mirror of
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53 lines
1.7 KiB
CoffeeScript
53 lines
1.7 KiB
CoffeeScript
_ = require("underscore")
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module.exports = RedisSharelatex =
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createClient: (opts = {port: 6379, host: "localhost"})->
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if opts.password?
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opts.auth_pass = opts.password
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delete opts.password
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if opts.endpoints?
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standardOpts = _.clone(opts)
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delete standardOpts.endpoints
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delete standardOpts.masterName
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client = require("redis-sentinel").createClient opts.endpoints, opts.masterName, standardOpts
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else
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standardOpts = _.clone(opts)
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delete standardOpts.port
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delete standardOpts.host
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client = require("redis").createClient opts.port, opts.host, standardOpts
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return client
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createRobustSubscriptionClient: (opts, heartbeatOpts = {}) ->
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sub = RedisSharelatex.createClient(opts)
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pub = RedisSharelatex.createClient(opts)
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heartbeatInterval = heartbeatOpts.heartbeat_interval or 1000 #ms
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reconnectAfter = heartbeatOpts.reconnect_after or 5000 #ms
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id = require("crypto").createHash("md5").update(Math.random().toString()).digest("hex")
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heartbeatChannel = "heartbeat-#{id}"
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lastHeartbeat = Date.now()
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sub.subscribe heartbeatChannel, (error) ->
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if error?
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console.error "ERROR: failed to subscribe to #{heartbeatChannel} channel", error
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sub.on "message", (channel, message) ->
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if channel == heartbeatChannel
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lastHeartbeat = Date.now()
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reconnectIfInactive = () ->
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timeSinceLastHeartBeat = Date.now() - lastHeartbeat
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if timeSinceLastHeartBeat > reconnectAfter
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console.warn "No heartbeat for #{timeSinceLastHeartBeat}ms, reconnecting"
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sub.connection_gone("no heartbeat for #{timeSinceLastHeartBeat}ms")
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setInterval () ->
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pub.publish heartbeatChannel, "PING"
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reconnectIfInactive()
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, heartbeatInterval
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return sub
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