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grpc/src/core/lib/surface/server.c

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/*
*
* 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 "src/core/lib/surface/server.h"
#include <limits.h>
#include <stdlib.h>
#include <string.h>
#include <grpc/support/alloc.h>
#include <grpc/support/log.h>
#include <grpc/support/string_util.h>
#include <grpc/support/useful.h>
#include "src/core/lib/channel/channel_args.h"
#include "src/core/lib/channel/connected_channel.h"
#include "src/core/lib/iomgr/iomgr.h"
#include "src/core/lib/support/stack_lockfree.h"
#include "src/core/lib/support/string.h"
#include "src/core/lib/surface/api_trace.h"
#include "src/core/lib/surface/call.h"
#include "src/core/lib/surface/channel.h"
#include "src/core/lib/surface/completion_queue.h"
#include "src/core/lib/surface/init.h"
#include "src/core/lib/transport/metadata.h"
#include "src/core/lib/transport/static_metadata.h"
typedef struct listener {
void *arg;
void (*start)(grpc_exec_ctx *exec_ctx, grpc_server *server, void *arg,
grpc_pollset **pollsets, size_t pollset_count);
void (*destroy)(grpc_exec_ctx *exec_ctx, grpc_server *server, void *arg,
grpc_closure *closure);
struct listener *next;
grpc_closure destroy_done;
} 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 {
requested_call_type type;
void *tag;
grpc_server *server;
grpc_completion_queue *cq_bound_to_call;
grpc_completion_queue *cq_for_notification;
grpc_call **call;
grpc_cq_completion completion;
grpc_metadata_array *initial_metadata;
union {
struct {
grpc_call_details *details;
} batch;
struct {
registered_method *registered_method;
gpr_timespec *deadline;
grpc_byte_buffer **optional_payload;
} registered;
} data;
} requested_call;
typedef struct channel_registered_method {
registered_method *server_registered_method;
uint32_t flags;
grpc_mdstr *method;
grpc_mdstr *host;
} channel_registered_method;
struct channel_data {
grpc_server *server;
grpc_connectivity_state connectivity_state;
grpc_channel *channel;
/* linked list of all channels on a server */
channel_data *next;
channel_data *prev;
channel_registered_method *registered_methods;
uint32_t registered_method_slots;
uint32_t registered_method_max_probes;
grpc_closure finish_destroy_channel_closure;
grpc_closure channel_connectivity_changed;
};
typedef struct shutdown_tag {
void *tag;
grpc_completion_queue *cq;
grpc_cq_completion completion;
} shutdown_tag;
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;
typedef struct request_matcher request_matcher;
struct call_data {
grpc_call *call;
/** protects state */
gpr_mu mu_state;
/** the current state of a call - see call_state */
call_state state;
grpc_mdstr *path;
grpc_mdstr *host;
gpr_timespec deadline;
grpc_completion_queue *cq_new;
grpc_metadata_batch *recv_initial_metadata;
bool recv_idempotent_request;
grpc_metadata_array initial_metadata;
request_matcher *request_matcher;
grpc_byte_buffer *payload;
grpc_closure got_initial_metadata;
grpc_closure server_on_recv_initial_metadata;
grpc_closure kill_zombie_closure;
grpc_closure *on_done_recv_initial_metadata;
grpc_closure publish;
call_data *pending_next;
};
struct request_matcher {
grpc_server *server;
call_data *pending_head;
call_data *pending_tail;
gpr_stack_lockfree *requests;
};
struct registered_method {
char *method;
char *host;
grpc_server_register_method_payload_handling payload_handling;
uint32_t flags;
request_matcher request_matcher;
registered_method *next;
};
typedef struct {
grpc_channel **channels;
size_t num_channels;
} channel_broadcaster;
struct grpc_server {
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;
request_matcher unregistered_request_matcher;
/** free list of available requested_calls indices */
gpr_stack_lockfree *request_freelist;
/** requested call backing data */
requested_call *requested_calls;
size_t max_requested_calls;
gpr_atm shutdown_flag;
uint8_t shutdown_published;
