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Fix state tracking, refcounting bugs

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pull/2477/head
Craig Tiller 9 years ago
parent b5980be9a0
commit 03dc655d2e
9 changed files with 117 additions and 67 deletions
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  1. 24
      src/core/channel/client_channel.c
  2. 39
      src/core/client_config/lb_policies/pick_first.c
  3. 8
      src/core/client_config/lb_policy.c
  4. 10
      src/core/client_config/lb_policy.h
  5. 40
      src/core/client_config/subchannel.c
  6. 5
      src/core/iomgr/alarm.c
  7. 15
      src/core/transport/chttp2_transport.c
  8. 34
      src/core/transport/connectivity_state.c
  9. 9
      src/core/transport/connectivity_state.h

24
src/core/channel/client_channel.c
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@ -414,7 +414,8 @@ static void on_lb_policy_state_changed(void *arg, int iomgr_success) {
gpr_mu_lock(&w->chand->mu_config);
/* check if the notification is for a stale policy */
if (w->lb_policy == w->chand->lb_policy) {
grpc_connectivity_state_set(&w->chand->state_tracker, w->state);
grpc_connectivity_state_set(&w->chand->state_tracker, w->state,
"lb_changed");
start_new = (w->state != GRPC_CHANNEL_FATAL_FAILURE);
}
gpr_mu_unlock(&w->chand->mu_config);
@ -481,7 +482,8 @@ static void cc_on_config_changed(void *arg, int iomgr_success) {
grpc_resolver_next(resolver, &chand->incoming_configuration,
&chand->on_config_changed);
GRPC_RESOLVER_UNREF(resolver, "channel-next");
grpc_connectivity_state_set(&chand->state_tracker, state);
grpc_connectivity_state_set(&chand->state_tracker, state,
"new_lb+resolver");
if (lb_policy != NULL) {
watch_lb_policy(chand, lb_policy, state);
}
@ -489,7 +491,7 @@ static void cc_on_config_changed(void *arg, int iomgr_success) {
old_resolver = chand->resolver;
chand->resolver = NULL;
grpc_connectivity_state_set(&chand->state_tracker,
GRPC_CHANNEL_FATAL_FAILURE);
GRPC_CHANNEL_FATAL_FAILURE, "resolver_gone");
gpr_mu_unlock(&chand->mu_config);
if (old_resolver != NULL) {
grpc_resolver_shutdown(old_resolver);
@ -538,9 +540,16 @@ static void cc_start_transport_op(grpc_channel_element *elem,
op->connectivity_state = NULL;
}
if (!is_empty(op, sizeof(*op))) {
lb_policy = chand->lb_policy;
if (lb_policy) {
GRPC_LB_POLICY_REF(lb_policy, "broadcast");
}
}
if (op->disconnect && chand->resolver != NULL) {
grpc_connectivity_state_set(&chand->state_tracker,
GRPC_CHANNEL_FATAL_FAILURE);
GRPC_CHANNEL_FATAL_FAILURE, "disconnect");
destroy_resolver = chand->resolver;
chand->resolver = NULL;
if (chand->lb_policy != NULL) {
@ -549,13 +558,6 @@ static void cc_start_transport_op(grpc_channel_element *elem,
chand->lb_policy = NULL;
}
}
if (!is_empty(op, sizeof(*op))) {
lb_policy = chand->lb_policy;
if (lb_policy) {
GRPC_LB_POLICY_REF(lb_policy, "broadcast");
}
}
gpr_mu_unlock(&chand->mu_config);
if (destroy_resolver) {

