[httpjson] Array of objects error - unable to parse out as JSON

[marketadvorackova]

Bug report

Hi,
I've installed and configured httpjson input for telegraf and it works well for single object jsons. Getting a response with an array of objects (multiple measurements), it gives the following error:
ERROR in input [inputs.httpjson]: unable to parse out as JSON, json: cannot unmarshal array into Go value of type map[string]interface {} and I there seems to be no reason. I've copied the new version of the json parser in /plugins/parsers/json. If I'm not missing anything, how come it doesn't work?
Thanks a lot,
Marketa

Relevant telegraf.conf:

Functional input
[[inputs.httpjson]] name = "myapp_systeminfo" interval = "30s" servers = [ "http://test.myapp.company.it/rest/api/2/serverInfo" ] pass = [ "buildNumber", "versionNumbers" ] tag_keys = [ "baseUrl", "version" ] method = "GET" response_timeout = "5s" [inputs.httpjson.headers] Authorization = "Basic AJRtuiW46YNRtaB4=" [inputs.httpjson.parameters] doHealthCheck = "true"

Error giving input

[[inputs.httpjson]] name = "myapp_applicenses" servers = [ "http://test.myapp.company.it/rest/myappmonitor/1.0/applicenses" ] pass = [ "daysLeft" ] tag_keys = [ "application" ] method = "GET" response_timeout = "5s" [inputs.httpjson.headers] Authorization = "Basic AJRtuiW46YNRtaB4="

System info:

Telegraf version 1.1.2
OS Ubuntu 14.04.5 LTS
[Include Telegraf version, operating system name, and other relevant details]

Steps to reproduce:

1. Input server config - call (rest api) responding with an array of objects json

Expected behavior:

Process each object in the array as a single metric.

Actual behavior:

Does nothing, logs an error ERROR in input [inputs.httpjson]: unable to parse out as JSON, json: cannot unmarshal array into Go value of type map[string]interface {}

Additional info:

Functional response (gets processed)
{ "baseUrl":"http://test.myapp.company.it", "version":"7.2.4", "versionNumbers":[ 7, 2, 4 ], "deploymentType":"Server", "buildNumber":72006, "buildDate":"2016-10-31T00:00:00.000+0100", "serverTime":"2016-12-13T17:43:48.952+0100", "scmInfo":"91606a849e49df24789f9d9a6614de45c98c37a8", "serverTitle":"MyAPPtest - MYAPP" }

Non-functional response (logs the error)
[ { "application":"myapp-app1", "daysLeft":126 }, { "application":"myapp-app2", "daysLeft":126 }, { "application":"myapp-app3", "daysLeft":126 } ]

[sparrc]

json arrays will be supported in version 1.2: #1965