added zeo_db

.gitignore

@@ -1,2 +1,63 @@
-/.project
-/.pydevproject
+# eclipse
+.project
+.pydevproject
+
+# Byte-compiled / optimized / DLL files
+__pycache__/
+*.py[cod]
+*$py.class
+
+# C extensions
+*.so
+
+# Distribution / packaging
+.Python
+build/
+develop-eggs/
+dist/
+downloads/
+eggs/
+.eggs/
+lib/
+lib64/
+parts/
+sdist/
+var/
+wheels/
+share/python-wheels/
+*.egg-info/
+.installed.cfg
+*.egg
+MANIFEST
+
+# PyInstaller
+#  Usually these files are written by a python script from a template
+#  before PyInstaller builds the exe, so as to inject date/other infos into it.
+*.manifest
+*.spec
+
+# Installer logs
+pip-log.txt
+pip-delete-this-directory.txt
+
+# Flask stuff:
+instance/
+.webassets-cache
+
+# Sphinx documentation
+docs/_build/
+
+# Jupyter Notebook
+.ipynb_checkpoints
+
+# PEP 582; used by e.g. github.com/David-OConnor/pyflow
+__pypackages__/
+
+# Environments
+.env
+.venv
+env/
+venv/
+ENV/
+env.bak/
+venv.bak/

.settings/org.eclipse.core.resources.prefs

@@ -0,0 +1,2 @@
+eclipse.preferences.version=1
+encoding//src/webui/flaskr/zcm.py=utf8

src/webui/Dockerfile

@@ -1,9 +1,7 @@
 FROM python:3.9-slim
-RUN apt-get update && apt-get install -y \
-    gcc  \
-    && rm -rf /var/lib/apt/lists/*
-RUN pip install flask==5.6.0
-ADD ./run.sh /run.sh
-RUN chmod +x /run.sh
+RUN pip install flask
+COPY flaskr flaskr
+COPY run.sh run.sh
+ENV  FLASK_APP=flaskr/zeo_db.py
 EXPOSE 5000
 CMD /run.sh

src/webui/flaskr/redis_db.py

@@ -0,0 +1,26 @@
+import time
+
+from flask import Flask
+import redis
+
+
+app = Flask(__name__)
+cache = redis.Redis(host='redis', port=6379)
+
+
+def get_hit_count():
+    retries = 5
+    while True:
+        try:
+            return cache.incr('hits')
+        except redis.exceptions.ConnectionError as exc:
+            if retries == 0:
+                raise exc
+            retries -= 1
+            time.sleep(0.5)
+
+
+@app.route('/')
+def hello():
+    count = get_hit_count()
+    return 'Hello World! I have been seen {} times.\n'.format(count)

src/webui/flaskr/zcm.py

@@ -0,0 +1,94 @@
+# Copyright (c) 2016 Andreas
+# See LICENSE for details.
+
+""" ZODB context manager """
+
+# from BTrees.IOBTree import IOBTree
+# from BTrees.OOBTree import OOBTree
+# from persistent import Persistent
+# from persistent.list import PersistentList as PList
+# from persistent.mapping import PersistentMapping as PDict
+
+from ZEO.ClientStorage import ClientStorage
+from ZODB import DB
+from ZODB.FileStorage import FileStorage
+
+
+class ZDatabase():
+    """ Provides a ZODB database context manager """
+
+    def __init__(self, uri, **kwargs):
+        self.storage = create_storage(uri)
+        self.db = DB(self.storage, **kwargs)
+
+    def __enter__(self):
+        return self.db
+
+    def __exit__(self, exc_type, exc_value, traceback):
+        self.db.close()
+        return False
+
+
+class ZConnection():
+    """ Provides a ZODB connection with auto-abort (default).
+    Provides a tuple of connection and root object:
+        with ZConnection(db) as (cx, root):
+            root.one = "ok"
+    ZConnection implements a connection context manager.
+    Transaction context managers in contrast do auto-commit:
+        a) with db.transaction() as connection, or
+        b) with cx.transaction_manager as transaction, or
+        c) with transaction.manager as transaction  (for the thread-local transaction manager)
+    See also http://www.zodb.org/en/latest/guide/transactions-and-threading.html
+    """
+    def __init__(self, db, auto_commit=False, transaction_manager=None):
+        self.db = db
+        self.auto_commit = auto_commit
+        self.transaction_manager = transaction_manager
+        self.cx = None
+
+    def __enter__(self):
+        if self.transaction_manager:
+            self.cx = self.db.open(self.transaction_manager)
+        else:
+            self.cx = self.db.open()
+        return self.cx, self.cx.root()
+
+    def __exit__(self, exc_type, exc_value, traceback):
+        if self.auto_commit:
+            self.cx.transaction_manager.commit()
+        self.cx.close()
+        return False
+
+
+def create_storage(uri):
+    """ supported URIs
+    file://e:/workspaces/zeo/bots.fs
+    zeo://localhost:8001
+    e:/workspaces/zeo/bots.fs
+    @see https://en.wikipedia.org/wiki/Uniform_Resource_Identifier
+    """
+    if uri.startswith("file://"):
+        storage = FileStorage(uri[7:])
+    elif uri.startswith("zeo://"):
+        addr, port = uri[6:].split(":")
+        # addr_ = addr.encode("ASCII")
+        storage = ClientStorage((addr, int(port)))
+    else:
+        storage = FileStorage(uri)
+    return storage
+
+
+def database(uri):
+    """ convenience function for single thread, return one connection from the pool """
+    storage = create_storage(uri)
+    db = DB(storage)
+    return db
+
+
+def connection(db):
+    """ Convenience function for multi thread, returns
+    connection, transaction manager and root
+    """
+    cx = db.open()
+    return cx, cx.root()

src/webui/flaskr/zeo_db.py

@@ -0,0 +1,25 @@
+from ZEO.ClientStorage import ClientStorage
+from ZODB import DB
+from flask import Flask
+
+
+app = Flask(__name__)
+storage = ClientStorage(("127.0.0.1", 8100))
+db = DB(storage)
+cx = db.open()
+
+
+def get_hit_count():
+    root = cx.root()
+    if "hits" not in root:
+        root['hits'] = 0
+    hits = root['hits']
+    root['hits'] = hits + 1
+    cx.transaction_manager.commit()
+    return hits
+
+
+@app.route('/')
+def hello():
+    count = get_hit_count()
+    return 'Hello World! I have been seen {} times.\n'.format(count)

src/webui/run.sh

@@ -1,9 +1,3 @@
 #!/bin/sh
 
-# We need to add a empty Data.fs if it does not exist
-# as zeo will not start without on.
-if [ ! -f /var/zeo/fs/Data.fs ]; then
-    touch /var/zeo/fs/Data.fs
-fi
-
-exec /usr/local/bin/runzeo -a 8100 -C /etc/zeo.conf
+exec python3 -m flask run --host=0.0.0.0

src/zeo/Dockerfile

@@ -4,8 +4,8 @@ RUN apt-get update && apt-get install -y \
     && rm -rf /var/lib/apt/lists/*
 RUN pip install ZODB==5.6.0
 RUN pip install ZEO==5.2.1
-ADD ./zeo.conf /etc/zeo.conf
-ADD ./run.sh /run.sh
+COPY ./zeo.conf /etc/zeo.conf
+COPY ./run.sh /run.sh
 RUN chmod +x /run.sh
 VOLUME ["/var/zeo/fs", "/var/zeo/blobs"]
 EXPOSE 8100