Exemplo n.º 1
0
static char *cc_get_peer(grpc_exec_ctx *exec_ctx, grpc_call_element *elem) {
  call_data *calld = elem->call_data;
  grpc_subchannel_call *subchannel_call = GET_CALL(calld);
  if (subchannel_call == NULL || subchannel_call == CANCELLED_CALL) {
    return NULL;
  } else {
    return grpc_subchannel_call_get_peer(exec_ctx, subchannel_call);
  }
}
Exemplo n.º 2
0
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) {
    return grpc_subchannel_call_get_peer(exec_ctx, subchannel_call);
  } else {
    return NULL;
  }
}
Exemplo n.º 3
0
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);
}
Exemplo n.º 4
0
/* Destructor for call_data */
static void cc_destroy_call_elem(grpc_exec_ctx *exec_ctx,
                                 grpc_call_element *elem,
                                 const grpc_call_final_info *final_info,
                                 void *and_free_memory) {
  call_data *calld = elem->call_data;
  grpc_subchannel_call *call = GET_CALL(calld);
  if (call != NULL && call != CANCELLED_CALL) {
    GRPC_SUBCHANNEL_CALL_UNREF(exec_ctx, call, "client_channel_destroy_call");
  }
  GPR_ASSERT(calld->creation_phase == GRPC_SUBCHANNEL_CALL_HOLDER_NOT_CREATING);
  gpr_mu_destroy(&calld->mu);
  GPR_ASSERT(calld->waiting_ops_count == 0);
  gpr_free(calld->waiting_ops);
  gpr_free(and_free_memory);
}
Exemplo n.º 5
0
static void call_ready(grpc_exec_ctx *exec_ctx, void *arg, int success) {
  grpc_subchannel_call_holder *holder = arg;
  GPR_TIMER_BEGIN("call_ready", 0);
  gpr_mu_lock(&holder->mu);
  GPR_ASSERT(holder->creation_phase ==
             GRPC_SUBCHANNEL_CALL_HOLDER_CREATING_CALL);
  holder->creation_phase = GRPC_SUBCHANNEL_CALL_HOLDER_NOT_CREATING;
  if (GET_CALL(holder) != NULL) {
    retry_waiting_locked(exec_ctx, holder);
  } else {
    fail_locked(exec_ctx, holder);
  }
  gpr_mu_unlock(&holder->mu);
  GPR_TIMER_END("call_ready", 0);
}
Exemplo n.º 6
0
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);
    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_enqueue(exec_ctx, grpc_closure_create(retry_ops, a), 1);
}
Exemplo n.º 7
0
static void retry_waiting_locked(grpc_exec_ctx *exec_ctx, call_data *calld) {
  if (calld->waiting_ops_count == 0) {
    return;
  }

  retry_ops_args *a = gpr_malloc(sizeof(*a));
  a->ops = calld->waiting_ops;
  a->nops = calld->waiting_ops_count;
  a->call = GET_CALL(calld);
  if (a->call == CANCELLED_CALL) {
    gpr_free(a);
    fail_locked(exec_ctx, calld, GRPC_ERROR_CANCELLED);
    return;
  }
  calld->waiting_ops = NULL;
  calld->waiting_ops_count = 0;
  calld->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);
}
Exemplo n.º 8
0
static void subchannel_ready(grpc_exec_ctx *exec_ctx, void *arg, int success) {
  grpc_subchannel_call_holder *holder = arg;
  grpc_subchannel_call *call;
  gpr_mu_lock(&holder->mu);
  GPR_ASSERT(holder->creation_phase ==
             GRPC_SUBCHANNEL_CALL_HOLDER_PICKING_SUBCHANNEL);
  call = GET_CALL(holder);
  GPR_ASSERT(call == NULL || call == CANCELLED_CALL);
  holder->creation_phase = GRPC_SUBCHANNEL_CALL_HOLDER_NOT_CREATING;
  if (holder->connected_subchannel == NULL) {
    fail_locked(exec_ctx, holder);
  } else {
    gpr_atm_rel_store(
        &holder->subchannel_call,
        (gpr_atm)(uintptr_t)grpc_connected_subchannel_create_call(
            exec_ctx, holder->connected_subchannel, holder->pollset));
    retry_waiting_locked(exec_ctx, holder);
  }
  gpr_mu_unlock(&holder->mu);
  GRPC_CALL_STACK_UNREF(exec_ctx, holder->owning_call, "pick_subchannel");
}
Exemplo n.º 9
0
static void subchannel_ready(grpc_exec_ctx *exec_ctx, void *arg,
                             grpc_error *error) {
  grpc_call_element *elem = arg;
  call_data *calld = elem->call_data;
  channel_data *chand = elem->channel_data;
  gpr_mu_lock(&calld->mu);
  GPR_ASSERT(calld->creation_phase ==
             GRPC_SUBCHANNEL_CALL_HOLDER_PICKING_SUBCHANNEL);
  grpc_polling_entity_del_from_pollset_set(exec_ctx, calld->pollent,
                                           chand->interested_parties);
  calld->creation_phase = GRPC_SUBCHANNEL_CALL_HOLDER_NOT_CREATING;
  if (calld->connected_subchannel == NULL) {
