Shall getEvent min startLedger depth be equal to earliest accessible ledger entry?

[OlegJakushkin]

What version are you using?

I am using Python on QuickNode REST RPC:

What did you do?

I want to query getEvent REST RPC method. I tried to call on two RPC endpoints:

import requests
import json
import pprint

SOROBAN_RPC_URL ="https://docs-demo.stellar-mainnet.quiknode.pro/" # "https://soroban-rpc.mainnet.stellar.gateway.fm" #"

def get_events(start_ledger, account_id, cursor=None, limit=100):
    payload = {
        "jsonrpc": "2.0",
        "id": 8675399,
        "method": "getEvents",
        "params": {
            "startLedger": start_ledger,
             "filters": [
                {
                    "contractIds": [account_id]
                }
            ],
            "pagination": {
                "limit": limit
            }
        }
    }
    headers = {
        'Content-Type': 'application/json'
    }

    response = requests.post(SOROBAN_RPC_URL, headers=headers, data=json.dumps(payload))
    pprint.pprint(response.json())
    return response.json()


if __name__ == "__main__":
    account_id = "CCO2A7ALFXZ3QIT3SUFJZRWCU5RVWG5E7AI4RCLTRXQIJEFIBEZP63JI"
    start_ledger = 52916217 # fails
                  #52936217 works
    get_events(start_ledger, account_id, None)

Yet it fails with: {'error': {'code': -32600, 'message': 'start is before oldest ledger'}, even though when I ask for the earliest node block, I get: 51379561 which is much less then 52916217:

import requests

HORIZON_URL = "https://docs-demo.stellar-mainnet.quiknode.pro/"  # Use the appropriate URL for your network (testnet/mainnet)

def get_earliest_ledger():
    params = {
        "order": "asc",
        "limit": 1
    }
    response = requests.get(f"{HORIZON_URL}/ledgers", params=params)
    if response.status_code == 200:
        return response.json()['_embedded']['records'][0]
    else:
        response.raise_for_status()

if __name__ == "__main__":
    earliest_ledger = get_earliest_ledger()
    print("Earliest accessible ledger entry:")
    print(earliest_ledger)

prints to me into on 51379561

What did you expect to see?

Events starting from the first block are known to the node.

What did you see instead?

Error {'error': {'code': -32600, 'message': 'start is before oldest ledger'},

Question

Is there some way to get a real minimal queriable node block?

[psheth9]

@OlegJakushkin it seems like you are fetching earliest ledger from Horizon node and not RPC node.

Can you try calling getHealth RPC endpoint instead to see the oldest and latest ledger.

res = requests.post('https://soroban-testnet.stellar.org', json={
    "jsonrpc": "2.0",
    "id": 8675309,
    "method": "getHealth"
})

Response should look like below:

{
    "jsonrpc": "2.0",
    "id": 8675309,
    "result": {
        "status": "healthy",
        "latestLedger": 969486,
        "oldestLedger": 952207,
        "ledgerRetentionWindow": 17280
    }
}