Solana: Blockhash not found
Edition with Solana RPC Block Hash Subscription
I encountered a frustrating problem while developing a blockchain application in Solana and would like to share my experience. As a GRPC client developer, I fight the latest block hash from the Solana network using the “blockhash” method.
To get started, dive into the problem:
The problem
When we try to subscribe to the latest block hashra for transactions with GRPC, we find an error when calling the “Blockhash” call. Specifically, the answer is not what we expect. The question is how Solana manages the RPC responses and the method used.
The solution
To solve the problem, we need to understand how the GRPC and the “blockhash” method work on Solanan. Here are the steps I have taken to solve the problem:
- Check documentation : First check that the Solana RPC API documentation firmly seizes the “Blockhash” method.
- Understands the answer structure : The “blockhash” response usually contains information about the latest block hash, including time stamps and other relevant details. It may not be what we expect when using GRPC.
- Use a re -mechanism : In this case, I have found that attempting to resume the “blockhash” call with a delay with a delay can help to solve the problem.
- Check network problems : Sometimes network problems or connection problems can fail RPC requests to fail or return unexpected answers.
Example Code
To illustrate how to approach this issue in the code, here is an example of how to use GRPC with “Blockhash” and re -mechanisms:
`Python
from Solana.rpc.api Import Get_account
Import of Solanarpc.Errors Rpcreror
Def get_latest_block_hash ():
Create session -object
Session = grpc.session ()
Sign up the latest block hashra for transactions
account_id = “your_account_id”
transaction_id = “your_transection_id”
Block_timestamp = 1643723400
def on_block_hash (args, * kwargs):
latest_block_hash = kwargs.get (‘result’)
If the latest_block_hash:
Return latest_block_hash
other:
Print (“Unable to retrieve the latest block hash”)
Create a feature to manage Solana’s response
Def manager (args, * kwargs):
try:
Result = get_account (account_id) .blockhash (block_timestamp)
If Isinstance (Result, Dikt):
Return result [‘latest_block_hash’]
Elif Isinstance (result, bytes):
latest_block_hash = block_from_bytes (result)
Return the latest block hash
Return latest_block_hash.decode (‘UTF-8’)
Except RPCERROR like E:
Print (F “Error: {E}”)
Create a customer object and sign up for the latest block hashra for transactions
Client = grpc.client_session ()
session.subscribe (blockhash = on_block_hash, transaction_id = transaction_id)
Run indefinitely until we successfully scan the latest block hash
Although true:
Result = client.blockhash (session, transaction_id = transaction_id, account_id = account_id)
If Isinstance (Result, Dikt):
Return result [‘latest_block_hash’]
Elif Isinstance (result, bytes):
latest_block_hash = block_from_bytes (result)
Return the latest block hash
Return latest_block_hash.decode (‘UTF-8’)
`
Conclusion
In summary, solving problems with “Blockhash” and Solana’s other GRPC methods requires a solid understanding of RPC API documentation, network connection and a solid understanding of redesign mechanisms.
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