Quickstart¶

Hive/Steem blockchain¶

Nodes for using beem with the Hive blockchain can be set by the command line tool with:

beempy updatenodes --hive

Nodes for the Hive blockchain are set with

beempy updatenodes

Hive nodes can be set in a python script with

from beem import Hive
from beem.nodelist import NodeList
nodelist = NodeList()
nodelist.update_nodes()
nodes = nodelist.get_hive_nodes()
hive = Hive(node=nodes)
print(hive.is_hive)

Steem nodes can be set in a python script with

from beem import Steem
from beem.nodelist import NodeList
nodelist = NodeList()
nodelist.update_nodes()
nodes = nodelist.get_steem_nodes()
hive = Steem(node=nodes)
print(hive.is_hive)

Hive¶

The hive object is the connection to the Hive blockchain. By creating this object different options can be set.

Note

All init methods of beem classes can be given the blockchain_instance= parameter to assure that all objects use the same steem object. When the blockchain_instance= parameter is not used, the steem object is taken from get_shared_blockchain_instance().

beem.instance.shared_blockchain_instance() returns a global instance of steem. It can be set by beem.instance.set_shared_blockchain_instance() otherwise it is created on the first call.

from beem import Hive
from beem.account import Account
hive = Hive()
account = Account("test", blockchain_instance=hive)

from beem import Hive
from beem.account import Account
from beem.instance import set_shared_blockchain_instance
hive = Hive()
set_shared_blockchain_instance(hive)
account = Account("test")

Wallet and Keys¶

Each account has the following keys:

Posting key (allows accounts to post, vote, edit, resteem and follow/mute)
Active key (allows accounts to transfer, power up/down, voting for witness, …)
Memo key (Can be used to encrypt/decrypt memos)
Owner key (The most important key, should not be used with beem)

Outgoing operation, which will be stored in the steem blockchain, have to be signed by a private key. E.g. Comment or Vote operation need to be signed by the posting key of the author or upvoter. Private keys can be provided to beem temporary or can be stored encrypted in a sql-database (wallet).

Note

Before using the wallet the first time, it has to be created and a password has to set. The wallet content is available to beempy and all python scripts, which have access to the sql database file.

Creating a wallet¶

hive.wallet.wipe(True) is only necessary when there was already an wallet created.

from beem import Hive
hive = Hive()
hive.wallet.wipe(True)
hive.wallet.unlock("wallet-passphrase")

Adding keys to the wallet¶

from beem import Steem
hive = Hive()
hive.wallet.unlock("wallet-passphrase")
hive.wallet.addPrivateKey("xxxxxxx")
hive.wallet.addPrivateKey("xxxxxxx")

Using the keys in the wallet¶

from beem import Hive
hive = Hive()
hive.wallet.unlock("wallet-passphrase")
account = Account("test", blockchain_instance=hive)
account.transfer("<to>", "<amount>", "<asset>", "<memo>")

Private keys can also set temporary¶

from beem import Hive
hive = Hive(keys=["xxxxxxxxx"])
account = Account("test", blockchain_instance=hive)
account.transfer("<to>", "<amount>", "<asset>", "<memo>")

Receiving information about blocks, accounts, votes, comments, market and witness¶

Receive all Blocks from the Blockchain

from beem.blockchain import Blockchain
blockchain = Blockchain()
for op in blockchain.stream():
    print(op)

Access one Block

from beem.block import Block
print(Block(1))

Access an account

from beem.account import Account
account = Account("test")
print(account.balances)
for h in account.history():
    print(h)

A single vote

from beem.vote import Vote
vote = Vote(u"@gtg/ffdhu-gtg-witness-log|gandalf")
print(vote.json())

All votes from an account

from beem.vote import AccountVotes
allVotes = AccountVotes("gtg")

Access a post

from beem.comment import Comment
comment = Comment("@gtg/ffdhu-gtg-witness-log")
print(comment["active_votes"])

Access the market

from beem.market import Market
market = Market("HBD:HIVE")
print(market.ticker())

Access a witness

from beem.witness import Witness
witness = Witness("gtg")
print(witness.is_active)

Sending transaction to the blockchain¶

Sending a Transfer

from beem import Hive
hive = Hive()
hive.wallet.unlock("wallet-passphrase")
account = Account("test", blockchain_instance=hive)
account.transfer("null", 1, "SBD", "test")

Upvote a post

from beem.comment import Comment
from beem import Hive
hive = Hive()
hive.wallet.unlock("wallet-passphrase")
comment = Comment("@gtg/ffdhu-gtg-witness-log", blockchain_instance=hive)
comment.upvote(weight=10, voter="test")

Publish a post to the blockchain

from beem import Hive
hive = Hive()
hive.wallet.unlock("wallet-passphrase")
hive.post("title", "body", author="test", tags=["a", "b", "c", "d", "e"], self_vote=True)

Sell HIVE on the market

from beem.market import Market
from beem import Hive
hive.wallet.unlock("wallet-passphrase")
market = Market("HBD:HIVE", blockchain_instance=hive)
print(market.ticker())
market.hive.wallet.unlock("wallet-passphrase")
print(market.sell(300, 100))  # sell 100 HIVE for 300 HIVE/HBD