arweave-python-client
This client allows you to integrate your python apps with the Arweave network allowing you to got wallet operations and transactions
Installing
To use the library simply install it:
pip install arweave-python-client
Using your wallet
Once installed you can import it and supply the wallet object with the path to your wallet JSON file:
import arweave
wallet_file_path = "/some/folder/on/your/system"
wallet = arweave.Wallet(wallet_file_path)
balance = wallet.balance
last_transaction = wallet.get_last_transaction_id()
Loading your wallet
If your wallet data is stored in a secret manager or anywhere other than a file, you can load it with the from_data classmethod:
import arweave
wallet_data = // Load from cloud storage or wherever
wallet = arweave.Wallet.from_data(wallet_data)
balance = wallet.balance
Transactions
To send a transaction you will need to open your wallet, create a transaction object, sign the transaction and then finally post the transaction:
import arweave
wallet_file_path = "/some/folder/on/your/system"
wallet = arweave.Wallet(wallet_file_path)
transaction = arweave.Transaction(wallet, quantity=0.3, to='<some wallet address')
transaction.sign()
transaction.send()
#####ATTENTION! quantity is in AR and is automatically converted to Winston before sending
Uploading large files
Uploading large data files is now possible! you can now upload data larger than your physical memory or maximum transaction size (12MB) in the following way
from arweave.arweave_lib import Wallet, Transaction
from arweave.transaction_uploader import get_uploader
wallet = Wallet(jwk_file)
with open("my_mahoosive_file.dat", "rb", buffering=0) as file_handler:
tx = Transaction(wallet, file_handler=file_handler, file_path="/some/path/my_mahoosive_file.dat")
tx.add_tag('Content-Type', 'application/dat')
tx.sign()
uploader = get_uploader(tx, file_handler)
while not uploader.is_complete:
uploader.upload_chunk()
logger.info("{}% complete, {}/{}".format(
uploader.pct_complete, uploader.uploaded_chunks, uploader.total_chunks
))
NOTE: When uploading you only need to supply a file handle with buffering=0 instead of reading in the data all at once. The data will be read progressively in small chunks
To check the status of a transaction after sending:
status = transaction.get_status()
To check the status much later you can store the transaction.id and reload it:
transaction = Transaction(wallet, id='some id you stored')
status = transaction.get_status()
Storing data
As you know Arweave allows you to permanently store data on the network and you can do this by supplying data to the transaction as a string object:
wallet = Wallet(jwk_file)
with open('myfile.pdf', 'r') as mypdf:
pdf_string_data = mypdf.read()
transaction = Transaction(wallet, data=pdf_string_data)
transaction.sign()
transaction.send()
Retrieving transactions/data
To get the information about a transaction you can create a transaction object with the ID of that transaction:
tx = Transaction(wallet, id=<your tx id>)
tx.get_transaction()
In addition you may want to get the data attached to this transaction once you've decided you need it:
tx.get_data()
print(tx.data)
> "some data"
Sending to a specific Node
You can specify a specific node by setting the api_url of the wallet/transaction object:
wallet = Wallet(jwk_file)
wallet.api_url = 'some specific node ip/address and port'
Or
transaction = Transaction(wallet, data=pdf_string_data)
transaction.api_url = 'some specific node ip/address and port'
Arql
You can now perform searches using the arql method:
from arweave.arweave_lib import arql
wallet_file_path = "/some/folder/on/your/system"
wallet = arweave.Wallet(wallet_file_path)
transaction_ids = arql(
wallet,
{
"op": "equals",
"expr1": "from",
"expr2": "Some owner address"
})
Alternatively, you can use a the helper method arql_with_transaction_data() to get all transaction ids as well as all the data stored in the blockchain
import arweave
wallet_file_path = "/some/folder/on/your/system"
wallet = arweave.Wallet(wallet_file_path)
transactions = aweave.arql_with_transaction_data(
wallet,
{
"op": "equals",
"expr1": "from",
"expr2": "Some owner address"
})