| /* |
| * |
| * 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/surface/server.h" |
| |
| #include <stdlib.h> |
| #include <string.h> |
| |
| #include "src/core/channel/census_filter.h" |
| #include "src/core/channel/channel_args.h" |
| #include "src/core/channel/connected_channel.h" |
| #include "src/core/iomgr/iomgr.h" |
| #include "src/core/support/string.h" |
| #include "src/core/surface/call.h" |
| #include "src/core/surface/channel.h" |
| #include "src/core/surface/completion_queue.h" |
| #include "src/core/surface/init.h" |
| #include "src/core/transport/metadata.h" |
| #include <grpc/support/alloc.h> |
| #include <grpc/support/log.h> |
| #include <grpc/support/string_util.h> |
| #include <grpc/support/useful.h> |
| |
| typedef enum { PENDING_START, CALL_LIST_COUNT } call_list; |
| |
| typedef struct listener { |
| void *arg; |
| void (*start)(grpc_server *server, void *arg, grpc_pollset **pollsets, |
| size_t pollset_count); |
| void (*destroy)(grpc_server *server, void *arg); |
| struct listener *next; |
| } listener; |
| |
| typedef struct call_data call_data; |
| typedef struct channel_data channel_data; |
| typedef struct registered_method registered_method; |
| |
| typedef struct { |
| call_data *next; |
| call_data *prev; |
| } call_link; |
| |
| typedef enum { BATCH_CALL, REGISTERED_CALL } requested_call_type; |
| |
| typedef struct { |
| requested_call_type type; |
| void *tag; |
| grpc_completion_queue *cq_bound_to_call; |
| grpc_completion_queue *cq_for_notification; |
| grpc_call **call; |
| union { |
| struct { |
| grpc_call_details *details; |
| grpc_metadata_array *initial_metadata; |
| } batch; |
| struct { |
| registered_method *registered_method; |
| gpr_timespec *deadline; |
| grpc_metadata_array *initial_metadata; |
| grpc_byte_buffer **optional_payload; |
| } registered; |
| } data; |
| } requested_call; |
| |
| typedef struct { |
| requested_call *calls; |
| size_t count; |
| size_t capacity; |
| } requested_call_array; |
| |
| struct registered_method { |
| char *method; |
| char *host; |
| call_data *pending; |
| requested_call_array requested; |
| registered_method *next; |
| }; |
| |
| typedef struct channel_registered_method { |
| registered_method *server_registered_method; |
| grpc_mdstr *method; |
| grpc_mdstr *host; |
| } channel_registered_method; |
| |
| struct channel_data { |
| grpc_server *server; |
| grpc_connectivity_state connectivity_state; |
| grpc_channel *channel; |
| grpc_mdstr *path_key; |
| grpc_mdstr *authority_key; |
| /* linked list of all channels on a server */ |
| channel_data *next; |
| channel_data *prev; |
| channel_registered_method *registered_methods; |
| gpr_uint32 registered_method_slots; |
| gpr_uint32 registered_method_max_probes; |
| grpc_iomgr_closure finish_destroy_channel_closure; |
| grpc_iomgr_closure channel_connectivity_changed; |
| }; |
| |
| typedef struct shutdown_tag { |
| void *tag; |
| grpc_completion_queue *cq; |
| } shutdown_tag; |
| |
| struct grpc_server { |
| size_t channel_filter_count; |
| const grpc_channel_filter **channel_filters; |
| grpc_channel_args *channel_args; |
| |
| grpc_completion_queue **cqs; |
| grpc_pollset **pollsets; |
| size_t cq_count; |
| |
| /* The two following mutexes control access to server-state |
| mu_global controls access to non-call-related state (e.g., channel state) |
| mu_call controls access to call-related state (e.g., the call lists) |
| |
| If they are ever required to be nested, you must lock mu_global |
| before mu_call. This is currently used in shutdown processing |
| (grpc_server_shutdown_and_notify and maybe_finish_shutdown) */ |
| gpr_mu mu_global; /* mutex for server and channel state */ |
| gpr_mu mu_call; /* mutex for call-specific state */ |
| |
| registered_method *registered_methods; |
| requested_call_array requested_calls; |
| |
| gpr_uint8 shutdown; |
| gpr_uint8 shutdown_published; |
| size_t num_shutdown_tags; |
| shutdown_tag *shutdown_tags; |
| |
| call_data *lists[CALL_LIST_COUNT]; |
| channel_data root_channel_data; |
| |
| listener *listeners; |
| int listeners_destroyed; |
| gpr_refcount internal_refcount; |
| }; |
| |
| typedef enum { |
| /* waiting for metadata */ |
| NOT_STARTED, |
| /* inital metadata read, not flow controlled in yet */ |
| PENDING, |
| /* flow controlled in, on completion queue */ |
| ACTIVATED, |
| /* cancelled before being queued */ |
| ZOMBIED |
| } call_state; |
| |
| struct call_data { |
| grpc_call *call; |
| |
| call_state state; |
| grpc_mdstr *path; |
| grpc_mdstr *host; |
| gpr_timespec deadline; |
| int got_initial_metadata; |
| |
| grpc_completion_queue *cq_new; |
| |
| grpc_stream_op_buffer *recv_ops; |
| grpc_stream_state *recv_state; |
| grpc_iomgr_closure *on_done_recv; |
| |
| grpc_iomgr_closure server_on_recv; |