    gpr_atm_no_barrier_store(&calld->subchannel_call, 1);
    fail_locked(exec_ctx, calld, GRPC_ERROR_CREATE_REFERENCING(
                                     "Failed to create subchannel", &error, 1));
  } else if (GET_CALL(calld) == CANCELLED_CALL) {
    /* already cancelled before subchannel became ready */
    fail_locked(exec_ctx, calld,
                GRPC_ERROR_CREATE_REFERENCING(
                    "Cancelled before creating subchannel", &error, 1));
  } else {
    /* Create call on subchannel. */
    grpc_subchannel_call *subchannel_call = NULL;
    grpc_error *new_error = grpc_connected_subchannel_create_call(
        exec_ctx, calld->connected_subchannel, calld->pollent, calld->path,
        calld->deadline, &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, calld, new_error);
    }
    gpr_atm_rel_store(&calld->subchannel_call,
                      (gpr_atm)(uintptr_t)subchannel_call);
    retry_waiting_locked(exec_ctx, calld);
  }
  gpr_mu_unlock(&calld->mu);
  GRPC_CALL_STACK_UNREF(exec_ctx, calld->owning_call, "pick_subchannel");
}
Exemplo n.º 10
0
static void subchannel_ready(grpc_exec_ctx *exec_ctx, void *arg, int success) {
  grpc_subchannel_call_holder *holder = arg;
  grpc_subchannel_call *call;
  gpr_mu_lock(&holder->mu);
  GPR_ASSERT(holder->creation_phase ==
             GRPC_SUBCHANNEL_CALL_HOLDER_PICKING_SUBCHANNEL);
  call = GET_CALL(holder);
  GPR_ASSERT(call == NULL || call == CANCELLED_CALL);
  if (holder->subchannel == NULL) {
    holder->creation_phase = GRPC_SUBCHANNEL_CALL_HOLDER_NOT_CREATING;
    fail_locked(exec_ctx, holder);
  } else {
    grpc_closure_init(&holder->next_step, call_ready, holder);
    if (grpc_subchannel_create_call(exec_ctx, holder->subchannel,
                                    holder->pollset, &holder->subchannel_call,
                                    &holder->next_step)) {
      holder->creation_phase = GRPC_SUBCHANNEL_CALL_HOLDER_NOT_CREATING;
      /* got one immediately - continue the op (and any waiting ops) */
      retry_waiting_locked(exec_ctx, holder);
    }
  }
  gpr_mu_unlock(&holder->mu);
}
Exemplo n.º 11
0
// 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.
static void cc_start_transport_stream_op(grpc_exec_ctx *exec_ctx,
                                         grpc_call_element *elem,
                                         grpc_transport_stream_op *op) {
  call_data *calld = elem->call_data;
  channel_data *chand = elem->channel_data;
  GRPC_CALL_LOG_OP(GPR_INFO, elem, op);
  grpc_deadline_state_client_start_transport_stream_op(exec_ctx, elem, op);
  /* try to (atomically) get the call */
  grpc_subchannel_call *call = GET_CALL(calld);
  GPR_TIMER_BEGIN("cc_start_transport_stream_op", 0);
  if (call == CANCELLED_CALL) {
    grpc_transport_stream_op_finish_with_failure(
        exec_ctx, op, GRPC_ERROR_REF(calld->cancel_error));
    GPR_TIMER_END("cc_start_transport_stream_op", 0);
    return;
  }
  if (call != NULL) {
    grpc_subchannel_call_process_op(exec_ctx, call, op);
    GPR_TIMER_END("cc_start_transport_stream_op", 0);
    return;
  }
  /* we failed; lock and figure out what to do */
  gpr_mu_lock(&calld->mu);
retry:
  /* need to recheck that another thread hasn't set the call */
  call = GET_CALL(calld);
  if (call == CANCELLED_CALL) {
    gpr_mu_unlock(&calld->mu);
    grpc_transport_stream_op_finish_with_failure(
        exec_ctx, op, GRPC_ERROR_REF(calld->cancel_error));
    GPR_TIMER_END("cc_start_transport_stream_op", 0);
    return;
  }
  if (call != NULL) {
    gpr_mu_unlock(&calld->mu);
    grpc_subchannel_call_process_op(exec_ctx, call, op);
    GPR_TIMER_END("cc_start_transport_stream_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(&calld->subchannel_call, 0,
                         (gpr_atm)(uintptr_t)CANCELLED_CALL)) {
      goto retry;
    } else {
      // Stash a copy of cancel_error in our call data, so that we can use
      // it for subsequent operations.  This ensures that if the call is
      // cancelled before any ops are passed down (e.g., if the deadline
      // is in the past when the call starts), we can return the right
      // error to the caller when the first op does get passed down.
