Simple queue built on top of SQLite
Project description
litequeue
Queue implemented on top of SQLite
Why?
You can use this to implement a persistent queue. It also has extra timing
metrics for the messages/tasks, and the api to set a message as done lets
you specifiy the message_id
to be set as done.
Since it's all based on SQLite / SQL, it is easily extendable.
Messages are always passed as strings, so you can use json data as messages.
Messages are interpreted as tasks, so after you pop
a message, you need to
mark it as done when you finish processing it. When you run the .prune()
method, it will remove all the finished tasks from the database.
Installation
Create a virtual environment if you are alredy not inside one and install the package using pip:
python3 -m venv .venv
python3 -m pip --require-virtualenv install --upgrade litequeue
Quickstart
from litequeue import LiteQueue
q = LiteQueue(":memory:")
q.put("hello")
q.put("world")
# Message object used by LiteQueue
# Message(data='world', message_id=UUID('063e95f1-3d9f-7547-8000-c3eb531fff93'), status=<MessageStatus.READY: 0>, in_time=1676238611851409010, lock_time=None, done_time=None)
task = q.pop()
print(task)
# Message(data='hello', message_id='063e95f1-3d9e-7bbc-8000-a6a18a5f65d1', status=1, in_time=1676238611851279408, lock_time=1676238623180543854, done_time=None)
q.done(task.message_id)
q.get(task.message_id)
# Message(
# data='hello',
# message_id='063e95f1-3d9e-7bbc-8000-a6a18a5f65d1',
# status=2, <---- status is now 2 (DONE)
# in_time=1676238611851279408,
# lock_time=1676238623180543854,
# done_time=1676238641276753673
# )
Check out the docs page for more.
Differences with a normal Python queue.Queue
- Persistence
- Different API to set tasks as done (you tell it which
message_id
to set as done) - Timing metrics. As long as tasks are still in the queue or not pruned, you can see how long they have been there or how long they took to finish.
- Easy to extend using SQL
Examples and bechmarks and bechmarks
You can have a look at the test.py
file. The tests are short and showcase
different usage scenarios.
The benchmark.ipynb
file contains some benchmarks comparing litequeue
to
the built-in Python queue.Queue
.
Multiple queues in the same DB file
In the LiteQueue
class, the filename_or_conn
parameter defines the SQLite
file that will be used to store the messages, the queue_name
parameter is used
to define the table name that will be used to store the messages.
Multiple queues in the same SQLite is supported, but it's neither tested nor
recommended. But if you need it, you can use different queue_name
values when
initializing the LiteQueue
object to store multiple queues in the same DB
file.
import tempfile
import litequeue
with tempfile.TemporaryDirectory() as tmpdirname:
db_path = tmpdirname + "/test.sqlite3"
q1 = litequeue.LiteQueue(db_path, queue_name="q1")
q2 = litequeue.LiteQueue(db_path, queue_name="q2")
q1.put("a")
q1.put("b")
print("Q1 size", q1.qsize())
print("Q2 size", q2.qsize())
q2.put("c")
q2.put("d")
print("Q2 size", q2.qsize())
print(q1.pop())
print(q1.peek())
print(q2.peek())
print(q2.pop())
Meta
Ricardo Ander-Egg Aguilar – @ricardoanderegg –
Distributed under the MIT license. See LICENSE
for more information.
Important changes
- In version 0.6:
- The database schema has changed and the column
message
is nowdata
. - Time is still measured as an integer, but now it's using nanoseconds.
- Messages are represented as a frozen dataclass, not as a dictionary.
- Message IDs are uuidv7 strings.
- The database schema has changed and the column
- In version 0.4 the database schema has changed and the column
task_id
is nowmessage_id
.
Contributing
The only hard rules for the project are:
- No extra dependencies allowed
- No extra files, everything must be inside
litequeue.py
file. - Tests must be inside the
test.py
file. - Files must be formatted using
black
andisort
, using one import per line.
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