| grpc_iomgr_closure kill_zombie_closure; |
| |
| call_data **root[CALL_LIST_COUNT]; |
| call_link links[CALL_LIST_COUNT]; |
| }; |
| |
| typedef struct { |
| grpc_channel **channels; |
| size_t num_channels; |
| } channel_broadcaster; |
| |
| #define SERVER_FROM_CALL_ELEM(elem) \ |
| (((channel_data *)(elem)->channel_data)->server) |
| |
| static void begin_call(grpc_server *server, call_data *calld, |
| requested_call *rc); |
| static void fail_call(grpc_server *server, requested_call *rc); |
| /* Before calling maybe_finish_shutdown, we must hold mu_global and not |
| hold mu_call */ |
| static void maybe_finish_shutdown(grpc_server *server); |
| |
| /* channel broadcaster */ |
| |
| /* assumes server locked */ |
| static void channel_broadcaster_init(grpc_server *s, channel_broadcaster *cb) { |
| channel_data *c; |
| size_t count = 0; |
| for (c = s->root_channel_data.next; c != &s->root_channel_data; c = c->next) { |
| count++; |
| } |
| cb->num_channels = count; |
| cb->channels = gpr_malloc(sizeof(*cb->channels) * cb->num_channels); |
| count = 0; |
| for (c = s->root_channel_data.next; c != &s->root_channel_data; c = c->next) { |
| cb->channels[count++] = c->channel; |
| GRPC_CHANNEL_INTERNAL_REF(c->channel, "broadcast"); |
| } |
| } |
| |
| struct shutdown_cleanup_args { |
| grpc_iomgr_closure closure; |
| gpr_slice slice; |
| }; |
| |
| static void shutdown_cleanup(void *arg, int iomgr_status_ignored) { |
| struct shutdown_cleanup_args *a = arg; |
| gpr_slice_unref(a->slice); |
| gpr_free(a); |
| } |
| |
| static void send_shutdown(grpc_channel *channel, int send_goaway, |
| int send_disconnect) { |
| grpc_transport_op op; |
| struct shutdown_cleanup_args *sc; |
| grpc_channel_element *elem; |
| |
| memset(&op, 0, sizeof(op)); |
| op.send_goaway = send_goaway; |
| sc = gpr_malloc(sizeof(*sc)); |
| sc->slice = gpr_slice_from_copied_string("Server shutdown"); |
| op.goaway_message = &sc->slice; |
| op.goaway_status = GRPC_STATUS_OK; |
| op.disconnect = send_disconnect; |
| grpc_iomgr_closure_init(&sc->closure, shutdown_cleanup, sc); |
| op.on_consumed = &sc->closure; |
| |
| elem = grpc_channel_stack_element(grpc_channel_get_channel_stack(channel), 0); |
| elem->filter->start_transport_op(elem, &op); |
| } |
| |
| static void channel_broadcaster_shutdown(channel_broadcaster *cb, |
| int send_goaway, int force_disconnect) { |
| size_t i; |
| |
| for (i = 0; i < cb->num_channels; i++) { |
| send_shutdown(cb->channels[i], send_goaway, force_disconnect); |
| GRPC_CHANNEL_INTERNAL_UNREF(cb->channels[i], "broadcast"); |
| } |
| gpr_free(cb->channels); |
| } |
| |
| /* call list */ |
| |
| static int call_list_join(call_data **root, call_data *call, call_list list) { |
| GPR_ASSERT(!call->root[list]); |
| call->root[list] = root; |
| if (!*root) { |
| *root = call; |
| call->links[list].next = call->links[list].prev = call; |
| } else { |
| call->links[list].next = *root; |
| call->links[list].prev = (*root)->links[list].prev; |
| call->links[list].next->links[list].prev = |
| call->links[list].prev->links[list].next = call; |
| } |
| return 1; |
| } |
| |
| static call_data *call_list_remove_head(call_data **root, call_list list) { |
| call_data *out = *root; |
| if (out) { |
| out->root[list] = NULL; |
| if (out->links[list].next == out) { |
| *root = NULL; |
| } else { |
| *root = out->links[list].next; |
| out->links[list].next->links[list].prev = out->links[list].prev; |
| out->links[list].prev->links[list].next = out->links[list].next; |
| } |
| } |
| return out; |
| } |
| |
| static int call_list_remove(call_data *call, call_list list) { |
| call_data **root = call->root[list]; |
| if (root == NULL) return 0; |
| call->root[list] = NULL; |
| if (*root == call) { |
| *root = call->links[list].next; |
| if (*root == call) { |
| *root = NULL; |
| return 1; |
| } |
| } |
| GPR_ASSERT(*root != call); |
| call->links[list].next->links[list].prev = call->links[list].prev; |
| call->links[list].prev->links[list].next = call->links[list].next; |
| return 1; |
| } |
| |
| static void requested_call_array_destroy(requested_call_array *array) { |
| gpr_free(array->calls); |
| } |
| |
| static requested_call *requested_call_array_add(requested_call_array *array) { |
| requested_call *rc; |
| if (array->count == array->capacity) { |
| array->capacity = GPR_MAX(array->capacity + 8, array->capacity * 2); |
| array->calls = |
| gpr_realloc(array->calls, sizeof(requested_call) * array->capacity); |
| } |
| rc = &array->calls[array->count++]; |
| memset(rc, 0, sizeof(*rc)); |
| return rc; |
| } |
| |
| static void server_ref(grpc_server *server) { |
| gpr_ref(&server->internal_refcount); |
| } |
| |
| static void server_delete(grpc_server *server) { |
| registered_method *rm; |
| size_t i; |
