Add logs-related parameters to the configuration

Signed-off-by: Tristan Claverie <public@tclaverie.eu>

dendrite-config.yaml

@@ -117,6 +117,13 @@ listen:
 tracing:
     # Config for the jaeger opentracing reporter.
     # See https://godoc.org/github.com/uber/jaeger-client-go/config#Configuration
-    # for documtation.
+    # for documentation.
     jaeger:
         disabled: true
+
+# The configuration for logs of dendrite
+logging:
+    # The logging level, must be one of debug, info, warn, error, fatal, panic.
+    level: "info"
+    # The file on which save logs. If commented, logs won't be saved by dendrite and only printed to stdout
+    # path: /var/log/dendrite.log

src/github.com/matrix-org/dendrite/common/config/config.go

@@ -206,6 +206,15 @@ type Dendrite struct {
 		Jaeger jaegerconfig.Configuration `yaml:"jaeger"`
 	}
 
+	// The config for logging informations
+	Logging struct {
+		// The path to the log file
+		FPath Path `yaml:"path"`
+
+		// The logging level
+		Level string `yaml:"level"`
+	} `yaml:"logging"`
+
 	// Any information derived from the configuration options for later use.
 	Derived struct {
 		Registration struct {
@@ -219,6 +228,9 @@ type Dendrite struct {
 			// registration in order to complete registration stages.
 			Params map[string]interface{} `json:"params"`
 		}
+
+		// The logrus level used for logging configuration
+		LogLevel logrus.Level
 	}
 }
 
@@ -472,6 +484,12 @@ func (config *Dendrite) check(monolithic bool) error {
 		checkNotEmpty("listen.room_server", string(config.Listen.RoomServer))
 	}
 
+	if level, err := logrus.ParseLevel(config.Logging.Level); err != nil {
+		problems = append(problems, fmt.Sprintf("Invalid value for key logging.level: %s", config.Logging.Level))
+	} else {
+		config.Derived.LogLevel = level
+	}
+
 	if problems != nil {
 		return Error{problems}
 	}

src/github.com/matrix-org/dendrite/common/config/config_test.go

@@ -59,6 +59,9 @@ listen:
   federation_api: "localhost:7772"
   sync_api: "localhost:7773"
   media_api: "localhost:7774"
+logging:
+  level: "debug"
+  path: "/my/log/dir/dendrite.log"
 `
 
 type mockReadFile map[string]string