39
src/core/client_config/lb_policies/pick_first.c
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@ -116,7 +116,8 @@ void pf_shutdown(grpc_lb_policy *pol) {
grpc_iomgr_add_delayed_callback(pp->on_complete, 0);
gpr_free(pp);
}
grpc_connectivity_state_set(&p->state_tracker, GRPC_CHANNEL_FATAL_FAILURE);
grpc_connectivity_state_set(&p->state_tracker, GRPC_CHANNEL_FATAL_FAILURE,
"shutdown");
gpr_mu_unlock(&p->mu);
}
@ -175,17 +176,20 @@ static void pf_connectivity_changed(void *arg, int iomgr_success) {
if (p->shutdown) {
unref = 1;
} else if (p->selected != NULL) {
grpc_connectivity_state_set(&p->state_tracker, p->checking_connectivity);
grpc_connectivity_state_set(&p->state_tracker, p->checking_connectivity,
"selected_changed");
if (p->checking_connectivity != GRPC_CHANNEL_FATAL_FAILURE) {
grpc_subchannel_notify_on_state_change(p->selected, &p->checking_connectivity, &p->connectivity_changed);
grpc_subchannel_notify_on_state_change(
p->selected, &p->checking_connectivity, &p->connectivity_changed);
} else {
unref = 1;
}
} else {
loop:
loop:
switch (p->checking_connectivity) {
case GRPC_CHANNEL_READY:
grpc_connectivity_state_set(&p->state_tracker, GRPC_CHANNEL_READY);
grpc_connectivity_state_set(&p->state_tracker, GRPC_CHANNEL_READY,
"connecting_ready");
p->selected = p->subchannels[p->checking_subchannel];
while ((pp = p->pending_picks)) {
p->pending_picks = pp->next;
@ -194,10 +198,13 @@ loop:
grpc_iomgr_add_delayed_callback(pp->on_complete, 1);
gpr_free(pp);
}
grpc_subchannel_notify_on_state_change(p->selected, &p->checking_connectivity, &p->connectivity_changed);
grpc_subchannel_notify_on_state_change(
p->selected, &p->checking_connectivity, &p->connectivity_changed);
break;
case GRPC_CHANNEL_TRANSIENT_FAILURE:
grpc_connectivity_state_set(&p->state_tracker, GRPC_CHANNEL_TRANSIENT_FAILURE);
grpc_connectivity_state_set(&p->state_tracker,
GRPC_CHANNEL_TRANSIENT_FAILURE,
"connecting_transient_failure");
del_interested_parties_locked(p);
p->checking_subchannel =
(p->checking_subchannel + 1) % p->num_subchannels;
@ -205,14 +212,17 @@ loop:
p->subchannels[p->checking_subchannel]);
add_interested_parties_locked(p);
if (p->checking_connectivity == GRPC_CHANNEL_TRANSIENT_FAILURE) {
grpc_subchannel_notify_on_state_change(p->subchannels[p->checking_subchannel], &p->checking_connectivity, &p->connectivity_changed);
grpc_subchannel_notify_on_state_change(
p->subchannels[p->checking_subchannel], &p->checking_connectivity,
&p->connectivity_changed);
} else {
goto loop;
}
break;
case GRPC_CHANNEL_CONNECTING:
case GRPC_CHANNEL_IDLE:
grpc_connectivity_state_set(&p->state_tracker, p->checking_connectivity);
grpc_connectivity_state_set(&p->state_tracker, p->checking_connectivity,
"connecting_changed");
grpc_subchannel_notify_on_state_change(
p->subchannels[p->checking_subchannel], &p->checking_connectivity,
&p->connectivity_changed);
@ -224,7 +234,9 @@ loop:
p->num_subchannels--;
GRPC_SUBCHANNEL_UNREF(p->subchannels[p->num_subchannels], "pick_first");
if (p->num_subchannels == 0) {
grpc_connectivity_state_set(&p->state_tracker, GRPC_CHANNEL_FATAL_FAILURE);
grpc_connectivity_state_set(&p->state_tracker,
GRPC_CHANNEL_FATAL_FAILURE,
"no_more_channels");
while ((pp = p->pending_picks)) {
p->pending_picks = pp->next;
*pp->target = NULL;
@ -233,7 +245,9 @@ loop:
}
unref = 1;
} else {
grpc_connectivity_state_set(&p->state_tracker, GRPC_CHANNEL_TRANSIENT_FAILURE);
grpc_connectivity_state_set(&p->state_tracker,
GRPC_CHANNEL_TRANSIENT_FAILURE,
"subchannel_failed");
p->checking_subchannel %= p->num_subchannels;
p->checking_connectivity = grpc_subchannel_check_connectivity(
p->subchannels[p->checking_subchannel]);
@ -308,7 +322,8 @@ grpc_lb_policy *grpc_create_pick_first_lb_policy(grpc_subchannel **subchannels,
grpc_lb_policy_init(&p->base, &pick_first_lb_policy_vtable);
p->subchannels = gpr_malloc(sizeof(grpc_subchannel *) * num_subchannels);
p->num_subchannels = num_subchannels;
grpc_connectivity_state_init(&p->state_tracker, GRPC_CHANNEL_IDLE, "pick_first");
grpc_connectivity_state_init(&p->state_tracker, GRPC_CHANNEL_IDLE,
"pick_first");
memcpy(p->subchannels, subchannels,
sizeof(grpc_subchannel *) * num_subchannels);
grpc_iomgr_closure_init(&p->connectivity_changed, pf_connectivity_changed, p);

