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Merge pull request #17495 from apolcyn/revise_ares_logging

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Put most c-ares logs under a tracer
pull/17529/head
apolcyn 6 years ago committed by GitHub
parent c542d44cb0 5ea2ed602b
commit 462d6143c9
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GPG Key ID: 4AEE18F83AFDEB23
3 changed files with 74 additions and 58 deletions
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  1. 40
      src/core/ext/filters/client_channel/resolver/dns/c_ares/dns_resolver_ares.cc
  2. 43
      src/core/ext/filters/client_channel/resolver/dns/c_ares/grpc_ares_ev_driver.cc
  3. 39
      src/core/ext/filters/client_channel/resolver/dns/c_ares/grpc_ares_wrapper.cc

40
src/core/ext/filters/client_channel/resolver/dns/c_ares/dns_resolver_ares.cc
Unescape View File

@ -170,7 +170,7 @@ AresDnsResolver::AresDnsResolver(const ResolverArgs& args)
} }
AresDnsResolver::~AresDnsResolver() { AresDnsResolver::~AresDnsResolver() {
gpr_log(GPR_DEBUG, "destroying AresDnsResolver"); GRPC_CARES_TRACE_LOG("resolver:%p destroying AresDnsResolver", this);
if (resolved_result_ != nullptr) { if (resolved_result_ != nullptr) {
grpc_channel_args_destroy(resolved_result_); grpc_channel_args_destroy(resolved_result_);
} }
@ -182,7 +182,8 @@ AresDnsResolver::~AresDnsResolver() {
void AresDnsResolver::NextLocked(grpc_channel_args** target_result, void AresDnsResolver::NextLocked(grpc_channel_args** target_result,
grpc_closure* on_complete) { grpc_closure* on_complete) {
gpr_log(GPR_DEBUG, "AresDnsResolver::NextLocked() is called."); GRPC_CARES_TRACE_LOG("resolver:%p AresDnsResolver::NextLocked() is called.",
this);
GPR_ASSERT(next_completion_ == nullptr); GPR_ASSERT(next_completion_ == nullptr);
next_completion_ = on_complete; next_completion_ = on_complete;
target_result_ = target_result; target_result_ = target_result;
@ -225,12 +226,14 @@ void AresDnsResolver::ShutdownLocked() {
void AresDnsResolver::OnNextResolutionLocked(void* arg, grpc_error* error) { void AresDnsResolver::OnNextResolutionLocked(void* arg, grpc_error* error) {
AresDnsResolver* r = static_cast<AresDnsResolver*>(arg); AresDnsResolver* r = static_cast<AresDnsResolver*>(arg);
GRPC_CARES_TRACE_LOG( GRPC_CARES_TRACE_LOG(
"%p re-resolution timer fired. error: %s. shutdown_initiated_: %d", r, "resolver:%p re-resolution timer fired. error: %s. shutdown_initiated_: "
grpc_error_string(error), r->shutdown_initiated_); "%d",
r, grpc_error_string(error), r->shutdown_initiated_);
r->have_next_resolution_timer_ = false; r->have_next_resolution_timer_ = false;
if (error == GRPC_ERROR_NONE && !r->shutdown_initiated_) { if (error == GRPC_ERROR_NONE && !r->shutdown_initiated_) {
if (!r->resolving_) { if (!r->resolving_) {
GRPC_CARES_TRACE_LOG("%p start resolving due to re-resolution timer", r); GRPC_CARES_TRACE_LOG(
"resolver:%p start resolving due to re-resolution timer", r);
r->StartResolvingLocked(); r->StartResolvingLocked();
} }
} }
@ -327,8 +330,8 @@ void AresDnsResolver::OnResolvedLocked(void* arg, grpc_error* error) {
service_config_string = ChooseServiceConfig(r->service_config_json_); service_config_string = ChooseServiceConfig(r->service_config_json_);
gpr_free(r->service_config_json_); gpr_free(r->service_config_json_);
if (service_config_string != nullptr) { if (service_config_string != nullptr) {
gpr_log(GPR_INFO, "selected service config choice: %s", GRPC_CARES_TRACE_LOG("resolver:%p selected service config choice: %s",
service_config_string); r, service_config_string);
args_to_remove[num_args_to_remove++] = GRPC_ARG_SERVICE_CONFIG; args_to_remove[num_args_to_remove++] = GRPC_ARG_SERVICE_CONFIG;
