Closes #12: Use thread local storage for SeqRepo

Limit number of SeqRepo instances

setup.cfg

@@ -6,9 +6,10 @@ package_dir =
 zip_safe = True
 
 install_requires =
-    biocommons.seqrepo>=0.6.2
+    biocommons.seqrepo~=0.6
     coloredlogs
-    connexion[swagger-ui]>=2.2
+    connexion[swagger-ui]~=2.2
+    Flask~=2.2
 
 [options.extras_require]
 dev =

src/seqrepo_rest_service/threadglobals.py

@@ -3,24 +3,24 @@
 """
 
 import logging
-import os
 
 from biocommons.seqrepo import SeqRepo
-from flask import current_app, g
+from flask import current_app
 
 _logger = logging.getLogger(__name__)
 
 
 def get_seqrepo():
     seqrepo_dir = current_app.config["seqrepo_dir"]
-    _logger.info(f"Opening {seqrepo_dir=}")
+    if _get_or_create("seqrepo", None, False) is None:
+        _logger.info("Opening seqrepo_dir=%s", seqrepo_dir)
     return _get_or_create("seqrepo", lambda: SeqRepo(root_dir=seqrepo_dir))
 
 
-def _get_or_create(k, f):
+def _get_or_create(k, f, create=True):
     k = "_" + k
-    o = getattr(g, k, None)
-    if o is None:
+    o = getattr(_get_or_create, k, None)
+    if o is None and create:
         o = f()
-        setattr(g, k, o)
+        setattr(_get_or_create, k, o)
     return o