size_t num_shutdown_tags;
shutdown_tag *shutdown_tags;
channel_data root_channel_data;
listener *listeners;
int listeners_destroyed;
gpr_refcount internal_refcount;
/** when did we print the last shutdown progress message */
gpr_timespec last_shutdown_message_time;
};
#define SERVER_FROM_CALL_ELEM(elem) \
(((channel_data *)(elem)->channel_data)->server)
static void publish_new_rpc(grpc_exec_ctx *exec_ctx, void *calld, bool success);
static void fail_call(grpc_exec_ctx *exec_ctx, 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_exec_ctx *exec_ctx, 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_closure closure;
gpr_slice slice;
};
static void shutdown_cleanup(grpc_exec_ctx *exec_ctx, void *arg,
bool iomgr_status_ignored) {
struct shutdown_cleanup_args *a = arg;
gpr_slice_unref(a->slice);
gpr_free(a);
}
static void send_shutdown(grpc_exec_ctx *exec_ctx, 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_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(exec_ctx, elem, &op);
}
static void channel_broadcaster_shutdown(grpc_exec_ctx *exec_ctx,
channel_broadcaster *cb,
int send_goaway,
int force_disconnect) {
size_t i;
for (i = 0; i < cb->num_channels; i++) {
send_shutdown(exec_ctx, cb->channels[i], send_goaway, force_disconnect);
GRPC_CHANNEL_INTERNAL_UNREF(exec_ctx, cb->channels[i], "broadcast");
}
gpr_free(cb->channels);
}
/*
* request_matcher
*/
static void request_matcher_init(request_matcher *rm, size_t entries,
grpc_server *server) {
memset(rm, 0, sizeof(*rm));
rm->server = server;
rm->requests = gpr_stack_lockfree_create(entries);
}
static void request_matcher_destroy(request_matcher *rm) {
GPR_ASSERT(gpr_stack_lockfree_pop(rm->requests) == -1);
gpr_stack_lockfree_destroy(rm->requests);
}
static void kill_zombie(grpc_exec_ctx *exec_ctx, void *elem, bool success) {
grpc_call_destroy(grpc_call_from_top_element(elem));
}
static void request_matcher_zombify_all_pending_calls(grpc_exec_ctx *exec_ctx,
request_matcher *rm) {
while (rm->pending_head) {
call_data *calld = rm->pending_head;
rm->pending_head = calld->pending_next;
gpr_mu_lock(&calld->mu_state);
calld->state = ZOMBIED;
gpr_mu_unlock(&calld->mu_state);
grpc_closure_init(
&calld->kill_zombie_closure, kill_zombie,
grpc_call_stack_element(grpc_call_get_call_stack(calld->call), 0));
grpc_exec_ctx_enqueue(exec_ctx, &calld->kill_zombie_closure, true, NULL);
}
}
static void request_matcher_kill_requests(grpc_exec_ctx *exec_ctx,
grpc_server *server,
request_matcher *rm) {
int request_id;
while ((request_id = gpr_stack_lockfree_pop(rm->requests)) != -1) {
fail_call(exec_ctx, server, &server->requested_calls[request_id]);
}
}
/*
* server proper
*/
static void server_ref(grpc_server *server) {
gpr_ref(&server->internal_refcount);
}
static void server_delete(grpc_exec_ctx *exec_ctx, 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);
while ((rm = server->registered_methods) != NULL) {
server->registered_methods = rm->next;
request_matcher_destroy(&rm->request_matcher);
gpr_free(rm->method);
gpr_free(rm->host);
gpr_free(rm);
}
for (i = 0; i < server->cq_count; i++) {
GRPC_CQ_INTERNAL_UNREF(server->cqs[i], "server");
}
request_matcher_destroy(&server->unregistered_request_matcher);
gpr_stack_lockfree_destroy(server->request_freelist);
gpr_free(server->cqs);
gpr_free(server->pollsets);
gpr_free(server->shutdown_tags);
gpr_free(server->requested_calls);
gpr_free(server);
}
static void server_unref(grpc_exec_ctx *exec_ctx, grpc_server *server) {
if (gpr_unref(&server->internal_refcount)) {
server_delete(exec_ctx, 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(grpc_exec_ctx *exec_ctx, void *cd,
bool success) {
channel_data *chand = cd;
grpc_server *server = chand->server;
GRPC_CHANNEL_INTERNAL_UNREF(exec_ctx, chand->channel, "server");
server_unref(exec_ctx, server);
}
static void destroy_channel(grpc_exec_ctx *exec_ctx, channel_data *chand) {
if (is_channel_orphaned(chand)) return;
GPR_ASSERT(chand->server != NULL);
orphan_channel(chand);
server_ref(chand->server);
maybe_finish_shutdown(exec_ctx, chand->server);
chand->finish_destroy_channel_closure.cb = finish_destroy_channel;
chand->finish_destroy_channel_closure.cb_arg = chand;
grpc_transport_op op;
memset(&op, 0, sizeof(op));
op.set_accept_stream = true;
op.on_consumed = &chand->finish_destroy_channel_closure;
grpc_channel_next_op(exec_ctx,
grpc_channel_stack_element(
grpc_channel_get_channel_stack(chand->channel), 0),
&op);
}
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 done_request_event(grpc_exec_ctx *exec_ctx, void *req,
grpc_cq_completion *c) {
requested_call *rc = req;
grpc_server *server = rc->server;
if (rc >= server->requested_calls &&
rc < server->requested_calls + server->max_requested_calls) {
GPR_ASSERT(rc - server->requested_calls <= INT_MAX);
gpr_stack_lockfree_push(server->request_freelist,
(int)(rc - server->requested_calls));
} else {
gpr_free(req);
}
server_unref(exec_ctx, server);
}
static void publish_call(grpc_exec_ctx *exec_ctx, grpc_server *server,
call_data *calld, requested_call *rc) {
grpc_call_set_completion_queue(exec_ctx, calld->call, rc->cq_bound_to_call);
grpc_call *call = calld->call;
*rc->call = call;
calld->cq_new = rc->cq_for_notification;
GPR_SWAP(grpc_metadata_array, *rc->initial_metadata, calld->initial_metadata);
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;
rc->data.batch.details->flags =
0 | (calld->recv_idempotent_request
? GRPC_INITIAL_METADATA_IDEMPOTENT_REQUEST
: 0);
break;
case REGISTERED_CALL:
*rc->data.registered.deadline = calld->deadline;
if (rc->data.registered.optional_payload) {
*rc->data.registered.optional_payload = calld->payload;
}
break;
default:
GPR_UNREACHABLE_CODE(return );
}
grpc_call_element *elem =
grpc_call_stack_element(grpc_call_get_call_stack(call), 0);
channel_data *chand = elem->channel_data;
server_ref(chand->server);
grpc_cq_end_op(exec_ctx, calld->cq_new, rc->tag, true, done_request_event, rc,
&rc->completion);
}
static void publish_new_rpc(grpc_exec_ctx *exec_ctx, void *arg, bool success) {
call_data *calld = arg;
request_matcher *rm = calld->request_matcher;
grpc_server *server = rm->server;
if (!success || gpr_atm_acq_load(&server->shutdown_flag)) {
gpr_mu_lock(&calld->mu_state);
calld->state = ZOMBIED;
gpr_mu_unlock(&calld->mu_state);
grpc_closure_init(
&calld->kill_zombie_closure, kill_zombie,
grpc_call_stack_element(grpc_call_get_call_stack(calld->call), 0));
grpc_exec_ctx_enqueue(exec_ctx, &calld->kill_zombie_closure, true, NULL);
return;
}
int request_id = gpr_stack_lockfree_pop(rm->requests);
if (request_id == -1) {
gpr_mu_lock(&server->mu_call);
gpr_mu_lock(&calld->mu_state);
calld->state = PENDING;
gpr_mu_unlock(&calld->mu_state);
if (rm->pending_head == NULL) {
rm->pending_tail = rm->pending_head = calld;
} else {
rm->pending_tail->pending_next = calld;
rm->pending_tail = calld;
}
calld->pending_next = NULL;
gpr_mu_unlock(&server->mu_call);
} else {
gpr_mu_lock(&calld->mu_state);
calld->state = ACTIVATED;
gpr_mu_unlock(&calld->mu_state);
publish_call(exec_ctx, server, calld, &server->requested_calls[request_id]);
}
}
static void finish_start_new_rpc(
grpc_exec_ctx *exec_ctx, grpc_server *server, grpc_call_element *elem,
request_matcher *rm,
grpc_server_register_method_payload_handling payload_handling) {
call_data *calld = elem->call_data;
if (gpr_atm_acq_load(&server->shutdown_flag)) {
gpr_mu_lock(&calld->mu_state);
calld->state = ZOMBIED;
gpr_mu_unlock(&calld->mu_state);
grpc_closure_init(&calld->kill_zombie_closure, kill_zombie, elem);
grpc_exec_ctx_enqueue(exec_ctx, &calld->kill_zombie_closure, true, NULL);
return;
}
calld->request_matcher = rm;
switch (payload_handling) {
case GRPC_SRM_PAYLOAD_NONE:
publish_new_rpc(exec_ctx, calld, true);
break;
case GRPC_SRM_PAYLOAD_READ_INITIAL_BYTE_BUFFER: {
grpc_op op;
memset(&op, 0, sizeof(op));
op.op = GRPC_OP_RECV_MESSAGE;
op.data.recv_message = &calld->payload;