      calld->cancel_error = GRPC_ERROR_REF(op->cancel_error);
      switch (calld->creation_phase) {
        case GRPC_SUBCHANNEL_CALL_HOLDER_NOT_CREATING:
          fail_locked(exec_ctx, calld, GRPC_ERROR_REF(op->cancel_error));
          break;
        case GRPC_SUBCHANNEL_CALL_HOLDER_PICKING_SUBCHANNEL:
          pick_subchannel(exec_ctx, elem, NULL, 0, &calld->connected_subchannel,
                          NULL, GRPC_ERROR_REF(op->cancel_error));
          break;
      }
      gpr_mu_unlock(&calld->mu);
      grpc_transport_stream_op_finish_with_failure(
          exec_ctx, op, GRPC_ERROR_REF(op->cancel_error));
      GPR_TIMER_END("cc_start_transport_stream_op", 0);
      return;
    }
  }
  /* if we don't have a subchannel, try to get one */
  if (calld->creation_phase == GRPC_SUBCHANNEL_CALL_HOLDER_NOT_CREATING &&
      calld->connected_subchannel == NULL &&
      op->send_initial_metadata != NULL) {
    calld->creation_phase = GRPC_SUBCHANNEL_CALL_HOLDER_PICKING_SUBCHANNEL;
    grpc_closure_init(&calld->next_step, subchannel_ready, elem);
    GRPC_CALL_STACK_REF(calld->owning_call, "pick_subchannel");
    /* If a subchannel is not available immediately, the polling entity from
       call_data should be provided to channel_data's interested_parties, so
       that IO of the lb_policy and resolver could be done under it. */
    if (pick_subchannel(exec_ctx, elem, op->send_initial_metadata,
                        op->send_initial_metadata_flags,
                        &calld->connected_subchannel, &calld->next_step,
                        GRPC_ERROR_NONE)) {
      calld->creation_phase = GRPC_SUBCHANNEL_CALL_HOLDER_NOT_CREATING;
      GRPC_CALL_STACK_UNREF(exec_ctx, calld->owning_call, "pick_subchannel");
    } else {
      grpc_polling_entity_add_to_pollset_set(exec_ctx, calld->pollent,
                                             chand->interested_parties);
    }
  }
  /* if we've got a subchannel, then let's ask it to create a call */
  if (calld->creation_phase == GRPC_SUBCHANNEL_CALL_HOLDER_NOT_CREATING &&
      calld->connected_subchannel != NULL) {
    grpc_subchannel_call *subchannel_call = NULL;
    grpc_error *error = grpc_connected_subchannel_create_call(
        exec_ctx, calld->connected_subchannel, calld->pollent, calld->path,
        calld->deadline, &subchannel_call);
    if (error != GRPC_ERROR_NONE) {
      subchannel_call = CANCELLED_CALL;
      fail_locked(exec_ctx, calld, GRPC_ERROR_REF(error));
      grpc_transport_stream_op_finish_with_failure(exec_ctx, op, error);
    }
    gpr_atm_rel_store(&calld->subchannel_call,
                      (gpr_atm)(uintptr_t)subchannel_call);
    retry_waiting_locked(exec_ctx, calld);
    goto retry;
  }
  /* nothing to be done but wait */
  add_waiting_locked(calld, op);
  gpr_mu_unlock(&calld->mu);
  GPR_TIMER_END("cc_start_transport_stream_op", 0);
}
Exemplo n.º 12
0
// 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.
