150 lines
3.2 KiB
Go
150 lines
3.2 KiB
Go
package twemproxy
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import (
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"encoding/json"
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"errors"
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"io/ioutil"
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"net"
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"time"
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"github.com/influxdb/telegraf/plugins/inputs"
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)
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type Twemproxy struct {
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Addr string
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Pools []string
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}
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var sampleConfig = `
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# Twemproxy stats address and port (no scheme)
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addr = "localhost:22222"
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# Monitor pool name
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pools = ["redis_pool", "mc_pool"]
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`
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func (t *Twemproxy) SampleConfig() string {
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return sampleConfig
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}
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func (t *Twemproxy) Description() string {
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return "Read Twemproxy stats data"
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}
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// Gather data from all Twemproxy instances
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func (t *Twemproxy) Gather(acc inputs.Accumulator) error {
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conn, err := net.DialTimeout("tcp", t.Addr, 1*time.Second)
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if err != nil {
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return err
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}
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body, err := ioutil.ReadAll(conn)
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if err != nil {
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return err
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}
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var stats map[string]interface{}
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if err = json.Unmarshal(body, &stats); err != nil {
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return errors.New("Error decoding JSON response")
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}
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tags := make(map[string]string)
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tags["twemproxy"] = t.Addr
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t.processStat(acc, tags, stats)
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return nil
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}
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// Process Twemproxy server stats
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func (t *Twemproxy) processStat(
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acc inputs.Accumulator,
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tags map[string]string,
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data map[string]interface{},
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) {
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if source, ok := data["source"]; ok {
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if val, ok := source.(string); ok {
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tags["source"] = val
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}
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}
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fields := make(map[string]interface{})
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metrics := []string{"total_connections", "curr_connections", "timestamp"}
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for _, m := range metrics {
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if value, ok := data[m]; ok {
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if val, ok := value.(float64); ok {
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fields[m] = val
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}
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}
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}
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acc.AddFields("twemproxy", fields, tags)
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for _, pool := range t.Pools {
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if poolStat, ok := data[pool]; ok {
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if data, ok := poolStat.(map[string]interface{}); ok {
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poolTags := copyTags(tags)
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poolTags["pool"] = pool
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t.processPool(acc, poolTags, data)
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}
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}
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}
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}
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// Process pool data in Twemproxy stats
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func (t *Twemproxy) processPool(
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acc inputs.Accumulator,
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tags map[string]string,
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data map[string]interface{},
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) {
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serverTags := make(map[string]map[string]string)
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fields := make(map[string]interface{})
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for key, value := range data {
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switch key {
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case "client_connections", "forward_error", "client_err", "server_ejects", "fragments", "client_eof":
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if val, ok := value.(float64); ok {
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fields[key] = val
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}
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default:
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if data, ok := value.(map[string]interface{}); ok {
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if _, ok := serverTags[key]; !ok {
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serverTags[key] = copyTags(tags)
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serverTags[key]["server"] = key
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}
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t.processServer(acc, serverTags[key], data)
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}
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}
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}
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acc.AddFields("twemproxy_pool", fields, tags)
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}
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// Process backend server(redis/memcached) stats
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func (t *Twemproxy) processServer(
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acc inputs.Accumulator,
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tags map[string]string,
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data map[string]interface{},
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) {
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fields := make(map[string]interface{})
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for key, value := range data {
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switch key {
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default:
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if val, ok := value.(float64); ok {
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fields[key] = val
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}
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}
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}
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acc.AddFields("twemproxy_pool_server", fields, tags)
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}
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// Tags is not expected to be mutated after passing to Add.
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func copyTags(tags map[string]string) map[string]string {
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newTags := make(map[string]string)
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for k, v := range tags {
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newTags[k] = v
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}
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return newTags
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}
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func init() {
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inputs.Add("twemproxy", func() inputs.Input {
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return &Twemproxy{}
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})
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}
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