args_to_add[num_args_to_add++] = grpc_channel_arg_string_create( args_to_add[num_args_to_add++] = grpc_channel_arg_string_create(
(char*)GRPC_ARG_SERVICE_CONFIG, service_config_string); (char*)GRPC_ARG_SERVICE_CONFIG, service_config_string);
@ -344,11 +347,11 @@ void AresDnsResolver::OnResolvedLocked(void* arg, grpc_error* error) {
r->backoff_.Reset(); r->backoff_.Reset();
} else if (!r->shutdown_initiated_) { } else if (!r->shutdown_initiated_) {
const char* msg = grpc_error_string(error); const char* msg = grpc_error_string(error);
gpr_log(GPR_DEBUG, "dns resolution failed: %s", msg); GRPC_CARES_TRACE_LOG("resolver:%p dns resolution failed: %s", r, msg);
grpc_millis next_try = r->backoff_.NextAttemptTime(); grpc_millis next_try = r->backoff_.NextAttemptTime();
grpc_millis timeout = next_try - ExecCtx::Get()->Now(); grpc_millis timeout = next_try - ExecCtx::Get()->Now();
gpr_log(GPR_INFO, "dns resolution failed (will retry): %s", GRPC_CARES_TRACE_LOG("resolver:%p dns resolution failed (will retry): %s",
grpc_error_string(error)); r, grpc_error_string(error));
GPR_ASSERT(!r->have_next_resolution_timer_); GPR_ASSERT(!r->have_next_resolution_timer_);
r->have_next_resolution_timer_ = true; r->have_next_resolution_timer_ = true;
// TODO(roth): We currently deal with this ref manually. Once the // TODO(roth): We currently deal with this ref manually. Once the
@ -357,9 +360,10 @@ void AresDnsResolver::OnResolvedLocked(void* arg, grpc_error* error) {
RefCountedPtr<Resolver> self = r->Ref(DEBUG_LOCATION, "retry-timer"); RefCountedPtr<Resolver> self = r->Ref(DEBUG_LOCATION, "retry-timer");
self.release(); self.release();
if (timeout > 0) { if (timeout > 0) {
gpr_log(GPR_DEBUG, "retrying in %" PRId64 " milliseconds", timeout); GRPC_CARES_TRACE_LOG("resolver:%p retrying in %" PRId64 " milliseconds",
r, timeout);
} else { } else {
gpr_log(GPR_DEBUG, "retrying immediately"); GRPC_CARES_TRACE_LOG("resolver:%p retrying immediately", r);
} }
grpc_timer_init(&r->next_resolution_timer_, next_try, grpc_timer_init(&r->next_resolution_timer_, next_try,
&r->on_next_resolution_); &r->on_next_resolution_);
@ -385,10 +389,10 @@ void AresDnsResolver::MaybeStartResolvingLocked() {
if (ms_until_next_resolution > 0) { if (ms_until_next_resolution > 0) {
const grpc_millis last_resolution_ago = const grpc_millis last_resolution_ago =
grpc_core::ExecCtx::Get()->Now() - last_resolution_timestamp_; grpc_core::ExecCtx::Get()->Now() - last_resolution_timestamp_;
gpr_log(GPR_DEBUG, GRPC_CARES_TRACE_LOG(
"In cooldown from last resolution (from %" PRId64 "resolver:%p In cooldown from last resolution (from %" PRId64
" ms ago). Will resolve again in %" PRId64 " ms", " ms ago). Will resolve again in %" PRId64 " ms",
last_resolution_ago, ms_until_next_resolution); this, last_resolution_ago, ms_until_next_resolution);
have_next_resolution_timer_ = true; have_next_resolution_timer_ = true;
// TODO(roth): We currently deal with this ref manually. Once the // TODO(roth): We currently deal with this ref manually. Once the
// new closure API is done, find a way to track this ref with the timer // new closure API is done, find a way to track this ref with the timer
@ -405,7 +409,6 @@ void AresDnsResolver::MaybeStartResolvingLocked() {
} }
void AresDnsResolver::StartResolvingLocked() { void AresDnsResolver::StartResolvingLocked() {
gpr_log(GPR_DEBUG, "Start resolving.");
// TODO(roth): We currently deal with this ref manually. Once the // TODO(roth): We currently deal with this ref manually. Once the
// new closure API is done, find a way to track this ref with the timer // new closure API is done, find a way to track this ref with the timer
// callback as part of the type system. // callback as part of the type system.
