Update with the new ping implementation

2 files changed, 97 insertions, 75 deletions

diff --git a/src/core/ext/transport/chttp2/transport/chttp2_transport.c b/src/core/ext/transport/chttp2/transport/chttp2_transport.c
index 10dc6e6ff6..f9ee71fb11 100644
--- a/src/core/ext/transport/chttp2/transport/chttp2_transport.c
+++ b/src/core/ext/transport/chttp2/transport/chttp2_transport.c
@@ -147,10 +147,12 @@ static void send_ping_locked(grpc_exec_ctx *exec_ctx, grpc_chttp2_transport *t,
 #define DEFAULT_MAX_PINGS_BETWEEN_DATA 3
 
 /** keepalive-relevant functions */
-static void keepalive_ping_locked(grpc_exec_ctx *exec_ctx, void *arg,
-                                  grpc_error *error);
-static void keepalive_ping_ack_locked(grpc_exec_ctx *exec_ctx, void *arg,
-                                      grpc_error *error);
+static void init_keepalive_ping_locked(grpc_exec_ctx *exec_ctx, void *arg,
+                                       grpc_error *error);
+static void start_keepalive_ping_locked(grpc_exec_ctx *exec_ctx, void *arg,
+                                        grpc_error *error);
+static void finish_keepalive_ping_locked(grpc_exec_ctx *exec_ctx, void *arg,
+                                         grpc_error *error);
 static void keepalive_watchdog_fired_locked(grpc_exec_ctx *exec_ctx, void *arg,
                                             grpc_error *error);
 
@@ -224,73 +226,6 @@ void grpc_chttp2_unref_transport(grpc_exec_ctx *exec_ctx,
 void grpc_chttp2_ref_transport(grpc_chttp2_transport *t) { gpr_ref(&t->refs); }
 #endif
 
-static void keepalive_ping_locked(grpc_exec_ctx *exec_ctx, void *arg,
-                                  grpc_error *error) {
-  grpc_chttp2_transport *t = arg;
-  GPR_ASSERT(t->keepalive_state == GRPC_CHTTP2_KEEPALIVE_STATE_WAITING);
-  if (error == GRPC_ERROR_NONE && !(t->destroying || t->closed)) {
-    t->keepalive_state = GRPC_CHTTP2_KEEPALIVE_STATE_PINGING;
-    GRPC_CHTTP2_REF_TRANSPORT(t, "keepalive ping end");
-    t->keepalive_ping_id = send_ping_locked(
-        exec_ctx, t,
-        grpc_closure_create(keepalive_ping_ack_locked, t,
-                            grpc_combiner_scheduler(t->combiner, false)));
-    if (t->keepalive_permit_without_calls || t->stream_map.count > 0)
-      GRPC_CHTTP2_REF_TRANSPORT(t, "keepalive watchdog");
-    grpc_timer_init(
-        exec_ctx, &t->keepalive_watchdog_timer,
-        gpr_time_add(gpr_now(GPR_CLOCK_MONOTONIC), t->keepalive_timeout),
-        grpc_closure_create(keepalive_watchdog_fired_locked, t,
-                            grpc_combiner_scheduler(t->combiner, false)),
-        gpr_now(GPR_CLOCK_MONOTONIC));
-  }
-  GRPC_CHTTP2_UNREF_TRANSPORT(exec_ctx, t, "keepalive ping");
-}
-
-static void keepalive_ping_ack_locked(grpc_exec_ctx *exec_ctx, void *arg,
-                                      grpc_error *error) {
-  grpc_chttp2_transport *t = arg;
-  if (t->keepalive_state == GRPC_CHTTP2_KEEPALIVE_STATE_PINGING) {
-    if (error == GRPC_ERROR_NONE) {
-      t->keepalive_state = GRPC_CHTTP2_KEEPALIVE_STATE_WAITING;
-      t->keepalive_ping_id = NULL;
-      grpc_timer_cancel(exec_ctx, &t->keepalive_watchdog_timer);
-      GRPC_CHTTP2_REF_TRANSPORT(t, "keepalive ping");
-      grpc_timer_init(
-          exec_ctx, &t->keepalive_ping_timer,
-          gpr_time_add(gpr_now(GPR_CLOCK_MONOTONIC), t->keepalive_time),
-          grpc_closure_create(keepalive_ping_locked, t,
-                              grpc_combiner_scheduler(t->combiner, false)),
-          gpr_now(GPR_CLOCK_MONOTONIC));
-    }
-  } else {
-    GPR_ASSERT(t->keepalive_state == GRPC_CHTTP2_KEEPALIVE_STATE_DYING);
-  }
-  GRPC_CHTTP2_UNREF_TRANSPORT(exec_ctx, t, "keepalive ping end");
-}
-
-static void keepalive_watchdog_fired_locked(grpc_exec_ctx *exec_ctx, void *arg,
-                                            grpc_error *error) {
-  grpc_chttp2_transport *t = arg;
-  if (t->keepalive_state == GRPC_CHTTP2_KEEPALIVE_STATE_PINGING) {
-    if (error == GRPC_ERROR_NONE) {
-      t->keepalive_state = GRPC_CHTTP2_KEEPALIVE_STATE_DYING;
-      if (t->keepalive_ping_id != NULL) {
-        grpc_chttp2_ack_ping(exec_ctx, t, t->keepalive_ping_id);
-      }
-      close_transport_locked(exec_ctx, t,
-                             GRPC_ERROR_CREATE("keepalive watchdog timeout"));
-    }
-  } else {
-    // GRPC_LOG_IF_ERROR("keepalive_watchdog", error);
-    if (error != GRPC_ERROR_CANCELLED) {
-      gpr_log(GPR_ERROR, "keepalive_ping_end state error: %d (expect: %d)",
-              t->keepalive_state, GRPC_CHTTP2_KEEPALIVE_STATE_PINGING);
-    }
-  }
-  GRPC_CHTTP2_UNREF_TRANSPORT(exec_ctx, t, "keepalive watchdog");
-}
-
 static void init_transport(grpc_exec_ctx *exec_ctx, grpc_chttp2_transport *t,
                            const grpc_channel_args *channel_args,
                            grpc_endpoint *ep, bool is_client) {
@@ -337,6 +272,12 @@ static void init_transport(grpc_exec_ctx *exec_ctx, grpc_chttp2_transport *t,
                     grpc_combiner_scheduler(t->combiner, false));
   grpc_closure_init(&t->finish_bdp_ping_locked, finish_bdp_ping_locked, t,
                     grpc_combiner_scheduler(t->combiner, false));
+  grpc_closure_init(&t->start_keepalive_ping_locked,
+                    start_keepalive_ping_locked, t,
+                    grpc_combiner_scheduler(t->combiner, false));
+  grpc_closure_init(&t->finish_keepalive_ping_locked,
+                    finish_keepalive_ping_locked, t,
+                    grpc_combiner_scheduler(t->combiner, false));
 