grpc_closure_init(&calld->publish, publish_new_rpc, calld);
grpc_call_start_batch_and_execute(exec_ctx, calld->call, &op, 1,
&calld->publish);
break;
}
}
}
static void start_new_rpc(grpc_exec_ctx *exec_ctx, grpc_call_element *elem) {
channel_data *chand = elem->channel_data;
call_data *calld = elem->call_data;
grpc_server *server = chand->server;
uint32_t i;
uint32_t hash;
channel_registered_method *rm;
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;
if ((rm->flags & GRPC_INITIAL_METADATA_IDEMPOTENT_REQUEST) &&
!calld->recv_idempotent_request)
continue;
finish_start_new_rpc(exec_ctx, server, elem,
&rm->server_registered_method->request_matcher,
rm->server_registered_method->payload_handling);
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;
if ((rm->flags & GRPC_INITIAL_METADATA_IDEMPOTENT_REQUEST) &&
!calld->recv_idempotent_request)
continue;
finish_start_new_rpc(exec_ctx, server, elem,
&rm->server_registered_method->request_matcher,
rm->server_registered_method->payload_handling);
return;
}
}
finish_start_new_rpc(exec_ctx, server, elem,
&server->unregistered_request_matcher,
GRPC_SRM_PAYLOAD_NONE);
}
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 done_shutdown_event(grpc_exec_ctx *exec_ctx, void *server,
grpc_cq_completion *completion) {
server_unref(exec_ctx, server);
}
static int num_channels(grpc_server *server) {
channel_data *chand;
int n = 0;
for (chand = server->root_channel_data.next;
chand != &server->root_channel_data; chand = chand->next) {
n++;
}
return n;
}
static void kill_pending_work_locked(grpc_exec_ctx *exec_ctx,
grpc_server *server) {
registered_method *rm;
request_matcher_kill_requests(exec_ctx, server,
&server->unregistered_request_matcher);
request_matcher_zombify_all_pending_calls(
exec_ctx, &server->unregistered_request_matcher);
for (rm = server->registered_methods; rm; rm = rm->next) {
request_matcher_kill_requests(exec_ctx, server, &rm->request_matcher);
request_matcher_zombify_all_pending_calls(exec_ctx, &rm->request_matcher);
}
}
static void maybe_finish_shutdown(grpc_exec_ctx *exec_ctx,
grpc_server *server) {
size_t i;
if (!gpr_atm_acq_load(&server->shutdown_flag) || server->shutdown_published) {
return;
}
kill_pending_work_locked(exec_ctx, server);
if (server->root_channel_data.next != &server->root_channel_data ||
server->listeners_destroyed < num_listeners(server)) {
if (gpr_time_cmp(gpr_time_sub(gpr_now(GPR_CLOCK_REALTIME),
server->last_shutdown_message_time),
gpr_time_from_seconds(1, GPR_TIMESPAN)) >= 0) {
server->last_shutdown_message_time = gpr_now(GPR_CLOCK_REALTIME);
gpr_log(GPR_DEBUG,
"Waiting for %d channels and %d/%d listeners to be destroyed"
" before shutting down server",
num_channels(server),
num_listeners(server) - server->listeners_destroyed,
num_listeners(server));
}
return;
}
server->shutdown_published = 1;
for (i = 0; i < server->num_shutdown_tags; i++) {
server_ref(server);
grpc_cq_end_op(exec_ctx, server->shutdown_tags[i].cq,
server->shutdown_tags[i].tag, 1, done_shutdown_event, server,
&server->shutdown_tags[i].completion);
}
}
static grpc_mdelem *server_filter(void *user_data, grpc_mdelem *md) {
grpc_call_element *elem = user_data;
call_data *calld = elem->call_data;
if (md->key == GRPC_MDSTR_PATH) {
if (calld->path == NULL) {
calld->path = GRPC_MDSTR_REF(md->value);
}
return NULL;
} else if (md->key == GRPC_MDSTR_AUTHORITY) {
if (calld->host == NULL) {
calld->host = GRPC_MDSTR_REF(md->value);
}
return NULL;
}
return md;
}
static void server_on_recv_initial_metadata(grpc_exec_ctx *exec_ctx, void *ptr,
bool success) {
grpc_call_element *elem = ptr;
call_data *calld = elem->call_data;
gpr_timespec op_deadline;
grpc_metadata_batch_filter(calld->recv_initial_metadata, server_filter, elem);
op_deadline = calld->recv_initial_metadata->deadline;
if (0 != gpr_time_cmp(op_deadline, gpr_inf_future(op_deadline.clock_type))) {
calld->deadline = op_deadline;
}
if (calld->host && calld->path) {
/* do nothing */