@ -420,6 +423,8 @@ void AresDnsResolver::StartResolvingLocked() {
request_service_config_ ? &service_config_json_ : nullptr, request_service_config_ ? &service_config_json_ : nullptr,
query_timeout_ms_, combiner()); query_timeout_ms_, combiner());
last_resolution_timestamp_ = grpc_core::ExecCtx::Get()->Now(); last_resolution_timestamp_ = grpc_core::ExecCtx::Get()->Now();
GRPC_CARES_TRACE_LOG("resolver:%p Started resolving. pending_request_:%p",
this, pending_request_);
} }
void AresDnsResolver::MaybeFinishNextLocked() { void AresDnsResolver::MaybeFinishNextLocked() {
@ -427,7 +432,8 @@ void AresDnsResolver::MaybeFinishNextLocked() {
*target_result_ = resolved_result_ == nullptr *target_result_ = resolved_result_ == nullptr
? nullptr ? nullptr
: grpc_channel_args_copy(resolved_result_); : grpc_channel_args_copy(resolved_result_);
gpr_log(GPR_DEBUG, "AresDnsResolver::MaybeFinishNextLocked()"); GRPC_CARES_TRACE_LOG("resolver:%p AresDnsResolver::MaybeFinishNextLocked()",
this);
GRPC_CLOSURE_SCHED(next_completion_, GRPC_ERROR_NONE); GRPC_CLOSURE_SCHED(next_completion_, GRPC_ERROR_NONE);
next_completion_ = nullptr; next_completion_ = nullptr;
published_version_ = resolved_version_; published_version_ = resolved_version_;

43
src/core/ext/filters/client_channel/resolver/dns/c_ares/grpc_ares_ev_driver.cc
Unescape View File

@ -90,15 +90,18 @@ static void grpc_ares_notify_on_event_locked(grpc_ares_ev_driver* ev_driver);
static grpc_ares_ev_driver* grpc_ares_ev_driver_ref( static grpc_ares_ev_driver* grpc_ares_ev_driver_ref(
grpc_ares_ev_driver* ev_driver) { grpc_ares_ev_driver* ev_driver) {
gpr_log(GPR_DEBUG, "Ref ev_driver %" PRIuPTR, (uintptr_t)ev_driver); GRPC_CARES_TRACE_LOG("request:%p Ref ev_driver %p", ev_driver->request,
ev_driver);
gpr_ref(&ev_driver->refs); gpr_ref(&ev_driver->refs);
return ev_driver; return ev_driver;
} }
static void grpc_ares_ev_driver_unref(grpc_ares_ev_driver* ev_driver) { static void grpc_ares_ev_driver_unref(grpc_ares_ev_driver* ev_driver) {
gpr_log(GPR_DEBUG, "Unref ev_driver %" PRIuPTR, (uintptr_t)ev_driver); GRPC_CARES_TRACE_LOG("request:%p Unref ev_driver %p", ev_driver->request,
ev_driver);
if (gpr_unref(&ev_driver->refs)) { if (gpr_unref(&ev_driver->refs)) {
gpr_log(GPR_DEBUG, "destroy ev_driver %" PRIuPTR, (uintptr_t)ev_driver); GRPC_CARES_TRACE_LOG("request:%p destroy ev_driver %p", ev_driver->request,
ev_driver);
GPR_ASSERT(ev_driver->fds == nullptr); GPR_ASSERT(ev_driver->fds == nullptr);
GRPC_COMBINER_UNREF(ev_driver->combiner, "free ares event driver"); GRPC_COMBINER_UNREF(ev_driver->combiner, "free ares event driver");
ares_destroy(ev_driver->channel); ares_destroy(ev_driver->channel);