| grpc_channel_args_destroy(server->channel_args); |
| gpr_mu_destroy(&server->mu_global); |
| gpr_mu_destroy(&server->mu_call); |
| gpr_free(server->channel_filters); |
| requested_call_array_destroy(&server->requested_calls); |
| while ((rm = server->registered_methods) != NULL) { |
| server->registered_methods = rm->next; |
| gpr_free(rm->method); |
| gpr_free(rm->host); |
| requested_call_array_destroy(&rm->requested); |
| gpr_free(rm); |
| } |
| for (i = 0; i < server->cq_count; i++) { |
| GRPC_CQ_INTERNAL_UNREF(server->cqs[i], "server"); |
| } |
| gpr_free(server->cqs); |
| gpr_free(server->pollsets); |
| gpr_free(server->shutdown_tags); |
| gpr_free(server); |
| } |
| |
| static void server_unref(grpc_server *server) { |
| if (gpr_unref(&server->internal_refcount)) { |
| server_delete(server); |
| } |
| } |
| |
| static int is_channel_orphaned(channel_data *chand) { |
| return chand->next == chand; |
| } |
| |
| static void orphan_channel(channel_data *chand) { |
| chand->next->prev = chand->prev; |
| chand->prev->next = chand->next; |
| chand->next = chand->prev = chand; |
| } |
| |
| static void finish_destroy_channel(void *cd, int success) { |
| channel_data *chand = cd; |
| grpc_server *server = chand->server; |
| GRPC_CHANNEL_INTERNAL_UNREF(chand->channel, "server"); |
| server_unref(server); |
| } |
| |
| static void destroy_channel(channel_data *chand) { |
| if (is_channel_orphaned(chand)) return; |
| GPR_ASSERT(chand->server != NULL); |
| orphan_channel(chand); |
| server_ref(chand->server); |
| maybe_finish_shutdown(chand->server); |
| chand->finish_destroy_channel_closure.cb = finish_destroy_channel; |
| chand->finish_destroy_channel_closure.cb_arg = chand; |
| grpc_iomgr_add_callback(&chand->finish_destroy_channel_closure); |
| } |
| |
| static void finish_start_new_rpc_and_unlock(grpc_server *server, |
| grpc_call_element *elem, |
| call_data **pending_root, |
| requested_call_array *array) { |
| requested_call rc; |
| call_data *calld = elem->call_data; |
| if (array->count == 0) { |
| calld->state = PENDING; |
| call_list_join(pending_root, calld, PENDING_START); |
| gpr_mu_unlock(&server->mu_call); |
| } else { |
| rc = array->calls[--array->count]; |
| calld->state = ACTIVATED; |
| gpr_mu_unlock(&server->mu_call); |
| begin_call(server, calld, &rc); |
| } |
| } |
| |
| static void start_new_rpc(grpc_call_element *elem) { |
| channel_data *chand = elem->channel_data; |
| call_data *calld = elem->call_data; |
| grpc_server *server = chand->server; |
| gpr_uint32 i; |
| gpr_uint32 hash; |
| channel_registered_method *rm; |
| |
| gpr_mu_lock(&server->mu_call); |
| if (chand->registered_methods && calld->path && calld->host) { |
| /* TODO(ctiller): unify these two searches */ |
| /* check for an exact match with host */ |
| hash = GRPC_MDSTR_KV_HASH(calld->host->hash, calld->path->hash); |
| for (i = 0; i < chand->registered_method_max_probes; i++) { |
| rm = &chand->registered_methods[(hash + i) % |
| chand->registered_method_slots]; |
| if (!rm) break; |
| if (rm->host != calld->host) continue; |
| if (rm->method != calld->path) continue; |
| finish_start_new_rpc_and_unlock(server, elem, |
| &rm->server_registered_method->pending, |
| &rm->server_registered_method->requested); |
| return; |
| } |
| /* check for a wildcard method definition (no host set) */ |
| hash = GRPC_MDSTR_KV_HASH(0, calld->path->hash); |
| for (i = 0; i <= chand->registered_method_max_probes; i++) { |
| rm = &chand->registered_methods[(hash + i) % |
| chand->registered_method_slots]; |
| if (!rm) break; |
| if (rm->host != NULL) continue; |
| if (rm->method != calld->path) continue; |
| finish_start_new_rpc_and_unlock(server, elem, |
| &rm->server_registered_method->pending, |
| &rm->server_registered_method->requested); |
| return; |
| } |
| } |
| finish_start_new_rpc_and_unlock(server, elem, &server->lists[PENDING_START], |
| &server->requested_calls); |
| } |
| |
| static void kill_zombie(void *elem, int success) { |
| grpc_call_destroy(grpc_call_from_top_element(elem)); |
| } |
| |
| static int num_listeners(grpc_server *server) { |
| listener *l; |
| int n = 0; |
| for (l = server->listeners; l; l = l->next) { |
| n++; |
| } |
| return n; |
| } |
| |
| static void maybe_finish_shutdown(grpc_server *server) { |
| size_t i; |
| if (!server->shutdown || server->shutdown_published) { |
| return; |
| } |
| |
| if (server->root_channel_data.next != &server->root_channel_data) { |
| gpr_log(GPR_DEBUG, |
| "Waiting for all channels to close before destroying server"); |
| return; |
| } |
| if (server->listeners_destroyed < num_listeners(server)) { |
| gpr_log(GPR_DEBUG, "Waiting for all listeners to be destroyed (@ %d/%d)", |
| server->listeners_destroyed, num_listeners(server)); |
| return; |
| } |
