[fix] Make GRPC_VERBOSITY=debug work with abseil logging (#36501)

Closes #36501

COPYBARA_INTEGRATE_REVIEW=https://github.com/grpc/grpc/pull/36501 from drfloob:make-debug-logging-work-again b5f81e4c39
PiperOrigin-RevId: 630132023

BUILD

@@ -783,6 +783,7 @@ grpc_cc_library(
         "absl/base:log_severity",
         "absl/functional:any_invocable",
         "absl/log",
+        "absl/log:globals",
         "absl/memory",
         "absl/random",
         "absl/status",

CMakeLists.txt

@@ -1749,6 +1749,7 @@ target_link_libraries(gpr
   absl::flags_marshalling
   absl::any_invocable
   absl::check
+  absl::log_globals
   absl::log
   absl::memory
   absl::random_random
@@ -36925,7 +36926,7 @@ generate_pkgconfig(
   "gpr"
   "gRPC platform support library"
   "${gRPC_CORE_VERSION}"
-  "absl_any_invocable absl_base absl_check absl_cord absl_core_headers absl_flags absl_flags_marshalling absl_log absl_log_severity absl_memory absl_optional absl_random_random absl_status absl_str_format absl_strings absl_synchronization absl_time absl_variant"
+  "absl_any_invocable absl_base absl_check absl_cord absl_core_headers absl_flags absl_flags_marshalling absl_log absl_log_globals absl_log_severity absl_memory absl_optional absl_random_random absl_status absl_str_format absl_strings absl_synchronization absl_time absl_variant"
   ""
   "-lgpr"
   ""
@@ -36936,7 +36937,7 @@ generate_pkgconfig(
   "gRPC"
   "high performance general RPC framework"
   "${gRPC_CORE_VERSION}"
-  "absl_algorithm_container absl_any_invocable absl_base absl_bind_front absl_check absl_cleanup absl_config absl_cord absl_core_headers absl_flags absl_flags_marshalling absl_flat_hash_map absl_flat_hash_set absl_function_ref absl_hash absl_inlined_vector absl_log absl_log_severity absl_memory absl_no_destructor absl_optional absl_random_bit_gen_ref absl_random_distributions absl_random_random absl_span absl_status absl_statusor absl_str_format absl_strings absl_synchronization absl_time absl_type_traits absl_utility absl_variant gpr"
+  "absl_algorithm_container absl_any_invocable absl_base absl_bind_front absl_check absl_cleanup absl_config absl_cord absl_core_headers absl_flags absl_flags_marshalling absl_flat_hash_map absl_flat_hash_set absl_function_ref absl_hash absl_inlined_vector absl_log absl_log_globals absl_log_severity absl_memory absl_no_destructor absl_optional absl_random_bit_gen_ref absl_random_distributions absl_random_random absl_span absl_status absl_statusor absl_str_format absl_strings absl_synchronization absl_time absl_type_traits absl_utility absl_variant gpr"
   "libcares openssl re2 zlib"
   "-lgrpc"
   "-laddress_sorting -lupb_textformat_lib -lupb_json_lib -lupb_message_lib -lupb_mem_lib -lupb_base_lib -lutf8_range_lib"
@@ -36947,7 +36948,7 @@ generate_pkgconfig(
   "gRPC unsecure"
   "high performance general RPC framework without SSL"
   "${gRPC_CORE_VERSION}"
-  "absl_algorithm_container absl_any_invocable absl_base absl_bind_front absl_check absl_cleanup absl_config absl_cord absl_core_headers absl_flags absl_flags_marshalling absl_flat_hash_map absl_flat_hash_set absl_function_ref absl_hash absl_inlined_vector absl_log absl_log_severity absl_memory absl_no_destructor absl_optional absl_random_bit_gen_ref absl_random_distributions absl_random_random absl_span absl_status absl_statusor absl_str_format absl_strings absl_synchronization absl_time absl_type_traits absl_utility absl_variant gpr"
+  "absl_algorithm_container absl_any_invocable absl_base absl_bind_front absl_check absl_cleanup absl_config absl_cord absl_core_headers absl_flags absl_flags_marshalling absl_flat_hash_map absl_flat_hash_set absl_function_ref absl_hash absl_inlined_vector absl_log absl_log_globals absl_log_severity absl_memory absl_no_destructor absl_optional absl_random_bit_gen_ref absl_random_distributions absl_random_random absl_span absl_status absl_statusor absl_str_format absl_strings absl_synchronization absl_time absl_type_traits absl_utility absl_variant gpr"
   "libcares zlib"
   "-lgrpc_unsecure"
   "-laddress_sorting -lupb_message_lib -lupb_mem_lib -lupb_base_lib -lutf8_range_lib"
@@ -36958,7 +36959,7 @@ generate_pkgconfig(
   "gRPC++"
   "C++ wrapper for gRPC"
   "${gRPC_CPP_VERSION}"
-  "absl_algorithm_container absl_any_invocable absl_base absl_bind_front absl_check absl_cleanup absl_config absl_cord absl_core_headers absl_flags absl_flags_marshalling absl_flat_hash_map absl_flat_hash_set absl_function_ref absl_hash absl_inlined_vector absl_log absl_log_severity absl_memory absl_no_destructor absl_optional absl_random_bit_gen_ref absl_random_distributions absl_random_random absl_span absl_status absl_statusor absl_str_format absl_strings absl_synchronization absl_time absl_type_traits absl_utility absl_variant gpr grpc"
+  "absl_algorithm_container absl_any_invocable absl_base absl_bind_front absl_check absl_cleanup absl_config absl_cord absl_core_headers absl_flags absl_flags_marshalling absl_flat_hash_map absl_flat_hash_set absl_function_ref absl_hash absl_inlined_vector absl_log absl_log_globals absl_log_severity absl_memory absl_no_destructor absl_optional absl_random_bit_gen_ref absl_random_distributions absl_random_random absl_span absl_status absl_statusor absl_str_format absl_strings absl_synchronization absl_time absl_type_traits absl_utility absl_variant gpr grpc"
   "libcares openssl re2 zlib"
   "-lgrpc++"
   "-laddress_sorting -lupb_textformat_lib -lupb_json_lib -lupb_message_lib -lupb_mem_lib -lupb_base_lib -lutf8_range_lib"
@@ -36969,7 +36970,7 @@ generate_pkgconfig(
   "gRPC++ unsecure"
   "C++ wrapper for gRPC without SSL"
   "${gRPC_CPP_VERSION}"
-  "absl_algorithm_container absl_any_invocable absl_base absl_bind_front absl_check absl_cleanup absl_config absl_cord absl_core_headers absl_flags absl_flags_marshalling absl_flat_hash_map absl_flat_hash_set absl_function_ref absl_hash absl_inlined_vector absl_log absl_log_severity absl_memory absl_no_destructor absl_optional absl_random_bit_gen_ref absl_random_distributions absl_random_random absl_span absl_status absl_statusor absl_str_format absl_strings absl_synchronization absl_time absl_type_traits absl_utility absl_variant gpr grpc_unsecure"
+  "absl_algorithm_container absl_any_invocable absl_base absl_bind_front absl_check absl_cleanup absl_config absl_cord absl_core_headers absl_flags absl_flags_marshalling absl_flat_hash_map absl_flat_hash_set absl_function_ref absl_hash absl_inlined_vector absl_log absl_log_globals absl_log_severity absl_memory absl_no_destructor absl_optional absl_random_bit_gen_ref absl_random_distributions absl_random_random absl_span absl_status absl_statusor absl_str_format absl_strings absl_synchronization absl_time absl_type_traits absl_utility absl_variant gpr grpc_unsecure"
   "libcares zlib"
   "-lgrpc++_unsecure"
   "-laddress_sorting -lupb_message_lib -lupb_mem_lib -lupb_base_lib -lutf8_range_lib"

