logging: split FileHandlerFactory into two classes

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

diff --git a/folly/experimental/logging/StreamHandlerFactory.cpp b/folly/experimental/logging/StreamHandlerFactory.cpp
new file mode 100644 (file)
index 0000000..55c5c42
--- /dev/null
+++ b/folly/experimental/logging/StreamHandlerFactory.cpp
@@ -0,0 +1,67 @@
+/*
+ * Copyright 2004-present Facebook, Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+#include <folly/experimental/logging/StreamHandlerFactory.h>
+
+#include <folly/Conv.h>
+#include <folly/experimental/logging/FileWriterFactory.h>
+#include <folly/experimental/logging/StandardLogHandler.h>
+#include <folly/experimental/logging/StandardLogHandlerFactory.h>
+
+namespace folly {
+
+class StreamHandlerFactory::WriterFactory
+    : public StandardLogHandlerFactory::WriterFactory {
+ public:
+  bool processOption(StringPiece name, StringPiece value) override {
+    if (name == "stream") {
+      stream_ = value.str();
+      return true;
+    }
+    return fileWriterFactory_.processOption(name, value);
+  }
+
+  std::shared_ptr<LogWriter> createWriter() override {
+    // Get the output file to use
+    File outputFile;
+    if (stream_.empty()) {
+      throw std::invalid_argument(
+          "no stream name specified for stream handler");
+    } else if (stream_ == "stderr") {
+      outputFile = File{STDERR_FILENO, /* ownsFd */ false};
+    } else if (stream_ == "stdout") {
+      outputFile = File{STDOUT_FILENO, /* ownsFd */ false};
+    } else {
+      throw std::invalid_argument(to<std::string>(
+          "unknown stream \"",
+          stream_,
+          "\": expected one of stdout or stderr"));
+    }
+
+    return fileWriterFactory_.createWriter(std::move(outputFile));
+  }
+
+  std::string stream_;
+  FileWriterFactory fileWriterFactory_;
+};
+
+std::shared_ptr<LogHandler> StreamHandlerFactory::createHandler(
+    const Options& options) {
+  WriterFactory writerFactory;
+  return StandardLogHandlerFactory::createHandler(
+      getType(), &writerFactory, options);
+}
+
+} // namespace folly