| server->shutdown_published = 1; |
| for (i = 0; i < server->num_shutdown_tags; i++) { |
| grpc_cq_end_op(server->shutdown_tags[i].cq, server->shutdown_tags[i].tag, |
| NULL, 1); |
| } |
| } |
| |
| static grpc_mdelem *server_filter(void *user_data, grpc_mdelem *md) { |
| grpc_call_element *elem = user_data; |
| channel_data *chand = elem->channel_data; |
| call_data *calld = elem->call_data; |
| if (md->key == chand->path_key) { |
| calld->path = grpc_mdstr_ref(md->value); |
| return NULL; |
| } else if (md->key == chand->authority_key) { |
| calld->host = grpc_mdstr_ref(md->value); |
| return NULL; |
| } |
| return md; |
| } |
| |
| static void server_on_recv(void *ptr, int success) { |
| grpc_call_element *elem = ptr; |
| call_data *calld = elem->call_data; |
| channel_data *chand = elem->channel_data; |
| |
| if (success && !calld->got_initial_metadata) { |
| size_t i; |
| size_t nops = calld->recv_ops->nops; |
| grpc_stream_op *ops = calld->recv_ops->ops; |
| for (i = 0; i < nops; i++) { |
| grpc_stream_op *op = &ops[i]; |
| if (op->type != GRPC_OP_METADATA) continue; |
| grpc_metadata_batch_filter(&op->data.metadata, server_filter, elem); |
| if (0 != gpr_time_cmp(op->data.metadata.deadline, gpr_inf_future)) { |
| calld->deadline = op->data.metadata.deadline; |
| } |
| calld->got_initial_metadata = 1; |
| start_new_rpc(elem); |
| break; |
| } |
| } |
| |
| switch (*calld->recv_state) { |
| case GRPC_STREAM_OPEN: |
| break; |
| case GRPC_STREAM_SEND_CLOSED: |
| break; |
| case GRPC_STREAM_RECV_CLOSED: |
| gpr_mu_lock(&chand->server->mu_call); |
| if (calld->state == NOT_STARTED) { |
| calld->state = ZOMBIED; |
| grpc_iomgr_closure_init(&calld->kill_zombie_closure, kill_zombie, elem); |
| grpc_iomgr_add_callback(&calld->kill_zombie_closure); |
| } |
| gpr_mu_unlock(&chand->server->mu_call); |
| break; |
| case GRPC_STREAM_CLOSED: |
| gpr_mu_lock(&chand->server->mu_call); |
| if (calld->state == NOT_STARTED) { |
| calld->state = ZOMBIED; |
| grpc_iomgr_closure_init(&calld->kill_zombie_closure, kill_zombie, elem); |
| grpc_iomgr_add_callback(&calld->kill_zombie_closure); |
| } else if (calld->state == PENDING) { |
| call_list_remove(calld, PENDING_START); |
| calld->state = ZOMBIED; |
| grpc_iomgr_closure_init(&calld->kill_zombie_closure, kill_zombie, elem); |
| grpc_iomgr_add_callback(&calld->kill_zombie_closure); |
| } |
| gpr_mu_unlock(&chand->server->mu_call); |
| break; |
| } |
| |
| calld->on_done_recv->cb(calld->on_done_recv->cb_arg, success); |
| } |
| |
| static void server_mutate_op(grpc_call_element *elem, |
| grpc_transport_stream_op *op) { |
| call_data *calld = elem->call_data; |
| |
| if (op->recv_ops) { |
| /* substitute our callback for the higher callback */ |
| calld->recv_ops = op->recv_ops; |
| calld->recv_state = op->recv_state; |
| calld->on_done_recv = op->on_done_recv; |
| op->on_done_recv = &calld->server_on_recv; |
| } |
| } |
| |
| static void server_start_transport_stream_op(grpc_call_element *elem, |
| grpc_transport_stream_op *op) { |
| GRPC_CALL_LOG_OP(GPR_INFO, elem, op); |
| server_mutate_op(elem, op); |
| grpc_call_next_op(elem, op); |
| } |
| |
| static void accept_stream(void *cd, grpc_transport *transport, |
| const void *transport_server_data) { |
| channel_data *chand = cd; |
| /* create a call */ |
| grpc_call_create(chand->channel, NULL, transport_server_data, NULL, 0, |
| gpr_inf_future); |
| } |
| |
| static void channel_connectivity_changed(void *cd, int iomgr_status_ignored) { |
| channel_data *chand = cd; |
| grpc_server *server = chand->server; |
| if (chand->connectivity_state != GRPC_CHANNEL_FATAL_FAILURE) { |
| grpc_transport_op op; |
| memset(&op, 0, sizeof(op)); |
| op.on_connectivity_state_change = &chand->channel_connectivity_changed, |
| op.connectivity_state = &chand->connectivity_state; |
| grpc_channel_next_op(grpc_channel_stack_element( |
| grpc_channel_get_channel_stack(chand->channel), 0), |
| &op); |
| } else { |
| gpr_mu_lock(&server->mu_global); |
| destroy_channel(chand); |
| gpr_mu_unlock(&server->mu_global); |
| GRPC_CHANNEL_INTERNAL_UNREF(chand->channel, "connectivity"); |
| } |
| } |
| |
| static void init_call_elem(grpc_call_element *elem, |
| const void *server_transport_data, |
| grpc_transport_stream_op *initial_op) { |
| call_data *calld = elem->call_data; |
| channel_data *chand = elem->channel_data; |
| memset(calld, 0, sizeof(call_data)); |
| calld->deadline = gpr_inf_future; |
| calld->call = grpc_call_from_top_element(elem); |
| |
| grpc_iomgr_closure_init(&calld->server_on_recv, server_on_recv, elem); |
| |
| server_ref(chand->server); |
| |
| if (initial_op) server_mutate_op(elem, initial_op); |
| } |
| |
| static void destroy_call_elem(grpc_call_element *elem) { |
| channel_data *chand = elem->channel_data; |