@ -108,7 +111,8 @@ static void grpc_ares_ev_driver_unref(grpc_ares_ev_driver* ev_driver) {
} }
static void fd_node_destroy_locked(fd_node* fdn) { static void fd_node_destroy_locked(fd_node* fdn) {
gpr_log(GPR_DEBUG, "delete fd: %s", fdn->grpc_polled_fd->GetName()); GRPC_CARES_TRACE_LOG("request:%p delete fd: %s", fdn->ev_driver->request,
fdn->grpc_polled_fd->GetName());
GPR_ASSERT(!fdn->readable_registered); GPR_ASSERT(!fdn->readable_registered);
GPR_ASSERT(!fdn->writable_registered); GPR_ASSERT(!fdn->writable_registered);
GPR_ASSERT(fdn->already_shutdown); GPR_ASSERT(fdn->already_shutdown);
@ -136,7 +140,7 @@ grpc_error* grpc_ares_ev_driver_create_locked(grpc_ares_ev_driver** ev_driver,
memset(&opts, 0, sizeof(opts)); memset(&opts, 0, sizeof(opts));
opts.flags |= ARES_FLAG_STAYOPEN; opts.flags |= ARES_FLAG_STAYOPEN;
int status = ares_init_options(&(*ev_driver)->channel, &opts, ARES_OPT_FLAGS); int status = ares_init_options(&(*ev_driver)->channel, &opts, ARES_OPT_FLAGS);
gpr_log(GPR_DEBUG, "grpc_ares_ev_driver_create_locked"); GRPC_CARES_TRACE_LOG("request:%p grpc_ares_ev_driver_create_locked", request);
if (status != ARES_SUCCESS) { if (status != ARES_SUCCESS) {
char* err_msg; char* err_msg;
gpr_asprintf(&err_msg, "Failed to init ares channel. C-ares error: %s", gpr_asprintf(&err_msg, "Failed to init ares channel. C-ares error: %s",
@ -203,8 +207,9 @@ static fd_node* pop_fd_node_locked(fd_node** head, ares_socket_t as) {
static void on_timeout_locked(void* arg, grpc_error* error) { static void on_timeout_locked(void* arg, grpc_error* error) {
grpc_ares_ev_driver* driver = static_cast<grpc_ares_ev_driver*>(arg); grpc_ares_ev_driver* driver = static_cast<grpc_ares_ev_driver*>(arg);
GRPC_CARES_TRACE_LOG( GRPC_CARES_TRACE_LOG(
"ev_driver=%p on_timeout_locked. driver->shutting_down=%d. err=%s", "request:%p ev_driver=%p on_timeout_locked. driver->shutting_down=%d. "
driver, driver->shutting_down, grpc_error_string(error)); "err=%s",
driver->request, driver, driver->shutting_down, grpc_error_string(error));
if (!driver->shutting_down && error == GRPC_ERROR_NONE) { if (!driver->shutting_down && error == GRPC_ERROR_NONE) {
grpc_ares_ev_driver_shutdown_locked(driver); grpc_ares_ev_driver_shutdown_locked(driver);
} }
@ -216,7 +221,8 @@ static void on_readable_locked(void* arg, grpc_error* error) {
grpc_ares_ev_driver* ev_driver = fdn->ev_driver; grpc_ares_ev_driver* ev_driver = fdn->ev_driver;
const ares_socket_t as = fdn->grpc_polled_fd->GetWrappedAresSocketLocked(); const ares_socket_t as = fdn->grpc_polled_fd->GetWrappedAresSocketLocked();
fdn->readable_registered = false; fdn->readable_registered = false;
