zodburi

Overview

A library which parses URIs and converts them to ZODB storage objects and database arguments.

It will run under CPython 2.6, and 2.7. It will not run under PyPy or Jython. It requires ZODB >= 3.10.0.

Installation

Install using setuptools, e.g. (within a virtualenv):

$ easy_install zodburi

Using

zodburi has exactly one api: zodburi.resolve_uri(). This API obtains a ZODB storage factory and a set of keyword arguments suitable for passing to the ZODB.DB.DB constructor. For example:

from zodburi import resolve_uri

storage_factory, dbkw = resolve_uri(
                  'zeo://localhost:9001?connection_cache_size=20000')

# factory will be an instance of ClientStorageURIResolver
# dbkw will be {'connection_cache_size':20000, 'pool_size':7,
#               'database_name':'unnamed'}

from ZODB.DB import DB
storage = storage_factory()
db = DB(storage, **dbkw)

URI Schemes

The URI schemes currently recognized in the zodbconn.uri setting are file://, zeo://, zconfig://, memory:// . Documentation for these URI scheme syntaxes are below.

In addition to those schemes, the relstorage package adds support for postgres://.

file:// URI scheme

The file:// URI scheme can be passed as zodbconn.uri to create a ZODB FileStorage database factory. The path info section of this scheme should point at a filesystem file path that should contain the filestorage data. For example:

file:///my/absolute/path/to/Data.fs

The URI scheme also accepts query string arguments. The query string arguments honored by this scheme are as follows.

FileStorage constructor related

These arguments generally inform the FileStorage constructor about values of the same names.

create

boolean

read_only

boolean

quota

bytesize

Database-related

These arguments relate to the database (as opposed to storage) settings.

database_name

string

Connection-related

These arguments relate to connections created from the database.

connection_cache_size

integer (default 10000)

connection_pool_size

integer (default 7)

Blob-related

If these arguments exist, they control the blob settings for this storage.

blobstorage_dir

string

blobstorage_layout

string

Misc

demostorage

boolean (if true, wrap FileStorage in a DemoStorage)

Example

An example that combines a path with a query string:

file:///my/Data.fs?connection_cache_size=100&blobstorage_dir=/foo/bar

zeo:// URI scheme

The zeo:// URI scheme can be passed as zodbconn.uri to create a ZODB ClientStorage database factory. Either the host and port parts of this scheme should point at a hostname/portnumber combination e.g.:

zeo://localhost:7899

Or the path part should point at a UNIX socket name:

zeo:///path/to/zeo.sock

The URI scheme also accepts query string arguments. The query string arguments honored by this scheme are as follows.

ClientStorage-constructor related

These arguments generally inform the ClientStorage constructor about values of the same names.

storage

string

cache_size

bytesize

name

string

client

string

debug

boolean

var

string

min_disconnect_poll

integer

max_disconnect_poll

integer

wait

boolean

wait_timeout

integer

read_only

boolean

read_only_fallback

boolean

username

string

password

string

realm

string

blob_dir

string

shared_blob_dir

boolean

Misc

demostorage

boolean (if true, wrap ClientStorage in a DemoStorage)

Connection-related

These arguments relate to connections created from the database.

connection_cache_size

integer (default 10000)

connection_pool_size

integer (default 7)

Database-related

These arguments relate to the database (as opposed to storage) settings.

database_name

string

Example

An example that combines a path with a query string:

zeo://localhost:9001?connection_cache_size=20000

zconfig:// URI scheme

The zconfig:// URI scheme can be passed as zodbconn.uri to create any kind of storage that ZODB can load via ZConfig. The path info section of this scheme should point at a ZConfig file on the filesystem. Use an optional fragment identifier to specify which database to open. This URI scheme does not use query string parameters.

Examples

An example ZConfig file:

<zodb>
  <mappingstorage>
  </mappingstorage>
</zodb>

If that configuration file is located at /etc/myapp/zodb.conf, use the following URI to open the database:

zconfig:///etc/myapp/zodb.conf

A ZConfig file can specify more than one database. For example:

<zodb temp1>
  <mappingstorage>
  </mappingstorage>
</zodb>
<zodb temp2>
  <mappingstorage>
  </mappingstorage>
</zodb>

In that case, use a URI with a fragment identifier:

zconfig:///etc/myapp/zodb.conf#temp1

memory:// URI scheme

The memory:// URI scheme can be passed as zodbconn.uri to create a ZODB MappingStorage (memory-based) database factory. The path info section of this scheme should be a storage name. For example:

memory://storagename

However, the storage name is usually omitted, and the most common form is:

memory://

The URI scheme also accepts query string arguments. The query string arguments honored by this scheme are as follows.

Database-related

These arguments relate to the database (as opposed to storage) settings.

database_name

string

Connection-related

These arguments relate to connections created from the database.

connection_cache_size

integer (default 10000)

connection_pool_size

integer (default 7)

Example

An example that combines a dbname with a query string:

memory://storagename?connection_cache_size=100&database_name=fleeb

More Information

• zodburi API

Reporting Bugs / Development Versions

Visit http://github.com/Pylons/zodburi to download development or tagged versions.

Visit http://github.com/Pylons/zodburi/issues to report bugs.

Indices and tables

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