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author | 2017-05-02 08:27:08 -0700 | |
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committer | 2017-05-02 08:27:08 -0700 | |
commit | 64a317cc3e249a1b81327807f3dd7b998e0d9b88 (patch) | |
tree | 25bfe0082ce40fbea1e1c174de80ab63cae60619 /src/core | |
parent | d8696e10238a7e35e25f363e16f921c6c642069a (diff) |
Code clean-up in client_channel.
Diffstat (limited to 'src/core')
-rw-r--r-- | src/core/ext/filters/client_channel/client_channel.c | 101 |
1 files changed, 43 insertions, 58 deletions
diff --git a/src/core/ext/filters/client_channel/client_channel.c b/src/core/ext/filters/client_channel/client_channel.c index 0463b25412..652d789ec4 100644 --- a/src/core/ext/filters/client_channel/client_channel.c +++ b/src/core/ext/filters/client_channel/client_channel.c @@ -760,12 +760,6 @@ static void cc_destroy_channel_elem(grpc_exec_ctx *exec_ctx, #define CANCELLED_CALL ((grpc_subchannel_call *)1) -typedef enum { - /* zero so that it can be default-initialized */ - GRPC_SUBCHANNEL_CALL_HOLDER_NOT_CREATING = 0, - GRPC_SUBCHANNEL_CALL_HOLDER_PICKING_SUBCHANNEL -} subchannel_creation_phase; - /** Call data. Holds a pointer to grpc_subchannel_call and the associated machinery to create such a pointer. Handles queueing of stream ops until a call object is ready, waiting @@ -793,7 +787,7 @@ typedef struct client_channel_call_data { gpr_atm subchannel_call; gpr_arena *arena; - subchannel_creation_phase creation_phase; + bool pick_pending; grpc_connected_subchannel *connected_subchannel; grpc_polling_entity *pollent; @@ -914,11 +908,10 @@ static void subchannel_ready_locked(grpc_exec_ctx *exec_ctx, void *arg, grpc_call_element *elem = arg; call_data *calld = elem->call_data; channel_data *chand = elem->channel_data; - GPR_ASSERT(calld->creation_phase == - GRPC_SUBCHANNEL_CALL_HOLDER_PICKING_SUBCHANNEL); + GPR_ASSERT(calld->pick_pending); + calld->pick_pending = false; 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, @@ -984,8 +977,7 @@ typedef struct { static bool pick_subchannel_locked( 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); + grpc_connected_subchannel **connected_subchannel, grpc_closure *on_ready); static void continue_picking_locked(grpc_exec_ctx *exec_ctx, void *arg, grpc_error *error) { @@ -997,49 +989,46 @@ static void continue_picking_locked(grpc_exec_ctx *exec_ctx, void *arg, } else { if (pick_subchannel_locked(exec_ctx, cpa->elem, cpa->initial_metadata, cpa->initial_metadata_flags, - cpa->connected_subchannel, cpa->on_ready, - GRPC_ERROR_NONE)) { + cpa->connected_subchannel, cpa->on_ready)) { grpc_closure_sched(exec_ctx, cpa->on_ready, GRPC_ERROR_NONE); } } gpr_free(cpa); } +static void cancel_pick_locked(grpc_exec_ctx *exec_ctx, grpc_call_element *elem, + grpc_error *error) { + channel_data *chand = elem->channel_data; + call_data *calld = elem->call_data; + if (chand->lb_policy != NULL) { + grpc_lb_policy_cancel_pick_locked(exec_ctx, chand->lb_policy, + &calld->connected_subchannel, + GRPC_ERROR_REF(error)); + } + for (grpc_closure *closure = chand->waiting_for_config_closures.head; + closure != NULL; closure = closure->next_data.next) { + continue_picking_args *cpa = closure->cb_arg; + if (cpa->connected_subchannel == &calld->connected_subchannel) { + cpa->connected_subchannel = NULL; + grpc_closure_sched(exec_ctx, cpa->on_ready, + GRPC_ERROR_CREATE_REFERENCING_FROM_STATIC_STRING( + "Pick cancelled", &error, 1)); + } + } + GRPC_ERROR_UNREF(error); +} + static bool pick_subchannel_locked( 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) { + 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); - if (initial_metadata == NULL) { - if (chand->lb_policy != NULL) { - grpc_lb_policy_cancel_pick_locked(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_closure_sched(exec_ctx, cpa->on_ready, - GRPC_ERROR_CREATE_REFERENCING_FROM_STATIC_STRING( - "Pick cancelled", &error, 1)); - } - } - GPR_TIMER_END("pick_subchannel", 0); - GRPC_ERROR_UNREF(error); - return true; - } - GPR_ASSERT(error == GRPC_ERROR_NONE); if (chand->lb_policy != NULL) { apply_final_configuration_locked(exec_ctx, elem); grpc_lb_policy *lb_policy = chand->lb_policy; @@ -1096,7 +1085,7 @@ static bool pick_subchannel_locked( &chand->on_resolver_result_changed); } if (chand->resolver != NULL) { - cpa = gpr_malloc(sizeof(*cpa)); + continue_picking_args *cpa = gpr_malloc(sizeof(*cpa)); cpa->initial_metadata = initial_metadata; cpa->initial_metadata_flags = initial_metadata_flags; cpa->connected_subchannel = connected_subchannel; @@ -1151,16 +1140,13 @@ static void start_transport_stream_op_batch_locked_inner( error to the caller when the first op does get passed down. */ calld->cancel_error = GRPC_ERROR_REF(op->payload->cancel_stream.cancel_error); - switch (calld->creation_phase) { - case GRPC_SUBCHANNEL_CALL_HOLDER_NOT_CREATING: - fail_locked(exec_ctx, calld, - GRPC_ERROR_REF(op->payload->cancel_stream.cancel_error)); - break; - case GRPC_SUBCHANNEL_CALL_HOLDER_PICKING_SUBCHANNEL: - pick_subchannel_locked( - exec_ctx, elem, NULL, 0, &calld->connected_subchannel, NULL, - GRPC_ERROR_REF(op->payload->cancel_stream.cancel_error)); - break; + if (calld->pick_pending) { + cancel_pick_locked( + exec_ctx, elem, + GRPC_ERROR_REF(op->payload->cancel_stream.cancel_error)); + } else { + fail_locked(exec_ctx, calld, + GRPC_ERROR_REF(op->payload->cancel_stream.cancel_error)); } grpc_transport_stream_op_batch_finish_with_failure( exec_ctx, op, @@ -1170,9 +1156,9 @@ static void start_transport_stream_op_batch_locked_inner( } } /* 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) { - calld->creation_phase = GRPC_SUBCHANNEL_CALL_HOLDER_PICKING_SUBCHANNEL; + if (!calld->pick_pending && calld->connected_subchannel == NULL && + op->send_initial_metadata) { + calld->pick_pending = true; grpc_closure_init(&calld->next_step, subchannel_ready_locked, elem, grpc_combiner_scheduler(chand->combiner, true)); GRPC_CALL_STACK_REF(calld->owning_call, "pick_subchannel"); @@ -1183,8 +1169,8 @@ static void start_transport_stream_op_batch_locked_inner( exec_ctx, elem, op->payload->send_initial_metadata.send_initial_metadata, op->payload->send_initial_metadata.send_initial_metadata_flags, - &calld->connected_subchannel, &calld->next_step, GRPC_ERROR_NONE)) { - calld->creation_phase = GRPC_SUBCHANNEL_CALL_HOLDER_NOT_CREATING; + &calld->connected_subchannel, &calld->next_step)) { + calld->pick_pending = false; GRPC_CALL_STACK_UNREF(exec_ctx, calld->owning_call, "pick_subchannel"); } else { grpc_polling_entity_add_to_pollset_set(exec_ctx, calld->pollent, @@ -1192,8 +1178,7 @@ static void start_transport_stream_op_batch_locked_inner( } } /* 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) { + if (!calld->pick_pending && calld->connected_subchannel != NULL) { grpc_subchannel_call *subchannel_call = NULL; const grpc_connected_subchannel_call_args call_args = { .pollent = calld->pollent, @@ -1349,7 +1334,7 @@ static void cc_destroy_call_elem(grpc_exec_ctx *exec_ctx, then_schedule_closure = NULL; GRPC_SUBCHANNEL_CALL_UNREF(exec_ctx, call, "client_channel_destroy_call"); } - GPR_ASSERT(calld->creation_phase == GRPC_SUBCHANNEL_CALL_HOLDER_NOT_CREATING); + GPR_ASSERT(!calld->pick_pending); GPR_ASSERT(calld->waiting_ops_count == 0); if (calld->connected_subchannel != NULL) { GRPC_CONNECTED_SUBCHANNEL_UNREF(exec_ctx, calld->connected_subchannel, |