Review Request 44512: Support to get weights info by /weights.

[Yongqiao Wang]

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https://reviews.apache.org/r/44512/
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Review request for mesos and Adam B.


Bugs: MESOS-4316
    https://issues.apache.org/jira/browse/MESOS-4316


Repository: mesos


Description
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Support to get weights info by /weights.


Diffs
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  include/mesos/mesos.proto 3d22ec32655dca741169e1f0e382303e061c38b7 
  src/master/http.cpp a3ad57a1c3f8a01aa609b28c12825670bb243387 
  src/master/master.hpp ea26670e6c6c67314406fded510e8fdd46053dc8 
  src/master/weights_handler.cpp PRE-CREATION 

Diff: https://reviews.apache.org/r/44512/diff/


Testing
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make && make check.

$ (./mesos-master.sh --ip=127.0.0.1 --work_dir=/tmp/mesos-master  
--authenticate_http --credentials=/opt/credentials.json  >> 
/tmp/mesos-master.log 2>&1 &)

$ curl --user framework1:secret_string1 http://localhost:5050/weights | python 
-mjson.tool
{}

$ curl --user framework1:secret_string1 --data 
"[{\"weight\":1.8,\"role\":\"role1\"},{\"weight\":1.0,\"role\":\"role2\"},{\"weight\":3.4,\"role\":\"role3\"}]"
 -X PUT http://127.0.0.1:5050/weights

$ curl --user framework1:secret_string1 http://localhost:5050/weights | python 
-mjson.tool
{
    "infos": [
        {
            "role": "role3",
            "weight": 3.4
        },
        {
            "role": "role2",
            "weight": 1.0
        },
        {
            "role": "role1",
            "weight": 1.8
        }
    ]
}

(TODO) Add couple of tests in another patch.


Thanks,

Yongqiao Wang