8
src/core/client_config/lb_policy.c
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@ -82,11 +82,13 @@ void grpc_lb_policy_exit_idle(grpc_lb_policy *policy) {
policy->vtable->exit_idle(policy);
}
void grpc_lb_policy_notify_on_state_change(grpc_lb_policy *policy, grpc_connectivity_state *state,
grpc_iomgr_closure *closure) {
void grpc_lb_policy_notify_on_state_change(grpc_lb_policy *policy,
grpc_connectivity_state *state,
grpc_iomgr_closure *closure) {
policy->vtable->notify_on_state_change(policy, state, closure);
}
grpc_connectivity_state grpc_lb_policy_check_connectivity(grpc_lb_policy *policy) {
grpc_connectivity_state grpc_lb_policy_check_connectivity(
grpc_lb_policy *policy) {
return policy->vtable->check_connectivity(policy);
}

10
src/core/client_config/lb_policy.h
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@ -75,6 +75,8 @@ struct grpc_lb_policy_vtable {
grpc_iomgr_closure *closure);
};
#define GRPC_LB_POLICY_REFCOUNT_DEBUG
#ifdef GRPC_LB_POLICY_REFCOUNT_DEBUG
#define GRPC_LB_POLICY_REF(p, r) \
grpc_lb_policy_ref((p), __FILE__, __LINE__, (r))
@ -111,9 +113,11 @@ void grpc_lb_policy_broadcast(grpc_lb_policy *policy, grpc_transport_op *op);
void grpc_lb_policy_exit_idle(grpc_lb_policy *policy);
void grpc_lb_policy_notify_on_state_change(grpc_lb_policy *policy, grpc_connectivity_state *state,
grpc_iomgr_closure *closure);
void grpc_lb_policy_notify_on_state_change(grpc_lb_policy *policy,
grpc_connectivity_state *state,
grpc_iomgr_closure *closure);
grpc_connectivity_state grpc_lb_policy_check_connectivity(grpc_lb_policy *policy);
grpc_connectivity_state grpc_lb_policy_check_connectivity(
grpc_lb_policy *policy);
#endif /* GRPC_INTERNAL_CORE_CONFIG_LB_POLICY_H */