| call_data *calld = elem->call_data; |
| size_t i; |
| |
| gpr_mu_lock(&chand->server->mu_call); |
| for (i = 0; i < CALL_LIST_COUNT; i++) { |
| call_list_remove(elem->call_data, i); |
| } |
| gpr_mu_unlock(&chand->server->mu_call); |
| |
| if (calld->host) { |
| grpc_mdstr_unref(calld->host); |
| } |
| if (calld->path) { |
| grpc_mdstr_unref(calld->path); |
| } |
| |
| server_unref(chand->server); |
| } |
| |
| static void init_channel_elem(grpc_channel_element *elem, grpc_channel *master, |
| const grpc_channel_args *args, |
| grpc_mdctx *metadata_context, int is_first, |
| int is_last) { |
| channel_data *chand = elem->channel_data; |
| GPR_ASSERT(is_first); |
| GPR_ASSERT(!is_last); |
| chand->server = NULL; |
| chand->channel = NULL; |
| chand->path_key = grpc_mdstr_from_string(metadata_context, ":path"); |
| chand->authority_key = grpc_mdstr_from_string(metadata_context, ":authority"); |
| chand->next = chand->prev = chand; |
| chand->registered_methods = NULL; |
| chand->connectivity_state = GRPC_CHANNEL_IDLE; |
| grpc_iomgr_closure_init(&chand->channel_connectivity_changed, |
| channel_connectivity_changed, chand); |
| } |
| |
| static void destroy_channel_elem(grpc_channel_element *elem) { |
| size_t i; |
| channel_data *chand = elem->channel_data; |
| if (chand->registered_methods) { |
| for (i = 0; i < chand->registered_method_slots; i++) { |
| if (chand->registered_methods[i].method) { |
| grpc_mdstr_unref(chand->registered_methods[i].method); |
| } |
| if (chand->registered_methods[i].host) { |
| grpc_mdstr_unref(chand->registered_methods[i].host); |
| } |
| } |
| gpr_free(chand->registered_methods); |
| } |
| if (chand->server) { |
| gpr_mu_lock(&chand->server->mu_global); |
| chand->next->prev = chand->prev; |
| chand->prev->next = chand->next; |
| chand->next = chand->prev = chand; |
| maybe_finish_shutdown(chand->server); |
| gpr_mu_unlock(&chand->server->mu_global); |
| grpc_mdstr_unref(chand->path_key); |
| grpc_mdstr_unref(chand->authority_key); |
| server_unref(chand->server); |
| } |
| } |
| |
| static const grpc_channel_filter server_surface_filter = { |
| server_start_transport_stream_op, |
| grpc_channel_next_op, |
| sizeof(call_data), |
| init_call_elem, |
| destroy_call_elem, |
| sizeof(channel_data), |
| init_channel_elem, |
| destroy_channel_elem, |
| "server", |
| }; |
| |
| void grpc_server_register_completion_queue(grpc_server *server, |
| grpc_completion_queue *cq) { |
| size_t i, n; |
| for (i = 0; i < server->cq_count; i++) { |
| if (server->cqs[i] == cq) return; |
| } |
| GRPC_CQ_INTERNAL_REF(cq, "server"); |
| grpc_cq_mark_server_cq(cq); |
| n = server->cq_count++; |
| server->cqs = gpr_realloc(server->cqs, |
| server->cq_count * sizeof(grpc_completion_queue *)); |
| server->cqs[n] = cq; |
| } |
| |
| grpc_server *grpc_server_create_from_filters(grpc_channel_filter **filters, |
| size_t filter_count, |
| const grpc_channel_args *args) { |
| size_t i; |
| /* TODO(census): restore this once we finalize census filter etc. |
| int census_enabled = grpc_channel_args_is_census_enabled(args); */ |
| int census_enabled = 0; |
| |
| grpc_server *server = gpr_malloc(sizeof(grpc_server)); |
| |
| GPR_ASSERT(grpc_is_initialized() && "call grpc_init()"); |
| |
| memset(server, 0, sizeof(grpc_server)); |
| |
| gpr_mu_init(&server->mu_global); |
| gpr_mu_init(&server->mu_call); |
| |
| /* decremented by grpc_server_destroy */ |
| gpr_ref_init(&server->internal_refcount, 1); |
| server->root_channel_data.next = server->root_channel_data.prev = |
| &server->root_channel_data; |
| |
| /* Server filter stack is: |
| |
| server_surface_filter - for making surface API calls |
| grpc_server_census_filter (optional) - for stats collection and tracing |
| {passed in filter stack} |
| grpc_connected_channel_filter - for interfacing with transports */ |
| server->channel_filter_count = filter_count + 1 + census_enabled; |
| server->channel_filters = |
| gpr_malloc(server->channel_filter_count * sizeof(grpc_channel_filter *)); |
| server->channel_filters[0] = &server_surface_filter; |
| /* TODO(census): restore this once we rework census filter |
| if (census_enabled) { |
| server->channel_filters[1] = &grpc_server_census_filter; |
| } */ |
| for (i = 0; i < filter_count; i++) { |
| server->channel_filters[i + 1 + census_enabled] = filters[i]; |
| } |
| |
| server->channel_args = grpc_channel_args_copy(args); |
| |
| return server; |
| } |
| |
| static int streq(const char *a, const char *b) { |
| if (a == NULL && b == NULL) return 1; |
| if (a == NULL) return 0; |
| if (b == NULL) return 0; |
| return 0 == strcmp(a, b); |
| } |
| |
| void *grpc_server_register_method(grpc_server *server, const char *method, |
| const char *host) { |
| registered_method *m; |
| if (!method) { |
