ethOnBlock

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ethOnBlock
Name: ethOnBlock
ethOnBlock is a stream of changes in the EVM state when a new block is mined. The stream includes the results of eth_call and other RPC requests provided by users and is restricted based on the number of calls. 

This is a Gateway-API only stream.
Options
Key
Description
Values
include
Fields to include in the on block event stream
name, response, blockHeight, tag
[Default: all]
call-params
Fields used to build an RPC call request
method- see chart below for available methods and additional fields required for each method
tag- latest, 0, or negative number. [Default: 0]
name- unique string identifier for call. [Default: integer counter]
Method
Call Documentation
Additional Fields
eth_call
 https://eth.wiki/json-rpc/API#eth_call​
from, to, gas, value, data
eth_getBalance
​https://eth.wiki/json-rpc/API#eth_getbalance​
address
eth_getTransactionCount
​https://eth.wiki/json-rpc/API#eth_gettransactioncount​
address
eth_getCode
​https://eth.wiki/json-rpc/API#eth_getcode​
address
eth_getStorageAt
​https://eth.wiki/json-rpc/API#eth_getstorageat​
address, pos
eth_blockNumber
​https://eth.wiki/json-rpc/API#eth_blocknumber​
None
Examples
Gateway
Cloud-API
ethOnBlock Event
Subscribing to the ethOnBlock stream via the Gateway-API in Python (Line 6 creates the subscription):
import asyncio
from bxcommon.rpc.provider.ws_provider import WsProvider
ws_uri = "ws://127.0.0.1:28333"
async def main():
	async with WsProvider(ws_uri) as ws:
	    subscription_id = await ws.subscribe(
				"ethOnBlock", 
				{"include": ["name", "response", "block_height", "tag"],
				"call-params": [{"name": "my_call_name",
							"to": "0xd46e8dd67c5d32be8058bb8eb970870f07244567",
    							"gas": "0x76c0",
    							"value": "0x9184e72a",
    							"data": "0x00"},
    						{"name": "number",
    							"method": "eth_blockNumber"}]})
	    while True:
	        next_notification = await ws.get_next_subscription_notification_by_id(subscription_id)
	        print(next_notification)  # or process it generally
	    await ws.unsubscribe(subscription_id)
if __name__ == '__main__':
    asyncio.get_event_loop().run_until_complete(main())
​
The ethOnBlock stream is not available via Cloud-API.
TaskCompletedEventis received after all calls have been executed upon receipt of a block.TaskDisabledEvent is received if there is an error response to a call, indicating that the call has been disabled.
Python Gateway:
<<< {'name': 'balance', 'response': {'result': '0x1'}, 'blockHeight': 11654331, 'tag': 11654331}
{'name': 'height', 'response': {'result': '0xb1d4bb'}, 'blockHeight': 11654331, 'tag': 11654331}
{'name': 'TaskDisabledEvent', 'response': {'commandMethod': 'eth_getBalance', 'blockOffset': 0, 'callName': 'balance', 'callPayload': {'address': '0x0000000000000000000000000000000000000000'}, 'active': False}, 'blockHeight': 11654331, 'tag': 11654331}
{'name': 'number', 'response': {'result': '0x0'}, 'blockHeight': 11654331, 'tag': 11654331}
{'name': 'TaskCompletedEvent', 'response': {}, 'blockHeight': 11654331, 'tag': 11654331}}
​
Go Gateway:
<<< {'name': 'balance', 'response': '0x1', 'block_height': 11654331, 'tag': 11654331}
{'name': 'height', 'response': '0xb1d4bb', 'block_height': 11654331, 'tag': 11654331}
{'name': 'TaskDisabledEvent', 'response': '{commandMethod:eth_call blockOffset:0 callName:my_call callPayload:{"data":"0x00","to":"0x0000000000000000000000000000000000000000"} active:false}', 'block_height': '13462626', 'tag': '0xcd6c62'}
{'name': 'number', 'response': '0x0', 'block_height': 11654331, 'tag': 11654331}
{'name': 'TaskCompletedEvent', 'response': '', 'block_height': 11654331, 'tag': 11654331}}
txReceipts
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Last modified 5mo ago
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