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nats.go
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nats.go
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package toolbelt
import (
"context"
"errors"
"fmt"
"log"
"os"
"github.com/cenkalti/backoff"
"github.com/nats-io/nats-server/v2/server"
"github.com/nats-io/nats.go"
lop "github.com/samber/lo/parallel"
"google.golang.org/protobuf/proto"
"google.golang.org/protobuf/reflect/protoreflect"
)
type EmbeddedNATsServer struct {
NatsServer *server.Server
}
func NewEmbeddedNATsServer(ctx context.Context, clearData bool) (*EmbeddedNATsServer, error) {
const dataDir = "./data/example"
if clearData {
if err := os.RemoveAll(dataDir); err != nil {
return nil, err
}
}
// Initialize new server with options
ns, err := server.NewServer(&server.Options{
JetStream: true,
StoreDir: dataDir,
Websocket: server.WebsocketOpts{
Port: 4443,
NoTLS: true,
},
HTTPPort: 8882,
})
if err != nil {
panic(err)
}
// Start the server via goroutine
ns.Start()
return &EmbeddedNATsServer{
NatsServer: ns,
}, nil
}
func (n *EmbeddedNATsServer) Close() error {
if n.NatsServer != nil {
n.NatsServer.Shutdown()
}
return nil
}
func (n *EmbeddedNATsServer) WaitForServer() {
b := backoff.NewExponentialBackOff()
for {
d := b.NextBackOff()
ready := n.NatsServer.ReadyForConnections(d)
if ready {
break
}
log.Printf("NATS server not ready, waited %s, retrying...", d)
}
}
func (n *EmbeddedNATsServer) Client() (*nats.Conn, error) {
return nats.Connect(n.NatsServer.ClientURL())
}
type TypedNewFunc[T protoreflect.ProtoMessage] func() T
type TypedIdFunc[T protoreflect.ProtoMessage] func(T) string
type TypedKV[T proto.Message] struct {
kv nats.KeyValue
newFn TypedNewFunc[T]
getIdFn TypedIdFunc[T]
}
func UpsertTypedKV[T protoreflect.ProtoMessage](js nats.JetStreamContext, cfg *nats.KeyValueConfig, newFn TypedNewFunc[T], idFn TypedIdFunc[T]) (*TypedKV[T], error) {
if cfg == nil || cfg.Bucket == "" {
return nil, fmt.Errorf("invalid config")
}
if idFn == nil {
return nil, fmt.Errorf("invalid idFn")
}
kv, err := js.KeyValue(cfg.Bucket)
if err != nil {
if err != nats.ErrBucketNotFound {
return nil, fmt.Errorf("failed to kv %s: %w", cfg.Bucket, err)
}
kv, err = js.CreateKeyValue(cfg)
if err != nil {
return nil, fmt.Errorf("failed to create kv %s: %w", cfg.Bucket, err)
}
}
tkv := &TypedKV[T]{
kv: kv,
newFn: newFn,
getIdFn: idFn,
}
return tkv, nil
}
func (tkv *TypedKV[T]) Keys() ([]string, error) {
keys, err := tkv.kv.Keys()
if err != nil && err != nats.ErrNoKeysFound {
return nil, err
}
return keys, nil
}
func (tkv *TypedKV[T]) Get(key string) (T, uint64, error) {
entry, err := tkv.kv.Get(key)
if err != nil {
if err == nats.ErrKeyNotFound {
var out T
return out, 0, nil
}
}
out, err := tkv.unmarshal(entry)
if err != nil {
return out, 0, err
}
return out, entry.Revision(), nil
}
func (tkv *TypedKV[T]) unmarshal(entry nats.KeyValueEntry) (T, error) {
if entry == nil {
var out T
return out, nil
}
b := entry.Value()
if b == nil {
var out T
return out, nil
}
t := tkv.newFn()
if err := proto.Unmarshal(b, t); err != nil {
return t, err
}
return t, nil
}
func (tkv *TypedKV[T]) Load(keys ...string) (loaded []T, err error) {
var errs []error
loaded = lop.Map(keys, func(key string, i int) T {
t, _, err := tkv.Get(key)
if err != nil {
errs = append(errs, err)
}
return t
})
if len(errs) > 0 {
return nil, errors.Join(errs...)
}
return loaded, nil
}
func (tkv *TypedKV[T]) All() (out []T, err error) {
keys, err := tkv.kv.Keys()
if err != nil {
return nil, err
}
return tkv.Load(keys...)
}
func (tkv *TypedKV[T]) Set(value T) (revision uint64, err error) {
b, err := proto.Marshal(value)
if err != nil {
return 0, err
}
revision, err = tkv.kv.Put(tkv.getIdFn(value), b)
return
}
func (tkv *TypedKV[T]) Batch(values ...T) (err error) {
errs := lop.Map(values, func(value T, i int) error {
_, err := tkv.Set(value)
return err
})
if len(errs) > 0 {
return errors.Join(errs...)
}
return nil
}
func (tkv *TypedKV[T]) Update(value T, last uint64) (revision uint64, err error) {
b, err := proto.Marshal(value)
if err != nil {
return 0, err
}
key := tkv.getIdFn(value)
revision, err = tkv.kv.Update(key, b, last)
return
}
func (tkv *TypedKV[T]) DeleteKey(key string) (err error) {
return tkv.kv.Delete(key)
}
func (tkv *TypedKV[T]) Delete(value T) (err error) {
return tkv.kv.Delete(tkv.getIdFn(value))
}
func (tkv *TypedKV[T]) watch(ctx context.Context, w nats.KeyWatcher) (values <-chan T, stop func() error, err error) {
ch := make(chan T)
updates := w.Updates()
go func(ctx context.Context, w nats.KeyWatcher) error {
for {
select {
case <-ctx.Done():
return nil
case entry := <-updates:
t, err := tkv.unmarshal(entry)
if err != nil {
return err
}
ch <- t
}
}
}(ctx, w)
return ch, w.Stop, nil
}
func (tkv *TypedKV[T]) Watch(ctx context.Context, key string, opts ...nats.WatchOpt) (values <-chan T, stop func() error, err error) {
w, err := tkv.kv.Watch(key, opts...)
if err != nil {
return nil, nil, fmt.Errorf("failed to watch key %s: %w", key, err)
}
return tkv.watch(ctx, w)
}
func (tkv *TypedKV[T]) WatchAll(ctx context.Context, opts ...nats.WatchOpt) (values <-chan T, stop func() error, err error) {
w, err := tkv.kv.WatchAll(opts...)
if err != nil {
return nil, nil, fmt.Errorf("failed to watch all: %w", err)
}
return tkv.watch(ctx, w)
}
func UpsertStream(js nats.JetStreamContext, cfg *nats.StreamConfig) (si *nats.StreamInfo, err error) {
si, err = js.StreamInfo(cfg.Name)
if err != nil {
if err != nats.ErrStreamNotFound {
return nil, fmt.Errorf("failed to get stream info: %w", err)
}
si, err = js.AddStream(cfg)
if err != nil {
return nil, fmt.Errorf("failed to create stream: %w", err)
}
}
return si, nil
}