| gpr_log(GPR_ERROR, |
| "grpc_server_register_method method string cannot be NULL"); |
| return NULL; |
| } |
| for (m = server->registered_methods; m; m = m->next) { |
| if (streq(m->method, method) && streq(m->host, host)) { |
| gpr_log(GPR_ERROR, "duplicate registration for %s@%s", method, |
| host ? host : "*"); |
| return NULL; |
| } |
| } |
| m = gpr_malloc(sizeof(registered_method)); |
| memset(m, 0, sizeof(*m)); |
| m->method = gpr_strdup(method); |
| m->host = gpr_strdup(host); |
| m->next = server->registered_methods; |
| server->registered_methods = m; |
| return m; |
| } |
| |
| void grpc_server_start(grpc_server *server) { |
| listener *l; |
| size_t i; |
| |
| server->pollsets = gpr_malloc(sizeof(grpc_pollset *) * server->cq_count); |
| for (i = 0; i < server->cq_count; i++) { |
| server->pollsets[i] = grpc_cq_pollset(server->cqs[i]); |
| } |
| |
| for (l = server->listeners; l; l = l->next) { |
| l->start(server, l->arg, server->pollsets, server->cq_count); |
| } |
| } |
| |
| void grpc_server_setup_transport(grpc_server *s, grpc_transport *transport, |
| grpc_channel_filter const **extra_filters, |
| size_t num_extra_filters, grpc_mdctx *mdctx, |
| const grpc_channel_args *args) { |
| size_t num_filters = s->channel_filter_count + num_extra_filters + 1; |
| grpc_channel_filter const **filters = |
| gpr_malloc(sizeof(grpc_channel_filter *) * num_filters); |
| size_t i; |
| size_t num_registered_methods; |
| size_t alloc; |
| registered_method *rm; |
| channel_registered_method *crm; |
| grpc_channel *channel; |
| channel_data *chand; |
| grpc_mdstr *host; |
| grpc_mdstr *method; |
| gpr_uint32 hash; |
| gpr_uint32 slots; |
| gpr_uint32 probes; |
| gpr_uint32 max_probes = 0; |
| grpc_transport_op op; |
| |
| for (i = 0; i < s->channel_filter_count; i++) { |
| filters[i] = s->channel_filters[i]; |
| } |
| for (; i < s->channel_filter_count + num_extra_filters; i++) { |
| filters[i] = extra_filters[i - s->channel_filter_count]; |
| } |
| filters[i] = &grpc_connected_channel_filter; |
| |
| for (i = 0; i < s->cq_count; i++) { |
| memset(&op, 0, sizeof(op)); |
| op.bind_pollset = grpc_cq_pollset(s->cqs[i]); |
| grpc_transport_perform_op(transport, &op); |
| } |
| |
| channel = |
| grpc_channel_create_from_filters(filters, num_filters, args, mdctx, 0); |
| chand = (channel_data *)grpc_channel_stack_element( |
| grpc_channel_get_channel_stack(channel), 0) |
| ->channel_data; |
| chand->server = s; |
| server_ref(s); |
| chand->channel = channel; |
| |
| num_registered_methods = 0; |
| for (rm = s->registered_methods; rm; rm = rm->next) { |
| num_registered_methods++; |
| } |
| /* build a lookup table phrased in terms of mdstr's in this channels context |
| to quickly find registered methods */ |
| if (num_registered_methods > 0) { |
| slots = 2 * num_registered_methods; |
| alloc = sizeof(channel_registered_method) * slots; |
| chand->registered_methods = gpr_malloc(alloc); |
| memset(chand->registered_methods, 0, alloc); |
| for (rm = s->registered_methods; rm; rm = rm->next) { |
| host = rm->host ? grpc_mdstr_from_string(mdctx, rm->host) : NULL; |
| method = grpc_mdstr_from_string(mdctx, rm->method); |
| hash = GRPC_MDSTR_KV_HASH(host ? host->hash : 0, method->hash); |
| for (probes = 0; chand->registered_methods[(hash + probes) % slots] |
| .server_registered_method != NULL; |
| probes++) |
| ; |
| if (probes > max_probes) max_probes = probes; |
| crm = &chand->registered_methods[(hash + probes) % slots]; |
| crm->server_registered_method = rm; |
| crm->host = host; |
| crm->method = method; |
| } |
| chand->registered_method_slots = slots; |
| chand->registered_method_max_probes = max_probes; |
| } |
| |
| grpc_connected_channel_bind_transport(grpc_channel_get_channel_stack(channel), |
| transport); |
| |
| gpr_mu_lock(&s->mu_global); |
| chand->next = &s->root_channel_data; |
| chand->prev = chand->next->prev; |
| chand->next->prev = chand->prev->next = chand; |
| gpr_mu_unlock(&s->mu_global); |
| |
| gpr_free(filters); |
| |
| GRPC_CHANNEL_INTERNAL_REF(channel, "connectivity"); |
| memset(&op, 0, sizeof(op)); |
| op.set_accept_stream = accept_stream; |
| op.set_accept_stream_user_data = chand; |
| op.on_connectivity_state_change = &chand->channel_connectivity_changed; |
| op.connectivity_state = &chand->connectivity_state; |
| grpc_transport_perform_op(transport, &op); |
| } |
| |
| void grpc_server_shutdown_and_notify(grpc_server *server, |
| grpc_completion_queue *cq, void *tag) { |
| listener *l; |
| requested_call_array requested_calls; |
| size_t i; |
| registered_method *rm; |
| shutdown_tag *sdt; |
| channel_broadcaster broadcaster; |
| |
| /* lock, and gather up some stuff to do */ |
| gpr_mu_lock(&server->mu_global); |
| grpc_cq_begin_op(cq, NULL); |
| server->shutdown_tags = |
