Beem: Blockchain.get_transaction / get_transaction_hex issues on appbase nodes

Project Information

• Repository: https://github.com/holgern/beem
• Project Name: Beem
• Publisher: @holger80

A GitHub issue and a PR to fix one aspect of the problem were created. The PO merged the PR and added a fix of the remaining aspect:

• https://github.com/holgern/beem/issues/64
• https://github.com/holgern/beem/pull/65

Expected behavior

Blockchain.get_transaction should return the transaction for a given transaction id. This is for example used by blockchain explorers like steemd to show individual transactions.
Blockchain.get_transaction_hex should return a hexdump of the serialized binary form of a transaction. This function can be used to offload the serialization of a transaction to the RPC node before signing.

Actual behavior

Blockchain.get_transaction and Blockchain.get_transaction_hex fail on appbase nodes with Could not find method get_transaction

How to reproduce

from beem import Steem
from beem.blockchain import Blockchain
trx_id = '6fde0190a97835ea6d9e651293e90c89911f933c'
s = Steem(node=['https://api.steemit.com'])
b = Blockchain(steem_instance=s)
print(b.get_transaction(trx_id))

from beem import Steem
from beem.blockchain import Blockchain
trx = {"ref_block_num":1097,"ref_block_prefix":2181793527,"expiration":"2016-03-24T18:00:21","operations":[{"type":"pow_operation","value":{"worker_account":"cloop3","block_id":"00000449f7860b82b4fbe2f317c670e9f01d6d9a","nonce":3899,"work":{"worker":"STM7P5TDnA87Pj9T4mf6YHrhzjC1KbPZpNxLWCcVcHxNYXakpoT4F","input":"ae8e7c677119d22385f8c48026fee7aad7bba693bf788d7f27047f40b47738c0","signature":"1f38fe9a3f9989f84bd94aa5bbc88beaf09b67f825aa4450cf5105d111149ba6db560b582c7dbb026c7fc9c2eb5051815a72b17f6896ed59d3851d9a0f9883ca7a","work":"000e7b209d58f2e64b36e9bf12b999c6c7af168cc3fc41eb7f8a4bf796c174c3"},"props":{"account_creation_fee":{"amount":"100000","precision":3,"nai":"@@000000021"},"maximum_block_size":131072,"sbd_interest_rate":1000}}}],"extensions":[],"signatures":[]}
s = Steem(node=['https://api.steemit.com'])
b = Blockchain(steem_instance=s)
print(b.get_transaction_hex(trx))

---

The problem with get_transaction_hex() is a typo, the function internally calls get_transaction() instead of get_transaction_hex().

get_transaction() tries to use database_api. However, this method is not part of database_api. According to the documentation, it's only part of condenser_api. Changing the API to "condenser" results in a account_history_api_plugin not enabled Exception. This exception is also thrown with the example in the official documentation.

The PO corrected the API method to account_history. The reason why the call still fails is that the specific node used here doesn't have that plugin enabled. The call will work now on a node with the appropriate plugins enabled.

Environment

# python --version
Python 3.6.6
# beempy --version
beempy, version 0.19.50

GitHub Account

https://github.com/crokkon