diff options
Diffstat (limited to 'src/core/ext/transport/chttp2/server/chttp2_server.cc')
| -rw-r--r-- | src/core/ext/transport/chttp2/server/chttp2_server.cc | 293 |
1 files changed, 293 insertions, 0 deletions
diff --git a/src/core/ext/transport/chttp2/server/chttp2_server.cc b/src/core/ext/transport/chttp2/server/chttp2_server.cc new file mode 100644 index 0000000000..7ac7f4ece8 --- /dev/null +++ b/src/core/ext/transport/chttp2/server/chttp2_server.cc @@ -0,0 +1,293 @@ +/* + * + * 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/ext/transport/chttp2/server/chttp2_server.h" + +#include <grpc/grpc.h> + +#include <inttypes.h> +#include <string.h> + +#include <grpc/support/alloc.h> +#include <grpc/support/log.h> +#include <grpc/support/string_util.h> +#include <grpc/support/sync.h> +#include <grpc/support/useful.h> + +#include "src/core/ext/filters/http/server/http_server_filter.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/endpoint.h" +#include "src/core/lib/iomgr/resolve_address.h" +#include "src/core/lib/iomgr/tcp_server.h" +#include "src/core/lib/slice/slice_internal.h" +#include "src/core/lib/surface/api_trace.h" +#include "src/core/lib/surface/server.h" + +typedef struct { + grpc_server *server; + grpc_tcp_server *tcp_server; + grpc_channel_args *args; + gpr_mu mu; + bool shutdown; + grpc_closure tcp_server_shutdown_complete; + grpc_closure *server_destroy_listener_done; + grpc_handshake_manager *pending_handshake_mgrs; +} server_state; + +typedef struct { + server_state *svr_state; + grpc_pollset *accepting_pollset; + grpc_tcp_server_acceptor *acceptor; + grpc_handshake_manager *handshake_mgr; +} server_connection_state; + +static void on_handshake_done(grpc_exec_ctx *exec_ctx, void *arg, + grpc_error *error) { + grpc_handshaker_args *args = (grpc_handshaker_args *)arg; + server_connection_state *connection_state = + (server_connection_state *)args->user_data; + gpr_mu_lock(&connection_state->svr_state->mu); + if (error != GRPC_ERROR_NONE || connection_state->svr_state->shutdown) { + const char *error_str = grpc_error_string(error); + gpr_log(GPR_DEBUG, "Handshaking failed: %s", error_str); + + if (error == GRPC_ERROR_NONE && args->endpoint != NULL) { + // 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_ERROR_NONE); + 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 { + // If the handshaking succeeded but there is no endpoint, then the + // handshaker may have handed off the connection to some external + // code, so we can just clean up here without creating a transport. + if (args->endpoint != NULL) { + grpc_transport *transport = + grpc_create_chttp2_transport(exec_ctx, args->args, args->endpoint, 0); + grpc_server_setup_transport( + exec_ctx, connection_state->svr_state->server, transport, + connection_state->accepting_pollset, args->args); + grpc_chttp2_transport_start_reading(exec_ctx, transport, + args->read_buffer); + grpc_channel_args_destroy(exec_ctx, args->args); + } + } + grpc_handshake_manager_pending_list_remove( + &connection_state->svr_state->pending_handshake_mgrs, + connection_state->handshake_mgr); + gpr_mu_unlock(&connection_state->svr_state->mu); + grpc_handshake_manager_destroy(exec_ctx, connection_state->handshake_mgr); + grpc_tcp_server_unref(exec_ctx, connection_state->svr_state->tcp_server); + gpr_free(connection_state->acceptor); + gpr_free(connection_state); +} + +static void on_accept(grpc_exec_ctx *exec_ctx, void *arg, grpc_endpoint *tcp, + grpc_pollset *accepting_pollset, + grpc_tcp_server_acceptor *acceptor) { + server_state *state = (server_state *)arg; + gpr_mu_lock(&state->mu); + if (state->shutdown) { + gpr_mu_unlock(&state->mu); + grpc_endpoint_shutdown(exec_ctx, tcp, GRPC_ERROR_NONE); + grpc_endpoint_destroy(exec_ctx, tcp); + gpr_free(acceptor); + return; + } + grpc_handshake_manager *handshake_mgr = grpc_handshake_manager_create(); + grpc_handshake_manager_pending_list_add(&state->pending_handshake_mgrs, + handshake_mgr); + gpr_mu_unlock(&state->mu); + grpc_tcp_server_ref(state->tcp_server); + server_connection_state *connection_state = + (server_connection_state *)gpr_malloc(sizeof(*connection_state)); + connection_state->svr_state = state; + connection_state->accepting_pollset = accepting_pollset; + connection_state->acceptor = acceptor; + connection_state->handshake_mgr = handshake_mgr; + grpc_handshakers_add(exec_ctx, HANDSHAKER_SERVER, state->args, + connection_state->handshake_mgr); + // TODO(roth): We should really get this timeout value from channel + // args instead of hard-coding it. + const grpc_millis deadline = + grpc_exec_ctx_now(exec_ctx) + 120 * GPR_MS_PER_SEC; + grpc_handshake_manager_do_handshake(exec_ctx, connection_state->handshake_mgr, + tcp, state->args, deadline, acceptor, + on_handshake_done, connection_state); +} + +/* Server callback: start listening on our ports */ +static void server_start_listener(grpc_exec_ctx *exec_ctx, grpc_server *server, + void *arg, grpc_pollset **pollsets, + size_t pollset_count) { + server_state *state = (server_state *)arg; + gpr_mu_lock(&state->mu); + state->shutdown = false; + gpr_mu_unlock(&state->mu); + grpc_tcp_server_start(exec_ctx, state->tcp_server, pollsets, pollset_count, + on_accept, state); +} + +static void tcp_server_shutdown_complete(grpc_exec_ctx *exec_ctx, void *arg, + grpc_error *error) { + server_state *state = (server_state *)arg; + /* ensure all threads have unlocked */ + gpr_mu_lock(&state->mu); + grpc_closure *destroy_done = state->server_destroy_listener_done; + GPR_ASSERT(state->shutdown); + grpc_handshake_manager_pending_list_shutdown_all( + exec_ctx, state->pending_handshake_mgrs, GRPC_ERROR_REF(error)); + gpr_mu_unlock(&state->mu); + // Flush queued work before destroying handshaker factory, since that + // may do a synchronous unref. + grpc_exec_ctx_flush(exec_ctx); + if (destroy_done != NULL) { + destroy_done->cb(exec_ctx, destroy_done->cb_arg, GRPC_ERROR_REF(error)); + grpc_exec_ctx_flush(exec_ctx); + } + grpc_channel_args_destroy(exec_ctx, state->args); + gpr_mu_destroy(&state->mu); + gpr_free(state); +} + +/* Server callback: destroy the tcp listener (so we don't generate further + callbacks) */ +static void server_destroy_listener(grpc_exec_ctx *exec_ctx, + grpc_server *server, void *arg, + grpc_closure *destroy_done) { + server_state *state = (server_state *)arg; + gpr_mu_lock(&state->mu); + state->shutdown = true; + state->server_destroy_listener_done = destroy_done; + grpc_tcp_server *tcp_server = state->tcp_server; + gpr_mu_unlock(&state->mu); + grpc_tcp_server_shutdown_listeners(exec_ctx, tcp_server); + grpc_tcp_server_unref(exec_ctx, tcp_server); +} + +grpc_error *grpc_chttp2_server_add_port(grpc_exec_ctx *exec_ctx, + grpc_server *server, const char *addr, + grpc_channel_args *args, + int *port_num) { + grpc_resolved_addresses *resolved = NULL; + grpc_tcp_server *tcp_server = NULL; + size_t i; + size_t count = 0; + int port_temp; + grpc_error *err = GRPC_ERROR_NONE; + server_state *state = NULL; + grpc_error **errors = NULL; + size_t naddrs = 0; + + *port_num = -1; + + /* resolve address */ + err = grpc_blocking_resolve_address(addr, "https", &resolved); + if (err != GRPC_ERROR_NONE) { + goto error; + } + state = (server_state *)gpr_zalloc(sizeof(*state)); + GRPC_CLOSURE_INIT(&state->tcp_server_shutdown_complete, + tcp_server_shutdown_complete, state, + grpc_schedule_on_exec_ctx); + err = grpc_tcp_server_create(exec_ctx, &state->tcp_server_shutdown_complete, + args, &tcp_server); + if (err != GRPC_ERROR_NONE) { + goto error; + } + + state->server = server; + state->tcp_server = tcp_server; + state->args = args; + state->shutdown = true; + gpr_mu_init(&state->mu); + + naddrs = resolved->naddrs; + errors = (grpc_error **)gpr_malloc(sizeof(*errors) * naddrs); + for (i = 0; i < naddrs; i++) { + errors[i] = + grpc_tcp_server_add_port(tcp_server, &resolved->addrs[i], &port_temp); + if (errors[i] == GRPC_ERROR_NONE) { + if (*port_num == -1) { + *port_num = port_temp; + } else { + GPR_ASSERT(*port_num == port_temp); + } + count++; + } + } + if (count == 0) { + char *msg; + gpr_asprintf(&msg, "No address added out of total %" PRIuPTR " resolved", + naddrs); + err = GRPC_ERROR_CREATE_REFERENCING_FROM_COPIED_STRING(msg, errors, naddrs); + gpr_free(msg); + goto error; + } else if (count != naddrs) { + char *msg; + gpr_asprintf(&msg, "Only %" PRIuPTR + " addresses added out of total %" PRIuPTR " resolved", + count, naddrs); + err = GRPC_ERROR_CREATE_REFERENCING_FROM_COPIED_STRING(msg, errors, naddrs); + gpr_free(msg); + + const char *warning_message = grpc_error_string(err); + gpr_log(GPR_INFO, "WARNING: %s", warning_message); + + /* we managed to bind some addresses: continue */ + } + grpc_resolved_addresses_destroy(resolved); + + /* Register with the server only upon success */ + grpc_server_add_listener(exec_ctx, server, state, server_start_listener, + server_destroy_listener); + goto done; + +/* Error path: cleanup and return */ +error: + GPR_ASSERT(err != GRPC_ERROR_NONE); + if (resolved) { + grpc_resolved_addresses_destroy(resolved); + } + if (tcp_server) { + grpc_tcp_server_unref(exec_ctx, tcp_server); + } else { + grpc_channel_args_destroy(exec_ctx, args); + gpr_free(state); + } + *port_num = 0; + +done: + if (errors != NULL) { + for (i = 0; i < naddrs; i++) { + GRPC_ERROR_UNREF(errors[i]); + } + gpr_free(errors); + } + return err; +} |