gpr_log(GPR_DEBUG, "readable on %s", fdn->grpc_polled_fd->GetName()); GRPC_CARES_TRACE_LOG("request:%p readable on %s", fdn->ev_driver->request,
fdn->grpc_polled_fd->GetName());
if (error == GRPC_ERROR_NONE) { if (error == GRPC_ERROR_NONE) {
do { do {
ares_process_fd(ev_driver->channel, as, ARES_SOCKET_BAD); ares_process_fd(ev_driver->channel, as, ARES_SOCKET_BAD);
@ -239,7 +245,8 @@ static void on_writable_locked(void* arg, grpc_error* error) {
grpc_ares_ev_driver* ev_driver = fdn->ev_driver; grpc_ares_ev_driver* ev_driver = fdn->ev_driver;
const ares_socket_t as = fdn->grpc_polled_fd->GetWrappedAresSocketLocked(); const ares_socket_t as = fdn->grpc_polled_fd->GetWrappedAresSocketLocked();
fdn->writable_registered = false; fdn->writable_registered = false;
gpr_log(GPR_DEBUG, "writable on %s", fdn->grpc_polled_fd->GetName()); GRPC_CARES_TRACE_LOG("request:%p writable on %s", ev_driver->request,
fdn->grpc_polled_fd->GetName());
if (error == GRPC_ERROR_NONE) { if (error == GRPC_ERROR_NONE) {
ares_process_fd(ev_driver->channel, ARES_SOCKET_BAD, as); ares_process_fd(ev_driver->channel, ARES_SOCKET_BAD, as);
} else { } else {
@ -278,7 +285,8 @@ static void grpc_ares_notify_on_event_locked(grpc_ares_ev_driver* ev_driver) {
fdn->grpc_polled_fd = fdn->grpc_polled_fd =
ev_driver->polled_fd_factory->NewGrpcPolledFdLocked( ev_driver->polled_fd_factory->NewGrpcPolledFdLocked(
socks[i], ev_driver->pollset_set, ev_driver->combiner); socks[i], ev_driver->pollset_set, ev_driver->combiner);
gpr_log(GPR_DEBUG, "new fd: %s", fdn->grpc_polled_fd->GetName()); GRPC_CARES_TRACE_LOG("request:%p new fd: %s", ev_driver->request,
fdn->grpc_polled_fd->GetName());
fdn->ev_driver = ev_driver; fdn->ev_driver = ev_driver;
fdn->readable_registered = false; fdn->readable_registered = false;
fdn->writable_registered = false; fdn->writable_registered = false;
@ -295,7 +303,8 @@ static void grpc_ares_notify_on_event_locked(grpc_ares_ev_driver* ev_driver) {
if (ARES_GETSOCK_READABLE(socks_bitmask, i) && if (ARES_GETSOCK_READABLE(socks_bitmask, i) &&
!fdn->readable_registered) { !fdn->readable_registered) {
grpc_ares_ev_driver_ref(ev_driver); grpc_ares_ev_driver_ref(ev_driver);
gpr_log(GPR_DEBUG, "notify read on: %s", GRPC_CARES_TRACE_LOG("request:%p notify read on: %s",
ev_driver->request,
fdn->grpc_polled_fd->GetName()); fdn->grpc_polled_fd->GetName());
fdn->grpc_polled_fd->RegisterForOnReadableLocked(&fdn->read_closure); fdn->grpc_polled_fd->RegisterForOnReadableLocked(&fdn->read_closure);
fdn->readable_registered = true; fdn->readable_registered = true;
@ -304,7 +313,8 @@ static void grpc_ares_notify_on_event_locked(grpc_ares_ev_driver* ev_driver) {
// has not been registered with this socket. // has not been registered with this socket.
