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