add in-memory host services for testing

host-services/builtins/objectstore.go

@@ -109,6 +109,8 @@ func (o *ObjectStoreService) HandleRequest(
 	}
 }
 
+// TODO: stop bleeding jetstream ObjectInfo type in the JSON payload
+// and use a more abstract, host-services type
 func (o *ObjectStoreService) handleGet(
 	ctx context.Context,
 	objectStore jetstream.ObjectStore,

host-services/inmem/keyvalue.go

@@ -0,0 +1,118 @@
+package inmem
+
+import (
+	"encoding/json"
+	"log/slog"
+
+	"github.com/nats-io/nats.go"
+	hostservices "github.com/synadia-io/nex/host-services"
+	agentapi "github.com/synadia-io/nex/internal/agent-api"
+)
+
+const kvServiceMethodGet = "get"
+const kvServiceMethodSet = "set"
+const kvServiceMethodDelete = "delete"
+const kvServiceMethodKeys = "keys"
+
+type InmemKeyValue struct {
+	log     *slog.Logger
+	kvstore map[string][]byte
+}
+
+func NewInmemKeyValueService(log *slog.Logger) *InmemKeyValue {
+	return &InmemKeyValue{
+		log:     log,
+		kvstore: make(map[string][]byte),
+	}
+}
+
+func (k *InmemKeyValue) Initialize(_ json.RawMessage) error {
+	return nil
+}
+
+func (k *InmemKeyValue) HandleRequest(
+	conns map[string]*nats.Conn,
+	namespace string,
+	workloadId string,
+	method string,
+	workloadName string,
+	metadata map[string]string,
+	request []byte,
+) (hostservices.ServiceResult, error) {
+
+	switch method {
+	case kvServiceMethodGet:
+		return k.handleGet(metadata)
+	case kvServiceMethodSet:
+		return k.handleSet(request, metadata)
+	case kvServiceMethodDelete:
+		return k.handleDelete(metadata)
+	case kvServiceMethodKeys:
+		return k.handleKeys()
+	default:
+		k.log.Warn("Received invalid host services RPC request",
+			slog.String("service", "kv"),
+			slog.String("method", method),
+		)
+		return hostservices.ServiceResultFail(400, "Received invalid host services RPC request"), nil
+	}
+}
+
+func (k *InmemKeyValue) handleGet(
+	metadata map[string]string,
+) (hostservices.ServiceResult, error) {
+
+	key := metadata[agentapi.KeyValueKeyHeader]
+	if key == "" {
+		return hostservices.ServiceResultFail(400, "key is required"), nil
+	}
+	if val, ok := k.kvstore[key]; ok {
+		return hostservices.ServiceResultPass(200, "", val), nil
+	}
+	return hostservices.ServiceResultFail(404, "no such key"), nil
+}
+
+func (k *InmemKeyValue) handleSet(
+	data []byte,
+	metadata map[string]string,
+) (hostservices.ServiceResult, error) {
+
+	key := metadata[agentapi.KeyValueKeyHeader]
+	if key == "" {
+		return hostservices.ServiceResultFail(400, "key is required"), nil
+	}
+	k.kvstore[key] = data
+	resp, _ := json.Marshal(map[string]interface{}{
+		"revision": 1,
+		"success":  true,
+	})
+	return hostservices.ServiceResultPass(200, "", resp), nil
+}
+
+func (k *InmemKeyValue) handleDelete(
+	metadata map[string]string,
+) (hostservices.ServiceResult, error) {
+
+	key := metadata[agentapi.KeyValueKeyHeader]
+	if key == "" {
+		return hostservices.ServiceResultFail(400, "key is required"), nil
+	}
+
+	delete(k.kvstore, key)
+
+	resp, _ := json.Marshal(map[string]interface{}{
+		"success": true,
+	})
+	return hostservices.ServiceResultPass(200, "", resp), nil
+}
+
+func (k *InmemKeyValue) handleKeys() (hostservices.ServiceResult, error) {
+	keys := make([]string, 0)
+	for key := range k.kvstore {
+		keys = append(keys, key)
+	}
+
+	resp, _ := json.Marshal(keys)
+
+	return hostservices.ServiceResultPass(200, "", resp), nil
+}