if (ARES_GETSOCK_WRITABLE(socks_bitmask, i) && if (ARES_GETSOCK_WRITABLE(socks_bitmask, i) &&
!fdn->writable_registered) { !fdn->writable_registered) {
gpr_log(GPR_DEBUG, "notify write on: %s", GRPC_CARES_TRACE_LOG("request:%p notify write on: %s",
ev_driver->request,
fdn->grpc_polled_fd->GetName()); fdn->grpc_polled_fd->GetName());
grpc_ares_ev_driver_ref(ev_driver); grpc_ares_ev_driver_ref(ev_driver);
fdn->grpc_polled_fd->RegisterForOnWriteableLocked( fdn->grpc_polled_fd->RegisterForOnWriteableLocked(
@ -332,7 +342,8 @@ static void grpc_ares_notify_on_event_locked(grpc_ares_ev_driver* ev_driver) {
// If the ev driver has no working fd, all the tasks are done. // If the ev driver has no working fd, all the tasks are done.
if (new_list == nullptr) { if (new_list == nullptr) {
ev_driver->working = false; ev_driver->working = false;
gpr_log(GPR_DEBUG, "ev driver stop working"); GRPC_CARES_TRACE_LOG("request:%p ev driver stop working",
ev_driver->request);
} }
} }
@ -345,9 +356,9 @@ void grpc_ares_ev_driver_start_locked(grpc_ares_ev_driver* ev_driver) {
? GRPC_MILLIS_INF_FUTURE ? GRPC_MILLIS_INF_FUTURE
: ev_driver->query_timeout_ms + grpc_core::ExecCtx::Get()->Now(); : ev_driver->query_timeout_ms + grpc_core::ExecCtx::Get()->Now();
GRPC_CARES_TRACE_LOG( GRPC_CARES_TRACE_LOG(
"ev_driver=%p grpc_ares_ev_driver_start_locked. timeout in %" PRId64 "request:%p ev_driver=%p grpc_ares_ev_driver_start_locked. timeout in "
" ms", "%" PRId64 " ms",
ev_driver, timeout); ev_driver->request, ev_driver, timeout);
grpc_ares_ev_driver_ref(ev_driver); grpc_ares_ev_driver_ref(ev_driver);
grpc_timer_init(&ev_driver->query_timeout, timeout, grpc_timer_init(&ev_driver->query_timeout, timeout,
&ev_driver->on_timeout_locked); &ev_driver->on_timeout_locked);

39
src/core/ext/filters/client_channel/resolver/dns/c_ares/grpc_ares_wrapper.cc
Unescape View File

@ -96,11 +96,11 @@ static void log_address_sorting_list(const ServerAddressList& addresses,
for (size_t i = 0; i < addresses.size(); i++) { for (size_t i = 0; i < addresses.size(); i++) {
char* addr_str; char* addr_str;
if (grpc_sockaddr_to_string(&addr_str, &addresses[i].address(), true)) { if (grpc_sockaddr_to_string(&addr_str, &addresses[i].address(), true)) {
gpr_log(GPR_DEBUG, "c-ares address sorting: %s[%" PRIuPTR "]=%s", gpr_log(GPR_INFO, "c-ares address sorting: %s[%" PRIuPTR "]=%s",
input_output_str, i, addr_str); input_output_str, i, addr_str);
gpr_free(addr_str); gpr_free(addr_str);
} else { } else {
gpr_log(GPR_DEBUG, gpr_log(GPR_INFO,
"c-ares address sorting: %s[%" PRIuPTR "]=<unprintable>", "c-ares address sorting: %s[%" PRIuPTR "]=<unprintable>",
input_output_str, i); input_output_str, i);
} }
@ -209,10 +209,10 @@ static void on_hostbyname_done_locked(void* arg, int status, int timeouts,
addresses.emplace_back(&addr, addr_len, args); addresses.emplace_back(&addr, addr_len, args);
char output[INET6_ADDRSTRLEN]; char output[INET6_ADDRSTRLEN];
ares_inet_ntop(AF_INET6, &addr.sin6_addr, output, INET6_ADDRSTRLEN); ares_inet_ntop(AF_INET6, &addr.sin6_addr, output, INET6_ADDRSTRLEN);
gpr_log(GPR_DEBUG, GRPC_CARES_TRACE_LOG(
"c-ares resolver gets a AF_INET6 result: \n" "request:%p c-ares resolver gets a AF_INET6 result: \n"
