diff options
Diffstat (limited to 'src/core/ext/client_config/subchannel_call_holder.c')
| -rw-r--r-- | src/core/ext/client_config/subchannel_call_holder.c | 292 |
1 files changed, 0 insertions, 292 deletions
diff --git a/src/core/ext/client_config/subchannel_call_holder.c b/src/core/ext/client_config/subchannel_call_holder.c deleted file mode 100644 index be6d054af4..0000000000 --- a/src/core/ext/client_config/subchannel_call_holder.c +++ /dev/null @@ -1,292 +0,0 @@ -/* - * - * 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/client_config/subchannel_call_holder.h" - -#include <grpc/support/alloc.h> - -#include "src/core/lib/profiling/timers.h" - -#define GET_CALL(holder) \ - ((grpc_subchannel_call *)(gpr_atm_acq_load(&(holder)->subchannel_call))) - -#define CANCELLED_CALL ((grpc_subchannel_call *)1) - -static void subchannel_ready(grpc_exec_ctx *exec_ctx, void *holder, - grpc_error *error); -static void retry_ops(grpc_exec_ctx *exec_ctx, void *retry_ops_args, - grpc_error *error); - -static void add_waiting_locked(grpc_subchannel_call_holder *holder, - grpc_transport_stream_op *op); -static void fail_locked(grpc_exec_ctx *exec_ctx, - grpc_subchannel_call_holder *holder, grpc_error *error); -static void retry_waiting_locked(grpc_exec_ctx *exec_ctx, - grpc_subchannel_call_holder *holder); - -void grpc_subchannel_call_holder_init( - grpc_subchannel_call_holder *holder, - grpc_subchannel_call_holder_pick_subchannel pick_subchannel, - void *pick_subchannel_arg, grpc_call_stack *owning_call) { - gpr_atm_rel_store(&holder->subchannel_call, 0); - holder->pick_subchannel = pick_subchannel; - holder->pick_subchannel_arg = pick_subchannel_arg; - gpr_mu_init(&holder->mu); - holder->connected_subchannel = NULL; - holder->waiting_ops = NULL; - holder->waiting_ops_count = 0; - holder->waiting_ops_capacity = 0; - holder->creation_phase = GRPC_SUBCHANNEL_CALL_HOLDER_NOT_CREATING; - holder->owning_call = owning_call; - holder->pollent = NULL; -} - -void grpc_subchannel_call_holder_destroy(grpc_exec_ctx *exec_ctx, - grpc_subchannel_call_holder *holder) { - grpc_subchannel_call *call = GET_CALL(holder); - if (call != NULL && call != CANCELLED_CALL) { - GRPC_SUBCHANNEL_CALL_UNREF(exec_ctx, call, "holder"); - } - GPR_ASSERT(holder->creation_phase == - GRPC_SUBCHANNEL_CALL_HOLDER_NOT_CREATING); - gpr_mu_destroy(&holder->mu); - GPR_ASSERT(holder->waiting_ops_count == 0); - gpr_free(holder->waiting_ops); -} - -// The logic here is fairly complicated, due to (a) the fact that we -// need to handle the case where we receive the send op before the -// initial metadata op, and (b) the need for efficiency, especially in -// the streaming case. -// TODO(ctiller): Explain this more thoroughly. -void grpc_subchannel_call_holder_perform_op(grpc_exec_ctx *exec_ctx, - grpc_subchannel_call_holder *holder, - grpc_transport_stream_op *op) { - /* try to (atomically) get the call */ - grpc_subchannel_call *call = GET_CALL(holder); - GPR_TIMER_BEGIN("grpc_subchannel_call_holder_perform_op", 0); - if (call == CANCELLED_CALL) { - grpc_transport_stream_op_finish_with_failure(exec_ctx, op, - GRPC_ERROR_CANCELLED); - GPR_TIMER_END("grpc_subchannel_call_holder_perform_op", 0); - return; - } - if (call != NULL) { - grpc_subchannel_call_process_op(exec_ctx, call, op); - GPR_TIMER_END("grpc_subchannel_call_holder_perform_op", 