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The official Python client library for NSQ
It provides high-level nsq.Reader and nsq.Writer classes for building consumers and producers and two low-level modules for both sync and async communication over the NSQ Protocol (if you wanted to write your own high-level functionality).
The async module is built on top of the Tornado IOLoop and as such requires tornado to be installed.
Contents:
A class representing a message received from nsqd.
If you want to perform asynchronous message processing use the nsq.Message.enable_async() method, pass the message around, and respond using the appropriate instance method.
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Enables asynchronous processing for this message.
nsq.Reader will not automatically respond to the message upon return of message_handler.
Respond to nsqd that you’ve processed this message successfully (or would like to silently discard it).
Returns whether or not this message has been responded to.
Returns whether or not asynchronous processing has been enabled.
Respond to nsqd that you’ve failed to process this message successfully (and would like it to be requeued).
Parameters: |
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Respond to nsqd that you need more time to process the message.
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Starts any instantiated nsq.Reader or nsq.Writer
Reader provides high-level functionality for building robust NSQ consumers in Python on top of the async module.
Reader receives messages over the specified topic/channel and calls message_handler for each message (up to max_tries).
Multiple readers can be instantiated in a single process (to consume from multiple topics/channels at once).
Supports various hooks to modify behavior when heartbeats are received, to temporarily disable the reader, and pre-process/validate messages.
When supplied a list of nsqlookupd addresses, it will periodically poll those addresses to discover new producers of the specified topic.
It maintains a sufficient RDY count based on the # of producers and your configured max_in_flight.
Handlers should be defined as shown in the examples below. The handler receives a nsq.Message object that has instance methods nsq.Message.finish(), nsq.Message.requeue(), and nsq.Message.touch() to respond to nsqd.
It is responsible for sending FIN or REQ commands based on return value of message_handler. When re-queueing, an increasing delay will be calculated automatically.
Additionally, when message processing fails, it will backoff in increasing multiples of requeue_delay between updating of RDY count.
Synchronous example:
import nsq
def handler(message):
print message
return True
r = nsq.Reader(message_handler=handler,
lookupd_http_addresses=['http://127.0.0.1:4161'],
topic="nsq_reader", channel="asdf", lookupd_poll_interval=15)
nsq.run()
Asynchronous example:
import nsq
buf = []
def process_message(message):
global buf
message.enable_async()
# cache the message for later processing
buf.append(message)
if len(buf) >= 3:
for msg in buf:
print msg
msg.finish()
buf = []
else:
print 'deferring processing'
r = nsq.Reader(message_handler=process_message,
lookupd_http_addresses=['http://127.0.0.1:4161'],
topic="nsq_reader", channel="async", max_in_flight=9)
nsq.run()
Parameters: |
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Adds a connection to nsqd at the specified address.
Parameters: |
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Called as part of RDY handling to identify whether this Reader has been disabled
This is useful to subclass and override to examine a file on disk or a key in cache to identify if this reader should pause execution (during a deploy, etc.).
Called when a message has been received where msg.attempts > max_tries
This is useful to subclass and override to perform a task (such as writing to disk, etc.)
Parameters: | message – the nsq.Message received |
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Called whenever a heartbeat has been received
This is useful to subclass and override to perform an action based on liveness (for monitoring, etc.)
Parameters: | conn – the nsq.AsyncConn over which the heartbeat was received |
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Used to identify when buffered messages should be processed and responded to.
When max_in_flight > 1 and you’re batching messages together to perform work is isn’t possible to just compare the len of your list of buffered messages against your configured max_in_flight (because max_in_flight may not be evenly divisible by the number of producers you’re connected to, ie. you might never get that many messages... it’s a max).
Example:
def message_handler(self, nsq_msg, reader):
# buffer messages
if reader.is_starved():
# perform work
reader = nsq.Reader(...)
reader.set_message_handler(functools.partial(message_handler, reader=reader))
nsq.run()
Called when a message is received in order to execute the configured message_handler
This is useful to subclass and override if you want to change how your message handlers are called.
Parameters: | message – the nsq.Message received |
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Trigger a query of the configured nsq_lookupd_http_addresses.
Assigns the callback method to be executed for each message received
Parameters: | message_handler – a callable that takes a single argument |
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In v0.5.0 we dropped support for “tasks” in the nsq.Reader API in favor of a single message handler.
LegacyReader is a backwards compatible API for clients interacting with v0.5.0+ that want to continue to use “tasks”.
Usage:
from nsq import LegacyReader as Reader
Starts any instantiated nsq.Reader or nsq.Writer
A high-level producer class built on top of the Tornado IOLoop supporting async publishing (PUB & MPUB) of messages to nsqd over the TCP protocol.
Example publishing a message repeatedly using a Tornado IOLoop periodic callback:
import nsq
import tornado.ioloop
import time
def pub_message():
writer.pub('test', time.strftime('%H:%M:%S'), finish_pub)
def finish_pub(conn, data):
print data
writer = nsq.Writer(["127.0.0.1:4150"])
tornado.ioloop.PeriodicCallback(pub_message, 1000).start()
nsq.run()
Example publshing a message from a Tornado HTTP request handler:
import functools
import tornado.httpserver
import tornado.ioloop
import tornado.options
import tornado.web
from nsq import Writer, Error
from tornado.options import define, options
class MainHandler(tornado.web.RequestHandler):
@property
def nsq(self):
return self.application.nsq
def get(self):
topic = "log"
msg = "Hello world"
msg_cn = "Hello 世界"
self.nsq.pub(topic, msg) # pub
self.nsq.mpub(topic, [msg, msg_cn]) # mpub
# customize callback
callback = functools.partial(self.finish_pub, topic=topic, msg=msg)
self.nsq.pub(topic, msg, callback=callback)
self.write(msg)
def finish_pub(self, conn, data, topic, msg):
if isinstance(data, Error):
# try to re-pub message again if pub failed
self.nsq.pub(topic, msg)
class Application(tornado.web.Application):
def __init__(self, handlers, **settings):
self.nsq = Writer(["127.0.0.1:4150"])
super(Application, self).__init__(handlers, **settings)
Parameters: |
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