Created
April 2, 2020 08:47
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purescript-redis-client's scanStream implementation
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"use strict"; | |
const Redis = require('ioredis') | |
exports.scanStreamImpl = conn => options => (onError, onSuccess) => { | |
const redis = new Redis(conn.options) | |
var stream = redis.scanStream(options) | |
stream.on("data", resultKeys => { | |
// `resultKeys` is an array of strings representing key names. | |
// Note that resultKeys may contain 0 keys, and that it will sometimes | |
// contain duplicates due to SCAN's implementation in Redis. | |
// woody: Should I check for duplicates here or leave it to end user?? | |
onSuccess(resultKeys) | |
}); | |
stream.on("error", err => { | |
onError(err) | |
}) | |
stream.on("end", () => { | |
redis.disconnect() | |
}) | |
return function (cancelError, cancelerError, cancelerSuccess) { | |
redis.disconnect() | |
cancelerSuccess() | |
} | |
} |
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module Infra.Resources.Database.Redis.Scan (ScanStreamOptions, scanStream) where | |
import Prelude | |
import Data.ByteString (ByteString) | |
import Database.Redis as Redis | |
import Effect.Aff (Aff) | |
import Effect.Aff.Compat (EffectFnAff, fromEffectFnAff) | |
import Prim.Row (class Union) | |
foreign import scanStreamImpl :: forall opts. Redis.Connection -> Record opts -> EffectFnAff (Array ByteString) | |
type ScanStreamOptions | |
= ( count :: Int | |
, match :: String | |
) | |
scanStream :: forall options t. | |
Union options t ScanStreamOptions | |
=> Redis.Connection | |
-> Record options | |
-> Aff (Array ByteString) | |
scanStream redis options = fromEffectFnAff $ scanStreamImpl redis options |
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