_closure_init(&c->initial_string_sent, on_initial_connect_string_sent, + c, grpc_schedule_on_exec_ctx); + grpc_slice_buffer_init(&c->initial_string_buffer); + grpc_slice_buffer_add(&c->initial_string_buffer, + c->args.initial_connect_string); + grpc_endpoint_write(exec_ctx, c->endpoint, &c->initial_string_buffer, + &c->initial_string_sent); + } else { + start_handshake_locked(exec_ctx, c); + } + gpr_mu_unlock(&c->mu); + } +} + +static void chttp2_connector_connect(grpc_exec_ctx *exec_ctx, + grpc_connector *con, + const grpc_connect_in_args *args, + grpc_connect_out_args *result, + grpc_closure *notify) { + chttp2_connector *c = (chttp2_connector *)con; + grpc_resolved_address addr; + grpc_get_subchannel_address_arg(args->channel_args, &addr); + gpr_mu_lock(&c->mu); + GPR_ASSERT(c->notify == NULL); + c->notify = notify; + c->args = *args; + c->result = result; + GPR_ASSERT(c->endpoint == NULL); + chttp2_connector_ref(con); // Ref taken for callback. + grpc_closure_init(&c->connected, connected, c, grpc_schedule_on_exec_ctx); + GPR_ASSERT(!c->connecting); + c->connecting = true; + grpc_tcp_client_connect(exec_ctx, &c->connected, &c->endpoint, + args->interested_parties, args->channel_args, &addr, + args->deadline); + gpr_mu_unlock(&c->mu); +} + +static const grpc_connector_vtable chttp2_connector_vtable = { + chttp2_connector_ref, chttp2_connector_unref, chttp2_connector_shutdown, + chttp2_connector_connect}; + +grpc_connector *grpc_chttp2_connector_create() { + chttp2_connector *c = gpr_malloc(sizeof(*c)); + memset(c, 0, sizeof(*c)); + c->base.vtable = &chttp2_connector_vtable; + gpr_mu_init(&c->mu); + gpr_ref_init(&c->refs, 1); + return &c->base; +} |