以太坊：事件日志 (Event Logs)

事件日志相关 API，接口的参数说明请参考Etherscan API 约定, 文档中不单独说明。

[Beta] The Event Log API was designed to provide an alternative to the native eth_getLogs. Below are the list of supported filter parameters:

* fromBlock, toBlock, address
* topic0, topic1, topic2, topic3 (32 Bytes per topic)
* topic0_1_opr (and|or between topic0 & topic1), topic1_2_opr (and|or between topic1 & topic2), topic2_3_opr (and|or between topic2 & topic3), topic0_2_opr (and|or between topic0 & topic2), topic0_3_opr (and|or between topic0 & topic3), topic1_3_opr (and|or between topic1 & topic3)

fromBlock and toBlock accepts the blocknumber (integer, NOT hex) or ‘latest’ (earliest & pending is NOT supported yet)
Topic Operator (opr) choices are either ‘and’ or ‘or’ and are restricted to the above choices only
fromBlock and toBlock parameters are required
Either the address and/or topic(X) parameters are required, when multiple topic(X) parameters are used the topicX_X_opr (and|or operator) is also required
For performance & security considerations, only the first 1000 results are return. So please narrow down the filter parameters

Here are some examples of how this filter maybe used:

通过指定区块获取日志

如获取地址为 0x33990122638b9132ca29c723bdf037f1a891a70c 区块从 379224 到最新区块主题 topic[0] = 0xf63780e752c6a54a94fc52715dbc5518a3b4c3c2833d301a204226548a2a8545 的事件日志的方法为：

https://api.etherscan.io/api?module=logs&action=getLogs
&fromBlock=379224
&toBlock=latest
&address=0x33990122638b9132ca29c723bdf037f1a891a70c
&topic0=0xf63780e752c6a54a94fc52715dbc5518a3b4c3c2833d301a204226548a2a8545
&apikey=YourApiKeyToken

通过指定区块获取日志

Get Event Logs from block number 379224 to block 400000 , where log address = 0x33990122638b9132ca29c723bdf037f1a891a70c, topic[0] = 0xf63780e752c6a54a94fc52715dbc5518a3b4c3c2833d301a204226548a2a8545 ‘AND’ topic[1] = 0x72657075746174696f6e00000000000000000000000000000000000000000000

https://api.etherscan.io/api?module=logs&action=getLogs
&fromBlock=379224
&toBlock=400000
&address=0x33990122638b9132ca29c723bdf037f1a891a70c
&topic0=0xf63780e752c6a54a94fc52715dbc5518a3b4c3c2833d301a204226548a2a8545
&topic0_1_opr=and
&topic1=0x72657075746174696f6e00000000000000000000000000000000000000000000
&apikey=YourApiKeyToken