示例#1
0
static int cc_pick_subchannel(grpc_exec_ctx *exec_ctx, void *elemp,
                              grpc_metadata_batch *initial_metadata,
                              uint32_t initial_metadata_flags,
                              grpc_connected_subchannel **connected_subchannel,
                              grpc_closure *on_ready) {
  grpc_call_element *elem = elemp;
  channel_data *chand = elem->channel_data;
  call_data *calld = elem->call_data;
  continue_picking_args *cpa;
  grpc_closure *closure;

  GPR_ASSERT(connected_subchannel);

  gpr_mu_lock(&chand->mu_config);
  if (initial_metadata == NULL) {
    if (chand->lb_policy != NULL) {
      grpc_lb_policy_cancel_pick(exec_ctx, chand->lb_policy,
                                 connected_subchannel);
    }
    for (closure = chand->waiting_for_config_closures.head; closure != NULL;
         closure = grpc_closure_next(closure)) {
      cpa = closure->cb_arg;
      if (cpa->connected_subchannel == connected_subchannel) {
        cpa->connected_subchannel = NULL;
        grpc_exec_ctx_enqueue(exec_ctx, cpa->on_ready, false, NULL);
      }
    }
    gpr_mu_unlock(&chand->mu_config);
    return 1;
  }
  if (chand->lb_policy != NULL) {
    grpc_lb_policy *lb_policy = chand->lb_policy;
    int r;
    GRPC_LB_POLICY_REF(lb_policy, "cc_pick_subchannel");
    gpr_mu_unlock(&chand->mu_config);
    r = grpc_lb_policy_pick(exec_ctx, lb_policy, calld->pollset,
                            initial_metadata, initial_metadata_flags,
                            connected_subchannel, on_ready);
    GRPC_LB_POLICY_UNREF(exec_ctx, lb_policy, "cc_pick_subchannel");
    return r;
  }
  if (chand->resolver != NULL && !chand->started_resolving) {
    chand->started_resolving = 1;
    GRPC_CHANNEL_STACK_REF(chand->owning_stack, "resolver");
    grpc_resolver_next(exec_ctx, chand->resolver,
                       &chand->incoming_configuration,
                       &chand->on_config_changed);
  }
  cpa = gpr_malloc(sizeof(*cpa));
  cpa->initial_metadata = initial_metadata;
  cpa->initial_metadata_flags = initial_metadata_flags;
  cpa->connected_subchannel = connected_subchannel;
  cpa->on_ready = on_ready;
  cpa->elem = elem;
  grpc_closure_init(&cpa->closure, continue_picking, cpa);
  grpc_closure_list_add(&chand->waiting_for_config_closures, &cpa->closure, 1);
  gpr_mu_unlock(&chand->mu_config);
  return 0;
}
示例#2
0
static bool pick_subchannel(grpc_exec_ctx *exec_ctx, grpc_call_element *elem,
                            grpc_metadata_batch *initial_metadata,
                            uint32_t initial_metadata_flags,
                            grpc_connected_subchannel **connected_subchannel,
                            grpc_closure *on_ready, grpc_error *error) {
  GPR_TIMER_BEGIN("pick_subchannel", 0);

  channel_data *chand = elem->channel_data;
  call_data *calld = elem->call_data;
  continue_picking_args *cpa;
  grpc_closure *closure;

  GPR_ASSERT(connected_subchannel);

  gpr_mu_lock(&chand->mu);
  if (initial_metadata == NULL) {
    if (chand->lb_policy != NULL) {
      grpc_lb_policy_cancel_pick(exec_ctx, chand->lb_policy,
                                 connected_subchannel, GRPC_ERROR_REF(error));
    }
    for (closure = chand->waiting_for_config_closures.head; closure != NULL;
         closure = closure->next_data.next) {
      cpa = closure->cb_arg;
      if (cpa->connected_subchannel == connected_subchannel) {
        cpa->connected_subchannel = NULL;
        grpc_exec_ctx_sched(
            exec_ctx, cpa->on_ready,
            GRPC_ERROR_CREATE_REFERENCING("Pick cancelled", &error, 1), NULL);
      }
    }
    gpr_mu_unlock(&chand->mu);
    GPR_TIMER_END("pick_subchannel", 0);
    GRPC_ERROR_UNREF(error);
    return true;
  }
  GPR_ASSERT(error == GRPC_ERROR_NONE);
  if (chand->lb_policy != NULL) {
    grpc_lb_policy *lb_policy = chand->lb_policy;
    GRPC_LB_POLICY_REF(lb_policy, "pick_subchannel");
    gpr_mu_unlock(&chand->mu);
    // If the application explicitly set wait_for_ready, use that.
    // Otherwise, if the service config specified a value for this
    // method, use that.
    const bool wait_for_ready_set_from_api =
        initial_metadata_flags &
        GRPC_INITIAL_METADATA_WAIT_FOR_READY_EXPLICITLY_SET;
    const bool wait_for_ready_set_from_service_config =
        calld->wait_for_ready_from_service_config != WAIT_FOR_READY_UNSET;
    if (!wait_for_ready_set_from_api &&
        wait_for_ready_set_from_service_config) {
      if (calld->wait_for_ready_from_service_config == WAIT_FOR_READY_TRUE) {
        initial_metadata_flags |= GRPC_INITIAL_METADATA_WAIT_FOR_READY;
      } else {
        initial_metadata_flags &= ~GRPC_INITIAL_METADATA_WAIT_FOR_READY;
      }
    }
    // TODO(dgq): make this deadline configurable somehow.
    const grpc_lb_policy_pick_args inputs = {
        initial_metadata, initial_metadata_flags, &calld->lb_token_mdelem,
        gpr_inf_future(GPR_CLOCK_MONOTONIC)};
    const bool result = grpc_lb_policy_pick(
        exec_ctx, lb_policy, &inputs, connected_subchannel, NULL, on_ready);
    GRPC_LB_POLICY_UNREF(exec_ctx, lb_policy, "pick_subchannel");
    GPR_TIMER_END("pick_subchannel", 0);
    return result;
  }
  if (chand->resolver != NULL && !chand->started_resolving) {
    chand->started_resolving = true;
    GRPC_CHANNEL_STACK_REF(chand->owning_stack, "resolver");
    grpc_resolver_next(exec_ctx, chand->resolver, &chand->resolver_result,
                       &chand->on_resolver_result_changed);
  }
  if (chand->resolver != NULL) {
    cpa = gpr_malloc(sizeof(*cpa));
    cpa->initial_metadata = initial_metadata;
    cpa->initial_metadata_flags = initial_metadata_flags;
    cpa->connected_subchannel = connected_subchannel;
    cpa->on_ready = on_ready;
    cpa->elem = elem;
    grpc_closure_init(&cpa->closure, continue_picking, cpa);
    grpc_closure_list_append(&chand->waiting_for_config_closures, &cpa->closure,
                             GRPC_ERROR_NONE);
  } else {
    grpc_exec_ctx_sched(exec_ctx, on_ready, GRPC_ERROR_CREATE("Disconnected"),
                        NULL);
  }
  gpr_mu_unlock(&chand->mu);

