forked from RichardKnop/machinery
/
mongodb.go
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/
mongodb.go
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package mongo
import (
"context"
"encoding/json"
"fmt"
"reflect"
"strings"
"sync"
"time"
"go.mongodb.org/mongo-driver/bson"
"go.mongodb.org/mongo-driver/mongo"
"go.mongodb.org/mongo-driver/mongo/options"
"github.com/sh0umik/machinery/v1/backends/iface"
"github.com/sh0umik/machinery/v1/common"
"github.com/sh0umik/machinery/v1/config"
"github.com/sh0umik/machinery/v1/log"
"github.com/sh0umik/machinery/v1/tasks"
)
// Backend represents a MongoDB result backend
type Backend struct {
common.Backend
client *mongo.Client
tc *mongo.Collection
gmc *mongo.Collection
once sync.Once
}
// New creates Backend instance
func New(cnf *config.Config) (iface.Backend, error) {
backend := &Backend{
Backend: common.NewBackend(cnf),
once: sync.Once{},
}
return backend, nil
}
// InitGroup creates and saves a group meta data object
func (b *Backend) InitGroup(groupUUID string, taskUUIDs []string) error {
groupMeta := &tasks.GroupMeta{
GroupUUID: groupUUID,
TaskUUIDs: taskUUIDs,
CreatedAt: time.Now().UTC(),
}
_, err := b.groupMetasCollection().InsertOne(context.Background(), groupMeta)
return err
}
// GroupCompleted returns true if all tasks in a group finished
func (b *Backend) GroupCompleted(groupUUID string, groupTaskCount int) (bool, error) {
groupMeta, err := b.getGroupMeta(groupUUID)
if err != nil {
return false, err
}
taskStates, err := b.getStates(groupMeta.TaskUUIDs...)
if err != nil {
return false, err
}
var countSuccessTasks = 0
for _, taskState := range taskStates {
if taskState.IsCompleted() {
countSuccessTasks++
}
}
return countSuccessTasks == groupTaskCount, nil
}
// GroupTaskStates returns states of all tasks in the group
func (b *Backend) GroupTaskStates(groupUUID string, groupTaskCount int) ([]*tasks.TaskState, error) {
groupMeta, err := b.getGroupMeta(groupUUID)
if err != nil {
return []*tasks.TaskState{}, err
}
return b.getStates(groupMeta.TaskUUIDs...)
}
// TriggerChord flags chord as triggered in the backend storage to make sure
// chord is never triggered multiple times. Returns a boolean flag to indicate
// whether the worker should trigger chord (true) or no if it has been triggered
// already (false)
func (b *Backend) TriggerChord(groupUUID string) (bool, error) {
query := bson.M{
"_id": groupUUID,
"chord_triggered": false,
}
change := bson.M{
"$set": bson.M{
"chord_triggered": true,
},
}
_, err := b.groupMetasCollection().UpdateOne(context.Background(), query, change, options.Update())
if err != nil {
if err == mongo.ErrNoDocuments {
log.WARNING.Printf("Chord already triggered for group %s", groupUUID)
return false, nil
}
return false, err
}
return true, nil
}
// SetStatePending updates task state to PENDING
func (b *Backend) SetStatePending(signature *tasks.Signature) error {
update := bson.M{
"state": tasks.StatePending,
"task_name": signature.Name,
"created_at": time.Now().UTC(),
}
return b.updateState(signature, update)
}
// SetStateReceived updates task state to RECEIVED
func (b *Backend) SetStateReceived(signature *tasks.Signature) error {
update := bson.M{"state": tasks.StateReceived}
return b.updateState(signature, update)
}
// SetStateStarted updates task state to STARTED
func (b *Backend) SetStateStarted(signature *tasks.Signature) error {
update := bson.M{"state": tasks.StateStarted}
return b.updateState(signature, update)
}
// SetStateRetry updates task state to RETRY
func (b *Backend) SetStateRetry(signature *tasks.Signature) error {
update := bson.M{"state": tasks.StateRetry}
return b.updateState(signature, update)
}
// SetStateSuccess updates task state to SUCCESS
func (b *Backend) SetStateSuccess(signature *tasks.Signature, results []*tasks.TaskResult) error {
decodedResults := b.decodeResults(results)
update := bson.M{
"state": tasks.StateSuccess,
"results": decodedResults,
}
return b.updateState(signature, update)
}
// decodeResults detects & decodes json strings in TaskResult.Value and returns a new slice
func (b *Backend) decodeResults(results []*tasks.TaskResult) []*tasks.TaskResult {
l := len(results)
jsonResults := make([]*tasks.TaskResult, l)
for i, result := range results {
jsonResult := new(bson.M)
resultType := reflect.TypeOf(result.Value).Kind()
if resultType == reflect.String {
err := json.NewDecoder(strings.NewReader(result.Value.(string))).Decode(&jsonResult)
if err == nil {
jsonResults[i] = &tasks.TaskResult{
Type: "json",
Value: jsonResult,
}
continue
}
}
jsonResults[i] = result
}
return jsonResults
}
// SetStateFailure updates task state to FAILURE
func (b *Backend) SetStateFailure(signature *tasks.Signature, err string) error {
