mirror of
https://github.com/overleaf/overleaf.git
synced 2024-11-21 20:47:08 -05:00
50 lines
1.7 KiB
CoffeeScript
50 lines
1.7 KiB
CoffeeScript
|
metrics = require "metrics-sharelatex"
|
||
|
|
|
||
|
|
os = require "os"
|
||
|
|
HOST = os.hostname()
|
||
|
|
PID = process.pid
|
||
|
|
COUNT = 0
|
||
|
|
|
||
|
|
CHANNEL_MANAGER = {} # hash of event checkers by channel name
|
||
|
|
CHANNEL_ERROR = {} # error status by channel name
|
||
|
|
|
||
|
|
module.exports = class HealthCheckManager
|
||
|
|
# create an instance of this class which checks that an event with a unique
|
||
|
|
# id is received only once within a timeout
|
||
|
|
constructor: (@channel, timeout = 1000) ->
|
||
|
|
# unique event string
|
||
|
|
@id = "host=#{HOST}:pid=#{PID}:count=#{COUNT++}"
|
||
|
|
# count of number of times the event is received
|
||
|
|
@count = 0
|
||
|
|
# after a timeout check the status of the count
|
||
|
|
@handler = setTimeout () =>
|
||
|
|
@setStatus()
|
||
|
|
, timeout
|
||
|
|
# use a timer to record the latency of the channel
|
||
|
|
@timer = new metrics.Timer("event.#{@channel}.latency")
|
||
|
|
# keep a record of these objects to dispatch on
|
||
|
|
CHANNEL_MANAGER[@channel] = @
|
||
|
|
processEvent: (id) ->
|
||
|
|
# if this is our event record it
|
||
|
|
if id == @id
|
||
|
|
@count++
|
||
|
|
@timer?.done()
|
||
|
|
@timer = null # only time the latency of the first event
|
||
|
|
setStatus: () ->
|
||
|
|
# if we saw the event anything other than a single time that is an error
|
||
|
|
error = (@count != 1)
|
||
|
|
CHANNEL_ERROR[@channel] = error
|
||
|
|
|
||
|
|
# class methods
|
||
|
|
@check: (channel, id) ->
|
||
|
|
# dispatch event to manager for channel
|
||
|
|
CHANNEL_MANAGER[channel]?.processEvent id
|
||
|
|
@status: () ->
|
||
|
|
# return status of all channels for logging
|
||
|
|
return CHANNEL_ERROR
|
||
|
|
@isFailing: () ->
|
||
|
|
# check if any channel status is bad
|
||
|
|
for channel, error of CHANNEL_ERROR
|
||
|
|
return true if error is true
|
||
|
|
return false
|