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spool.go
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spool.go
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// Copyright (c) 2021, R.I. Pienaar and the Choria Project contributors
//
// SPDX-License-Identifier: Apache-2.0
package submission
import (
"context"
"encoding/json"
"fmt"
"sync"
"time"
"github.com/choria-io/go-choria/inter"
"github.com/nats-io/jsm.go/api"
"github.com/nats-io/nats.go"
"github.com/sirupsen/logrus"
)
const (
defaultTTL = 7 * 24 * time.Hour
maxTTL = 31 * 24 * time.Hour
defaultTimeout = 2 * time.Second
defaultMaxSpoolEntries = 1000
)
type StoreType int
const (
Unknown StoreType = 0
Directory StoreType = 1
)
type Store interface {
NewMessage() *Message
StartPoll(context.Context, *sync.WaitGroup, func([]*Message) error) error
Complete(*Message) error
Discard(*Message) error
IncrementTries(*Message) error
Submit(msg *Message) error
}
type Submitter interface {
Submit(msg *Message) error
}
type Spool struct {
opts *spoolOpts
store Store
conn inter.RawNATSConnector
prefix string
log *logrus.Entry
}
func New(collective string, identity string, store StoreType, log *logrus.Entry, opts ...Option) (*Spool, error) {
if collective == "" {
return nil, fmt.Errorf("collective is required")
}
if identity == "" {
return nil, fmt.Errorf("identity is unknown")
}
sopts := &spoolOpts{maxSize: defaultMaxSpoolEntries}
for _, opt := range opts {
opt(sopts)
}
spool := &Spool{
log: log.WithField("component", "submission"),
prefix: fmt.Sprintf("%s.submission.in.", collective),
opts: sopts,
}
switch store {
case Directory:
st, err := NewDirectorySpool(sopts.spoolDir, sopts.maxSize, identity, spool.log)
if err != nil {
return nil, err
}
spool.store = st
default:
return nil, fmt.Errorf("unknown store type %v", store)
}
return spool, nil
}
func NewFromChoria(fw inter.Framework, store StoreType) (*Spool, error) {
cfg := fw.Configuration()
seed, _ := fw.SignerSeedFile()
token, _ := fw.SignerTokenFile()
return New(cfg.MainCollective, cfg.Identity, store, fw.Logger("submission"),
WithSpoolDirectory(cfg.Choria.SubmissionSpool),
WithMaxSpoolEntries(cfg.Choria.SubmissionSpoolMaxSize),
WithSeedFile(seed),
WithTokenFile(token))
}
func (s *Spool) Submit(msg *Message) error {
return s.store.Submit(msg)
}
func (s *Spool) NewMessage() *Message {
return s.store.NewMessage()
}
func (s *Spool) publishReliable(ctx context.Context, msg *nats.Msg, m *Message) (*api.JSPubAckResponse, error) {
pctx, cancel := context.WithTimeout(ctx, defaultTimeout)
defer cancel()
res, err := s.conn.RequestRawMsgWithContext(pctx, msg)
if err != nil {
return nil, fmt.Errorf("request failed: %s", err)
}
var ack api.JSPubAckResponse
err = json.Unmarshal(res.Data, &ack)
if err != nil {
return nil, fmt.Errorf("invalid ack: %s", err)
}
if ack.Error != nil {
return nil, fmt.Errorf("publish failed: %s", err)
}
s.store.Discard(m)
return &ack, nil
}
func (s *Spool) Run(ctx context.Context, wg *sync.WaitGroup, conn inter.RawNATSConnector) {
defer wg.Done()
s.conn = conn
wg.Add(1)
s.store.StartPoll(ctx, wg, func(msgs []*Message) error {
skipReliable := false
for _, m := range msgs {
msg, err := m.NatsMessage(s.prefix, s.opts.seedFile, s.opts.tokenFile)
if err != nil {
switch err {
case ErrMessageMaxTries:
s.log.Infof("Discarding max attempted message %s", m.ID)
case ErrMessageExpired:
s.log.Infof("Discarding expired message %s", m.ID)
default:
s.log.Errorf("Unknown error processing message, discarding %s: %s", m.ID, err)
}
s.store.Discard(m)
continue
}
// always do 1 attempt to publish unreliable messages
if !m.Reliable {
err = s.conn.PublishRawMsg(msg)
if err != nil {
s.log.Errorf("Could not publish unreliable message %s, discarding: %s", m.ID, err)
}
s.store.Discard(m)
continue
}
// if any reliable message fails we skip all future reliable messages to preserve order of reliable messages
if skipReliable {
continue
}
ack, err := s.publishReliable(ctx, msg, m)
if err != nil {
s.log.Errorf("Publishing reliable message %s to %s failed, skipping remaining reliable messages: %s", m.ID, msg.Subject, err)
s.store.IncrementTries(m)
skipReliable = true
continue
}
s.log.Debugf("Published message %s to stream %s with sequence %d duplicate=%v", m.ID, ack.Stream, ack.Sequence, ack.Duplicate)
}
return nil
})
<-ctx.Done()
}