Add support for message persistence

Signed-off-by: Chaitanya Munukutla <[email protected]>

events/pub.go

@@ -3,8 +3,10 @@ package events
 const Pub = "pub"
 
 type PubEvent struct {
-	Kind    string `json:"kind"`
-	Message string `json:"message"`
-	Topic   string `json:"topic"`
-	QoS     int    `json:"qos"`
+	Kind     string `json:"kind"`
+	PacketId string `json:"packet_id"`
+	Message  string `json:"message"`
+	Topic    string `json:"topic"`
+	QoS      int    `json:"qos"`
+	Retain   bool   `json:"retain"`
 }

go.mod

@@ -3,9 +3,27 @@ module github.com/c16a/microq
 go 1.22.2
 
 require (
+	github.com/dgraph-io/badger/v4 v4.2.0
 	github.com/google/uuid v1.6.0
 	github.com/gorilla/websocket v1.5.1
 	github.com/valyala/fastjson v1.6.4
 )
 
-require golang.org/x/net v0.17.0 // indirect
+require (
+	github.com/cespare/xxhash/v2 v2.2.0 // indirect
+	github.com/dgraph-io/ristretto v0.1.1 // indirect
+	github.com/dustin/go-humanize v1.0.0 // indirect
+	github.com/gogo/protobuf v1.3.2 // indirect
+	github.com/golang/glog v1.0.0 // indirect
+	github.com/golang/groupcache v0.0.0-20190702054246-869f871628b6 // indirect
+	github.com/golang/protobuf v1.5.2 // indirect
+	github.com/golang/snappy v0.0.3 // indirect
+	github.com/google/flatbuffers v1.12.1 // indirect
+	github.com/klauspost/compress v1.12.3 // indirect
+	github.com/pkg/errors v0.9.1 // indirect
+	github.com/stretchr/testify v1.8.1 // indirect
+	go.opencensus.io v0.22.5 // indirect
+	golang.org/x/net v0.17.0 // indirect
+	golang.org/x/sys v0.13.0 // indirect
+	google.golang.org/protobuf v1.28.1 // indirect
+)

go.sum

@@ -1,8 +1,127 @@
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+google.golang.org/protobuf v1.28.1 h1:d0NfwRgPtno5B1Wa6L2DAG+KivqkdutMf1UhdNx175w=
+google.golang.org/protobuf v1.28.1/go.mod h1:HV8QOd/L58Z+nl8r43ehVNZIU/HEI6OcFqwMG9pJV4I=
+gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
+gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
+gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
+gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
+honnef.co/go/tools v0.0.0-20190102054323-c2f93a96b099/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=

handlers/base.go

@@ -3,13 +3,14 @@ package handlers
 import (
 	"github.com/c16a/microq/broker"
 	"github.com/c16a/microq/events"
+	"github.com/c16a/microq/storage"
 )
 
-func HandleMessage(client *broker.ConnectedClient, broker *broker.Broker, message []byte) error {
+func HandleMessage(client *broker.ConnectedClient, broker *broker.Broker, sp storage.Provider, message []byte) error {
 	kind := events.GetKindFromJson(message)
 	switch kind {
 	case events.Pub:
-		return handlePublish(message, client, broker)
+		return handlePublish(message, client, broker, sp)
 	case events.PubRel:
 		return handlePubrel(message, client)
 	case events.Sub:

handlers/pub.go

@@ -4,29 +4,40 @@ import (
 	"encoding/json"
 	"github.com/c16a/microq/broker"
 	"github.com/c16a/microq/events"
+	"github.com/c16a/microq/storage"
 	"github.com/google/uuid"
 )
 
