@w5/redistream v0.0.64

@w5/redistream

redis stream 用法

Redis stream 教程 Redis 中文文档

1. 创建流和消费组

stream_name = 'img'
group_name = 'get'
# 0 表示从头开始读取
await redis.xgroup('create', stream_name, group_name, 0, 'MKSTREAM')

2. 每个消费者批量认领任务（redis 会确保一个消费者只认领一个任务）

> os > hostname

BLOCK_TIMEOUT = 10 * 60 * 1000 # 10分钟超时

consumer = hostname()

for [_, li] from ( # _ 是 stream name
  await redis.xreadgroup(
    'GROUP', group_name
    consumer
    'COUNT', limit,
    'BLOCK', block_timeout
    'STREAMS',stream_name
    '>'
  ) or []
)
  for [id, msg] from li
    try
      await func(id,msg)
    finnaly
      await redis.xdel stream_name, id

3. 处理长期未 ACK 的 pending（被 xdel 的也会在这个阶段删除）

loop
  [
    _
    li
  ] = await redis.xautoclaim(stream_name, GROUP_NAME, consumer, 1000, '0-0')
  if not li.length
    break
  for [id, msg] from li
    try
      await func(id,msg)
    finnaly
      await redis.xdel stream_name, id

4. 每天清理长期未工作的消费者

for [_,name,_,pending,_,idle] from await redis.xinfo('CONSUMERS', stream_name, GROUP_NAME)
  if pending == 0 and idle > 86400000
    await redis.xgroup('DELCONSUMER',stream_name,GROUP_NAME,name)

test/main.coffee :

#!/usr/bin/env coffee

output :

./out.txt