update := bson.M{"state": tasks.StateFailure, "error": err}
return b.updateState(signature, update)
}
// GetState returns the latest task state
func (b *Backend) GetState(taskUUID string) (*tasks.TaskState, error) {
state := &tasks.TaskState{}
err := b.tasksCollection().FindOne(context.Background(), bson.M{"_id": taskUUID}).Decode(state)
if err != nil {
return nil, err
}
return state, nil
}
// PurgeState deletes stored task state
func (b *Backend) PurgeState(taskUUID string) error {
_, err := b.tasksCollection().DeleteOne(context.Background(), bson.M{"_id": taskUUID})
return err
}
// PurgeGroupMeta deletes stored group meta data
func (b *Backend) PurgeGroupMeta(groupUUID string) error {
_, err := b.groupMetasCollection().DeleteOne(context.Background(), bson.M{"_id": groupUUID})
return err
}
// lockGroupMeta acquires lock on groupUUID document
func (b *Backend) lockGroupMeta(groupUUID string) error {
query := bson.M{
"_id": groupUUID,
"lock": false,
}
change := bson.M{
"$set": bson.M{
"lock": true,
},
}
_, err := b.groupMetasCollection().UpdateOne(context.Background(), query, change, options.Update().SetUpsert(true))
return err
}
// unlockGroupMeta releases lock on groupUUID document
func (b *Backend) unlockGroupMeta(groupUUID string) error {
update := bson.M{"$set": bson.M{"lock": false}}
_, err := b.groupMetasCollection().UpdateOne(context.Background(), bson.M{"_id": groupUUID}, update, options.Update())
return err
}
// getGroupMeta retrieves group meta data, convenience function to avoid repetition
func (b *Backend) getGroupMeta(groupUUID string) (*tasks.GroupMeta, error) {
groupMeta := &tasks.GroupMeta{}
query := bson.M{"_id": groupUUID}
err := b.groupMetasCollection().FindOne(context.Background(), query).Decode(groupMeta)
if err != nil {
return nil, err
}
return groupMeta, nil
}
// getStates returns multiple task states
func (b *Backend) getStates(taskUUIDs ...string) ([]*tasks.TaskState, error) {
states := make([]*tasks.TaskState, 0, len(taskUUIDs))
cur, err := b.tasksCollection().Find(context.Background(), bson.M{"_id": bson.M{"$in": taskUUIDs}})
if err != nil {
return nil, err
}
defer cur.Close(context.Background())
for cur.Next(context.Background()) {
state := &tasks.TaskState{}
if err := cur.Decode(state); err != nil {
return nil, err
}
states = append(states, state)
}
if cur.Err() != nil {
return nil, err
}
return states, nil
}
// updateState saves current task state
func (b *Backend) updateState(signature *tasks.Signature, update bson.M) error {
update = bson.M{"$set": update}
_, err := b.tasksCollection().UpdateOne(context.Background(), bson.M{"_id": signature.UUID}, update, options.Update().SetUpsert(true))
return err
}
func (b *Backend) tasksCollection() *mongo.Collection {
b.once.Do(func() {
b.connect()
})
return b.tc
}
func (b *Backend) groupMetasCollection() *mongo.Collection {
b.once.Do(func() {
b.connect()
})
return b.gmc
}
// connect creates the underlying mgo connection if it doesn't exist
// creates required indexes for our collections
func (b *Backend) connect() error {
client, err := b.dial()
if err != nil {
return err
}
b.client = client
database := "machinery"
if b.GetConfig().MongoDB != nil {
database = b.GetConfig().MongoDB.Database
}
b.tc = b.client.Database(database).Collection("tasks")
b.gmc = b.client.Database(database).Collection("group_metas")
err = b.createMongoIndexes(database)
if err != nil {
return err
}
return nil
}
// dial connects to mongo with TLSConfig if provided
// else connects via ResultBackend uri
func (b *Backend) dial() (*mongo.Client, error) {
if b.GetConfig().MongoDB != nil && b.GetConfig().MongoDB.Client != nil {
return b.GetConfig().MongoDB.Client, nil
}
uri := b.GetConfig().ResultBackend
if strings.HasPrefix(uri, "mongodb://") == false &&
strings.HasPrefix(uri, "mongodb+srv://") == false {
uri = fmt.Sprintf("mongodb://%s", uri)
}
client, err := mongo.NewClient(options.Client().ApplyURI(uri))
if err != nil {
return nil, err
}
ctx, cancel := context.WithTimeout(context.Background(), 10*time.Second)
defer cancel()
if err := client.Connect(ctx); err != nil {
return nil, err
}
return client, nil
}
// createMongoIndexes ensures all indexes are in place
func (b *Backend) createMongoIndexes(database string) error {
tasksCollection := b.client.Database(database).Collection("tasks")
expireIn := int32(b.GetConfig().ResultsExpireIn)
_, err := tasksCollection.Indexes().CreateMany(context.Background(), []mongo.IndexModel{
{
Keys: bson.M{"state": 1},
Options: options.Index().SetBackground(true).SetExpireAfterSeconds(expireIn),
},
mongo.IndexModel{
Keys: bson.M{"lock": 1},
Options: options.Index().SetBackground(true).SetExpireAfterSeconds(expireIn),
},
})
if err != nil {
return err
}
return err
}