Websocket to subscribe to many addresses

[canguruhh]

It would be great to be able to subscribe to many addresses to detect new transactions related to specified addresses.

[baaa]

#321 could be helpful

[luozhaohui]

This enhancement will be released on v0.8.3 next month.

1. Subscribe to all addresses:

{"event": "subscribe", "channel": "tx", "address":[]}

or

 {"event": "subscribe", "channel": "tx", "address":""}

2. Subscribe to one address:

{"event": "subscribe", "channel": "tx", "address":["MJNo92g6DavpaCZbYjrH45iQ8eAKnLqmms"]}

or

{"event": "subscribe", "channel": "tx", "address":"MJNo92g6DavpaCZbYjrH45iQ8eAKnLqmms"}

3. Subscribe to many addresses:

{"event": "subscribe", "channel": "tx", "address":["MJNo92g6DavpaCZbYjrH45iQ8eAKnLqmms", "MVk2n7kxKor1DqcxBNLLyXFbexq4kZ3rfp"]}

4. Publish information

Add topic to the publish information. The value of "topic" filed can be "all", a address or a list of addresses.

{
    "channel" : "tx",
    "event" : "publish",
    "result" : 
    {
        "hash" : "d0102c0b5c55398eaca7e75780e4c5f7bdd7d79ca3853dbd5ae7e6120cfe9ad6",
        "height" : 0,
        "inputs" : 
        [
            {
                "address" : "tJNo92g6DavpaCZbYjrH45iQ8eAKnLqmms",
                "previous_output" : 
                {
                    "hash" : "414aab9bbb2b7fdad4b80cf7c83ec97d9714114120107c114c9deb033508cb88",
                    "index" : 1
                },
                "script" : "[ 304402201f1b1a3bf217f609ff993a2213b4ef313feec436f27b589443b3526c41fe12ab02201ed05726d6e968893ac6b798e764ca34e4e597d5311641816c66dfe26af3672901 ] [ 0270ea1252af455e5d1ada1dfda9d47387dd0c483ead95f70e08a6379d03962453 ]",
                "sequence" : 4294967295
            }
        ],
        "lock_time" : "0",
        "outputs" : 
        [
            {
                "address" : "t7cFpPtYDSrR4w873wF2zKjbHgsHBUPnGC",
                "attachment" : 
                {
                    "type" : "etp"
                },
                "index" : 0,
                "locked_height_range" : 0,
                "script" : "dup hash160 [ 077fc0219517c6924ffd89a891a6e035d77db544 ] equalverify checksig",
                "value" : 1234
            },
            {
                "address" : "tJNo92g6DavpaCZbYjrH45iQ8eAKnLqmms",
                "attachment" : 
                {
                    "type" : "etp"
                },
                "index" : 1,
                "locked_height_range" : 0,
                "script" : "dup hash160 [ 7d9d74d3ca1f594f3e45416ca9509f77cd550f39 ] equalverify checksig",
                "value" : 79968766
            }
        ],
        "version" : "4"
    },
    "topic" : 
    [
        "tJNo92g6DavpaCZbYjrH45iQ8eAKnLqmms",
        "t7cFpPtYDSrR4w873wF2zKjbHgsHBUPnGC"
    ]
}

[luozhaohui]

Implemented in v0.8.3 : https://github.com/mvs-org/metaverse/releases/tag/v0.8.3