} else {
success = 0;
}
calld->on_done_recv_initial_metadata->cb(
exec_ctx, calld->on_done_recv_initial_metadata->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_initial_metadata != NULL) {
GPR_ASSERT(op->recv_idempotent_request == NULL);
calld->recv_initial_metadata = op->recv_initial_metadata;
calld->on_done_recv_initial_metadata = op->recv_initial_metadata_ready;
op->recv_initial_metadata_ready = &calld->server_on_recv_initial_metadata;
op->recv_idempotent_request = &calld->recv_idempotent_request;
}
}
static void server_start_transport_stream_op(grpc_exec_ctx *exec_ctx,
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(exec_ctx, elem, op);
}
static void got_initial_metadata(grpc_exec_ctx *exec_ctx, void *ptr,
bool success) {
grpc_call_element *elem = ptr;
call_data *calld = elem->call_data;
if (success) {
start_new_rpc(exec_ctx, elem);
} else {
gpr_mu_lock(&calld->mu_state);
if (calld->state == NOT_STARTED) {
calld->state = ZOMBIED;
gpr_mu_unlock(&calld->mu_state);
grpc_closure_init(&calld->kill_zombie_closure, kill_zombie, elem);
grpc_exec_ctx_enqueue(exec_ctx, &calld->kill_zombie_closure, true, NULL);
} else if (calld->state == PENDING) {
calld->state = ZOMBIED;
gpr_mu_unlock(&calld->mu_state);
/* zombied call will be destroyed when it's removed from the pending
queue... later */
} else {
gpr_mu_unlock(&calld->mu_state);
}
}
}
static void accept_stream(grpc_exec_ctx *exec_ctx, void *cd,
grpc_transport *transport,
const void *transport_server_data) {
channel_data *chand = cd;
/* create a call */
grpc_call *call =
grpc_call_create(chand->channel, NULL, 0, NULL, transport_server_data,
NULL, 0, gpr_inf_future(GPR_CLOCK_MONOTONIC));
grpc_call_element *elem =
grpc_call_stack_element(grpc_call_get_call_stack(call), 0);
call_data *calld = elem->call_data;
grpc_op op;
memset(&op, 0, sizeof(op));
op.op = GRPC_OP_RECV_INITIAL_METADATA;
op.data.recv_initial_metadata = &calld->initial_metadata;
grpc_closure_init(&calld->got_initial_metadata, got_initial_metadata, elem);
grpc_call_start_batch_and_execute(exec_ctx, call, &op, 1,
&calld->got_initial_metadata);
}
static void channel_connectivity_changed(grpc_exec_ctx *exec_ctx, void *cd,
bool 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(exec_ctx,
grpc_channel_stack_element(
grpc_channel_get_channel_stack(chand->channel), 0),
&op);
} else {
gpr_mu_lock(&server->mu_global);
destroy_channel(exec_ctx, chand);
gpr_mu_unlock(&server->mu_global);
GRPC_CHANNEL_INTERNAL_UNREF(exec_ctx, chand->channel, "connectivity");
}
}
static void init_call_elem(grpc_exec_ctx *exec_ctx, grpc_call_element *elem,
grpc_call_element_args *args) {
call_data *calld = elem->call_data;
channel_data *chand = elem->channel_data;
memset(calld, 0, sizeof(call_data));
calld->deadline = gpr_inf_future(GPR_CLOCK_REALTIME);
calld->call = grpc_call_from_top_element(elem);
gpr_mu_init(&calld->mu_state);
grpc_closure_init(&calld->server_on_recv_initial_metadata,
server_on_recv_initial_metadata, elem);
server_ref(chand->server);
}
static void destroy_call_elem(grpc_exec_ctx *exec_ctx, grpc_call_element *elem,
void *ignored) {
channel_data *chand = elem->channel_data;
call_data *calld = elem->call_data;
GPR_ASSERT(calld->state != PENDING);
if (calld->host) {
GRPC_MDSTR_UNREF(calld->host);
}
if (calld->path) {
GRPC_MDSTR_UNREF(calld->path);
}
grpc_metadata_array_destroy(&calld->initial_metadata);
gpr_mu_destroy(&calld->mu_state);
server_unref(exec_ctx, chand->server);
}
static void init_channel_elem(grpc_exec_ctx *exec_ctx,
grpc_channel_element *elem,
grpc_channel_element_args *args) {
channel_data *chand = elem->channel_data;
GPR_ASSERT(args->is_first);
GPR_ASSERT(!args->is_last);
chand->server = NULL;
chand->channel = NULL;
chand->next = chand->prev = chand;
chand->registered_methods = NULL;
chand->connectivity_state = GRPC_CHANNEL_IDLE;
grpc_closure_init(&chand->channel_connectivity_changed,
channel_connectivity_changed, chand);
}
