logging: implement FATAL and DFATAL log levels

[folly.git] / folly / experimental / logging / LogCategory.cpp

diff --git a/folly/experimental/logging/LogCategory.cpp b/folly/experimental/logging/LogCategory.cpp
index 6f02c9dca6a090f6d474907747fcab70920ca4d6..ff06ba52d8eda0c507674c723b3fba1bf3e2e4e8 100644 (file)
--- a/folly/experimental/logging/LogCategory.cpp
+++ b/folly/experimental/logging/LogCategory.cpp
@@ -16,8 +16,10 @@
 #include <folly/experimental/logging/LogCategory.h>
 
 #include <cstdio>
+#include <cstdlib>
 
 #include <folly/ExceptionString.h>
+#include <folly/FileUtil.h>
 #include <folly/experimental/logging/LogHandler.h>
 #include <folly/experimental/logging/LogMessage.h>
 #include <folly/experimental/logging/LogName.h>
@@ -42,6 +44,31 @@ LogCategory::LogCategory(StringPiece name, LogCategory* parent)
   parent_->firstChild_ = this;
 }
 
+void LogCategory::admitMessage(const LogMessage& message) const {
+  processMessage(message);
+
+  // If this is a fatal message, flush the handlers to make sure the log
+  // message was written out, then crash.
+  if (isLogLevelFatal(message.getLevel())) {
+    auto numHandlers = db_->flushAllHandlers();
+    if (numHandlers == 0) {
+      // No log handlers were configured.
+      // Print the message to stderr, to make sure we always print the reason
+      // we are crashing somewhere.
+      auto msg = folly::to<std::string>(
+          "FATAL:",
+          message.getFileName(),
+          ":",
+          message.getLineNumber(),
+          ": ",
+          message.getMessage(),
+          "\n");
+      folly::writeFull(STDERR_FILENO, msg.data(), msg.size());
+    }
+    std::abort();
+  }
+}
+
 void LogCategory::processMessage(const LogMessage& message) const {
   // Make a copy of any attached LogHandlers, so we can release the handlers_
   // lock before holding them.
@@ -112,6 +139,10 @@ void LogCategory::clearHandlers() {
   // LogHandler destructors.
 }
 
+std::vector<std::shared_ptr<LogHandler>> LogCategory::getHandlers() const {
+  return *(handlers_.rlock());
+}
+
 void LogCategory::setLevel(LogLevel level, bool inherit) {
   // We have to set the level through LoggerDB, since we require holding
   // the LoggerDB lock to iterate through our children in case our effective