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index.js
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const
https
=
require
(
"https"
)
const
http
=
require
(
"http"
)
const
net
=
require
(
"net"
)
const
{
hrtime
}
=
process
const
AWS
=
require
(
"aws-sdk"
)
const
cloudwatch
=
new
AWS
.
CloudWatch
(
)
const
hrToMs
=
(
timing
)
=>
Math
.
round
(
timing
[
0
]
*
1000
+
timing
[
1
]
/
1000000
)
const
hrDiff
=
(
start
,
end
)
=>
hrToMs
(
end
)
-
hrToMs
(
start
)
const
timingsDiff
=
(
timings
,
key1
,
key2
)
=>
(
timings
[
key1
]
&&
timings
[
key2
]
&&
hrDiff
(
timings
[
key1
]
,
timings
[
key2
]
)
)
||
-
1
const
defaultTimeout
=
2000
const
processTimings
=
function
(
timings
)
{
return
{
lookup
:
timingsDiff
(
timings
,
"start"
,
"lookup"
)
,
connect
:
timingsDiff
(
timings
,
"lookup"
,
"connect"
)
,
secureConnect
:
timingsDiff
(
timings
,
"connect"
,
"secureConnect"
)
,
readable
:
timingsDiff
(
timings
,
"secureConnect"
,
"readable"
)
||
timingsDiff
(
timings
,
"connect"
,
"readable"
)
,
close
:
timingsDiff
(
timings
,
"readable"
,
"close"
)
,
total
:
timingsDiff
(
timings
,
"start"
,
"close"
)
}
}
const
createRequest
=
function
(
url
,
callback
)
{
const
handler
=
url
.
startsWith
(
"http://"
)
?
http
:
https
return
handler
.
get
(
url
,
callback
)
}
const
sendData
=
(
data
,
event
)
=>
Promise
.
all
(
data
.
reduce
(
(
acc
,
metric
)
=>
{
let
arr
=
acc
[
acc
.
length
-
1
]
if
(
!
arr
||
arr
.
length
>=
10
)
{
acc
.
push
(
[
metric
]
)
}
else
{
arr
.
push
(
metric
)
}
return
acc
}
,
[
]
)
.
map
(
metricData
=>
cloudwatch
.
putMetricData
(
{
Namespace
:
event
.
namespace
||
"Watchtower"
,
MetricData
:
metricData
}
)
.
promise
(
)
)
)
const
handlers
=
{
}
/**
* Query HTTP(S) Endpoints and log timings and HTTP status with CloudWatch
*
*
@param
{
Object
} event - Requested checks
*
@param
{
Object[]
} event.targets - Endpoints to be checked
*
@param
{
string
} [event.targets[].url] - Endpoint URL - use for http(s) endpoints
*
@param
{
string
} [event.targets[].hostname] - Endpoint Hostname - use for non-http(s) endpoints
*
@param
{
string
} [event.targets[].name] - Endpoint Name
*
@param
{
string
} [event.targets[].type] - Check type - can be "http(s)" or "port". Defaults to "http(s)"
*
@param
{
string[]
} [event.logTimings=["readable", "total"]] - Determine which timings are logged.
*
@param
{
string
} [event.namespace="Watchtower"] - CloudWatch namespace
*
@param
{
number
} [event.timeout=2000] - Time in ms before requests are aborted.
*
@param
{
function
} callback - Lambda callback function
*
*
@returns
{
Promise
} - Promise that resolves if all checks were successful and data was stored in CloudWatch
*/
exports
.
handler
=
function
(
event
,
context
,
callback
)
{
const
targets
=
event
.
targets
if
(
!
targets
)
callback
(
"No targets given"
)
const
requests
=
targets
.
map
(
target
=>
new
Promise
(
(
resolve
,
reject
)
=>
{
const
data
=
{
name
:
target
.
name
||
target
.
url
,
timings
:
{
start
:
hrtime
(
)
}
}
switch
(
target
.
type
)
{
case
"smtp"
:
handlers
.
smtp
(
target
,
data
,
event
,
resolve
,
reject
)
break
case
"port"
:
handlers
.
port
(
target
,
data
,
event
,
resolve
,
reject
)
break
default
:
handlers
.
http
(
target
,
data
,
event
,
resolve
,
reject
)
}
}
)
)
return
Promise
.
all
(
requests
)
.
then
(
results
=>
{
const
timestamp
=
new
Date
(
)
const
includedTimings
=
event
.
logTimings
||
[
"readable"
,
"total"
]
const
metricData
=
results
.
map
(
result
=>
{
const
timingMetrics
=
includedTimings
.
map
(
timing
=>
{
return
{
MetricName
:
`timing-
${
timing
}
`
,
Dimensions
:
[
{
Name
:
result
.
name
,
Value
:
`Timing:
${
timing
}
`
}
]
,
Value
:
result
.
durations
[
timing
]
,
Unit
:
"Milliseconds"
,
Timestamp
:
timestamp
}
}
)
return
[
{
MetricName
:
"status"
,
Dimensions
:
[
{
Name
:
result
.
name
,
Value
:
"HTTP Status"
}
]
,
Value
:
result
.
statusCode
,
Timestamp
:
timestamp
}
,
...
timingMetrics
]
}
)
.
reduce
(
(
acc
,
val
)
=>
[
...
acc
,
...
val
]
,
[
]
)
return
sendData
(
metricData
,
event
)
.
then
(
data
=>
{
callback
(
null
,
data
)
}
)
.
catch
(
error
=>
{
callback
(
error
,
null
)
}
)
}
)
.
catch
(
error
=>
{
callback
(
error
)
}
)
}
/*
Check handler for HTTP(S)
*/
handlers
.