static void destroy_channel_elem(grpc_exec_ctx *exec_ctx,
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(exec_ctx, chand->server);
gpr_mu_unlock(&chand->server->mu_global);
server_unref(exec_ctx, chand->server);
}
}
const grpc_channel_filter grpc_server_top_filter = {
server_start_transport_stream_op,
grpc_channel_next_op,
sizeof(call_data),
init_call_elem,
grpc_call_stack_ignore_set_pollset,
destroy_call_elem,
sizeof(channel_data),
init_channel_elem,
destroy_channel_elem,
grpc_call_next_get_peer,
"server",
};
static void register_completion_queue(grpc_server *server,
grpc_completion_queue *cq,
bool is_non_listening, void *reserved) {
size_t i, n;
GPR_ASSERT(!reserved);
for (i = 0; i < server->cq_count; i++) {
if (server->cqs[i] == cq) return;
}
grpc_cq_mark_server_cq(cq);
/* Non-listening completion queues are not added to server->cqs */
if (is_non_listening) {
grpc_cq_mark_non_listening_server_cq(cq);
} else {
GRPC_CQ_INTERNAL_REF(cq, "server");
n = server->cq_count++;
server->cqs = gpr_realloc(
server->cqs, server->cq_count * sizeof(grpc_completion_queue *));
server->cqs[n] = cq;
}
}
void grpc_server_register_completion_queue(grpc_server *server,
grpc_completion_queue *cq,
void *reserved) {
GRPC_API_TRACE(
"grpc_server_register_completion_queue(server=%p, cq=%p, reserved=%p)", 3,
(server, cq, reserved));
register_completion_queue(server, cq, false, reserved);
}
void grpc_server_register_non_listening_completion_queue(
grpc_server *server, grpc_completion_queue *cq, void *reserved) {
GRPC_API_TRACE(
"grpc_server_register_non_listening_completion_queue(server=%p, cq=%p, "
"reserved=%p)",
3, (server, cq, reserved));
register_completion_queue(server, cq, true, reserved);
}
grpc_server *grpc_server_create(const grpc_channel_args *args, void *reserved) {
size_t i;
GRPC_API_TRACE("grpc_server_create(%p, %p)", 2, (args, reserved));
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;
/* TODO(ctiller): expose a channel_arg for this */
server->max_requested_calls = 32768;
server->request_freelist =
gpr_stack_lockfree_create(server->max_requested_calls);
for (i = 0; i < (size_t)server->max_requested_calls; i++) {
gpr_stack_lockfree_push(server->request_freelist, (int)i);
}
request_matcher_init(&server->unregistered_request_matcher,
server->max_requested_calls, server);
server->requested_calls = gpr_malloc(server->max_requested_calls *
sizeof(*server->requested_calls));
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,
grpc_server_register_method_payload_handling payload_handling,
uint32_t flags) {
registered_method *m;
GRPC_API_TRACE(
"grpc_server_register_method(server=%p, method=%s, host=%s, "
"flags=0x%08x)",
4, (server, method, host, flags));
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;
}
}
if ((flags & ~GRPC_INITIAL_METADATA_USED_MASK) != 0) {
gpr_log(GPR_ERROR, "grpc_server_register_method invalid flags 0x%08x",
flags);
return NULL;
}
m = gpr_malloc(sizeof(registered_method));
memset(m, 0, sizeof(*m));
request_matcher_init(&m->request_matcher, server->max_requested_calls,
server);
m->method = gpr_strdup(method);
m->host = gpr_strdup(host);
m->next = server->registered_methods;
m->payload_handling = payload_handling;
m->flags = flags;
server->registered_methods = m;
return m;
}
void grpc_server_start(grpc_server *server) {
listener *l;
size_t i;
grpc_exec_ctx exec_ctx = GRPC_EXEC_CTX_INIT;
GRPC_API_TRACE("grpc_server_start(server=%p)", 1, (server));
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(&exec_ctx, server, l->arg, server->pollsets, server->cq_count);
}
grpc_exec_ctx_finish(&exec_ctx);
}
void grpc_server_setup_transport(grpc_exec_ctx *exec_ctx, grpc_server *s,
grpc_transport *transport,
const grpc_channel_args *args) {
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;
uint32_t hash;
size_t slots;
uint32_t probes;
uint32_t max_probes = 0;
grpc_transport_op op;
channel =
grpc_channel_create(exec_ctx, NULL, args, GRPC_SERVER_CHANNEL, transport);
