[Gpr_To_Absl_Logging] Migrating from gpr to absl logging - gpr_log (#37148)

[Gpr_To_Absl_Logging] Migrating from gpr to absl logging - gpr_log
In this CL we are migrating from gRPCs own gpr logging mechanism to absl logging mechanism. The intention is to deprecate gpr_log in the future.

We have the following mapping

1. gpr_log(GPR_INFO,...) -> LOG(INFO)
2. gpr_log(GPR_ERROR,...) -> LOG(ERROR)
3. gpr_log(GPR_DEBUG,...) -> VLOG(2)

Reviewers need to check :

1. If the above mapping is correct.
2. The content of the log is as before.
gpr_log format strings did not use string_view or std::string . absl LOG accepts these. So there will be some elimination of string_view and std::string related conversions. This is expected.

Closes #37148

COPYBARA_INTEGRATE_REVIEW=https://github.com/grpc/grpc/pull/37148 from tanvi-jagtap:src_core_lib_grpp_time 525cf70e24
PiperOrigin-RevId: 650460526

src/core/BUILD

@@ -1910,6 +1910,7 @@ grpc_cc_library(
     ],
     hdrs = ["lib/event_engine/thread_pool/thread_count.h"],
     external_deps = [
+        "absl/log:log",
         "absl/base:core_headers",
         "absl/time",
         "absl/status",
@@ -2280,7 +2281,7 @@ grpc_cc_library(
         "absl/container:flat_hash_map",
         "absl/functional:any_invocable",
         "absl/hash",
-        "absl/log",
+        "absl/log:log",
         "absl/log:check",
         "absl/status",
         "absl/status:statusor",

src/core/lib/event_engine/posix_engine/posix_endpoint.cc

@@ -970,15 +970,15 @@ bool PosixEndpointImpl::DoFlushZerocopy(TcpZerocopySendRecord* record,
         handle_->SetWritable();
       } else {
 #ifdef GRPC_LINUX_ERRQUEUE
-        GRPC_LOG_EVERY_N_SEC(
-            1, GPR_INFO,
-            "Tx0cp encountered an ENOBUFS error possibly because one or "
-            "both of RLIMIT_MEMLOCK or hard memlock ulimit values are too "
-            "small for the intended user. Current system value of "
-            "RLIMIT_MEMLOCK is %" PRIu64 " and hard memlock ulimit is %" PRIu64
-            ".Consider increasing these values appropriately for the intended "
-            "user.",
-            GetRLimitMemLockMax(), GetUlimitHardMemLock());
+        LOG_EVERY_N_SEC(INFO, 1)
+            << "Tx0cp encountered an ENOBUFS error possibly because one or "
+               "both of RLIMIT_MEMLOCK or hard memlock ulimit values are too "
+               "small for the intended user. Current system value of "
+               "RLIMIT_MEMLOCK is "
+            << GetRLimitMemLockMax() << " and hard memlock ulimit is "
+            << GetUlimitHardMemLock()
+            << ".Consider increasing these values appropriately for the "
+               "intended user.";
 #endif
       }
     }

src/core/lib/event_engine/posix_engine/tcp_socket_utils.cc

@@ -106,14 +106,15 @@ int CreateSocket(std::function<int(int, int, int)> socket_factory, int family,
                                       : socket(family, type, protocol);
   if (res < 0 && errno == EMFILE) {
     int saved_errno = errno;
-    GRPC_LOG_EVERY_N_SEC(
-        10, GPR_ERROR,
-        "socket(%d, %d, %d) returned %d with error: |%s|. This process "
-        "might not have a sufficient file descriptor limit for the number "
-        "of connections grpc wants to open (which is generally a function of "
-        "the number of grpc channels, the lb policy of each channel, and the "
-        "number of backends each channel is load balancing across).",
-        family, type, protocol, res, grpc_core::StrError(errno).c_str());
+    LOG_EVERY_N_SEC(ERROR, 10)
+        << "socket(" << family << ", " << type << ", " << protocol
+        << ") returned " << res << " with error: |"
+        << grpc_core::StrError(errno)
+        << "|. This process might not have a sufficient file descriptor limit "
+           "for the number of connections grpc wants to open (which is "
+           "generally a function of the number of grpc channels, the lb policy "
+           "of each channel, and the number of backends each channel is load "
+           "balancing across).";
     errno = saved_errno;
   }
   return res;

