diff options
Diffstat (limited to 'src/core/ext/filters/client_channel/lb_policy/pick_first/pick_first.cc')
-rw-r--r-- | src/core/ext/filters/client_channel/lb_policy/pick_first/pick_first.cc | 75 |
1 files changed, 19 insertions, 56 deletions
diff --git a/src/core/ext/filters/client_channel/lb_policy/pick_first/pick_first.cc b/src/core/ext/filters/client_channel/lb_policy/pick_first/pick_first.cc index 60385272cf..725b78d478 100644 --- a/src/core/ext/filters/client_channel/lb_policy/pick_first/pick_first.cc +++ b/src/core/ext/filters/client_channel/lb_policy/pick_first/pick_first.cc @@ -81,7 +81,7 @@ static void pf_shutdown_locked(grpc_lb_policy* pol, GRPC_CLOSURE_SCHED(pick->on_complete, GRPC_ERROR_NONE); } } else { - pick->connected_subchannel = nullptr; + pick->connected_subchannel.reset(); GRPC_CLOSURE_SCHED(pick->on_complete, GRPC_ERROR_REF(error)); } } @@ -111,7 +111,7 @@ static void pf_cancel_pick_locked(grpc_lb_policy* pol, while (pp != nullptr) { grpc_lb_policy_pick_state* next = pp->next; if (pp == pick) { - pick->connected_subchannel = nullptr; + pick->connected_subchannel.reset(); GRPC_CLOSURE_SCHED(pick->on_complete, GRPC_ERROR_CREATE_REFERENCING_FROM_STATIC_STRING( "Pick Cancelled", &error, 1)); @@ -176,8 +176,7 @@ static int pf_pick_locked(grpc_lb_policy* pol, pick_first_lb_policy* p = (pick_first_lb_policy*)pol; // If we have a selected subchannel already, return synchronously. if (p->selected != nullptr) { - pick->connected_subchannel = GRPC_CONNECTED_SUBCHANNEL_REF( - p->selected->connected_subchannel, "picked"); + pick->connected_subchannel = p->selected->connected_subchannel; return 1; } // No subchannel selected yet, so handle asynchronously. @@ -217,8 +216,7 @@ static void pf_ping_one_locked(grpc_lb_policy* pol, grpc_closure* on_initiate, grpc_closure* on_ack) { pick_first_lb_policy* p = (pick_first_lb_policy*)pol; if (p->selected) { - grpc_connected_subchannel_ping(p->selected->connected_subchannel, - on_initiate, on_ack); + p->selected->connected_subchannel->Ping(on_initiate, on_ack); } else { GRPC_CLOSURE_SCHED(on_initiate, GRPC_ERROR_CREATE_FROM_STATIC_STRING("Not connected")); @@ -297,8 +295,7 @@ static void pf_update_locked(grpc_lb_policy* policy, subchannel_list->num_subchannels); } if (p->selected->connected_subchannel != nullptr) { - sd->connected_subchannel = GRPC_CONNECTED_SUBCHANNEL_REF( - p->selected->connected_subchannel, "pf_update_includes_selected"); + sd->connected_subchannel = p->selected->connected_subchannel; } p->selected = sd; if (p->subchannel_list != nullptr) { @@ -410,8 +407,8 @@ static void pf_connectivity_changed_locked(void* arg, grpc_error* error) { // re-resolution is introduced. But we need to investigate whether we // really want to take any action instead of waiting for the selected // subchannel reconnecting. - if (sd->curr_connectivity_state == GRPC_CHANNEL_SHUTDOWN || - sd->curr_connectivity_state == GRPC_CHANNEL_TRANSIENT_FAILURE) { + GPR_ASSERT(sd->curr_connectivity_state != GRPC_CHANNEL_SHUTDOWN); + if (sd->curr_connectivity_state == GRPC_CHANNEL_TRANSIENT_FAILURE) { // If the selected channel goes bad, request a re-resolution. grpc_connectivity_state_set(&p->state_tracker, GRPC_CHANNEL_IDLE, GRPC_ERROR_NONE, @@ -419,20 +416,19 @@ static void pf_connectivity_changed_locked(void* arg, grpc_error* error) { p->started_picking = false; grpc_lb_policy_try_reresolve(&p->base, &grpc_lb_pick_first_trace, GRPC_ERROR_NONE); + // in transient failure. Rely on re-resolution to recover. + p->selected = nullptr; + grpc_lb_subchannel_data_stop_connectivity_watch(sd); + grpc_lb_subchannel_list_unref_for_connectivity_watch( + sd->subchannel_list, "pf_selected_shutdown"); + grpc_lb_subchannel_data_unref_subchannel( + sd, "pf_selected_shutdown"); // Unrefs