title | description | date | categories | slug | |
---|---|---|---|---|---|
QQ协议分析 |
QQ协议分析 |
2014-04-16 |
|
qq-protocol |
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//wearversion | |
//wearlog | |
//wearvoiceinputenable | |
//wearvoiceinputdisable | |
//weargoogleapi | |
//assert | |
//pushassert | |
//uplog | |
//upcrash | |
//switchnotificationstatus |
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#! /usr/bin/env python | |
import redis | |
import random | |
import pylibmc | |
import sys | |
r = redis.Redis(host = 'localhost', port = 6389) | |
mc = pylibmc.Client(['localhost:11222']) |
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#!/bin/bash | |
# | |
# chkconfig: 2345 55 25 | |
# description: Openresty | |
# processname: nginx | |
# config: /usr/local/openresty/nginx/conf/nginx.conf | |
# pidfile: /usr/local/openresty/nginx/logs/nginx.pid | |
### BEGIN INIT INFO | |
# Provides: nginx | |
# Required-Start: $local_fs $remote_fs $network $named $syslog $time |
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# Rename tags named foo-bar-#.#.# to v#.#.# and push the tag changes | |
git tag -l | while read t; do n="v${t##*-}"; git tag $n $t; git push --tags ; git tag -d $t; git push origin :refs/tags/$t ; done |
L1 cache reference ......................... 0.5 ns
Branch mispredict ............................ 5 ns
L2 cache reference ........................... 7 ns
Mutex lock/unlock ........................... 25 ns
Main memory reference ...................... 100 ns
Compress 1K bytes with Zippy ............. 3,000 ns = 3 µs
Send 2K bytes over 1 Gbps network ....... 20,000 ns = 20 µs
SSD random read ........................ 150,000 ns = 150 µs
Read 1 MB sequentially from memory ..... 250,000 ns = 250 µs
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// demo_cpu.c | |
#include <stdbool.h> | |
#include <stdint.h> | |
#include <stdio.h> | |
#include <stdlib.h> | |
#define ISROM(a) ((a) < 16) | |
#define ISRAM(a) ((a) >= 16 && (a) < 20) |
The following are examples of the four types rate limiters discussed in the accompanying blog post. In the examples below I've used pseudocode-like Ruby, so if you're unfamiliar with Ruby you should be able to easily translate this approach to other languages. Complete examples in Ruby are also provided later in this gist.
In most cases you'll want all these examples to be classes, but I've used simple functions here to keep the code samples brief.
This uses a basic token bucket algorithm and relies on the fact that Redis scripts execute atomically. No other operations can run between fetching the count and writing the new count.
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create schema shard_1; | |
create sequence shard_1.global_id_sequence; | |
CREATE OR REPLACE FUNCTION shard_1.id_generator(OUT result bigint) AS $$ | |
DECLARE | |
our_epoch bigint := 1314220021721; | |
seq_id bigint; | |
now_millis bigint; | |
-- the id of this DB shard, must be set for each | |
-- schema shard you have - you could pass this as a parameter too |