   grpc_bdp_estimator_init(&t->bdp_estimator, t->peer_string);
   t->last_pid_update = gpr_now(GPR_CLOCK_MONOTONIC);
@@ -400,9 +341,14 @@ static void init_transport(grpc_exec_ctx *exec_ctx, grpc_chttp2_transport *t,
 
   /* client-side keepalive setting */
   t->keepalive_time =
-      gpr_time_from_seconds(DEFAULT_KEEPALIVE_TIME_SECOND, GPR_TIMESPAN);
+      DEFAULT_KEEPALIVE_TIME_SECOND == INT_MAX
+          ? gpr_inf_future(GPR_TIMESPAN)
+          : gpr_time_from_seconds(DEFAULT_KEEPALIVE_TIME_SECOND, GPR_TIMESPAN);
   t->keepalive_timeout =
-      gpr_time_from_seconds(DEFAULT_KEEPALIVE_TIMEOUT_SECOND, GPR_TIMESPAN);
+      DEFAULT_KEEPALIVE_TIMEOUT_SECOND == INT_MAX
+          ? gpr_inf_future(GPR_TIMESPAN)
+          : gpr_time_from_seconds(DEFAULT_KEEPALIVE_TIMEOUT_SECOND,
+                                  GPR_TIMESPAN);
   t->keepalive_permit_without_calls = DEFAULT_KEEPALIVE_PERMIT_WITHOUT_CALLS;
 
   if (channel_args) {
@@ -529,11 +475,11 @@ static void init_transport(grpc_exec_ctx *exec_ctx, grpc_chttp2_transport *t,
   // Start client-side keepalive pings
   if (t->is_client) {
     t->keepalive_state = GRPC_CHTTP2_KEEPALIVE_STATE_WAITING;
-    GRPC_CHTTP2_REF_TRANSPORT(t, "keepalive ping");
+    GRPC_CHTTP2_REF_TRANSPORT(t, "init keepalive ping");
     grpc_timer_init(
         exec_ctx, &t->keepalive_ping_timer,
         gpr_time_add(gpr_now(GPR_CLOCK_MONOTONIC), t->keepalive_time),
-        grpc_closure_create(keepalive_ping_locked, t,
+        grpc_closure_create(init_keepalive_ping_locked, t,
                             grpc_combiner_scheduler(t->combiner, false)),
         gpr_now(GPR_CLOCK_MONOTONIC));
   }
@@ -2127,6 +2073,80 @@ static void finish_bdp_ping_locked(grpc_exec_ctx *exec_ctx, void *tp,
   GRPC_CHTTP2_UNREF_TRANSPORT(exec_ctx, t, "bdp_ping");
 }
 