http
=
(
target
,
data
,
event
,
resolve
,
reject
)
=>
{
const
request
=
createRequest
(
target
.
url
,
response
=>
{
data
.
statusCode
=
response
.
statusCode
response
.
once
(
"readable"
,
(
)
=>
data
.
timings
.
readable
=
hrtime
(
)
)
response
.
once
(
"end"
,
(
)
=>
data
.
timings
.
end
=
hrtime
(
)
)
}
)
request
.
setTimeout
(
1
)
const
timeout
=
setTimeout
(
(
)
=>
request
.
abort
(
)
,
event
.
timeout
||
defaultTimeout
)
request
.
on
(
"socket"
,
socket
=>
{
socket
.
on
(
"lookup"
,
(
)
=>
data
.
timings
.
lookup
=
hrtime
(
)
)
socket
.
on
(
"connect"
,
(
)
=>
data
.
timings
.
connect
=
hrtime
(
)
)
socket
.
on
(
"secureConnect"
,
(
)
=>
data
.
timings
.
secureConnect
=
hrtime
(
)
)
}
)
request
.
on
(
"close"
,
(
)
=>
{
data
.
timings
.
close
=
hrtime
(
)
data
.
durations
=
processTimings
(
data
.
timings
)
clearTimeout
(
timeout
)
resolve
(
data
)
}
)
request
.
on
(
"error"
,
(
)
=>
{
data
.
timings
.
close
=
hrtime
(
)
data
.
durations
=
processTimings
(
data
.
timings
)
data
.
statusCode
=
typeof
data
.
statusCode
!==
"undefined"
?
data
.
statusCode
:
0
clearTimeout
(
timeout
)
resolve
(
data
)
}
)
}
/*
Check handler for ports
*/
handlers
.
port
=
(
target
,
data
,
event
,
resolve
,
reject
)
=>
{
const
socket
=
new
net
.
Socket
(
)
socket
.
setTimeout
(
event
.
timeout
||
defaultTimeout
)
socket
.
on
(
"connect"
,
(
)
=>
{
data
.
timings
.
connect
=
hrtime
(
)
}
)
socket
.
on
(
"lookup"
,
(
)
=>
{
data
.
timings
.
lookup
=
hrtime
(
)
}
)
socket
.
on
(
"data"
,
(
)
=>
{
data
.
timings
.
readable
=
hrtime
(
)
socket
.
end
(
)
}
)
socket
.
on
(
"end"
,
(
)
=>
{
data
.
timings
.
end
=
hrtime
(
)
}
)
socket
.
on
(
"error"
,
(
)
=>
{
data
.
timings
.
close
=
hrtime
(
)
data
.
durations
=
processTimings
(
data
.
timings
)
data
.
statusCode
=
-
1
socket
.
destroy
(
)
resolve
(
data
)
}
)
socket
.
on
(
"timeout"
,
(
)
=>
{
data
.
timings
.
close
=
hrtime
(
)
data
.
durations
=
processTimings
(
data
.
timings
)
data
.
statusCode
=
-
1
socket
.
destroy
(
)
resolve
(
data
)
}
)
socket
.
on
(
"close"
,
(
)
=>
{
data
.
timings
.
close
=
hrtime
(
)
data
.
durations
=
processTimings
(
data
.
timings
)
data
.
statusCode
=
0
socket
.
destroy
(
)
resolve
(
data
)
}
)
socket
.
connect
(
target
.
port
,
target
.
hostname
,
(
)
=>
{
}
)
}
handlers
.
smtp
=
(
target
,
data
,
event
,
resolve
,
reject
)
=>
{
const
socket
=
new
net
.
Socket
(
)
const
smtpFlags
=
{
}
socket
.
setTimeout
(
event
.
timeout
||
defaultTimeout
)
socket
.
setEncoding
(
"utf8"
)
socket
.
on
(
"connect"
,
(
)
=>
{
data
.
timings
.
connect
=
hrtime
(
)
}
)
socket
.
on
(
"lookup"
,
(
)
=>
{
data
.
timings
.
lookup
=
hrtime
(
)
}
)
socket
.
on
(
"data"
,
(
smtpdata
)
=>
{
if
(
smtpdata
.
match
(
/
^
2
2
0
/
)
&&
smtpFlags
.
greeting
!==
true
)
{
socket
.
write
(
"EHLO lambda-watchtower.test\r\n"
,
"utf8"
)
smtpFlags
.
greeting
=
true
}
else
if
(
smtpdata
.
match
(
/
^
2
5
0
/
)
)
{
data
.
timings
.
readable
=
hrtime
(
)
socket
.
end
(
)
}
}
)
socket
.
on
(
"end"
,
(
)
=>
{
data
.
timings
.
end
=
hrtime
(
)
}
)
socket
.
on
(
"error"
,
(
)
=>
{
data
.
timings
.
close
=
hrtime
(
)
data
.
durations
=
processTimings
(
data
.
timings
)
data
.
statusCode
=
-
1
socket
.
destroy
(
)
resolve
(
data
)
}
)
socket
.
on
(
"timeout"
,
(
)
=>
{
data
.
timings
.
close
=
hrtime
(
)
data
.
durations
=
processTimings
(
data
.
timings
)
data
.
statusCode
=
-
1
socket
.
destroy
(
)
resolve
(
data
)
}
)
socket
.
on
(
"close"
,
(
)
=>
{
data
.
timings
.
close
=
hrtime
(
)
data
.
durations
=
processTimings
(
data
.
timings
)
data
.
statusCode
=
0
socket
.
destroy
(
)
resolve
(
data
)
}
)
socket
.
connect
(
target
.
port
,
target
.
hostname
,
(
)
=>
{
}
)
}
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