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plugin.go
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plugin.go
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package newrelic_platform_go
import (
"bytes"
"encoding/json"
"fmt"
"log"
"net/http"
"strings"
"time"
)
const (
NEWRELIC_API_URL = "https://platform-api.newrelic.com/platform/v1/metrics"
)
type INewrelicPlugin interface {
GetMetricaKey(metrica IMetrica) string
Harvest() error
Run()
AddComponent(component IComponent)
}
type NewrelicPlugin struct {
Agent *Agent `json:"agent"`
Components []ComponentData `json:"components"`
// All HTTP requests will be done using this client. Change it if you need
// to use a proxy.
Client http.Client `json:"-"`
// The URL to use for New Relic. Can change for testing purposes. Defaults to NERELIC_API_URL
URL string
ComponentModels []IComponent `json:"-"`
LastPollTime time.Time `json:"-"`
Verbose bool `json:"-"`
LicenseKey string `json:"-"`
PollIntervalInSecond int `json:"-"`
}
func NewNewrelicPlugin(version string, licenseKey string, pollInterval int) *NewrelicPlugin {
plugin := &NewrelicPlugin{
LicenseKey: licenseKey,
PollIntervalInSecond: pollInterval,
}
plugin.Agent = NewAgent(version)
plugin.Agent.CollectEnvironmentInfo()
plugin.URL = NEWRELIC_API_URL
plugin.ComponentModels = []IComponent{}
return plugin
}
func (plugin *NewrelicPlugin) Harvest() error {
startTime := time.Now()
var duration int
if plugin.LastPollTime.IsZero() {
duration = plugin.PollIntervalInSecond
} else {
duration = int(startTime.Sub(plugin.LastPollTime).Seconds())
}
plugin.Components = make([]ComponentData, 0, len(plugin.ComponentModels))
for i := 0; i < len(plugin.ComponentModels); i++ {
plugin.ComponentModels[i].SetDuration(duration)
plugin.Components = append(plugin.Components, plugin.ComponentModels[i].Harvest(plugin))
}
if httpCode, err := plugin.SendMetricas(); err != nil {
log.Printf("Can not send metricas to newrelic: %v\n", err)
return err
} else {
if plugin.Verbose {
log.Printf("Got HTTP response code:%d", httpCode)
}
if err, isFatal := plugin.CheckResponse(httpCode); isFatal {
log.Printf("Got fatal error:%v\n", err)
return err
} else {
if err != nil {
log.Printf("WARNING: %v", err)
}
return err
}
}
return nil
}
func (plugin *NewrelicPlugin) GetMetricaKey(metrica IMetrica) string {
var keyBuffer bytes.Buffer
keyBuffer.WriteString("Component/")
keyBuffer.WriteString(metrica.GetName())
keyBuffer.WriteString("[")
keyBuffer.WriteString(metrica.GetUnits())
keyBuffer.WriteString("]")
return keyBuffer.String()
}
func (plugin *NewrelicPlugin) SendMetricas() (int, error) {
var metricasJson []byte
var encodingError error
if plugin.Verbose {
metricasJson, encodingError = json.MarshalIndent(plugin, "", " ")
} else {
metricasJson, encodingError = json.Marshal(plugin)
}
if encodingError != nil {
return 0, encodingError
}
jsonAsString := string(metricasJson)
if plugin.Verbose {
log.Printf("Send data:%s \n", jsonAsString)
}
if httpRequest, err := http.NewRequest("POST", plugin.URL, strings.NewReader(jsonAsString)); err != nil {
return 0, err
} else {
httpRequest.Header.Set("X-License-Key", plugin.LicenseKey)
httpRequest.Header.Set("Content-Type", "application/json")
httpRequest.Header.Set("Accept", "application/json")
if httpResponse, err := plugin.Client.Do(httpRequest); err != nil {
return 0, err
} else {
defer httpResponse.Body.Close()
return httpResponse.StatusCode, nil
}
}
// we will never get there
return 0, nil
}
func (plugin *NewrelicPlugin) ClearSentData() {
for _, component := range plugin.ComponentModels {
component.ClearSentData()
}
plugin.Components = nil
plugin.LastPollTime = time.Now()
}
func (plugin *NewrelicPlugin) CheckResponse(httpResponseCode int) (error, bool) {
isFatal := false
var err error
switch httpResponseCode {
case http.StatusOK:
{
plugin.ClearSentData()
}
case http.StatusForbidden:
{
err = fmt.Errorf("Authentication error (no license key header, or invalid license key).\n")
isFatal = true
}
case http.StatusBadRequest:
{
err = fmt.Errorf("The request or headers are in the wrong format or the URL is incorrect.\n")
isFatal = true
}
case http.StatusNotFound:
{
err = fmt.Errorf("Invalid URL\n")
isFatal = true
}
case http.StatusRequestEntityTooLarge:
{
err = fmt.Errorf("Too many metrics were sent in one request, or too many components (instances) were specified in one request, or other single-request limits were reached.\n")
//discard metrics
plugin.ClearSentData()
}
case http.StatusInternalServerError, http.StatusBadGateway, http.StatusServiceUnavailable, http.StatusGatewayTimeout:
{
err = fmt.Errorf("Got %v response code.Metricas will be aggregated", httpResponseCode)
}
}
return err, isFatal
}
func (plugin *NewrelicPlugin) Run() {
plugin.Harvest()
tickerChannel := time.Tick(time.Duration(plugin.PollIntervalInSecond) * time.Second)
for ts := range tickerChannel {
plugin.Harvest()
if plugin.Verbose {
log.Printf("Harvest ended at:%v\n", ts)
}
}
}
func (plugin *NewrelicPlugin) AddComponent(component IComponent) {
plugin.ComponentModels = append(plugin.ComponentModels, component)
}