sources.go

// Copyright 2015 Google Inc. All Rights Reserved.
//
// 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 main

import (
	"fmt"
	"net/url"

	"github.com/GoogleCloudPlatform/heapster/extpoints"
	"github.com/GoogleCloudPlatform/heapster/sources/api"
)

func newSources() ([]api.Source, error) {
	var sources []api.Source
	for _, sourceFlag := range argSources {
		uri, err := url.Parse(sourceFlag)
		if err != nil {
			return nil, err
		}
		if len(uri.Scheme) == 0 || len(uri.Opaque) == 0 {
			return nil, fmt.Errorf("Invalid source definition: %s", sourceFlag)
		}
		factory := extpoints.SourceFactories.Lookup(uri.Scheme)
		if factory == nil {
			return nil, fmt.Errorf("Unknown source: %s", uri.Scheme)
		}

		createdSources, err := factory(uri.Opaque, uri.Query())
		if err != nil {
			return nil, err
		}
		sources = append(sources, createdSources...)
	}
	return sources, nil
}