forked from RichardKnop/machinery
/
server.go
256 lines (211 loc) · 6.24 KB
/
server.go
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package machinery
import (
"errors"
"fmt"
"sync"
"github.com/RichardKnop/machinery/v1/backends"
"github.com/RichardKnop/machinery/v1/brokers"
"github.com/RichardKnop/machinery/v1/config"
"github.com/RichardKnop/machinery/v1/tasks"
"github.com/satori/go.uuid"
)
// Server is the main Machinery object and stores all configuration
// All the tasks workers process are registered against the server
type Server struct {
config *config.Config
registeredTasks map[string]interface{}
broker brokers.Interface
backend backends.Interface
}
// NewServer creates Server instance
func NewServer(cnf *config.Config) (*Server, error) {
broker, err := BrokerFactory(cnf)
if err != nil {
return nil, err
}
// Backend is optional so we ignore the error
backend, _ := BackendFactory(cnf)
srv := &Server{
config: cnf,
registeredTasks: make(map[string]interface{}),
broker: broker,
backend: backend,
}
// init for eager-mode
eager, ok := broker.(brokers.EagerMode)
if ok {
// we don't have to call worker.Lauch
// in eager mode
eager.AssignWorker(srv.NewWorker("eager", 0))
}
return srv, nil
}
// NewWorker creates Worker instance
func (server *Server) NewWorker(consumerTag string, concurrency int) *Worker {
return &Worker{
server: server,
ConsumerTag: consumerTag,
Concurrency: concurrency,
}
}
// GetBroker returns broker
func (server *Server) GetBroker() brokers.Interface {
return server.broker
}
// SetBroker sets broker
func (server *Server) SetBroker(broker brokers.Interface) {
server.broker = broker
}
// GetBackend returns backend
func (server *Server) GetBackend() backends.Interface {
return server.backend
}
// SetBackend sets backend
func (server *Server) SetBackend(backend backends.Interface) {
server.backend = backend
}
// GetConfig returns connection object
func (server *Server) GetConfig() *config.Config {
return server.config
}
// SetConfig sets config
func (server *Server) SetConfig(cnf *config.Config) {
server.config = cnf
}
// RegisterTasks registers all tasks at once
func (server *Server) RegisterTasks(namedTaskFuncs map[string]interface{}) error {
for _, task := range namedTaskFuncs {
if err := tasks.ValidateTask(task); err != nil {
return err
}
}
server.registeredTasks = namedTaskFuncs
server.broker.SetRegisteredTaskNames(server.GetRegisteredTaskNames())
return nil
}
// RegisterTask registers a single task
func (server *Server) RegisterTask(name string, taskFunc interface{}) error {
if err := tasks.ValidateTask(taskFunc); err != nil {
return err
}
server.registeredTasks[name] = taskFunc
server.broker.SetRegisteredTaskNames(server.GetRegisteredTaskNames())
return nil
}
// IsTaskRegistered returns true if the task name is registered with this broker
func (server *Server) IsTaskRegistered(name string) bool {
_, ok := server.registeredTasks[name]
return ok
}
// GetRegisteredTask returns registered task by name
func (server *Server) GetRegisteredTask(name string) (interface{}, error) {
taskFunc, ok := server.registeredTasks[name]
if !ok {
return nil, fmt.Errorf("Task not registered error: %s", name)
}
return taskFunc, nil
}
// SendTask publishes a task to the default queue
func (server *Server) SendTask(signature *tasks.Signature) (*backends.AsyncResult, error) {
// Make sure result backend is defined
if server.backend == nil {
return nil, errors.New("Result backend required")
}
// Auto generate a UUID if not set already
if signature.UUID == "" {
signature.UUID = fmt.Sprintf("task_%v", uuid.NewV4())
}
// Set initial task state to PENDING
if err := server.backend.SetStatePending(signature); err != nil {
return nil, fmt.Errorf("Set state pending error: %s", err)
}
if err := server.broker.Publish(signature); err != nil {
return nil, fmt.Errorf("Publish message error: %s", err)
}
return backends.NewAsyncResult(signature, server.backend), nil
}
// SendChain triggers a chain of tasks
func (server *Server) SendChain(chain *tasks.Chain) (*backends.ChainAsyncResult, error) {
_, err := server.SendTask(chain.Tasks[0])
if err != nil {
return nil, err
}
return backends.NewChainAsyncResult(chain.Tasks, server.backend), nil
}
// SendGroup triggers a group of parallel tasks
func (server *Server) SendGroup(group *tasks.Group, sendConcurrency int) ([]*backends.AsyncResult, error) {
// Make sure result backend is defined
if server.backend == nil {
return nil, errors.New("Result backend required")
}
asyncResults := make([]*backends.AsyncResult, len(group.Tasks))
var wg sync.WaitGroup
wg.Add(len(group.Tasks))
errorsChan := make(chan error, len(group.Tasks)*2)
// Init group
server.backend.InitGroup(group.GroupUUID, group.GetUUIDs())
// Init the tasks Pending state first
for _, signature := range group.Tasks {
if err := server.backend.SetStatePending(signature); err != nil {
errorsChan <- err
continue
}
}
pool := make(chan struct{}, sendConcurrency)
go func() {
for i := 0; i < sendConcurrency; i++ {
pool <- struct{}{}
}
}()
for i, signature := range group.Tasks {
if sendConcurrency > 0 {
<-pool
}
go func(s *tasks.Signature, index int) {
defer wg.Done()
// Publish task
err := server.broker.Publish(s)
if sendConcurrency > 0 {
pool <- struct{}{}
}
if err != nil {
errorsChan <- fmt.Errorf("Publish message error: %s", err)
return
}
asyncResults[index] = backends.NewAsyncResult(s, server.backend)
}(signature, i)
}
done := make(chan int)
go func() {
wg.Wait()
done <- 1
}()
select {
case err := <-errorsChan:
return asyncResults, err
case <-done:
return asyncResults, nil
}
}
// SendChord triggers a group of parallel tasks with a callback
func (server *Server) SendChord(chord *tasks.Chord, sendConcurrency int) (*backends.ChordAsyncResult, error) {
_, err := server.SendGroup(chord.Group, sendConcurrency)
if err != nil {
return nil, err
}
return backends.NewChordAsyncResult(
chord.Group.Tasks,
chord.Callback,
server.backend,
), nil
}
// GetRegisteredTaskNames returns slice of registered task names
func (server *Server) GetRegisteredTaskNames() []string {
taskNames := make([]string, len(server.registeredTasks))
var i = 0
for name := range server.registeredTasks {
taskNames[i] = name
i++
}
return taskNames
}