40
src/core/client_config/subchannel.c
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@ -96,7 +96,8 @@ struct grpc_subchannel {
grpc_iomgr_closure connected;
/** pollset_set tracking who's interested in a connection
being setup - owned by the master channel (in particular the client_channel
being setup - owned by the master channel (in particular the
client_channel
filter there-in) */
grpc_pollset_set *pollset_set;
@ -135,7 +136,8 @@ struct grpc_subchannel_call {
#define CHANNEL_STACK_FROM_CONNECTION(con) ((grpc_channel_stack *)((con) + 1))
static grpc_subchannel_call *create_call(connection *con);
static void connectivity_state_changed_locked(grpc_subchannel *c);
static void connectivity_state_changed_locked(grpc_subchannel *c,
const char *reason);
static grpc_connectivity_state compute_connectivity_locked(grpc_subchannel *c);
static gpr_timespec compute_connect_deadline(grpc_subchannel *c);
static void subchannel_connected(void *subchannel, int iomgr_success);
@ -265,7 +267,8 @@ void grpc_subchannel_del_interested_party(grpc_subchannel *c,
grpc_subchannel *grpc_subchannel_create(grpc_connector *connector,
grpc_subchannel_args *args) {
grpc_subchannel *c = gpr_malloc(sizeof(*c));
grpc_channel_element *parent_elem = grpc_channel_stack_last_element(grpc_channel_get_channel_stack(args->master));
grpc_channel_element *parent_elem = grpc_channel_stack_last_element(
grpc_channel_get_channel_stack(args->master));
memset(c, 0, sizeof(*c));
c->refs = 1;
c->connector = connector;
@ -283,7 +286,8 @@ grpc_subchannel *grpc_subchannel_create(grpc_connector *connector,
c->pollset_set = grpc_client_channel_get_connecting_pollset_set(parent_elem);
grpc_mdctx_ref(c->mdctx);
grpc_iomgr_closure_init(&c->connected, subchannel_connected, c);
grpc_connectivity_state_init(&c->state_tracker, GRPC_CHANNEL_IDLE, "subchannel");
grpc_connectivity_state_init(&c->state_tracker, GRPC_CHANNEL_IDLE,
"subchannel");
gpr_mu_init(&c->mu);
return c;
}
@ -345,7 +349,7 @@ void grpc_subchannel_create_call(grpc_subchannel *c, grpc_pollset *pollset,
grpc_subchannel_add_interested_party(c, pollset);
if (!c->connecting) {
c->connecting = 1;
connectivity_state_changed_locked(c);
connectivity_state_changed_locked(c, "create_call");
/* released by connection */
SUBCHANNEL_REF_LOCKED(c, "connecting");
GRPC_CHANNEL_INTERNAL_REF(c->master, "connecting");
@ -378,7 +382,7 @@ void grpc_subchannel_notify_on_state_change(grpc_subchannel *c,
/* released by connection */
SUBCHANNEL_REF_LOCKED(c, "connecting");
GRPC_CHANNEL_INTERNAL_REF(c->master, "connecting");
connectivity_state_changed_locked(c);
connectivity_state_changed_locked(c, "state_change");
}
gpr_mu_unlock(&c->mu);
if (do_connect) {
@ -394,7 +398,7 @@ void grpc_subchannel_process_transport_op(grpc_subchannel *c,
gpr_mu_lock(&c->mu);
if (op->disconnect) {
c->disconnected = 1;
connectivity_state_changed_locked(c);
connectivity_state_changed_locked(c, "disconnect");
if (c->have_alarm) {
cancel_alarm = 1;
}
@ -462,13 +466,15 @@ static void on_state_changed(void *p, int iomgr_success) {
destroy_connection = sw->subchannel->active;
}
sw->subchannel->active = NULL;
grpc_connectivity_state_set(&c->state_tracker,
GRPC_CHANNEL_TRANSIENT_FAILURE);
grpc_connectivity_state_set(
&c->state_tracker, c->disconnected ? GRPC_CHANNEL_FATAL_FAILURE
: GRPC_CHANNEL_TRANSIENT_FAILURE,
"connection_failed");
break;
}
done:
connectivity_state_changed_locked(c);
connectivity_state_changed_locked(c, "transport_state_changed");
destroy = SUBCHANNEL_UNREF_LOCKED(c, "state_watcher");
gpr_free(sw);
gpr_mu_unlock(mu);
@ -555,7 +561,7 @@ static void publish_transport(grpc_subchannel *c) {
elem->filter->start_transport_op(elem, &op);
/* signal completion */
connectivity_state_changed_locked(c);
connectivity_state_changed_locked(c, "connected");
while ((w4c = c->waiting)) {
c->waiting = w4c->next;
grpc_iomgr_add_callback(&w4c->continuation);
@ -579,7 +585,7 @@ static void on_alarm(void *arg, int iomgr_success) {
if (c->disconnected) {
iomgr_success = 0;
}
connectivity_state_changed_locked(c);
connectivity_state_changed_locked(c, "alarm");
gpr_mu_unlock(&c->mu);
if (iomgr_success) {
continue_connect(c);
@ -598,9 +604,10 @@ static void subchannel_connected(void *arg, int iomgr_success) {
gpr_mu_lock(&c->mu);
GPR_ASSERT(!c->have_alarm);
c->have_alarm = 1;
connectivity_state_changed_locked(c);
connectivity_state_changed_locked(c, "connect_failed");
c->next_attempt = gpr_time_add(c->next_attempt, c->backoff_delta);
if (gpr_time_cmp(c->backoff_delta, gpr_time_from_seconds(60)) < 0) {
if (gpr_time_cmp(c->backoff_delta,
gpr_time_from_seconds(60, GPR_TIMESPAN)) < 0) {
c->backoff_delta = gpr_time_add(c->backoff_delta, c->backoff_delta);
}
gpr_log(GPR_DEBUG, "wait: %d.%09d %d.%09d %d.%09d", now.tv_sec, now.tv_nsec,
@ -631,9 +638,10 @@ static grpc_connectivity_state compute_connectivity_locked(grpc_subchannel *c) {
return GRPC_CHANNEL_IDLE;
}
static void connectivity_state_changed_locked(grpc_subchannel *c) {
static void connectivity_state_changed_locked(grpc_subchannel *c,
const char *reason) {
grpc_connectivity_state current = compute_connectivity_locked(c);
grpc_connectivity_state_set(&c->state_tracker, current);
grpc_connectivity_state_set(&c->state_tracker, current, reason);
}
/*

