getFilterChanges

Polling method for a filter, which returns an array of logs which occurred since last poll.

Filter must be created by calling either eth_newFilter or eth_newBlockFilter.

EXAMPLE

## JSON-RPC over HTTPS POST
curl https://rbc-rpc.com \
    -X POST \
    -H "Content-Type: application/json" \
    -d '{"jsonrpc":"2.0","method":"eth_getFilterChanges","params":["0x10ff0bfbedb01f0dbd4106d14eb719ec38b6eb5b821c"],"id":1}'

## JSON-RPC over WSS
wscat -c ws://rbc-rpc.com
>{"jsonrpc":"2.0","method":"eth_getFilterChanges","params":["0x10ff0bfbedb01f0dbd4106d14eb719ec38b6eb5b821c"],"id":1}

RESPONSE

RESULT FIELDS

• LOG OBJECT ARRAY - Array of log objects, or an empty array if nothing has changed since last poll.

  • For filters created with eth_newBlockFilter the return are block hashes (32 Bytes), e.g. ["0x3454645634534..."].

  • For filters created with eth_newFilter logs are objects with following params:

• removed: true when the log was removed, due to a chain reorganization. false if its a valid log.

• logIndex: integer of the log index position in the block. null when its pending log.

• transactionIndex: integer of the transactions index position log was created from. null when its pending log.

• transactionHash: 32 Bytes - hash of the transactions this log was created from. null when its pending log.

• blockHash: 32 Bytes - hash of the block where this log was in. null when its pending. null when its pending log.

• blockNumber: the block number where this log was in. null when its pending. null when its pending log.

• address: 20 Bytes - address from which this log originated.

• data: DATA - contains the non-indexed arguments of the log.

• topics: Array of DATA - Array of 0 to 4 32 Bytes DATA of indexed log arguments. (In solidity: The first topic is the hash of the signature of the event (e.g. Deposit(address,bytes32,uint256)), except you declared the event with the anonymous specifier.)

BODY

{
    "jsonrpc": "2.0",
    "id": 73,
    "result": [{
        "address": "0xb5a5f22694352c15b00323844ad545abb2b11028",
        "blockHash": "0x99e8663c7b6d8bba3c7627a17d774238eae3e793dee30008debb2699666657de",
        "blockNumber": "0x5d12ab",
        "data": "0x0000000000000000000000000000000000000000000000a247d7a2955b61d000",
        "logIndex": "0x0",
        "removed": false,
        "topics": ["0xddf252ad1be2c89b69c2b068fc378daa952ba7f163c4a11628f55a4df523b3ef", "0x000000000000000000000000bdc0afe57b8e9468aa95396da2ab2063e595f37e", "0x0000000000000000000000007503e090dc2b64a88f034fb45e247cbd82b8741e"],
        "transactionHash": "0xa74c2432c9cf7dbb875a385a2411fd8f13ca9ec12216864b1a1ead3c99de99cd",
        "transactionIndex": "0x3"
    }, {
        "address": "0xe38165c9f6deb144afc9c32c206b024817e1496d",
        "blockHash": "0x99e8663c7b6d8bba3c7627a17d774238eae3e793dee30008debb2699666657de",
        "blockNumber": "0x5d12ab",
        "data": "0x0000000000000000000000000000000000000000000000000000000025c6b720",
        "logIndex": "0x3",
        "removed": false,
        "topics": ["0xddf252ad1be2c89b69c2b068fc378daa952ba7f163c4a11628f55a4df523b3ef", "0x00000000000000000000000080e73e47173b2d00b531bf83bc39e710157125c3", "0x0000000000000000000000008f6cc93795969e5bbbf07c66dfee7d41ad24f1ef"],
        "transactionHash": "0x9e8f1cb1facb9a11a1cf947634053a0b2d557399f926b12127aa10497a2f0153",
        "transactionIndex": "0x5"
    }
}