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phpfpm.go
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phpfpm.go
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// Copyright © 2018 Enrico Stahn <enrico.stahn@gmail.com>
// 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 phpfpm provides convenient access to PHP-FPM pool data
package phpfpm
import (
"encoding/json"
"fmt"
"github.com/tomasen/fcgi_client"
"io/ioutil"
"net/url"
"strconv"
"sync"
"time"
)
var log logger
type logger interface {
Debugf(string, ...interface{})
Error(ar ...interface{})
}
// PoolManager manages all configured Pools
type PoolManager struct {
Pools []Pool `json:"pools"`
}
// Pool describes a single PHP-FPM pool that can be reached via a Socket or TCP address
type Pool struct {
// The address of the pool, e.g. tcp://127.0.0.1:9000 or unix:///tmp/php-fpm.sock
Address string `json:"-"`
CollectionError error `json:"-"`
Name string `json:"pool"`
ProcessManager string `json:"process manager"`
StartTime timestamp `json:"start time"`
StartSince int `json:"start since"`
AcceptedConnections int `json:"accepted conn"`
ListenQueue int `json:"listen queue"`
MaxListenQueue int `json:"max listen queue"`
ListenQueueLength int `json:"listen queue len"`
IdleProcesses int `json:"idle processes"`
ActiveProcesses int `json:"active processes"`
TotalProcesses int `json:"total processes"`
MaxActiveProcesses int `json:"max active processes"`
MaxChildrenReached int `json:"max children reached"`
SlowRequests int `json:"slow requests"`
Processes []PoolProcess `json:"processes"`
}
// PoolProcess describes a single PHP-FPM process. A pool can have multiple processes.
type PoolProcess struct {
PID int `json:"pid"`
State string `json:"state"`
StartTime int `json:"start time"`
StartSince int `json:"start since"`
Requests int `json:"requests"`
RequestDuration int `json:"request duration"`
RequestMethod string `json:"request method"`
RequestURI string `json:"request uri"`
ContentLength int `json:"content length"`
User string `json:"user"`
Script string `json:"script"`
LastRequestCPU float32 `json:"last request cpu"`
LastRequestMemory int `json:"last request memory"`
}
// Add will add a pool to the pool manager based on the given URI.
func (pm *PoolManager) Add(uri string) Pool {
p := Pool{Address: uri}
pm.Pools = append(pm.Pools, p)
return p
}
// Update will run the pool.Update() method concurrently on all Pools.
func (pm *PoolManager) Update() (err error) {
wg := &sync.WaitGroup{}
started := time.Now()
for idx := range pm.Pools {
wg.Add(1)
go func(p *Pool) {
defer wg.Done()
p.Update()
}(&pm.Pools[idx])
}
wg.Wait()
ended := time.Now()
log.Debugf("Updated %v pool(s) in %v", len(pm.Pools), ended.Sub(started))
return nil
}
// Update will connect to PHP-FPM and retrieve the latest data for the pool.
func (p *Pool) Update() (err error) {
p.CollectionError = nil
env := make(map[string]string)
env["SCRIPT_FILENAME"] = "/status"
env["SCRIPT_NAME"] = "/status"
env["SERVER_SOFTWARE"] = "go / php-fpm_exporter "
env["REMOTE_ADDR"] = "127.0.0.1"
env["QUERY_STRING"] = "json&full"
uri, err := url.Parse(p.Address)
if err != nil {
return p.error(err)
}
fcgi, err := fcgiclient.DialTimeout(uri.Scheme, uri.Hostname()+":"+uri.Port(), time.Duration(3)*time.Second)
if err != nil {
return p.error(err)
}
resp, err := fcgi.Get(env)
if err != nil {
return p.error(err)
}
content, err := ioutil.ReadAll(resp.Body)
if err != nil {
return p.error(err)
}
fcgi.Close()
log.Debugf("Pool[", p.Address, "]:", string(content))
if err = json.Unmarshal(content, &p); err != nil {
return p.error(err)
}
return nil
}
func (p *Pool) error(err error) error {
p.CollectionError = err
log.Error(err)
return err
}
type timestamp time.Time
// MarshalJSON customise JSON for timestamp
func (t *timestamp) MarshalJSON() ([]byte, error) {
ts := time.Time(*t).Unix()
stamp := fmt.Sprint(ts)
return []byte(stamp), nil
}
// UnmarshalJSON customise JSON for timestamp
func (t *timestamp) UnmarshalJSON(b []byte) error {
ts, err := strconv.Atoi(string(b))
if err != nil {
return err
}
*t = timestamp(time.Unix(int64(ts), 0))
return nil
}
// SetLogger configures the used logger
func SetLogger(logger logger) {
log = logger
}