5
src/core/iomgr/alarm.c
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@ -355,8 +355,9 @@ static int run_some_expired_alarms(gpr_mu *drop_mu, gpr_timespec now,
}
int grpc_alarm_check(gpr_mu *drop_mu, gpr_timespec now, gpr_timespec *next) {
return run_some_expired_alarms(drop_mu, now, next,
gpr_time_cmp(now, gpr_inf_future) != 0);
return run_some_expired_alarms(
drop_mu, now, next,
gpr_time_cmp(now, gpr_inf_future(GPR_CLOCK_REALTIME)) != 0);
}
gpr_timespec grpc_alarm_list_next_timeout(void) {

15
src/core/transport/chttp2_transport.c
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@ -119,7 +119,7 @@ static void maybe_start_some_streams(
static void connectivity_state_set(
grpc_chttp2_transport_global *transport_global,
grpc_connectivity_state state);
grpc_connectivity_state state, const char *reason);
/*
* CONSTRUCTION/DESTRUCTION/REFCOUNTING
@ -329,7 +329,8 @@ static void destroy_transport(grpc_transport *gt) {
static void close_transport_locked(grpc_chttp2_transport *t) {
if (!t->closed) {
t->closed = 1;
connectivity_state_set(&t->global, GRPC_CHANNEL_FATAL_FAILURE);
connectivity_state_set(&t->global, GRPC_CHANNEL_FATAL_FAILURE,
"close_transport");
if (t->ep) {
grpc_endpoint_shutdown(t->ep);
}
@ -532,7 +533,8 @@ void grpc_chttp2_add_incoming_goaway(
gpr_free(msg);
gpr_slice_unref(goaway_text);
transport_global->seen_goaway = 1;
connectivity_state_set(transport_global, GRPC_CHANNEL_FATAL_FAILURE);
connectivity_state_set(transport_global, GRPC_CHANNEL_FATAL_FAILURE,
"got_goaway");
}
static void maybe_start_some_streams(
@ -557,7 +559,8 @@ static void maybe_start_some_streams(
transport_global->next_stream_id += 2;
if (transport_global->next_stream_id >= MAX_CLIENT_STREAM_ID) {
connectivity_state_set(transport_global, GRPC_CHANNEL_TRANSIENT_FAILURE);
connectivity_state_set(transport_global, GRPC_CHANNEL_TRANSIENT_FAILURE,
"no_more_stream_ids");
}
stream_global->outgoing_window =
@ -1012,12 +1015,12 @@ static void schedule_closure_for_connectivity(void *a,
static void connectivity_state_set(
grpc_chttp2_transport_global *transport_global,
grpc_connectivity_state state) {
grpc_connectivity_state state, const char *reason) {
GRPC_CHTTP2_IF_TRACING(
gpr_log(GPR_DEBUG, "set connectivity_state=%d", state));
grpc_connectivity_state_set_with_scheduler(
&TRANSPORT_FROM_GLOBAL(transport_global)->channel_callback.state_tracker,
state, schedule_closure_for_connectivity, transport_global);
state, schedule_closure_for_connectivity, transport_global, reason);
}
void grpc_chttp2_schedule_closure(