src/core/lib/event_engine/thread_pool/thread_count.cc

@@ -17,6 +17,7 @@
 
 #include <cstddef>
 
+#include "absl/log/log.h"
 #include "absl/status/status.h"
 #include "absl/strings/str_format.h"
 #include "absl/time/clock.h"
@@ -52,8 +53,8 @@ absl::Status LivingThreadCount::BlockUntilThreadCount(
       prev_thread_count = curr_threads;
       timeout_baseline = grpc_core::Timestamp::Now();
     }
-    GRPC_LOG_EVERY_N_SEC_DELAYED(
-        log_rate.seconds(), GPR_DEBUG,
+    GRPC_LOG_EVERY_N_SEC_DELAYED_DEBUG(
+        log_rate.seconds(),
         "Waiting for thread pool to idle before %s. (%" PRIdPTR " to %" PRIdPTR
         "). Timing out in %0.f seconds.",
         why, curr_threads, desired_threads,

src/core/lib/event_engine/thread_pool/work_stealing_thread_pool.cc

@@ -412,9 +412,9 @@ void WorkStealingThreadPool::WorkStealingThreadPoolImpl::Lifeguard::
 WorkStealingThreadPool::WorkStealingThreadPoolImpl::Lifeguard::~Lifeguard() {
   lifeguard_should_shut_down_->Notify();
   while (lifeguard_running_.load(std::memory_order_relaxed)) {
-    GRPC_LOG_EVERY_N_SEC_DELAYED(kBlockingQuiesceLogRateSeconds, GPR_DEBUG,
-                                 "%s",
-                                 "Waiting for lifeguard thread to shut down");
+    GRPC_LOG_EVERY_N_SEC_DELAYED_DEBUG(
+        kBlockingQuiesceLogRateSeconds, "%s",
+        "Waiting for lifeguard thread to shut down");
     lifeguard_is_shut_down_->WaitForNotification();
   }
   // Do an additional wait in case this method races with LifeguardMain's

src/core/lib/event_engine/windows/windows_engine.cc

@@ -228,8 +228,8 @@ WindowsEventEngine::~WindowsEventEngine() {
           timer_manager_.Now() + grpc_core::Duration::FromSecondsAsDouble(10);
       while (!known_handles_.empty() && timer_manager_.Now() < deadline) {
         if (GRPC_TRACE_FLAG_ENABLED(event_engine)) {
-          GRPC_LOG_EVERY_N_SEC(1, GPR_DEBUG, "Waiting for timers. %d remaining",
-                               known_handles_.size());
+          VLOG_EVERY_N_SEC(2, 1) << "Waiting for timers. "
+                                 << known_handles_.size() << " remaining";
         }
         task_mu_.Unlock();
         absl::SleepFor(absl::Milliseconds(200));

src/core/lib/gprpp/time.h

@@ -31,19 +31,7 @@
 #include "src/core/util/time_precise.h"
 #include "src/core/util/useful.h"
 
-#define GRPC_LOG_EVERY_N_SEC(n, severity, format, ...)          \
-  do {                                                          \
-    static std::atomic<uint64_t> prev{0};                       \
-    uint64_t now = grpc_core::Timestamp::FromTimespecRoundDown( \
-                       gpr_now(GPR_CLOCK_MONOTONIC))            \
-                       .milliseconds_after_process_epoch();     \
-    if (prev == 0 || now - prev > (n) * 1000) {                 \
-      prev = now;                                               \
-      gpr_log(severity, format, __VA_ARGS__);                   \
-    }                                                           \
-  } while (0)
-
-#define GRPC_LOG_EVERY_N_SEC_DELAYED(n, severity, format, ...)  \
+#define GRPC_LOG_EVERY_N_SEC_DELAYED_DEBUG(n, format, ...)      \
   do {                                                          \
     static std::atomic<uint64_t> prev{0};                       \
     uint64_t now = grpc_core::Timestamp::FromTimespecRoundDown( \
@@ -52,7 +40,7 @@
     if (prev == 0) prev = now;                                  \
     if (now - prev > (n) * 1000) {                              \
       prev = now;                                               \
-      gpr_log(severity, format, __VA_ARGS__);                   \
+      VLOG(2) << absl::StrFormat(format, __VA_ARGS__);          \
     }                                                           \
   } while (0)
 

