Several greenlet subclasses
Project description
Utilities for gevent 1.0.
There’re several gevent.Greenlet subclasses:
Processlet – maximizing multi-core use in gevent environment.
Transparentlet – keeping exc_info rather than printing exception.
And etc.:
ObjectPool – pooling objects. (e.g. connection pool)
See the next examples.
Examples
Processlet for bcrypt
bcrypt is a library to hash password. That the hashing is very heavy CPU-bound task. You can’t guarantee concurrency with only gevent. Use Processlet instead:
import bcrypt
import gevent
from lets import Processlet
# bcrypt.hashpw is very heavy cpu-bound task. it can spend a few seconds.
def hash_password(password, salt=bcrypt.gensalt()):
return bcrypt.hashpw(str(password), salt)
def tictoc(delay=0.1):
while True:
print '.'
gevent.sleep(delay)
passwords = ['alfa', 'bravo', 'charlie', 'delta', 'echo', 'foxtrot',
'golf', 'hotel', 'india', 'juliett', 'kilo', 'lima', 'mike',
'november', 'oscar', 'papa', 'quebec', 'romeo', 'sierra',
'tango', 'uniform', 'victor', 'whiskey', 'xray', 'yankee',
'zulu']
# start tictoc
gevent.spawn(tictoc)
# Greenlet, tictoc pauses for a few seconds
greenlet = gevent.spawn(hash_password, passwords[0])
password_hash_0 = greenlet.get()
# Processlet, tictoc never pauses
processlet_1 = Processlet.spawn(hash_password, passwords[1])
processlet_2 = Processlet.spawn(hash_password, passwords[2])
password_hash_1 = processlet_1.get()
password_hash_2 = processlet_2.get()You can also limit the number of child processes with ProcessPool:
import multiprocessing
from lets import ProcessPool
pool_size = max(multiprocessing.cpu_count() - 1, 1)
pool = ProcessPool(pool_size)
password_hashes = pool.map(hash_password, passwords)Memcached connection pool
Greenlet-safe connection pool can be easily implemented by ObjectPool:
import memcache
from lets import ObjectPool
mc_pool = ObjectPool(10, memcache.Client, [('localhost', 11211)])
def save(key, val):
with mc_pool.reserve() as mc:
mc.set(key, val)
for x, password_hash in enumerate(password_hashes):
gevent.spawn(save, 'password_hashes[%d]' % x, password_hash)
gevent.wait()Links
Release history Release notifications | RSS feed
Download files
Download the file for your platform. If you're not sure which to choose, learn more about installing packages.
Source Distribution
File details
Details for the file lets-0.0.13.tar.gz.
File metadata
- Download URL: lets-0.0.13.tar.gz
- Upload date:
- Size: 7.3 kB
- Tags: Source
- Uploaded using Trusted Publishing? No
File hashes
| Algorithm | Hash digest | |
|---|---|---|
| SHA256 | e9cd8b389b62e83d599d008ee568820becfaba231ef22d22ab0548636618ce6e |
|
| MD5 | 108db68ccf380c12ebdb41508797db40 |
|
| BLAKE2b-256 | 46d280d2e30d6e5d64064a6187c6eab84693854d3f05c38c1b2891f4dc6bc28b |