| gpr_realloc(server->shutdown_tags, |
| sizeof(shutdown_tag) * (server->num_shutdown_tags + 1)); |
| sdt = &server->shutdown_tags[server->num_shutdown_tags++]; |
| sdt->tag = tag; |
| sdt->cq = cq; |
| if (server->shutdown) { |
| gpr_mu_unlock(&server->mu_global); |
| return; |
| } |
| |
| channel_broadcaster_init(server, &broadcaster); |
| |
| /* collect all unregistered then registered calls */ |
| gpr_mu_lock(&server->mu_call); |
| requested_calls = server->requested_calls; |
| memset(&server->requested_calls, 0, sizeof(server->requested_calls)); |
| for (rm = server->registered_methods; rm; rm = rm->next) { |
| if (requested_calls.count + rm->requested.count > |
| requested_calls.capacity) { |
| requested_calls.capacity = |
| GPR_MAX(requested_calls.count + rm->requested.count, |
| 2 * requested_calls.capacity); |
| requested_calls.calls = |
| gpr_realloc(requested_calls.calls, sizeof(*requested_calls.calls) * |
| requested_calls.capacity); |
| } |
| memcpy(requested_calls.calls + requested_calls.count, rm->requested.calls, |
| sizeof(*requested_calls.calls) * rm->requested.count); |
| requested_calls.count += rm->requested.count; |
| gpr_free(rm->requested.calls); |
| memset(&rm->requested, 0, sizeof(rm->requested)); |
| } |
| gpr_mu_unlock(&server->mu_call); |
| |
| server->shutdown = 1; |
| maybe_finish_shutdown(server); |
| gpr_mu_unlock(&server->mu_global); |
| |
| /* terminate all the requested calls */ |
| for (i = 0; i < requested_calls.count; i++) { |
| fail_call(server, &requested_calls.calls[i]); |
| } |
| gpr_free(requested_calls.calls); |
| |
| /* Shutdown listeners */ |
| for (l = server->listeners; l; l = l->next) { |
| l->destroy(server, l->arg); |
| } |
| |
| channel_broadcaster_shutdown(&broadcaster, 1, 0); |
| } |
| |
| void grpc_server_listener_destroy_done(void *s) { |
| grpc_server *server = s; |
| gpr_mu_lock(&server->mu_global); |
| server->listeners_destroyed++; |
| maybe_finish_shutdown(server); |
| gpr_mu_unlock(&server->mu_global); |
| } |
| |
| void grpc_server_cancel_all_calls(grpc_server *server) { |
| channel_broadcaster broadcaster; |
| |
| gpr_mu_lock(&server->mu_global); |
| channel_broadcaster_init(server, &broadcaster); |
| gpr_mu_unlock(&server->mu_global); |
| |
| channel_broadcaster_shutdown(&broadcaster, 0, 1); |
| } |
| |
| void grpc_server_destroy(grpc_server *server) { |
| listener *l; |
| |
| gpr_mu_lock(&server->mu_global); |
| GPR_ASSERT(server->shutdown || !server->listeners); |
| GPR_ASSERT(server->listeners_destroyed == num_listeners(server)); |
| |
| while (server->listeners) { |
| l = server->listeners; |
| server->listeners = l->next; |
| gpr_free(l); |
| } |
| |
| gpr_mu_unlock(&server->mu_global); |
| |
| server_unref(server); |
| } |
| |
| void grpc_server_add_listener(grpc_server *server, void *arg, |
| void (*start)(grpc_server *server, void *arg, |
| grpc_pollset **pollsets, |
| size_t pollset_count), |
| void (*destroy)(grpc_server *server, void *arg)) { |
| listener *l = gpr_malloc(sizeof(listener)); |
| l->arg = arg; |
| l->start = start; |
| l->destroy = destroy; |
| l->next = server->listeners; |
| server->listeners = l; |
| } |
| |
| static grpc_call_error queue_call_request(grpc_server *server, |
| requested_call *rc) { |
| call_data *calld = NULL; |
| requested_call_array *requested_calls = NULL; |
| gpr_mu_lock(&server->mu_call); |
| if (server->shutdown) { |
| gpr_mu_unlock(&server->mu_call); |
| fail_call(server, rc); |
| return GRPC_CALL_OK; |
| } |
| switch (rc->type) { |
| case BATCH_CALL: |
| calld = |
| call_list_remove_head(&server->lists[PENDING_START], PENDING_START); |
| requested_calls = &server->requested_calls; |
| break; |
| case REGISTERED_CALL: |
| calld = call_list_remove_head( |
| &rc->data.registered.registered_method->pending, PENDING_START); |
| requested_calls = &rc->data.registered.registered_method->requested; |
| break; |
| } |
| if (calld) { |
| GPR_ASSERT(calld->state == PENDING); |
| calld->state = ACTIVATED; |
| gpr_mu_unlock(&server->mu_call); |
| begin_call(server, calld, rc); |
| return GRPC_CALL_OK; |
| } else { |
| *requested_call_array_add(requested_calls) = *rc; |
| gpr_mu_unlock(&server->mu_call); |
| return GRPC_CALL_OK; |
| } |
| } |
| |
| grpc_call_error grpc_server_request_call( |
| grpc_server *server, grpc_call **call, grpc_call_details *details, |
| grpc_metadata_array *initial_metadata, |
| grpc_completion_queue *cq_bound_to_call, |
| grpc_completion_queue *cq_for_notification, void *tag) { |
| requested_call rc; |
| GRPC_SERVER_LOG_REQUEST_CALL(GPR_INFO, server, call, details, |
| initial_metadata, cq_bound_to_call, |
| cq_for_notification, tag); |
| if (!grpc_cq_is_server_cq(cq_for_notification)) { |
| return GRPC_CALL_ERROR_NOT_SERVER_COMPLETION_QUEUE; |
| } |