34
src/core/transport/connectivity_state.c
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@ -40,18 +40,24 @@ int grpc_connectivity_state_trace = 0;
const char *grpc_connectivity_state_name(grpc_connectivity_state state) {
switch (state) {
case GRPC_CHANNEL_IDLE: return "IDLE";
case GRPC_CHANNEL_CONNECTING: return "CONNECTING";
case GRPC_CHANNEL_READY: return "READY";
case GRPC_CHANNEL_TRANSIENT_FAILURE: return "TRANSIENT_FAILURE";
case GRPC_CHANNEL_FATAL_FAILURE: return "FATAL_FAILURE";
case GRPC_CHANNEL_IDLE:
return "IDLE";
case GRPC_CHANNEL_CONNECTING:
return "CONNECTING";
case GRPC_CHANNEL_READY:
return "READY";
case GRPC_CHANNEL_TRANSIENT_FAILURE:
return "TRANSIENT_FAILURE";
case GRPC_CHANNEL_FATAL_FAILURE:
return "FATAL_FAILURE";
}
abort();
return "UNKNOWN";
}
void grpc_connectivity_state_init(grpc_connectivity_state_tracker *tracker,
grpc_connectivity_state init_state, const char *name) {
grpc_connectivity_state init_state,
const char *name) {
tracker->current_state = init_state;
tracker->watchers = NULL;
tracker->name = gpr_strdup(name);
@ -82,7 +88,9 @@ int grpc_connectivity_state_notify_on_state_change(
grpc_connectivity_state_tracker *tracker, grpc_connectivity_state *current,
grpc_iomgr_closure *notify) {
if (grpc_connectivity_state_trace) {
gpr_log(GPR_DEBUG, "CONWATCH: %s: from %s [cur=%s]", tracker->name, grpc_connectivity_state_name(*current), grpc_connectivity_state_name(tracker->current_state));
gpr_log(GPR_DEBUG, "CONWATCH: %s: from %s [cur=%s]", tracker->name,
grpc_connectivity_state_name(*current),
grpc_connectivity_state_name(tracker->current_state));
}
if (tracker->current_state != *current) {
*current = tracker->current_state;
@ -99,11 +107,14 @@ int grpc_connectivity_state_notify_on_state_change(
void grpc_connectivity_state_set_with_scheduler(
grpc_connectivity_state_tracker *tracker, grpc_connectivity_state state,
void (*scheduler)(void *arg, grpc_iomgr_closure *closure), void *arg) {
void (*scheduler)(void *arg, grpc_iomgr_closure *closure), void *arg,
const char *reason) {
grpc_connectivity_state_watcher *new = NULL;
grpc_connectivity_state_watcher *w;
if (grpc_connectivity_state_trace) {
gpr_log(GPR_DEBUG, "SET: %s: %s --> %s", tracker->name, grpc_connectivity_state_name(tracker->current_state), grpc_connectivity_state_name(state));
gpr_log(GPR_DEBUG, "SET: %s: %s --> %s [%s]", tracker->name,
grpc_connectivity_state_name(tracker->current_state),
grpc_connectivity_state_name(state), reason);
}
if (tracker->current_state == state) {
return;
@ -130,7 +141,8 @@ static void default_scheduler(void *ignored, grpc_iomgr_closure *closure) {
}
void grpc_connectivity_state_set(grpc_connectivity_state_tracker *tracker,
grpc_connectivity_state state) {
grpc_connectivity_state state,
const char *reason) {
grpc_connectivity_state_set_with_scheduler(tracker, state, default_scheduler,
NULL);
NULL, reason);
}

9
src/core/transport/connectivity_state.h
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@ -58,14 +58,17 @@ typedef struct {
extern int grpc_connectivity_state_trace;
void grpc_connectivity_state_init(grpc_connectivity_state_tracker *tracker,
grpc_connectivity_state init_state, const char *name);
grpc_connectivity_state init_state,
const char *name);
void grpc_connectivity_state_destroy(grpc_connectivity_state_tracker *tracker);
void grpc_connectivity_state_set(grpc_connectivity_state_tracker *tracker,
grpc_connectivity_state state);
grpc_connectivity_state state,
const char *reason);
void grpc_connectivity_state_set_with_scheduler(
grpc_connectivity_state_tracker *tracker, grpc_connectivity_state state,
void (*scheduler)(void *arg, grpc_iomgr_closure *closure), void *arg);
void (*scheduler)(void *arg, grpc_iomgr_closure *closure), void *arg,
const char *reason);
grpc_connectivity_state grpc_connectivity_state_check(
grpc_connectivity_state_tracker *tracker);

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