" addr: %s\n port: %d\n sin6_scope_id: %d\n", " addr: %s\n port: %d\n sin6_scope_id: %d\n",
output, ntohs(hr->port), addr.sin6_scope_id); r, output, ntohs(hr->port), addr.sin6_scope_id);
break; break;
} }
case AF_INET: { case AF_INET: {
@ -226,10 +226,10 @@ static void on_hostbyname_done_locked(void* arg, int status, int timeouts,
addresses.emplace_back(&addr, addr_len, args); addresses.emplace_back(&addr, addr_len, args);
char output[INET_ADDRSTRLEN]; char output[INET_ADDRSTRLEN];
ares_inet_ntop(AF_INET, &addr.sin_addr, output, INET_ADDRSTRLEN); ares_inet_ntop(AF_INET, &addr.sin_addr, output, INET_ADDRSTRLEN);
gpr_log(GPR_DEBUG, GRPC_CARES_TRACE_LOG(
"c-ares resolver gets a AF_INET result: \n" "request:%p c-ares resolver gets a AF_INET result: \n"
" addr: %s\n port: %d\n", " addr: %s\n port: %d\n",
output, ntohs(hr->port)); r, output, ntohs(hr->port));
break; break;
} }
} }
@ -252,9 +252,9 @@ static void on_hostbyname_done_locked(void* arg, int status, int timeouts,
static void on_srv_query_done_locked(void* arg, int status, int timeouts, static void on_srv_query_done_locked(void* arg, int status, int timeouts,
unsigned char* abuf, int alen) { unsigned char* abuf, int alen) {
grpc_ares_request* r = static_cast<grpc_ares_request*>(arg); grpc_ares_request* r = static_cast<grpc_ares_request*>(arg);
gpr_log(GPR_DEBUG, "on_query_srv_done_locked"); GRPC_CARES_TRACE_LOG("request:%p on_query_srv_done_locked", r);
if (status == ARES_SUCCESS) { if (status == ARES_SUCCESS) {
gpr_log(GPR_DEBUG, "on_query_srv_done_locked ARES_SUCCESS"); GRPC_CARES_TRACE_LOG("request:%p on_query_srv_done_locked ARES_SUCCESS", r);
struct ares_srv_reply* reply; struct ares_srv_reply* reply;
const int parse_status = ares_parse_srv_reply(abuf, alen, &reply); const int parse_status = ares_parse_srv_reply(abuf, alen, &reply);
if (parse_status == ARES_SUCCESS) { if (parse_status == ARES_SUCCESS) {
@ -297,9 +297,9 @@ static const char g_service_config_attribute_prefix[] = "grpc_config=";
static void on_txt_done_locked(void* arg, int status, int timeouts, static void on_txt_done_locked(void* arg, int status, int timeouts,
unsigned char* buf, int len) { unsigned char* buf, int len) {
gpr_log(GPR_DEBUG, "on_txt_done_locked");
char* error_msg; char* error_msg;
grpc_ares_request* r = static_cast<grpc_ares_request*>(arg); grpc_ares_request* r = static_cast<grpc_ares_request*>(arg);
GRPC_CARES_TRACE_LOG("request:%p on_txt_done_locked", r);
const size_t prefix_len = sizeof(g_service_config_attribute_prefix) - 1; const size_t prefix_len = sizeof(g_service_config_attribute_prefix) - 1;
struct ares_txt_ext* result = nullptr; struct ares_txt_ext* result = nullptr;
struct ares_txt_ext* reply = nullptr; struct ares_txt_ext* reply = nullptr;
@ -332,7 +332,8 @@ static void on_txt_done_locked(void* arg, int status, int timeouts,
service_config_len += result->length; service_config_len += result->length;
} }
(*r->service_config_json_out)[service_config_len] = '\0'; (*r->service_config_json_out)[service_config_len] = '\0';
gpr_log(GPR_INFO, "found service config: %s", *r->service_config_json_out); GRPC_CARES_TRACE_LOG("request:%p found service config: %s", r,
*r->service_config_json_out);
} }
// Clean up. // Clean up.