host-services/inmem/objectstore.go

@@ -0,0 +1,143 @@
+package inmem
+
+import (
+	"crypto/sha256"
+	"encoding/base64"
+	"encoding/json"
+	"fmt"
+	"log/slog"
+
+	"github.com/nats-io/nats.go"
+	"github.com/nats-io/nats.go/jetstream"
+	hostservices "github.com/synadia-io/nex/host-services"
+	agentapi "github.com/synadia-io/nex/internal/agent-api"
+)
+
+const (
+	objectStoreServiceMethodGet    = "get"
+	objectStoreServiceMethodPut    = "put"
+	objectStoreServiceMethodDelete = "delete"
+	objectStoreServiceMethodList   = "list"
+)
+
+type InmemObjectStore struct {
+	log     *slog.Logger
+	objects map[string][]byte
+}
+
+func NewInmemObjectStore(log *slog.Logger) *InmemObjectStore {
+	return &InmemObjectStore{
+		objects: make(map[string][]byte),
+		log:     log,
+	}
+}
+
+func (o *InmemObjectStore) Initialize(_ json.RawMessage) error {
+	return nil
+}
+
+func (o *InmemObjectStore) HandleRequest(
+	conns map[string]*nats.Conn,
+	namespace string,
+	workloadId string,
+	method string,
+	workloadName string,
+	metadata map[string]string,
+	request []byte) (hostservices.ServiceResult, error) {
+
+	switch method {
+	case objectStoreServiceMethodGet:
+		return o.handleGet(metadata)
+	case objectStoreServiceMethodPut:
+		return o.handlePut(request, metadata)
+	case objectStoreServiceMethodDelete:
+		return o.handleDelete(metadata)
+	case objectStoreServiceMethodList:
+		return o.handleList()
+	default:
+		o.log.Warn("Received invalid host services RPC request",
+			slog.String("service", "objectstore"),
+			slog.String("method", method),
+		)
+		return hostservices.ServiceResultFail(400, "unknown method"), nil
+	}
+}
+
+func (o *InmemObjectStore) handleGet(metadata map[string]string) (hostservices.ServiceResult, error) {
+	name := metadata[agentapi.ObjectStoreObjectNameHeader]
+	if name == "" {
+		return hostservices.ServiceResultFail(400, "name is required"), nil
+	}
+
+	if object, ok := o.objects[name]; ok {
+		return hostservices.ServiceResultPass(200, "", object), nil
+	}
+
+	return hostservices.ServiceResultFail(404, "no such object"), nil
+}
+
+func (o *InmemObjectStore) handlePut(request []byte, metadata map[string]string) (hostservices.ServiceResult, error) {
+	name := metadata[agentapi.ObjectStoreObjectNameHeader]
+	if name == "" {
+		return hostservices.ServiceResultFail(400, "name is required"), nil
+	}
+
+	o.objects[name] = request
+
+	res := jetstream.ObjectInfo{
+		ObjectMeta: jetstream.ObjectMeta{
+			Name:        name,
+			Description: "In-memory object",
+		},
+		Bucket: "bucket",
+		Size:   uint64(len(request)),
+		Digest: makeDigest(request),
+	}
+	output, _ := json.Marshal(res)
+
+	return hostservices.ServiceResultPass(200, "", output), nil
+}
+
+func (o *InmemObjectStore) handleDelete(
+	metadata map[string]string,
+) (hostservices.ServiceResult, error) {
+
+	name := metadata[agentapi.ObjectStoreObjectNameHeader]
+	if name == "" {
+		return hostservices.ServiceResultFail(400, "name is required"), nil
+	}
+
+	delete(o.objects, name)
+
+	resp, _ := json.Marshal(&agentapi.HostServicesObjectStoreResponse{
+		Success: true,
+	})
+	return hostservices.ServiceResultPass(200, "", resp), nil
+}
+
+func (o *InmemObjectStore) handleList() (hostservices.ServiceResult, error) {
+	output := make([]jetstream.ObjectInfo, 0)
+
+	for k, v := range o.objects {
+		output = append(output, jetstream.ObjectInfo{
+			ObjectMeta: jetstream.ObjectMeta{
+				Name:        k,
+				Description: "In-memory object",
+			},
+			Bucket: "bucket",
+			Size:   uint64(len(v)),
+			Digest: makeDigest(v),
+		})
+	}
+	resp, _ := json.Marshal(output)
+	return hostservices.ServiceResultPass(200, "", resp), nil
+}
+
+// NOTE : digest comes back from NATS as a sha-256 hash base64-encoded in the form SHA-256={hash}
+func makeDigest(input []byte) string {
+	s := sha256.New()
+	s.Write(input)
+	hs := s.Sum(nil)
+
+	return fmt.Sprintf("SHA-256=%s", base64.URLEncoding.EncodeToString(hs))
+}

test/inmem_hostservices/main.go

@@ -0,0 +1,46 @@
+package main
+
+import (
+	"context"
+	"log/slog"
+
+	"disorder.dev/shandler"
+	"github.com/nats-io/nats.go"
+	hostservices "github.com/synadia-io/nex/host-services"
+	"github.com/synadia-io/nex/host-services/builtins"
+	"github.com/synadia-io/nex/host-services/inmem"
+	"go.opentelemetry.io/otel"
+	"go.opentelemetry.io/otel/trace/noop"
+)
+
+func main() {
+	ctx, cancel := context.WithCancel(context.Background())
+	defer cancel()
+	nc, err := nats.Connect("0.0.0.0:4222")
+	if err != nil {
+		panic(err)
+	}
+
+	noopProvider := noop.NewTracerProvider()
+	otel.SetTracerProvider(noopProvider)
+	t := otel.Tracer("")
+
+	var handlerOpts []shandler.HandlerOption
+	handlerOpts = append(handlerOpts, shandler.WithLogLevel(slog.LevelDebug))
+	log := slog.New(shandler.NewHandler(handlerOpts...))
+
+	hsServer := hostservices.NewHostServicesServer(nc, log, t)
+	http, _ := builtins.NewHTTPService(log)
+	messaging, _ := builtins.NewMessagingService(log)
+	kv := inmem.NewInmemKeyValueService(log)
+	obj := inmem.NewInmemObjectStore(log)
+
+	_ = hsServer.AddService("http", http, []byte{})
+	_ = hsServer.AddService("messaging", messaging, []byte{})
+	_ = hsServer.AddService("kv", kv, []byte{})
+	_ = hsServer.AddService("objectstore", obj, []byte{})
+
+	_ = hsServer.Start()
+
+	<-ctx.Done()
+}