Add region to external models

docs/applications/advanced/external-models.md

@@ -17,12 +17,14 @@ $ zip -r model.zip export/estimator
 $ aws s3 cp model.zip s3://your-bucket/model.zip
 ```
 
-3. Specify `model_path` in an API, e.g.
+3. Specify `external_model` in an API, e.g.
 
 ```yaml
 - kind: api
   name: my-api
-  model_path: s3://your-bucket/model.zip
+  external_model:
+    path: s3://your-bucket/model.zip
+    region: us-west-2
   compute:
     replicas: 5
     gpu: 1

docs/applications/resources/apis.md

@@ -8,7 +8,9 @@ Serve models at scale and use them to build smarter applications.
 - kind: api  # (required)
   name: <string>  # API name (required)
   model_name: <string>  # name of a Cortex model (required)
-  model_path: <string>  # path to a zipped model dir (optional)
+  external_model:
+    path: <string>  # path to a zipped model dir (optional)
+    region: <string> # region of external model
   compute:
     replicas: <int>  # number of replicas to launch (default: 1)
     cpu: <string>  # CPU request (default: Null)

examples/external-model/app.yaml

@@ -3,6 +3,8 @@
 
 - kind: api
   name: iris
-  model_path: s3://cortex-examples/iris-model.zip
+  external_model:
+    path: s3://cortex-examples/iris-model.zip
+    region: us-west-2
   compute:
     replicas: 1

pkg/lib/aws/s3.go

@@ -265,7 +265,19 @@ func SplitS3aPath(s3aPath string) (string, string, error) {
 	if !IsValidS3aPath(s3aPath) {
 		return "", "", ErrorInvalidS3aPath(s3aPath)
 	}
-	fullPath := s3aPath[6:]
+	fullPath := s3aPath[len("s3a://"):]
+	slashIndex := strings.Index(fullPath, "/")
+	bucket := fullPath[0:slashIndex]
+	key := fullPath[slashIndex+1:]
+
+	return bucket, key, nil
+}
+
+func SplitS3Path(s3Path string) (string, string, error) {
+	if !IsValidS3Path(s3Path) {
+		return "", "", ErrorInvalidS3aPath(s3Path)
+	}
+	fullPath := s3Path[len("s3://"):]
 	slashIndex := strings.Index(fullPath, "/")
 	bucket := fullPath[0:slashIndex]
 	key := fullPath[slashIndex+1:]
@@ -291,6 +303,27 @@ func IsS3PrefixExternal(bucket string, prefix string, region string) (bool, erro
 	return hasPrefix, nil
 }
 
+func IsS3FileExternal(bucket string, key string, region string) (bool, error) {
+	sess := session.Must(session.NewSession(&aws.Config{
+		Region: aws.String(region),
+	}))
+
+	_, err := s3.New(sess).HeadObject(&s3.HeadObjectInput{
+		Bucket: aws.String(bucket),
+		Key:    aws.String(key),
+	})
+
+	if IsNotFoundErr(err) {
+		return false, nil
+	}
+
+	if err != nil {
+		return false, errors.Wrap(err, key)
+	}
+
+	return true, nil
+}
+
 func IsS3aPrefixExternal(s3aPath string, region string) (bool, error) {
 	bucket, prefix, err := SplitS3aPath(s3aPath)
 	if err != nil {

pkg/operator/api/userconfig/apis.go

@@ -17,6 +17,7 @@ limitations under the License.
 package userconfig
 
 import (
+	"github.com/cortexlabs/cortex/pkg/lib/aws"
 	cr "github.com/cortexlabs/cortex/pkg/lib/configreader"
 	"github.com/cortexlabs/cortex/pkg/lib/errors"
 	"github.com/cortexlabs/cortex/pkg/operator/api/resource"
@@ -26,10 +27,10 @@ type APIs []*API
 
 type API struct {
 	ResourceFields
-	Model     *string     `json:"model" yaml:"model"`
-	ModelPath *string     `json:"model_path" yaml:"model_path"`
-	Compute   *APICompute `json:"compute" yaml:"compute"`
-	Tags      Tags        `json:"tags" yaml:"tags"`
+	Model         *string        `json:"model" yaml:"model"`
+	ExternalModel *ExternalModel `json:"external_model" yaml:"external_model"`
+	Compute       *APICompute    `json:"compute" yaml:"compute"`
+	Tags          Tags           `json:"tags" yaml:"tags"`
 }
 
 var apiValidation = &cr.StructValidation{
@@ -48,17 +49,40 @@ var apiValidation = &cr.StructValidation{
 			},
 		},
 		{
-			StructField: "ModelPath",
-			StringPtrValidation: &cr.StringPtrValidation{
-				Validator: cr.GetS3PathValidator(),
-			},
+			StructField:      "ExternalModel",
+			StructValidation: externalModelFieldValidation,
 		},
 		apiComputeFieldValidation,
 		tagsFieldValidation,
 		typeFieldValidation,
 	},
 }
 
