Add support for KV.txn and add a Lock class

[ducdigital]

• Add support for all compare ops
  • CompareValue
  • CompareLastRevision
  • CompareCreated
  • CompareVersion
• Add support for all success/failure request
  • DeleteRangeRequest
  • RangeRequest
  • PutRequest

Example usage:

  let compareOps = [
    new CompareValue(
      CompareTypeDef.CompareResult.EQUAL,
      new Buffer('key-to-compare'),
      new Buffer('key-to-compare')
    )
  ];
  let successOps = [
    new PutRequest({
      key: new Buffer('put-if-true-key'),
      value: new Buffer('put-if-true-value'),
      lease: 0,
    })
  ];
  let failureOps = [
    new PutRequest({
      key: new Buffer('put-if-fail-key1'),
      value: new Buffer('put-if-fail-value1'),
      lease: 0,
    }),
    new PutRequest({
      key: new Buffer('put-if-fail-key2'),
      value: new Buffer('put-if-fail-value2'),
      lease: 0,
    })
  ];

  etcd.createTransaction(compareOps, successOps, failureOps).then(data => {
    console.log(data);
  });

PS: This is experimental just to kick start the idea. It works but the code is not as clean as the original code base. Might need some refactoring work.

[CitySim]

hi,
thanks for the pull request! 👍
I'll make sure to check it out this week

[ducdigital]

Hey there I just update the Transaction class and add a Lock class. Lock class is "almost" direct implementation of the Python's version.

I also update Transaction class to fix the problem cause by nested proto class object (It does not really work that way and I am not sure why).

As soon as I change everything to a normal object It work very well.