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file.go
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file.go
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/*
http://www.apache.org/licenses/LICENSE-2.0.txt
Copyright 2016 Intel Corporation
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 file
import (
"bufio"
"bytes"
"encoding/gob"
"encoding/json"
"fmt"
"os"
"strings"
log "github.com/Sirupsen/logrus"
"github.com/intelsdi-x/snap/control/plugin"
"github.com/intelsdi-x/snap/control/plugin/cpolicy"
"github.com/intelsdi-x/snap/core/ctypes"
)
const (
name = "file"
version = 1
pluginType = plugin.PublisherPluginType
)
type filePublisher struct {
}
//NewFilePublisher returns an instance of filePublisher
func NewFilePublisher() *filePublisher {
return &filePublisher{}
}
func (f *filePublisher) Publish(contentType string, content []byte, config map[string]ctypes.ConfigValue) error {
logger := log.New()
logger.Println("Publishing started")
var metrics []plugin.MetricType
switch contentType {
case plugin.SnapGOBContentType:
dec := gob.NewDecoder(bytes.NewBuffer(content))
if err := dec.Decode(&metrics); err != nil {
logger.Printf("Error decoding: error=%v content=%v", err, content)
return err
}
default:
logger.Printf("Error unknown content type '%v'", contentType)
return fmt.Errorf("Unknown content type '%s'", contentType)
}
logger.Printf("publishing %v metrics to %v", len(metrics), config)
file, err := os.OpenFile(config["file"].(ctypes.ConfigValueStr).Value, os.O_APPEND|os.O_WRONLY|os.O_CREATE, 0666)
defer file.Close()
if err != nil {
logger.Printf("Error: %v", err)
return err
}
w := bufio.NewWriter(file)
jsonOut, err := json.Marshal(metrics)
if err != nil {
return fmt.Errorf("Error while marshalling metrics to JSON: %v", err)
}
w.Write(jsonOut)
w.WriteString("\n")
w.Flush()
return nil
}
// formatMetricTagsAsString returns metric's tags as a string in the following format tagKey:tagValue where the next tags are separated by semicolon
func formatMetricTagsAsString(metricTags map[string]string) string {
var tags string
for tag, value := range metricTags {
tags += fmt.Sprintf("%s:%s; ", tag, value)
}
// trim the last semicolon
tags = strings.TrimSuffix(tags, "; ")
return "tags[" + tags + "]"
}
//Meta returns metadata about the plugin
func Meta() *plugin.PluginMeta {
return plugin.NewPluginMeta(name, version, pluginType, []string{plugin.SnapGOBContentType}, []string{plugin.SnapGOBContentType})
}
func (f *filePublisher) GetConfigPolicy() (*cpolicy.ConfigPolicy, error) {
cp := cpolicy.New()
config := cpolicy.NewPolicyNode()
r1, err := cpolicy.NewStringRule("file", true)
handleErr(err)
r1.Description = "Absolute path to the output file for publishing"
config.Add(r1)
cp.Add([]string{""}, config)
return cp, nil
}
func handleErr(e error) {
if e != nil {
panic(e)
}
}