static void cc_start_transport_stream_op(grpc_exec_ctx *exec_ctx,
                                         grpc_call_element *elem,
                                         grpc_transport_stream_op *op) {
  call_data *calld = elem->call_data;
  GRPC_CALL_LOG_OP(GPR_INFO, elem, op);
  /* try to (atomically) get the call */
  grpc_subchannel_call *call = GET_CALL(calld);
  GPR_TIMER_BEGIN("cc_start_transport_stream_op", 0);
  if (call == CANCELLED_CALL) {
    grpc_transport_stream_op_finish_with_failure(exec_ctx, op,
                                                 GRPC_ERROR_CANCELLED);
    GPR_TIMER_END("cc_start_transport_stream_op", 0);
    return;
  }
  if (call != NULL) {
    grpc_subchannel_call_process_op(exec_ctx, call, op);
    GPR_TIMER_END("cc_start_transport_stream_op", 0);
    return;
  }
  /* we failed; lock and figure out what to do */
  gpr_mu_lock(&calld->mu);
retry:
  /* need to recheck that another thread hasn't set the call */
  call = GET_CALL(calld);
  if (call == CANCELLED_CALL) {
    gpr_mu_unlock(&calld->mu);
    grpc_transport_stream_op_finish_with_failure(exec_ctx, op,
                                                 GRPC_ERROR_CANCELLED);
    GPR_TIMER_END("cc_start_transport_stream_op", 0);
    return;
  }
  if (call != NULL) {
    gpr_mu_unlock(&calld->mu);
    grpc_subchannel_call_process_op(exec_ctx, call, op);
    GPR_TIMER_END("cc_start_transport_stream_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(&calld->subchannel_call, 0,
                         (gpr_atm)(uintptr_t)CANCELLED_CALL)) {
      goto retry;
    } else {
      switch (calld->creation_phase) {
        case GRPC_SUBCHANNEL_CALL_HOLDER_NOT_CREATING:
          fail_locked(exec_ctx, calld, GRPC_ERROR_REF(op->cancel_error));
          break;
        case GRPC_SUBCHANNEL_CALL_HOLDER_PICKING_SUBCHANNEL:
          pick_subchannel(exec_ctx, elem, NULL, 0, &calld->connected_subchannel,
                          NULL);
          break;
      }
      gpr_mu_unlock(&calld->mu);
      grpc_transport_stream_op_finish_with_failure(exec_ctx, op,
                                                   GRPC_ERROR_CANCELLED);
      GPR_TIMER_END("cc_start_transport_stream_op", 0);
      return;
    }
  }
  /* if we don't have a subchannel, try to get one */
  if (calld->creation_phase == GRPC_SUBCHANNEL_CALL_HOLDER_NOT_CREATING &&
      calld->connected_subchannel == NULL &&
      op->send_initial_metadata != NULL) {
    calld->creation_phase = GRPC_SUBCHANNEL_CALL_HOLDER_PICKING_SUBCHANNEL;
    grpc_closure_init(&calld->next_step, subchannel_ready, calld);
    GRPC_CALL_STACK_REF(calld->owning_call, "pick_subchannel");
    if (pick_subchannel(exec_ctx, elem, op->send_initial_metadata,
                        op->send_initial_metadata_flags,
                        &calld->connected_subchannel, &calld->next_step)) {
      calld->creation_phase = GRPC_SUBCHANNEL_CALL_HOLDER_NOT_CREATING;
      GRPC_CALL_STACK_UNREF(exec_ctx, calld->owning_call, "pick_subchannel");
    }
  }
  /* if we've got a subchannel, then let's ask it to create a call */
  if (calld->creation_phase == GRPC_SUBCHANNEL_CALL_HOLDER_NOT_CREATING &&
      calld->connected_subchannel != NULL) {
    grpc_subchannel_call *subchannel_call = NULL;
    grpc_error *error = grpc_connected_subchannel_create_call(
        exec_ctx, calld->connected_subchannel, calld->pollent,
        &subchannel_call);
    if (error != GRPC_ERROR_NONE) {
      subchannel_call = CANCELLED_CALL;
      fail_locked(exec_ctx, calld, GRPC_ERROR_REF(error));
      grpc_transport_stream_op_finish_with_failure(exec_ctx, op, error);
    }
    gpr_atm_rel_store(&calld->subchannel_call,
                      (gpr_atm)(uintptr_t)subchannel_call);
    retry_waiting_locked(exec_ctx, calld);
    goto retry;
  }
  /* nothing to be done but wait */
  add_waiting_locked(calld, op);
  gpr_mu_unlock(&calld->mu);
  GPR_TIMER_END("cc_start_transport_stream_op", 0);
}
Exemplo n.º 13
0
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);
    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);
    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_with_status != GRPC_STATUS_OK) {
    if (!gpr_atm_rel_cas(&holder->subchannel_call, 0, 1)) {
      goto retry;
    } else {
      switch (holder->creation_phase) {
        case GRPC_SUBCHANNEL_CALL_HOLDER_NOT_CREATING:
          fail_locked(exec_ctx, holder);
          break;
        case GRPC_SUBCHANNEL_CALL_HOLDER_PICKING_SUBCHANNEL:
          holder->pick_subchannel(exec_ctx, holder->pick_subchannel_arg, NULL,
                                  &holder->connected_subchannel, NULL);
          break;
      }
      gpr_mu_unlock(&holder->mu);
      grpc_transport_stream_op_finish_with_failure(exec_ctx, op);
      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,
            &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) {
    gpr_atm_rel_store(
        &holder->subchannel_call,
        (gpr_atm)(uintptr_t)grpc_connected_subchannel_create_call(
            exec_ctx, holder->connected_subchannel, holder->pollset));
    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);
}