feat(api): server setting to select image format

api/onnx_web/chain/persist_s3.py

@@ -17,7 +17,7 @@ logger = getLogger(__name__)
 
 
 def persist_s3(
-    _ctx: ServerContext,
+    ctx: ServerContext,
     _stage: StageParams,
     _params: ImageParams,
     source_image: Image.Image,
@@ -32,7 +32,7 @@ def persist_s3(
     s3 = session.client('s3', endpoint_url=endpoint_url)
 
     data = BytesIO()
-    source_image.save(data, format='png')
+    source_image.save(data, format=ctx.image_format)
     data.seek(0)
 
     try:

api/onnx_web/output.py

@@ -43,8 +43,8 @@ def json_params(
 
 
 def save_image(ctx: ServerContext, output: str, image: Image.Image) -> str:
-    path = base_join(ctx.output_path, output)
-    image.save(path)
+    path = base_join(ctx.output_path, '%s.%s' % (output, ctx.image_format))
+    image.save(path, format=ctx.image_format)
     return path
 
 

api/onnx_web/utils.py

@@ -29,6 +29,7 @@ class ServerContext:
         num_workers: int = 1,
         block_platforms: List[str] = [],
         default_platform: str = None,
+        image_format: str = 'png',
     ) -> None:
         self.bundle_path = bundle_path
         self.model_path = model_path
@@ -38,6 +39,7 @@ class ServerContext:
         self.num_workers = num_workers
         self.block_platforms = block_platforms
         self.default_platform = default_platform
+        self.image_format = image_format
 
     @classmethod
     def from_environ(cls):
@@ -56,6 +58,9 @@ class ServerContext:
                 'ONNX_WEB_BLOCK_PLATFORMS', '').split(','),
             default_platform=environ.get(
                 'ONNX_WEB_DEFAULT_PLATFORM', None),
+            image_format=environ.get(
+                'ONNX_WEB_IMAGE_FORMAT', 'png'
+            ),
         )
 
 
@@ -155,7 +160,7 @@ def make_output_name(
         for param in extras:
             hash_value(sha, param)
 
-    return '%s_%s_%s_%s.png' % (mode, params.seed, sha.hexdigest(), now)
+    return '%s_%s_%s_%s' % (mode, params.seed, sha.hexdigest(), now)
 
 
 def base_join(base: str, tail: str) -> str: