metadata handling fix

src/dexorder/configuration/schema.py

@@ -34,4 +34,4 @@ class Config:
     mirror_source_rpc_url: Optional[str] = None  # source RPC for original pools
     mirror_env: Optional[str] = None
     mirror_pools: list[str] = field(default_factory=list)
-    metadata: Optional[str] = field(default='metadata.json')
+    metadata: Optional[str] = None

src/dexorder/metadata.py

@@ -135,13 +135,18 @@ def get_metadata(addr=None, *, chain_id=None):
         if config.metadata is None or generating_metadata:
             metadata = None
         else:
-            with open(config.metadata) as file:
-                metadata = json.load(file)
-            for chain_id, chain_info in metadata.items():
-                chain_id = int(chain_id)
-                for t in chain_info['t']:
-                    metadata_by_chainaddr[chain_id,t['a']] = t
-                for p in chain_info['p']:
-                    metadata_by_chainaddr[chain_id,p['a']] = p
-            log.info(f'Loaded metadata from {config.metadata}')
+            try:
+                with open(config.metadata) as file:
+                    metadata = json.load(file)
+            except FileNotFoundError:
+                log.warning(f'No metadata file at {config.metadata}')
+                metadata = None
+            else:
+                for chain_id, chain_info in metadata.items():
+                    chain_id = int(chain_id)
+                    for t in chain_info['t']:
+                        metadata_by_chainaddr[chain_id,t['a']] = t
+                    for p in chain_info['p']:
+                        metadata_by_chainaddr[chain_id,p['a']] = p
+                log.info(f'Loaded metadata from {config.metadata}')
     return metadata if addr is None else metadata_by_chainaddr.get((chain_id,addr))