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(rm->host) : NULL;
method = grpc_mdstr_from_string(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->flags = rm->flags;
crm->host = host;
crm->method = method;
}
GPR_ASSERT(slots <= UINT32_MAX);
chand->registered_method_slots = (uint32_t)slots;
chand->registered_method_max_probes = max_probes;
}
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);
GRPC_CHANNEL_INTERNAL_REF(channel, "connectivity");
memset(&op, 0, sizeof(op));
op.set_accept_stream = true;
op.set_accept_stream_fn = accept_stream;
op.set_accept_stream_user_data = chand;
op.on_connectivity_state_change = &chand->channel_connectivity_changed;
op.connectivity_state = &chand->connectivity_state;
op.disconnect = gpr_atm_acq_load(&s->shutdown_flag) != 0;
grpc_transport_perform_op(exec_ctx, transport, &op);
}
void done_published_shutdown(grpc_exec_ctx *exec_ctx, void *done_arg,
grpc_cq_completion *storage) {
(void)done_arg;
gpr_free(storage);
}
static void listener_destroy_done(grpc_exec_ctx *exec_ctx, void *s,
bool success) {
grpc_server *server = s;
gpr_mu_lock(&server->mu_global);
server->listeners_destroyed++;
maybe_finish_shutdown(exec_ctx, server);
gpr_mu_unlock(&server->mu_global);
}
void grpc_server_shutdown_and_notify(grpc_server *server,
grpc_completion_queue *cq, void *tag) {
listener *l;
shutdown_tag *sdt;
channel_broadcaster broadcaster;
grpc_exec_ctx exec_ctx = GRPC_EXEC_CTX_INIT;
GRPC_API_TRACE("grpc_server_shutdown_and_notify(server=%p, cq=%p, tag=%p)", 3,
(server, cq, tag));
/* lock, and gather up some stuff to do */
gpr_mu_lock(&server->mu_global);
grpc_cq_begin_op(cq, tag);
if (server->shutdown_published) {
grpc_cq_end_op(&exec_ctx, cq, tag, 1, done_published_shutdown, NULL,
gpr_malloc(sizeof(grpc_cq_completion)));
gpr_mu_unlock(&server->mu_global);
goto done;
}
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 (gpr_atm_acq_load(&server->shutdown_flag)) {
gpr_mu_unlock(&server->mu_global);
goto done;
}
server->last_shutdown_message_time = gpr_now(GPR_CLOCK_REALTIME);
channel_broadcaster_init(server, &broadcaster);
gpr_atm_rel_store(&server->shutdown_flag, 1);
/* collect all unregistered then registered calls */
gpr_mu_lock(&server->mu_call);
kill_pending_work_locked(&exec_ctx, server);
gpr_mu_unlock(&server->mu_call);
maybe_finish_shutdown(&exec_ctx, server);
gpr_mu_unlock(&server->mu_global);
/* Shutdown listeners */
for (l = server->listeners; l; l = l->next) {
grpc_closure_init(&l->destroy_done, listener_destroy_done, server);
l->destroy(&exec_ctx, server, l->arg, &l->destroy_done);
}
channel_broadcaster_shutdown(&exec_ctx, &broadcaster, 1, 0);
done:
grpc_exec_ctx_finish(&exec_ctx);
}
void grpc_server_cancel_all_calls(grpc_server *server) {
channel_broadcaster broadcaster;
grpc_exec_ctx exec_ctx = GRPC_EXEC_CTX_INIT;
GRPC_API_TRACE("grpc_server_cancel_all_calls(server=%p)", 1, (server));
gpr_mu_lock(&server->mu_global);
channel_broadcaster_init(server, &broadcaster);
gpr_mu_unlock(&server->mu_global);
channel_broadcaster_shutdown(&exec_ctx, &broadcaster, 0, 1);
grpc_exec_ctx_finish(&exec_ctx);
}
void grpc_server_destroy(grpc_server *server) {
listener *l;
grpc_exec_ctx exec_ctx = GRPC_EXEC_CTX_INIT;
GRPC_API_TRACE("grpc_server_destroy(server=%p)", 1, (server));
gpr_mu_lock(&server->mu_global);
GPR_ASSERT(gpr_atm_acq_load(&server->shutdown_flag) || !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(&exec_ctx, server);
grpc_exec_ctx_finish(&exec_ctx);
}
void grpc_server_add_listener(
grpc_exec_ctx *exec_ctx, grpc_server *server, void *arg,
void (*start)(grpc_exec_ctx *exec_ctx, grpc_server *server, void *arg,
grpc_pollset **pollsets, size_t pollset_count),
void (*destroy)(grpc_exec_ctx *exec_ctx, grpc_server *server, void *arg,
grpc_closure *on_done)) {
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_exec_ctx *exec_ctx,
grpc_server *server,
requested_call *rc) {
call_data *calld = NULL;
request_matcher *rm = NULL;
int request_id;