0); - return; - } - /* we failed; lock and figure out what to do */ - gpr_mu_lock(&holder->mu); -retry: - /* need to recheck that another thread hasn't set the call */ - call = GET_CALL(holder); - if (call == CANCELLED_CALL) { - gpr_mu_unlock(&holder->mu); - grpc_transport_stream_op_finish_with_failure(exec_ctx, op, - GRPC_ERROR_CANCELLED); - GPR_TIMER_END("grpc_subchannel_call_holder_perform_op", 0); - return; - } - if (call != NULL) { - gpr_mu_unlock(&holder->mu); - grpc_subchannel_call_process_op(exec_ctx, call, op); - GPR_TIMER_END("grpc_subchannel_call_holder_perform_op", 0); - return; - } - /* if this is a cancellation, then we can raise our cancelled flag */ - if (op->cancel_error != GRPC_ERROR_NONE) { - if (!gpr_atm_rel_cas(&holder->subchannel_call, 0, - (gpr_atm)(uintptr_t)CANCELLED_CALL)) { - goto retry; - } else { - switch (holder->creation_phase) { - case GRPC_SUBCHANNEL_CALL_HOLDER_NOT_CREATING: - fail_locked(exec_ctx, holder, GRPC_ERROR_REF(op->cancel_error)); - break; - case GRPC_SUBCHANNEL_CALL_HOLDER_PICKING_SUBCHANNEL: - holder->pick_subchannel(exec_ctx, holder->pick_subchannel_arg, NULL, - 0, &holder->connected_subchannel, NULL); - break; - } - gpr_mu_unlock(&holder->mu); - grpc_transport_stream_op_finish_with_failure(exec_ctx, op, - GRPC_ERROR_CANCELLED); - GPR_TIMER_END("grpc_subchannel_call_holder_perform_op", 0); - return; - } - } - /* if we don't have a subchannel, try to get one */ - if (holder->creation_phase == GRPC_SUBCHANNEL_CALL_HOLDER_NOT_CREATING && - holder->connected_subchannel == NULL && - op->send_initial_metadata != NULL) { - holder->creation_phase = GRPC_SUBCHANNEL_CALL_HOLDER_PICKING_SUBCHANNEL; - grpc_closure_init(&holder->next_step, subchannel_ready, holder); - GRPC_CALL_STACK_REF(holder->owning_call, "pick_subchannel"); - if (holder->pick_subchannel( - exec_ctx, holder->pick_subchannel_arg, op->send_initial_metadata, - op->send_initial_metadata_flags, &holder->connected_subchannel, - &holder->next_step)) { - holder->creation_phase = GRPC_SUBCHANNEL_CALL_HOLDER_NOT_CREATING; - GRPC_CALL_STACK_UNREF(exec_ctx, holder->owning_call, "pick_subchannel"); - } - } - /* if we've got a subchannel, then let's ask it to create a call */ - if (holder->creation_phase == GRPC_SUBCHANNEL_CALL_HOLDER_NOT_CREATING && - holder->connected_subchannel != NULL) { - grpc_subchannel_call *subchannel_call = NULL; - grpc_error *error = grpc_connected_subchannel_create_call( - exec_ctx, holder->connected_subchannel, holder->pollent, - &subchannel_call); - if (error != GRPC_ERROR_NONE) { - subchannel_call = CANCELLED_CALL; - fail_locked(exec_ctx, holder, GRPC_ERROR_REF(error)); - grpc_transport_stream_op_finish_with_failure(exec_ctx, op, error); - } - gpr_atm_rel_store(&holder->subchannel_call, - (gpr_atm)(uintptr_t)subchannel_call); - retry_waiting_locked(exec_ctx, holder); - goto retry; - } - /* nothing to be done but wait */ - add_waiting_locked(holder, op); - gpr_mu_unlock(&holder->mu); - GPR_TIMER_END("grpc_subchannel_call_holder_perform_op", 0); -} - -static void subchannel_ready(grpc_exec_ctx *exec_ctx, void *arg, - grpc_error *error) { - grpc_subchannel_call_holder *holder = arg; - gpr_mu_lock(&holder->mu); - GPR_ASSERT(holder->creation_phase == - GRPC_SUBCHANNEL_CALL_HOLDER_PICKING_SUBCHANNEL); - holder->creation_phase = GRPC_SUBCHANNEL_CALL_HOLDER_NOT_CREATING; - if (holder->connected_subchannel == NULL) { - gpr_atm_no_barrier_store(&holder->subchannel_call, 1); - fail_locked(exec_ctx, holder, - GRPC_ERROR_CREATE_REFERENCING("Failed to create subchannel", - &error, 1)); - } else if (1 == gpr_atm_acq_load(&holder->subchannel_call)) { - /* already cancelled before subchannel became ready */ - fail_locked(exec_ctx, holder, - GRPC_ERROR_CREATE_REFERENCING( - "Cancelled before creating subchannel", &error, 1)); - } else { - grpc_subchannel_call *subchannel_call = NULL; - grpc_error *new_error = grpc_connected_subchannel_create_call( - exec_ctx, holder->connected_subchannel, holder->pollent, - &subchannel_call); - if (new_error != GRPC_ERROR_NONE) { - new_error = grpc_error_add_child(new_error, error); - subchannel_call = CANCELLED_CALL; - fail_locked(exec_ctx, holder, new_error); - } - gpr_atm_rel_store(&holder->subchannel_call, - (gpr_atm)(uintptr_t)subchannel_call); - retry_waiting_locked(exec_ctx, holder); - } - gpr_mu_unlock(&holder->mu); - GRPC_CALL_STACK_UNREF(exec_ctx, holder->owning_call, "pick_subchannel"); -} - -typedef struct { - grpc_transport_stream_op *ops; - size_t nops; - grpc_subchannel_call *call; -} retry_ops_args; - -static void retry_waiting_locked(grpc_exec_ctx *exec_ctx, - grpc_subchannel_call_holder *holder) { - retry_ops_args *a = gpr_malloc(sizeof(*a)); - a->ops = holder->waiting_ops; - a->nops = holder->waiting_ops_count; - a->call = GET_CALL(holder); - if (a->call == CANCELLED_CALL) { - gpr_free(a); - fail_locked(exec_ctx, holder, GRPC_ERROR_CANCELLED); - return; - } - holder->waiting_ops = NULL; - holder->waiting_ops_count = 0; - holder->waiting_ops_capacity = 0; - GRPC_SUBCHANNEL_CALL_REF(a->call, "retry_ops"); - grpc_exec_ctx_sched(exec_ctx, grpc_closure_create(retry_ops, a), - GRPC_ERROR_NONE, NULL); -} - -static void retry_ops(grpc_exec_ctx *exec_ctx, void *args, grpc_error *error) { - retry_ops_args *a = args; - size_t i; - for (i = 0; i < a->nops; i++) { - grpc_subchannel_call_process_op(exec_ctx, a->call, &a->ops[i]); - } - GRPC_SUBCHANNEL_CALL_UNREF(exec_ctx, a->call, "retry_ops"); - gpr_free(a->ops); - gpr_free(a); -} - -static void add_waiting_locked(grpc_subchannel_call_holder *holder, - grpc_transport_stream_op *op) { - GPR_TIMER_BEGIN("add_waiting_locked", 0); - if (holder->waiting_ops_count == holder->waiting_ops_capacity) { - holder->waiting_ops_capacity = GPR_MAX(3, 2 * holder->waiting_ops_capacity); - holder->waiting_ops = - gpr_realloc(holder->waiting_ops, holder->waiting_ops_capacity * - sizeof(*holder->waiting_ops)); - } - holder->waiting_ops[holder->waiting_ops_count++] = *op; - GPR_TIMER_END("add_waiting_locked", 0); -} - -static void fail_locked(grpc_exec_ctx *exec_ctx, - grpc_subchannel_call_holder *holder, - grpc_error *error) { - size_t i; - for (i = 0; i < holder->waiting_ops_count; i++) { - grpc_transport_stream_op_finish_with_failure( - exec_ctx, &holder->waiting_ops[i], GRPC_ERROR_REF(error)); - } - holder->waiting_ops_count = 0; - GRPC_ERROR_UNREF(error); -} - -char *grpc_subchannel_call_holder_get_peer( - grpc_exec_ctx *exec_ctx, grpc_subchannel_call_holder *holder) { - grpc_subchannel_call *subchannel_call = GET_CALL(holder); - - if (subchannel_call == NULL || subchannel_call == CANCELLED_CALL) { - return NULL; - } else { - return grpc_subchannel_call_get_peer(exec_ctx, subchannel_call); - } -} |