-func handlePublish(message []byte, client *broker.ConnectedClient, broker *broker.Broker) error {
+func handlePublish(message []byte, client *broker.ConnectedClient, broker *broker.Broker, sp storage.Provider) error {
 	var event events.PubEvent
 	err := json.Unmarshal(message, &event)
 	if err != nil {
 		return err
 	}
-	if event.QoS == 1 {
+	event.PacketId = uuid.New().String()
+
+	if event.Retain {
+		if err := sp.SaveMessage(&event); err != nil {
+			return err
+		}
+	}
+	go broker.Broadcast(event)
+
+	switch event.QoS {
+	case 1:
 		pubAckEvent := &events.PubAckEvent{
 			Kind:     events.PubAck,
-			PacketId: uuid.NewString(),
+			PacketId: event.PacketId,
 		}
 		client.WriteInterface(pubAckEvent)
-	}
-	if event.QoS == 2 {
+		break
+	case 2:
 		pubRecEvent := &events.PubRecEvent{
 			Kind:     events.PubRec,
-			PacketId: uuid.NewString(),
+			PacketId: event.PacketId,
 		}
 		client.WriteInterface(pubRecEvent)
+		break
 	}
-	go broker.Broadcast(event)
 	return nil
 }

main.go

@@ -3,20 +3,24 @@ package main
 import (
 	"github.com/c16a/microq/broker"
 	"github.com/c16a/microq/handlers"
+	"github.com/c16a/microq/storage"
 	"github.com/gorilla/websocket"
 	"log"
 	"net/http"
 )
 
 func main() {
+	var storageProvider = storage.NewBadgerProvider()
+	defer storageProvider.Close()
+
 	b := broker.NewBroker()
 	var upgrader = websocket.Upgrader{}
-	http.HandleFunc("/echo", echo(upgrader, b))
+	http.HandleFunc("/echo", echo(upgrader, b, storageProvider))
 
 	log.Fatal(http.ListenAndServe(":8080", nil))
 }
 
-func echo(upgrader websocket.Upgrader, b *broker.Broker) func(http.ResponseWriter, *http.Request) {
+func echo(upgrader websocket.Upgrader, b *broker.Broker, sp storage.Provider) func(http.ResponseWriter, *http.Request) {
 	return func(writer http.ResponseWriter, request *http.Request) {
 		c, err := upgrader.Upgrade(writer, request, nil)
 		if err != nil {
@@ -38,7 +42,7 @@ func echo(upgrader websocket.Upgrader, b *broker.Broker) func(http.ResponseWrite
 					continue
 				}
 			}
-			err = handlers.HandleMessage(client, b, message)
+			err = handlers.HandleMessage(client, b, sp, message)
 			if err != nil {
 				continue
 			}

storage/badger_provider.go

@@ -0,0 +1,49 @@
+package storage
+
+import (
+	"bytes"
+	"encoding/gob"
+	"fmt"
+	"github.com/c16a/microq/events"
+	"github.com/dgraph-io/badger/v4"
+	"github.com/dgraph-io/badger/v4/options"
+	"log"
+)
+
+type BadgerProvider struct {
+	db *badger.DB
+}
+
+func NewBadgerProvider() *BadgerProvider {
+	var opts badger.Options
+	opts = badger.DefaultOptions("/tmp/badger")
+	opts.Compression = options.ZSTD
+	opts.NumVersionsToKeep = 0
+	opts.CompactL0OnClose = true
+	opts.InMemory = false
+
+	db, err := badger.Open(opts)
+	if err != nil {
+		log.Fatal(err)
+	}
+	return &BadgerProvider{db: db}
+}
+
+func (b *BadgerProvider) SaveMessage(event *events.PubEvent) error {
+	buf := new(bytes.Buffer)
+	encoder := gob.NewEncoder(buf)
+	err := encoder.Encode(event)
+	if err != nil {
+		return err
+	}
+
+	storageKey := fmt.Sprintf("%s:%s", event.Topic, event.PacketId)
+	return b.db.Update(func(txn *badger.Txn) error {
+		entry := badger.NewEntry([]byte(storageKey), buf.Bytes())
+		return txn.SetEntry(entry)
+	})
+}
+
+func (b *BadgerProvider) Close() error {
+	return b.db.Close()
+}

storage/provider.go

@@ -0,0 +1,8 @@
+package storage
+
+import "github.com/c16a/microq/events"
+
+type Provider interface {
+	SaveMessage(event *events.PubEvent) error
+	Close() error
+}