1 files changed, 84 insertions, 0 deletions
diff --git a/internal/log_unix.go b/internal/log_unix.go
new file mode 100644
index 00000000..25ad0420
--- /dev/null
+++ b/internal/log_unix.go
@@ -0,0 +1,84 @@
+// Copyright 2021 The Matrix.org Foundation C.I.C.
+//
+// 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.
+
+// +build !windows
+
+package internal
+
+import (
+	"log/syslog"
+
+	"github.com/matrix-org/dendrite/setup/config"
+	"github.com/sirupsen/logrus"
+	lSyslog "github.com/sirupsen/logrus/hooks/syslog"
+)
+
+// SetupHookLogging configures the logging hooks defined in the configuration.
+// If something fails here it means that the logging was improperly configured,
+// so we just exit with the error
+func SetupHookLogging(hooks []config.LogrusHook, componentName string) {
+	logrus.SetReportCaller(true)
+	for _, hook := range hooks {
+		// Check we received a proper logging level
+		level, err := logrus.ParseLevel(hook.Level)
+		if err != nil {
+			logrus.Fatalf("Unrecognised logging level %s: %q", hook.Level, err)
+		}
+
+		// Perform a first filter on the logs according to the lowest level of all
+		// (Eg: If we have hook for info and above, prevent logrus from processing debug logs)
+		if logrus.GetLevel() < level {
+			logrus.SetLevel(level)
+		}
+
+		switch hook.Type {
+		case "file":
+			checkFileHookParams(hook.Params)
+			setupFileHook(hook, level, componentName)
+		case "syslog":
+			checkSyslogHookParams(hook.Params)
+			setupSyslogHook(hook, level, componentName)
+		default:
+			logrus.Fatalf("Unrecognised logging hook type: %s", hook.Type)
+		}
+	}
+}
+
+func checkSyslogHookParams(params map[string]interface{}) {
+	addr, ok := params["address"]
+	if !ok {
+		logrus.Fatalf("Expecting a parameter \"address\" for logging hook of type \"syslog\"")
+	}
+
+	if _, ok := addr.(string); !ok {
+		logrus.Fatalf("Parameter \"address\" for logging hook of type \"syslog\" should be a string")
+	}
+
+	proto, ok2 := params["protocol"]
+	if !ok2 {
+		logrus.Fatalf("Expecting a parameter \"protocol\" for logging hook of type \"syslog\"")
+	}
+
+	if _, ok2 := proto.(string); !ok2 {
+		logrus.Fatalf("Parameter \"protocol\" for logging hook of type \"syslog\" should be a string")
+	}
+
+}
+
+func setupSyslogHook(hook config.LogrusHook, level logrus.Level, componentName string) {
+	syslogHook, err := lSyslog.NewSyslogHook(hook.Params["protocol"].(string), hook.Params["address"].(string), syslog.LOG_INFO, componentName)
+	if err == nil {
+		logrus.AddHook(&logLevelHook{level, syslogHook})
+	}
+}