+static void init_keepalive_ping_locked(grpc_exec_ctx *exec_ctx, void *arg,
+                                       grpc_error *error) {
+  grpc_chttp2_transport *t = arg;
+  GPR_ASSERT(t->keepalive_state == GRPC_CHTTP2_KEEPALIVE_STATE_WAITING);
+  if (error == GRPC_ERROR_NONE && !(t->destroying || t->closed)) {
+    if (t->keepalive_permit_without_calls || t->stream_map.count > 0) {
+      t->keepalive_state = GRPC_CHTTP2_KEEPALIVE_STATE_PINGING;
+      GRPC_CHTTP2_REF_TRANSPORT(t, "keepalive ping end");
+      send_ping_locked(exec_ctx, t, GRPC_CHTTP2_PING_ON_NEXT_WRITE,
+                       &t->start_keepalive_ping_locked,
+                       &t->finish_keepalive_ping_locked);
+    } else {
+      GRPC_CHTTP2_REF_TRANSPORT(t, "init keepalive ping");
+      grpc_timer_init(
+          exec_ctx, &t->keepalive_ping_timer,
+          gpr_time_add(gpr_now(GPR_CLOCK_MONOTONIC), t->keepalive_time),
+          grpc_closure_create(init_keepalive_ping_locked, t,
+                              grpc_combiner_scheduler(t->combiner, false)),
+          gpr_now(GPR_CLOCK_MONOTONIC));
+    }
+  }
+  GRPC_CHTTP2_UNREF_TRANSPORT(exec_ctx, t, "init keepalive ping");
+}
+
+static void start_keepalive_ping_locked(grpc_exec_ctx *exec_ctx, void *arg,
+                                        grpc_error *error) {
+  grpc_chttp2_transport *t = arg;
+  GRPC_CHTTP2_REF_TRANSPORT(t, "keepalive watchdog");
+  grpc_timer_init(
+      exec_ctx, &t->keepalive_watchdog_timer,
+      gpr_time_add(gpr_now(GPR_CLOCK_MONOTONIC), t->keepalive_timeout),
+      grpc_closure_create(keepalive_watchdog_fired_locked, t,
+                          grpc_combiner_scheduler(t->combiner, false)),
+      gpr_now(GPR_CLOCK_MONOTONIC));
+}
+
+static void finish_keepalive_ping_locked(grpc_exec_ctx *exec_ctx, void *arg,
+                                         grpc_error *error) {
+  grpc_chttp2_transport *t = arg;
+  if (t->keepalive_state == GRPC_CHTTP2_KEEPALIVE_STATE_PINGING) {
+    if (error == GRPC_ERROR_NONE) {
+      t->keepalive_state = GRPC_CHTTP2_KEEPALIVE_STATE_WAITING;
+      grpc_timer_cancel(exec_ctx, &t->keepalive_watchdog_timer);
+      GRPC_CHTTP2_REF_TRANSPORT(t, "init keepalive ping");
+      grpc_timer_init(
+          exec_ctx, &t->keepalive_ping_timer,
+          gpr_time_add(gpr_now(GPR_CLOCK_MONOTONIC), t->keepalive_time),
+          grpc_closure_create(init_keepalive_ping_locked, t,
+                              grpc_combiner_scheduler(t->combiner, false)),
+          gpr_now(GPR_CLOCK_MONOTONIC));
+    }
+  }
+  GRPC_CHTTP2_UNREF_TRANSPORT(exec_ctx, t, "keepalive ping end");
+}
+
+static void keepalive_watchdog_fired_locked(grpc_exec_ctx *exec_ctx, void *arg,
+                                            grpc_error *error) {
+  grpc_chttp2_transport *t = arg;
+  if (t->keepalive_state == GRPC_CHTTP2_KEEPALIVE_STATE_PINGING) {
+    if (error == GRPC_ERROR_NONE) {
+      t->keepalive_state = GRPC_CHTTP2_KEEPALIVE_STATE_DYING;
+      close_transport_locked(exec_ctx, t,
+                             GRPC_ERROR_CREATE("keepalive watchdog timeout"));
+    }
+  } else {
+    // The watchdog timer should have been cancelled.
+    if (error != GRPC_ERROR_CANCELLED) {
+      gpr_log(GPR_ERROR, "keepalive_ping_end state error: %d (expect: %d)",
+              t->keepalive_state, GRPC_CHTTP2_KEEPALIVE_STATE_PINGING);
+    }
+  }
+  GRPC_CHTTP2_UNREF_TRANSPORT(exec_ctx, t, "keepalive watchdog");
+}
+
 /*******************************************************************************
  * CALLBACK LOOP
  */
diff --git a/src/core/ext/transport/chttp2/transport/internal.h b/src/core/ext/transport/chttp2/transport/internal.h
index 7fcab0a722..0e3e900da0 100644
--- a/src/core/ext/transport/chttp2/transport/internal.h
+++ b/src/core/ext/transport/chttp2/transport/internal.h
@@ -391,6 +391,8 @@ struct grpc_chttp2_transport {
   grpc_closure destructive_reclaimer_locked;
 
   /* keep-alive ping support */
+  grpc_closure start_keepalive_ping_locked;
+  grpc_closure finish_keepalive_ping_locked;
   /** timer to initiate ping events */
   grpc_timer keepalive_ping_timer;
   /** watchdog to kill the transport when waiting for the keepalive ping */