src/core/lib/iomgr/socket_utils_common_posix.cc

@@ -477,14 +477,15 @@ static int create_socket(grpc_socket_factory* factory, int domain, int type,
                 : socket(domain, type, protocol);
   if (res < 0 && errno == EMFILE) {
     int saved_errno = errno;
-    GRPC_LOG_EVERY_N_SEC(
-        10, GPR_ERROR,
-        "socket(%d, %d, %d) returned %d with error: |%s|. This process "
-        "might not have a sufficient file descriptor limit for the number "
-        "of connections grpc wants to open (which is generally a function of "
-        "the number of grpc channels, the lb policy of each channel, and the "
-        "number of backends each channel is load balancing across).",
-        domain, type, protocol, res, grpc_core::StrError(errno).c_str());
+    LOG_EVERY_N_SEC(ERROR, 10)
+        << "socket(" << domain << ", " << type << ", " << protocol
+        << ") returned " << res << " with error: |"
+        << grpc_core::StrError(errno)
+        << "|. This process might not have a sufficient file descriptor limit "
+           "for the number of connections grpc wants to open (which is "
+           "generally a function of the number of grpc channels, the lb policy "
+           "of each channel, and the number of backends each channel is load "
+           "balancing across).";
     errno = saved_errno;
   }
   return res;

src/core/lib/iomgr/tcp_posix.cc

@@ -592,9 +592,9 @@ void LogCommonIOErrors(absl::string_view prefix, int error_no) {
       return;
     default:
       grpc_core::global_stats().IncrementUncommonIoErrorCount();
-      GRPC_LOG_EVERY_N_SEC(1, GPR_ERROR, "%s encountered uncommon error: %s",
-                           prefix.data(),
-                           grpc_core::StrError(error_no).c_str());
+      LOG_EVERY_N_SEC(ERROR, 1)
+          << prefix.data()
+          << " encountered uncommon error: " << grpc_core::StrError(error_no);
       return;
   }
 }

src/core/lib/iomgr/tcp_server_posix.cc

@@ -394,8 +394,7 @@ static void on_read(void* arg, grpc_error_handle err) {
       // This is not a performant code path, but if an fd limit has been
       // reached, the system is likely in an unhappy state regardless.
       if (errno == EMFILE) {
-        GRPC_LOG_EVERY_N_SEC(1, GPR_ERROR, "%s",
-                             "File descriptor limit reached. Retrying.");
+        LOG_EVERY_N_SEC(ERROR, 1) << "File descriptor limit reached. Retrying.";
         grpc_fd_notify_on_read(sp->emfd, &sp->read_closure);
         if (gpr_atm_full_xchg(&sp->retry_timer_armed, true)) return;
         grpc_timer_init(&sp->retry_timer,

test/core/event_engine/event_engine_test_utils.cc

@@ -97,10 +97,10 @@ void WaitForSingleOwnerWithTimeout(std::shared_ptr<EventEngine> engine,
     if (remaining < std::chrono::seconds{0}) {
       grpc_core::Crash("Timed out waiting for a single EventEngine owner");
     }
-    GRPC_LOG_EVERY_N_SEC(
-        2, GPR_INFO, "engine.use_count() = %ld timeout_remaining = %s",
-        engine.use_count(),
-        absl::FormatDuration(absl::Nanoseconds(remaining.count())).c_str());
+    LOG_EVERY_N_SEC(INFO, 2)
+        << "engine.use_count() = " << engine.use_count()
+        << " timeout_remaining = "
+        << absl::FormatDuration(absl::Nanoseconds(remaining.count()));
     absl::SleepFor(absl::Milliseconds(100));
   }
 }