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server.go
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server.go
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package kick
import (
"errors"
"fmt"
"os"
"os/signal"
"syscall"
"time"
"github.com/go-redis/redis"
)
type JobResult struct {
worker *Worker
job *Job
completed bool
err error
}
type Server struct {
jobs []Job
isRunning bool
workers []*Worker
workerDone chan *JobResult
jobDefinitionMap map[string]*JobDefinition
redisClient *redis.Client
queue *Queue
fetcher *Fetcher
poller *Poller
}
type ServerConfiguration struct {
WorkerCount int
RedisURL string
}
func NewServer(config *ServerConfiguration, jobDefinitions []*JobDefinition) *Server {
jobDefinitionMap := map[string]*JobDefinition{}
for _, jobDefinition := range jobDefinitions {
jobDefinitionMap[jobDefinition.Name()] = jobDefinition
}
i := 0
workers := []*Worker{}
workerDone := make(chan *JobResult)
for i < config.WorkerCount {
workers = append(workers, NewWorker(workerDone, jobDefinitionMap))
i++
}
redisClient := redis.NewClient(&redis.Options{
Addr: config.RedisURL,
DB: 0, // use default DB
})
queue := NewQueue("defaultQueue", redisClient)
return &Server{
isRunning: false,
workers: workers,
workerDone: workerDone,
jobDefinitionMap: jobDefinitionMap,
redisClient: redisClient,
queue: queue,
fetcher: NewFetcher(queue),
poller: NewPoller(queue),
}
}
func (s *Server) handleWorkerDone(jobResult *JobResult) {
maxRetryCount := 3
s.queue.RemoveJobFromInprogress(jobResult.job)
if jobResult.completed {
fmt.Printf("Complete job %s %s\n", jobResult.job.JobDefinitionName, jobResult.job.ID)
} else {
job := jobResult.job
fmt.Printf("Failed job %s %s\n", job.JobDefinitionName, job.ID)
if job.Retry && job.RetryCount < maxRetryCount {
job.RetryCount++
retry, d := s.jobDefinitionMap[job.JobDefinitionName].RetryAt(job.RetryCount)
if retry {
job.EnqueuedAt = time.Now().Add(d)
s.queue.EnqueueJob(job.EnqueuedAt, job)
}
} else if job.RetryCount == maxRetryCount {
fmt.Printf("Job %s %s failed to much time \n", jobResult.job.JobDefinitionName, job.ID)
}
}
}
// Run kick server
func (s *Server) Run() error {
if s.isRunning {
return errors.New("Already running")
}
fmt.Println("kick server starting...")
s.isRunning = true
jobs := make(chan *Job)
workerReady := make(chan bool)
s.fetcher.Run(jobs, workerReady)
s.poller.Run()
term := make(chan os.Signal, 1)
signal.Notify(term, os.Interrupt, syscall.SIGTERM)
for _, worker := range s.workers {
go worker.Run(jobs, workerReady)
}
for {
select {
case jobResult := <-s.workerDone:
s.handleWorkerDone(jobResult)
case <-term:
fmt.Println("Gracefully shutting kick server")
go s.fetcher.Close()
go s.poller.Close()
s.fetcher.Wait()
s.poller.Wait()
close(s.workerDone)
for _, w := range s.workers {
w.Close()
}
return nil
}
}
}