+type ExternalModel struct {
+	Path   string `json:"path" yaml:"path"`
+	Region string `json:"region" yaml:"region"`
+}
+
+var externalModelFieldValidation = &cr.StructValidation{
+	DefaultNil: true,
+	StructFieldValidations: []*cr.StructFieldValidation{
+		{
+			StructField: "Path",
+			StringValidation: &cr.StringValidation{
+				Validator: cr.GetS3PathValidator(),
+				Required:  true,
+			},
+		},
+		{
+			StructField: "Region",
+			StringValidation: &cr.StringValidation{
+				Default:       aws.DefaultS3Region,
+				AllowedValues: aws.S3Regions.Slice(),
+			},
+		},
+	},
+}
+
 func (apis APIs) Validate() error {
 	for _, api := range apis {
 		if err := api.Validate(); err != nil {
@@ -80,12 +104,23 @@ func (apis APIs) Validate() error {
 }
 
 func (api *API) Validate() error {
-	if api.ModelPath == nil && api.Model == nil {
-		return errors.Wrap(ErrorSpecifyOnlyOneMissing("model_name", "model_path"), Identify(api))
+	if api.ExternalModel == nil && api.Model == nil {
+		return errors.Wrap(ErrorSpecifyOnlyOneMissing(ModelKey, ExternalModelKey), Identify(api))
 	}
 
-	if api.ModelPath != nil && api.Model != nil {
-		return errors.Wrap(ErrorSpecifyOnlyOne("model_name", "model_path"), Identify(api))
+	if api.ExternalModel != nil && api.Model != nil {
+		return errors.Wrap(ErrorSpecifyOnlyOne(ModelKey, ExternalModelKey), Identify(api))
+	}
+
+	if api.ExternalModel != nil {
+		bucket, key, err := aws.SplitS3Path(api.ExternalModel.Path)
+		if err != nil {
+			return errors.Wrap(err, Identify(api), ExternalModelKey, PathKey)
+		}
+
+		if ok, err := aws.IsS3FileExternal(bucket, key, api.ExternalModel.Region); err != nil || !ok {
+			return errors.Wrap(ErrorExternalModelNotFound(api.ExternalModel.Path), Identify(api), ExternalModelKey, PathKey)
+		}
 	}
 
 	return nil

pkg/operator/api/userconfig/config_key.go

@@ -93,6 +93,7 @@ const (
 	DatasetComputeKey            = "dataset_compute"
 
 	// API
-	ModelKey     = "model"
-	ModelNameKey = "model_name"
+	ModelKey         = "model"
+	ModelNameKey     = "model_name"
+	ExternalModelKey = "external_model"
 )

pkg/operator/api/userconfig/errors.go

@@ -75,6 +75,7 @@ const (
 	ErrEnvSchemaMismatch
 	ErrExtraResourcesWithExternalAPIs
 	ErrImplDoesNotExist
+	ErrExternalModelNotFound
 )
 
 var errorKinds = []string{
@@ -124,9 +125,10 @@ var errorKinds = []string{
 	"err_env_schema_mismatch",
 	"err_extra_resources_with_external_a_p_is",
 	"err_impl_does_not_exist",
+	"err_external_model_not_found",
 }
 
-var _ = [1]int{}[int(ErrImplDoesNotExist)-(len(errorKinds)-1)] // Ensure list length matches
+var _ = [1]int{}[int(ErrExternalModelNotFound)-(len(errorKinds)-1)] // Ensure list length matches
 
 func (t ErrorKind) String() string {
 	return errorKinds[t]
@@ -575,3 +577,10 @@ func ErrorImplDoesNotExist(path string) error {
 		message: fmt.Sprintf("%s: implementation file does not exist", path),
 	}
 }
+
+func ErrorExternalModelNotFound(path string) error {
+	return Error{
+		Kind:    ErrExternalModelNotFound,
+		message: fmt.Sprintf("%s: file not found or inaccessible", path),
+	}
+}

pkg/operator/context/apis.go

@@ -48,10 +48,11 @@ func getAPIs(config *userconfig.Config,
 			buf.WriteString(model.ID)
 		}
 
-		if apiConfig.ModelPath != nil {
-			modelName = *apiConfig.ModelPath
+		if apiConfig.ExternalModel != nil {
+			modelName = apiConfig.ExternalModel.Path
 			buf.WriteString(datasetVersion)
-			buf.WriteString(*apiConfig.ModelPath)
+			buf.WriteString(apiConfig.ExternalModel.Path)
+			buf.WriteString(apiConfig.ExternalModel.Region)
 		}
 
 		id := hash.Bytes(buf.Bytes())

pkg/workloads/tf_api/api.py

@@ -402,7 +402,7 @@ def start(args):
 
     else:
         if not os.path.isdir(args.model_dir):
-            ctx.storage.download_and_unzip_external(api["model_path"], args.model_dir)
+            ctx.storage.download_and_unzip_external(api["external_model"]["path"], args.model_dir)
 
     channel = grpc.insecure_channel("localhost:" + str(args.tf_serve_port))
     local_cache["stub"] = prediction_service_pb2_grpc.PredictionServiceStub(channel)