if (gpr_atm_acq_load(&server->shutdown_flag)) {
fail_call(exec_ctx, server, rc);
return GRPC_CALL_OK;
}
request_id = gpr_stack_lockfree_pop(server->request_freelist);
if (request_id == -1) {
/* out of request ids: just fail this one */
fail_call(exec_ctx, server, rc);
return GRPC_CALL_OK;
}
switch (rc->type) {
case BATCH_CALL:
rm = &server->unregistered_request_matcher;
break;
case REGISTERED_CALL:
rm = &rc->data.registered.registered_method->request_matcher;
break;
}
server->requested_calls[request_id] = *rc;
gpr_free(rc);
if (gpr_stack_lockfree_push(rm->requests, request_id)) {
/* this was the first queued request: we need to lock and start
matching calls */
gpr_mu_lock(&server->mu_call);
while ((calld = rm->pending_head) != NULL) {
request_id = gpr_stack_lockfree_pop(rm->requests);
if (request_id == -1) break;
rm->pending_head = calld->pending_next;
gpr_mu_unlock(&server->mu_call);
gpr_mu_lock(&calld->mu_state);
if (calld->state == ZOMBIED) {
gpr_mu_unlock(&calld->mu_state);
grpc_closure_init(
&calld->kill_zombie_closure, kill_zombie,
grpc_call_stack_element(grpc_call_get_call_stack(calld->call), 0));
grpc_exec_ctx_enqueue(exec_ctx, &calld->kill_zombie_closure, true,
NULL);
} else {
GPR_ASSERT(calld->state == PENDING);
calld->state = ACTIVATED;
gpr_mu_unlock(&calld->mu_state);
publish_call(exec_ctx, server, calld,
&server->requested_calls[request_id]);
}
gpr_mu_lock(&server->mu_call);
}
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) {
grpc_call_error error;
grpc_exec_ctx exec_ctx = GRPC_EXEC_CTX_INIT;
requested_call *rc = gpr_malloc(sizeof(*rc));
GRPC_API_TRACE(
"grpc_server_request_call("
"server=%p, call=%p, details=%p, initial_metadata=%p, "
"cq_bound_to_call=%p, cq_for_notification=%p, tag=%p)",
7, (server, call, details, initial_metadata, cq_bound_to_call,
cq_for_notification, tag));
if (!grpc_cq_is_server_cq(cq_for_notification)) {
gpr_free(rc);
error = GRPC_CALL_ERROR_NOT_SERVER_COMPLETION_QUEUE;
goto done;
}
grpc_cq_begin_op(cq_for_notification, tag);
details->reserved = NULL;
rc->type = BATCH_CALL;
rc->server = server;
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->initial_metadata = initial_metadata;
error = queue_call_request(&exec_ctx, server, rc);
done:
grpc_exec_ctx_finish(&exec_ctx);
return error;
}
grpc_call_error grpc_server_request_registered_call(
grpc_server *server, void *rmp, 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) {
grpc_call_error error;
grpc_exec_ctx exec_ctx = GRPC_EXEC_CTX_INIT;
requested_call *rc = gpr_malloc(sizeof(*rc));
registered_method *rm = rmp;
GRPC_API_TRACE(
"grpc_server_request_registered_call("
"server=%p, rmp=%p, call=%p, deadline=%p, initial_metadata=%p, "
"optional_payload=%p, cq_bound_to_call=%p, cq_for_notification=%p, "
"tag=%p)",
9, (server, rmp, call, deadline, initial_metadata, optional_payload,
cq_bound_to_call, cq_for_notification, tag));
if (!grpc_cq_is_server_cq(cq_for_notification)) {
gpr_free(rc);
error = GRPC_CALL_ERROR_NOT_SERVER_COMPLETION_QUEUE;
goto done;
}
if ((optional_payload == NULL) !=
(rm->payload_handling == GRPC_SRM_PAYLOAD_NONE)) {
gpr_free(rc);
error = GRPC_CALL_ERROR_PAYLOAD_TYPE_MISMATCH;
goto done;
}
grpc_cq_begin_op(cq_for_notification, tag);
rc->type = REGISTERED_CALL;
rc->server = server;
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 = rm;
rc->data.registered.deadline = deadline;
rc->initial_metadata = initial_metadata;
rc->data.registered.optional_payload = optional_payload;
error = queue_call_request(&exec_ctx, server, rc);
done:
grpc_exec_ctx_finish(&exec_ctx);
return error;
}
static void fail_call(grpc_exec_ctx *exec_ctx, grpc_server *server,
requested_call *rc) {
*rc->call = NULL;
rc->initial_metadata->count = 0;
server_ref(server);
grpc_cq_end_op(exec_ctx, rc->cq_for_notification, rc->tag, 0,
done_request_event, rc, &rc->completion);
}
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;
}
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