build_autogenerated.yaml

@@ -130,6 +130,7 @@ libs:
   - absl/flags:marshalling
   - absl/functional:any_invocable
   - absl/log:check
+  - absl/log:globals
   - absl/log:log
   - absl/memory:memory
   - absl/random:random

gRPC-C++.podspec

@@ -244,6 +244,7 @@ Pod::Spec.new do |s|
     ss.dependency 'abseil/functional/function_ref', abseil_version
     ss.dependency 'abseil/hash/hash', abseil_version
     ss.dependency 'abseil/log/check', abseil_version
+    ss.dependency 'abseil/log/globals', abseil_version
     ss.dependency 'abseil/log/log', abseil_version
     ss.dependency 'abseil/memory/memory', abseil_version
     ss.dependency 'abseil/meta/type_traits', abseil_version

gRPC-Core.podspec

@@ -216,6 +216,7 @@ Pod::Spec.new do |s|
     ss.dependency 'abseil/functional/function_ref', abseil_version
     ss.dependency 'abseil/hash/hash', abseil_version
     ss.dependency 'abseil/log/check', abseil_version
+    ss.dependency 'abseil/log/globals', abseil_version
     ss.dependency 'abseil/log/log', abseil_version
     ss.dependency 'abseil/memory/memory', abseil_version
     ss.dependency 'abseil/meta/type_traits', abseil_version

src/core/lib/gpr/log.cc

@@ -23,6 +23,7 @@
 #include <stdio.h>
 #include <string.h>
 
+#include "absl/log/globals.h"
 #include "absl/strings/match.h"
 #include "absl/strings/str_cat.h"
 
@@ -38,6 +39,7 @@
 #define GPR_DEFAULT_LOG_VERBOSITY_STRING "ERROR"
 #endif  // !GPR_DEFAULT_LOG_VERBOSITY_STRING
 
+static constexpr int g_absl_vlog_level_for_gpr_verbosity_debug = 2;
 static constexpr gpr_atm GPR_LOG_SEVERITY_UNSET = GPR_LOG_SEVERITY_ERROR + 10;
 static constexpr gpr_atm GPR_LOG_SEVERITY_NONE = GPR_LOG_SEVERITY_ERROR + 11;
 
@@ -83,8 +85,9 @@ void gpr_default_log(gpr_log_func_args* args) {
   }
   switch (args->severity) {
     case GPR_LOG_SEVERITY_DEBUG:
-      //  Log DEBUG messages as VLOG(2).
-      VLOG(2).AtLocation(args->file, args->line) << args->message;
+      VLOG(g_absl_vlog_level_for_gpr_verbosity_debug)
+              .AtLocation(args->file, args->line)
+          << args->message;
       return;
     case GPR_LOG_SEVERITY_INFO:
       LOG(INFO).AtLocation(args->file, args->line) << args->message;
@@ -145,6 +148,12 @@ void gpr_log_verbosity_init() {
           parse_log_severity(verbosity, min_severity_to_print);
     }
     gpr_atm_no_barrier_store(&g_min_severity_to_print, min_severity_to_print);
+    if (grpc_core::ConfigVars::Get().AbslLogging() &&
+        min_severity_to_print == GPR_LOG_SEVERITY_DEBUG) {
+      // Matches full file paths that include a `*grpc*` folder, including
+      // grpcpp.
+      absl::SetVLogLevel("*grpc*/*", g_absl_vlog_level_for_gpr_verbosity_debug);
+    }
   }
   // init stacktrace_minloglevel when it hasn't been set
   if ((gpr_atm_no_barrier_load(&g_min_severity_to_print_stacktrace)) ==