| grpc_cq_begin_op(cq_for_notification, NULL); |
| rc.type = BATCH_CALL; |
| rc.tag = tag; |
| rc.cq_bound_to_call = cq_bound_to_call; |
| rc.cq_for_notification = cq_for_notification; |
| rc.call = call; |
| rc.data.batch.details = details; |
| rc.data.batch.initial_metadata = initial_metadata; |
| return queue_call_request(server, &rc); |
| } |
| |
| grpc_call_error grpc_server_request_registered_call( |
| grpc_server *server, void *rm, grpc_call **call, gpr_timespec *deadline, |
| grpc_metadata_array *initial_metadata, grpc_byte_buffer **optional_payload, |
| grpc_completion_queue *cq_bound_to_call, |
| grpc_completion_queue *cq_for_notification, void *tag) { |
| requested_call rc; |
| registered_method *registered_method = rm; |
| if (!grpc_cq_is_server_cq(cq_for_notification)) { |
| return GRPC_CALL_ERROR_NOT_SERVER_COMPLETION_QUEUE; |
| } |
| grpc_cq_begin_op(cq_for_notification, NULL); |
| rc.type = REGISTERED_CALL; |
| rc.tag = tag; |
| rc.cq_bound_to_call = cq_bound_to_call; |
| rc.cq_for_notification = cq_for_notification; |
| rc.call = call; |
| rc.data.registered.registered_method = registered_method; |
| rc.data.registered.deadline = deadline; |
| rc.data.registered.initial_metadata = initial_metadata; |
| rc.data.registered.optional_payload = optional_payload; |
| return queue_call_request(server, &rc); |
| } |
| |
| static void publish_registered_or_batch(grpc_call *call, int success, |
| void *tag); |
| static void publish_was_not_set(grpc_call *call, int success, void *tag) { |
| abort(); |
| } |
| |
| static void cpstr(char **dest, size_t *capacity, grpc_mdstr *value) { |
| gpr_slice slice = value->slice; |
| size_t len = GPR_SLICE_LENGTH(slice); |
| |
| if (len + 1 > *capacity) { |
| *capacity = GPR_MAX(len + 1, *capacity * 2); |
| *dest = gpr_realloc(*dest, *capacity); |
| } |
| memcpy(*dest, grpc_mdstr_as_c_string(value), len + 1); |
| } |
| |
| static void begin_call(grpc_server *server, call_data *calld, |
| requested_call *rc) { |
| grpc_ioreq_completion_func publish = publish_was_not_set; |
| grpc_ioreq req[2]; |
| grpc_ioreq *r = req; |
| |
| /* called once initial metadata has been read by the call, but BEFORE |
| the ioreq to fetch it out of the call has been executed. |
| This means metadata related fields can be relied on in calld, but to |
| fill in the metadata array passed by the client, we need to perform |
| an ioreq op, that should complete immediately. */ |
| |
| grpc_call_set_completion_queue(calld->call, rc->cq_bound_to_call); |
| *rc->call = calld->call; |
| calld->cq_new = rc->cq_for_notification; |
| switch (rc->type) { |
| case BATCH_CALL: |
| GPR_ASSERT(calld->host != NULL); |
| GPR_ASSERT(calld->path != NULL); |
| cpstr(&rc->data.batch.details->host, |
| &rc->data.batch.details->host_capacity, calld->host); |
| cpstr(&rc->data.batch.details->method, |
| &rc->data.batch.details->method_capacity, calld->path); |
| rc->data.batch.details->deadline = calld->deadline; |
| r->op = GRPC_IOREQ_RECV_INITIAL_METADATA; |
| r->data.recv_metadata = rc->data.batch.initial_metadata; |
| r->flags = 0; |
| r++; |
| publish = publish_registered_or_batch; |
| break; |
| case REGISTERED_CALL: |
| *rc->data.registered.deadline = calld->deadline; |
| r->op = GRPC_IOREQ_RECV_INITIAL_METADATA; |
| r->data.recv_metadata = rc->data.registered.initial_metadata; |
| r->flags = 0; |
| r++; |
| if (rc->data.registered.optional_payload) { |
| r->op = GRPC_IOREQ_RECV_MESSAGE; |
| r->data.recv_message = rc->data.registered.optional_payload; |
| r->flags = 0; |
| r++; |
| } |
| publish = publish_registered_or_batch; |
| break; |
| } |
| |
| GRPC_CALL_INTERNAL_REF(calld->call, "server"); |
| grpc_call_start_ioreq_and_call_back(calld->call, req, r - req, publish, |
| rc->tag); |
| } |
| |
| static void fail_call(grpc_server *server, requested_call *rc) { |
| *rc->call = NULL; |
| switch (rc->type) { |
| case BATCH_CALL: |
| rc->data.batch.initial_metadata->count = 0; |
| break; |
| case REGISTERED_CALL: |
| rc->data.registered.initial_metadata->count = 0; |
| break; |
| } |
| grpc_cq_end_op(rc->cq_for_notification, rc->tag, NULL, 0); |
| } |
| |
| static void publish_registered_or_batch(grpc_call *call, int success, |
| void *tag) { |
| grpc_call_element *elem = |
| grpc_call_stack_element(grpc_call_get_call_stack(call), 0); |
| call_data *calld = elem->call_data; |
| grpc_cq_end_op(calld->cq_new, tag, call, success); |
| } |
| |
| const grpc_channel_args *grpc_server_get_channel_args(grpc_server *server) { |
| return server->channel_args; |
| } |
| |
| int grpc_server_has_open_connections(grpc_server *server) { |
| int r; |
| gpr_mu_lock(&server->mu_global); |
| r = server->root_channel_data.next != &server->root_channel_data; |
| gpr_mu_unlock(&server->mu_global); |
| return r; |
| } |