use go module for dependencies (#594)

common/basecomponent/flags.go

@@ -0,0 +1,61 @@
+// Copyright 2017 New Vector Ltd
+//
+// 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.
+
+package basecomponent
+
+import (
+	"flag"
+
+	"github.com/matrix-org/dendrite/common/config"
+
+	"github.com/sirupsen/logrus"
+)
+
+var configPath = flag.String("config", "dendrite.yaml", "The path to the config file. For more information, see the config file in this repository.")
+
+// ParseFlags parses the commandline flags and uses them to create a config.
+// If running as a monolith use `ParseMonolithFlags` instead.
+func ParseFlags() *config.Dendrite {
+	flag.Parse()
+
+	if *configPath == "" {
+		logrus.Fatal("--config must be supplied")
+	}
+
+	cfg, err := config.Load(*configPath)
+
+	if err != nil {
+		logrus.Fatalf("Invalid config file: %s", err)
+	}
+
+	return cfg
+}
+
+// ParseMonolithFlags parses the commandline flags and uses them to create a
+// config. Should only be used if running a monolith. See `ParseFlags`.
+func ParseMonolithFlags() *config.Dendrite {
+	flag.Parse()
+
+	if *configPath == "" {
+		logrus.Fatal("--config must be supplied")
+	}
+
+	cfg, err := config.LoadMonolithic(*configPath)
+
+	if err != nil {
+		logrus.Fatalf("Invalid config file: %s", err)
+	}
+
+	return cfg
+}