ares_free_data(reply); ares_free_data(reply);
@ -358,12 +359,6 @@ void grpc_dns_lookup_ares_continue_after_check_localhost_and_ip_literals_locked(
grpc_error* error = GRPC_ERROR_NONE; grpc_error* error = GRPC_ERROR_NONE;
grpc_ares_hostbyname_request* hr = nullptr; grpc_ares_hostbyname_request* hr = nullptr;
ares_channel* channel = nullptr; ares_channel* channel = nullptr;
/* TODO(zyc): Enable tracing after #9603 is checked in */
/* if (grpc_dns_trace) {
gpr_log(GPR_DEBUG, "resolve_address (blocking): name=%s, default_port=%s",
name, default_port);
} */
/* parse name, splitting it into host and port parts */ /* parse name, splitting it into host and port parts */
char* host; char* host;
char* port; char* port;
@ -388,7 +383,7 @@ void grpc_dns_lookup_ares_continue_after_check_localhost_and_ip_literals_locked(
channel = grpc_ares_ev_driver_get_channel_locked(r->ev_driver); channel = grpc_ares_ev_driver_get_channel_locked(r->ev_driver);
// If dns_server is specified, use it. // If dns_server is specified, use it.
if (dns_server != nullptr) { if (dns_server != nullptr) {
gpr_log(GPR_INFO, "Using DNS server %s", dns_server); GRPC_CARES_TRACE_LOG("request:%p Using DNS server %s", r, dns_server);
grpc_resolved_address addr; grpc_resolved_address addr;
if (grpc_parse_ipv4_hostport(dns_server, &addr, false /* log_errors */)) { if (grpc_parse_ipv4_hostport(dns_server, &addr, false /* log_errors */)) {
r->dns_server_addr.family = AF_INET; r->dns_server_addr.family = AF_INET;
@ -513,7 +508,7 @@ static bool resolve_as_ip_literal_locked(
static bool target_matches_localhost_inner(const char* name, char** host, static bool target_matches_localhost_inner(const char* name, char** host,
char** port) { char** port) {
if (!gpr_split_host_port(name, host, port)) { if (!gpr_split_host_port(name, host, port)) {
gpr_log(GPR_INFO, "Unable to split host and port for name: %s", name); gpr_log(GPR_ERROR, "Unable to split host and port for name: %s", name);
return false; return false;
} }
if (gpr_stricmp(*host, "localhost") == 0) { if (gpr_stricmp(*host, "localhost") == 0) {
@ -547,6 +542,10 @@ static grpc_ares_request* grpc_dns_lookup_ares_locked_impl(
r->success = false; r->success = false;
r->error = GRPC_ERROR_NONE; r->error = GRPC_ERROR_NONE;
r->pending_queries = 0; r->pending_queries = 0;
GRPC_CARES_TRACE_LOG(
"request:%p c-ares grpc_dns_lookup_ares_locked_impl name=%s, "
"default_port=%s",
r, name, default_port);
// Early out if the target is an ipv4 or ipv6 literal. // Early out if the target is an ipv4 or ipv6 literal.
if (resolve_as_ip_literal_locked(name, default_port, addrs)) { if (resolve_as_ip_literal_locked(name, default_port, addrs)) {
GRPC_CLOSURE_SCHED(on_done, GRPC_ERROR_NONE); GRPC_CLOSURE_SCHED(on_done, GRPC_ERROR_NONE);

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