  GPR_TIMER_END("pick_subchannel", 0);
  return false;
}
示例#3
0
static bool pick_subchannel(grpc_exec_ctx *exec_ctx, grpc_call_element *elem,
                            grpc_metadata_batch *initial_metadata,
                            uint32_t initial_metadata_flags,
                            grpc_connected_subchannel **connected_subchannel,
                            grpc_closure *on_ready) {
  GPR_TIMER_BEGIN("pick_subchannel", 0);

  channel_data *chand = elem->channel_data;
  call_data *calld = elem->call_data;
  continue_picking_args *cpa;
  grpc_closure *closure;

  GPR_ASSERT(connected_subchannel);

  gpr_mu_lock(&chand->mu);
  if (initial_metadata == NULL) {
    if (chand->lb_policy != NULL) {
      grpc_lb_policy_cancel_pick(exec_ctx, chand->lb_policy,
                                 connected_subchannel);
    }
    for (closure = chand->waiting_for_config_closures.head; closure != NULL;
         closure = closure->next_data.next) {
      cpa = closure->cb_arg;
      if (cpa->connected_subchannel == connected_subchannel) {
        cpa->connected_subchannel = NULL;
        grpc_exec_ctx_sched(exec_ctx, cpa->on_ready,
                            GRPC_ERROR_CREATE("Pick cancelled"), NULL);
      }
    }
    gpr_mu_unlock(&chand->mu);
    GPR_TIMER_END("pick_subchannel", 0);
    return true;
  }
  if (chand->lb_policy != NULL) {
    grpc_lb_policy *lb_policy = chand->lb_policy;
    int r;
    GRPC_LB_POLICY_REF(lb_policy, "pick_subchannel");
    gpr_mu_unlock(&chand->mu);
    const grpc_lb_policy_pick_args inputs = {calld->pollent, initial_metadata,
                                             initial_metadata_flags,
                                             &calld->lb_token_mdelem};
    r = grpc_lb_policy_pick(exec_ctx, lb_policy, &inputs, connected_subchannel,
                            NULL, on_ready);
    GRPC_LB_POLICY_UNREF(exec_ctx, lb_policy, "pick_subchannel");
    GPR_TIMER_END("pick_subchannel", 0);
    return r;
  }
  if (chand->resolver != NULL && !chand->started_resolving) {
    chand->started_resolving = true;
    GRPC_CHANNEL_STACK_REF(chand->owning_stack, "resolver");
    grpc_resolver_next(exec_ctx, chand->resolver, &chand->resolver_result,
                       &chand->on_resolver_result_changed);
  }
  if (chand->resolver != NULL) {
    cpa = gpr_malloc(sizeof(*cpa));
    cpa->initial_metadata = initial_metadata;
    cpa->initial_metadata_flags = initial_metadata_flags;
    cpa->connected_subchannel = connected_subchannel;
    cpa->on_ready = on_ready;
    cpa->elem = elem;
    grpc_closure_init(&cpa->closure, continue_picking, cpa);
    grpc_closure_list_append(&chand->waiting_for_config_closures, &cpa->closure,
                             GRPC_ERROR_NONE);
  } else {
    grpc_exec_ctx_sched(exec_ctx, on_ready, GRPC_ERROR_CREATE("Disconnected"),
                        NULL);
  }
  gpr_mu_unlock(&chand->mu);

  GPR_TIMER_END("pick_subchannel", 0);
  return false;
}