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file_content.go
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file_content.go
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// Copyright (c) 2021, R.I. Pienaar and the Choria Project contributors
//
// SPDX-License-Identifier: Apache-2.0
package registration
import (
"context"
"encoding/json"
"fmt"
"math/rand"
"os"
"sync"
"time"
"github.com/choria-io/go-choria/config"
"github.com/choria-io/go-choria/internal/util"
"github.com/choria-io/go-choria/server/data"
"github.com/sirupsen/logrus"
)
// FileContent is a fully managed registration plugin for the choria server instance
// it reads a file and publishing it to the collective regularly
type FileContent struct {
dataFile string
c *config.Config
log *logrus.Entry
prevMtime int64
}
// FileContentMessage contains message being published
type FileContentMessage struct {
Mtime int64 `json:"mtime"`
File string `json:"file"`
Updated bool `json:"updated"`
Protocol string `json:"protocol"`
Content []byte `json:"content,omitempty"`
ZContent []byte `json:"zcontent,omitempty"`
}
// NewFileContent creates a new fully managed registration plugin instance
func NewFileContent(c *config.Config, _ ServerInfoSource, logger *logrus.Entry) (*FileContent, error) {
if c.Choria.FileContentRegistrationData == "" {
return nil, fmt.Errorf("file fontent registration is enabled but no source data is configured, please set plugin.choria.registration.file_content.data")
}
reg := &FileContent{}
reg.Init(c, logger)
return reg, nil
}
// Init sets up the plugin
func (fc *FileContent) Init(c *config.Config, logger *logrus.Entry) {
fc.c = c
fc.dataFile = c.Choria.FileContentRegistrationData
fc.log = logger.WithFields(logrus.Fields{"registration": "file_content", "source": fc.dataFile})
fc.log.Infof("Configured File Content Registration with source '%s' and target '%s'", fc.dataFile, c.Choria.FileContentRegistrationTarget)
}
// StartRegistration starts stats a publishing loop
func (fc *FileContent) StartRegistration(ctx context.Context, wg *sync.WaitGroup, interval int, output chan *data.RegistrationItem) {
defer wg.Done()
delay := time.Duration(rand.Intn(4)+1) * time.Second
fc.log.Infof("Sleeping %v before first registration publish", delay)
err := util.InterruptibleSleep(ctx, delay)
if err != nil {
return
}
err = fc.publish(output)
if err != nil {
fc.log.Errorf("Could not create registration data: %s", err)
}
ticker := time.NewTicker(time.Duration(interval) * time.Second)
for {
select {
case <-ticker.C:
err = fc.publish(output)
if err != nil {
fc.log.Errorf("Could not create registration data: %s", err)
}
case <-ctx.Done():
return
}
}
}
func (fc *FileContent) publish(output chan *data.RegistrationItem) error {
fc.log.Infof("Starting file_content registration poll")
fstat, err := os.Stat(fc.dataFile)
if os.IsNotExist(err) {
return fmt.Errorf("could not find data file %s", fc.dataFile)
}
if fstat.Size() == 0 {
return fmt.Errorf("data file %s is empty", fc.dataFile)
}
fstat, err = os.Stat(fc.dataFile)
if err != nil {
return fmt.Errorf("could not obtain file times: %s", err)
}
dat, err := os.ReadFile(fc.dataFile)
if err != nil {
return fmt.Errorf("could not read file registration source %s: %s", fc.dataFile, err)
}
msg := &FileContentMessage{
Protocol: "choria:registration:filecontent:1",
File: fc.dataFile,
Mtime: fstat.ModTime().Unix(),
}
// the first time it starts we just have no idea, so we set it to whatever
// it is now which would also avoid setting updated=true, we do not want a
// large fleet restart to mass trigger a needless full site replication
if fc.prevMtime == 0 {
fc.prevMtime = msg.Mtime
}
if msg.Mtime > fc.prevMtime {
msg.Updated = true
fc.prevMtime = msg.Mtime
}
if fc.c.Choria.FileContentCompression {
zdat, err := compress(dat)
if err != nil {
fc.log.Warnf("Could not compress file registration data: %s", err)
} else {
msg.ZContent = zdat
}
}
if msg.ZContent == nil {
msg.Content = dat
}
jdat, err := json.Marshal(msg)
if err != nil {
return fmt.Errorf("could not json marshal registration message: %s", err)
}
item := &data.RegistrationItem{
Data: jdat,
Destination: fc.c.Choria.FileContentRegistrationTarget,
}
if item.Destination == "" {
item.TargetAgent = "registration"
}
output <- item
return nil
}