do-with-redis-lock

usage

redisConn = {
  port: 9000,
  host: "...",
  auth: "...",
  db: 1 #optional
}

doWithLock = require("do-with-redis-lock")(redisConn)

action = ->
  request.getAsync(...) # something that returns a Promise

doWithLock(action, key).then (result) ->
  # continue...

If a concurrency problem appears, the Promise is rejected with:

{
  statusCode: 503,
  body: {
    code: "concurrency_conflict",
    message: "Somebody is doing this at the same time at you"
  }
}

migration

1.x users

• In 2.x, the Promise's rejection reason isn't "concurrency_conflict" anymore. See above.

2.x users

• In 3.x, the connection credentials are no longer environment variables. They are passed by parameters instead. See above.