connected subchannel } else { grpc_connectivity_state_set(&p->state_tracker, sd->curr_connectivity_state, GRPC_ERROR_REF(error), "selected_changed"); - } - if (sd->curr_connectivity_state != GRPC_CHANNEL_SHUTDOWN) { // Renew notification. grpc_lb_subchannel_data_start_connectivity_watch(sd); - } else { - p->selected = nullptr; - grpc_lb_subchannel_data_stop_connectivity_watch(sd); - grpc_lb_subchannel_list_unref_for_connectivity_watch( - sd->subchannel_list, "pf_selected_shutdown"); - grpc_lb_subchannel_data_unref_subchannel(sd, "pf_selected_shutdown"); } } return; @@ -450,6 +446,8 @@ static void pf_connectivity_changed_locked(void* arg, grpc_error* error) { case GRPC_CHANNEL_READY: { // Case 2. Promote p->latest_pending_subchannel_list to // p->subchannel_list. + sd->connected_subchannel = + grpc_subchannel_get_connected_subchannel(sd->subchannel); if (sd->subchannel_list == p->latest_pending_subchannel_list) { GPR_ASSERT(p->subchannel_list != nullptr); grpc_lb_subchannel_list_shutdown_and_unref(p->subchannel_list, @@ -460,9 +458,6 @@ static void pf_connectivity_changed_locked(void* arg, grpc_error* error) { // Cases 1 and 2. grpc_connectivity_state_set(&p->state_tracker, GRPC_CHANNEL_READY, GRPC_ERROR_NONE, "connecting_ready"); - sd->connected_subchannel = GRPC_CONNECTED_SUBCHANNEL_REF( - grpc_subchannel_get_connected_subchannel(sd->subchannel), - "connected"); p->selected = sd; if (grpc_lb_pick_first_trace.enabled()) { gpr_log(GPR_INFO, "Pick First %p selected subchannel %p", (void*)p, @@ -474,8 +469,7 @@ static void pf_connectivity_changed_locked(void* arg, grpc_error* error) { grpc_lb_policy_pick_state* pick; while ((pick = p->pending_picks)) { p->pending_picks = pick->next; - pick->connected_subchannel = GRPC_CONNECTED_SUBCHANNEL_REF( - p->selected->connected_subchannel, "picked"); + pick->connected_subchannel = p->selected->connected_subchannel; if (grpc_lb_pick_first_trace.enabled()) { gpr_log(GPR_INFO, "Servicing pending pick with selected subchannel %p", @@ -520,39 +514,8 @@ static void pf_connectivity_changed_locked(void* arg, grpc_error* error) { grpc_lb_subchannel_data_start_connectivity_watch(sd); break; } - case GRPC_CHANNEL_SHUTDOWN: { - grpc_lb_subchannel_data_stop_connectivity_watch(sd); - grpc_lb_subchannel_data_unref_subchannel(sd, "pf_candidate_shutdown"); - // Advance to next subchannel and check its state. - grpc_lb_subchannel_data* original_sd = sd; - do { - sd->subchannel_list->checking_subchannel = - (sd->subchannel_list->checking_subchannel + 1) % - sd->subchannel_list->num_subchannels; - sd = &sd->subchannel_list - ->subchannels[sd->subchannel_list->checking_subchannel]; - } while (sd->subchannel == nullptr && sd != original_sd); - if (sd == original_sd) { - grpc_lb_subchannel_list_unref_for_connectivity_watch( - sd->subchannel_list, "pf_exhausted_subchannels"); - if (sd->subchannel_list == p->subchannel_list) { - grpc_connectivity_state_set(&p->state_tracker, GRPC_CHANNEL_IDLE, - GRPC_ERROR_NONE, - "exhausted_subchannels+reresolve"); - p->started_picking = false; - grpc_lb_policy_try_reresolve(&p->base, &grpc_lb_pick_first_trace, - GRPC_ERROR_NONE); - } - } else { - if (sd->subchannel_list == p->subchannel_list) { - grpc_connectivity_state_set( - &p->state_tracker, GRPC_CHANNEL_TRANSIENT_FAILURE, - GRPC_ERROR_REF(error), "subchannel_failed"); - } - // Reuses the connectivity refs from the previous watch. - grpc_lb_subchannel_data_start_connectivity_watch(sd); - } - } + case GRPC_CHANNEL_SHUTDOWN: + GPR_UNREACHABLE_CODE(break); } } |