stellar-base 0.0.5

Code for managing Stellar.org blockchain transactions using stellar-base in python. Allows full functionality interfacing with the Horizon front end.

Python libraries that allow you to interface with the stellar.org horizon interface. Stellar-base library consists of classes to read, write, hash, and sign the xdr structures that are used in stellar-core.

# install
pip install stellar-base

# requirements
ed25519 requires python-dev to be installed
ubuntu/debian:
sudo apt-get install python-dev # for python2.x installs
sudo apt-get install python3-dev # for python3.x installs
yum:
sudo yum install python-devel

[](https://travis-ci.org/StellarCN/py-stellar-base)
# usage

## Create a Stellar keypair?
```python
from stellar_base.keypair import Keypair
kp = Keypair.random()
```
**or**
```python
from __future__ import unicode_literals
master = u'中文'.encode('utf-8')
kp = Keypair.deterministic(master)
```
then we can get key/secret from random:

publickey = kp.address().decode()
secret = kp.seed().decode()


let's start with my favourite keypair in TESTNET.

publickey = 'GDVDKQFP665JAO7A2LSHNLQIUNYNAAIGJ6FYJVMG4DT3YJQQJSRBLQDG'
secret = 'SCVLSUGYEAUC4MVWJORB63JBMY2CEX6ATTJ5MXTENGD3IELUQF4F6HUB'




##Account

### base info
```python
from stellar_base.address import Address
publickey = 'GDVDKQFP665JAO7A2LSHNLQIUNYNAAIGJ6FYJVMG4DT3YJQQJSRBLQDG'
address = Address(address=publickey)
# address = Address(address=publickey,network='public') for livenet.
address.get()
```
now you can check address.`balance` ,`sequence` ,`flags` ,`signers`, `manage_data` etc.

### check payments
`address.payments()`will give you latest 10 payments.

there are three params using for query : `limit`, `order` and `cursor`(paging_token). and the default value for them is 10, asc and 0

so need check payments after a specific cursor?try `address.payments(cursor='4225135422738433',limit=20,order='asc')`

Horizon have SSE support for push data ,if you really want, use like this: `address.payment(sse=True,cursor='4225135422738433')`

###like check payments, you can check `transactions`,`effects`,`offers`,and `operations`.
remember , offers have not SSE support.


## Transaction Builder

### create a Transaction Builder at first

from stellar_base.builder import Builder
builder = Builder(secret=secret)
# builder = Builder(secret=secret, network='public') for LIVENET.

### operations
how about sending Bob a tip?

bob_address = 'GABCDEFGHIJKLMNOPQRSTUVW'
builder.append_payment_op(bob_address,'100','XLM')
or

CNY_ISSUER='GCNYISSUERABCDEFGHIJKLMNOPQ'
builder.append_payment_op(bob_address,'100','CNY',CNY_ISSUER)

### then maybe need carry a message

builder.add_text_memo('Have a nice day!') # string length <= 28 bytes

### sign & submit

builder.sign()
builder.submit()

Done.

### sign a multi-sig transaction

you get a xdr string (or transaction envelope xdr)from a friend or partner ,which describe a multi-sig transaction .
They need you sign on it too.

builder = Builder(secret=secret)
# or builder = Builder(secret=secret, network='public') for LIVENET.
builder.import_from_xdr(xdr_string)
builder.sign()
builder.to_xdr() # generate new xdr string
# or builder.submit() #submit to stellar network



## A payment example without wrapper


from stellar_base.keypair import Keypair
from stellar_base.asset import Asset
from stellar_base.operation import Payment
from stellar_base.transaction import Transaction
from stellar_base.transaction_envelope import TransactionEnvelope as Te
from stellar_base.memo import TextMemo
from stellar_base.horizon import horizon_testnet, horizon_pubic

alice_seed = 'SAZJ3EDATROKTNNN4WZBZPRC34AN5WR43VEHAFKT5D66UEZTKDNKUHOK'
bob_address = 'GDLP3SP4WP72L4BAJWZUDZ6SAYE4NAWILT5WQDS7RWC4XCUNUQDRB2A4'
CNY_ISSUER = 'GDVDKQFP665JAO7A2LSHNLQIUNYNAAIGJ6FYJVMG4DT3YJQQJSRBLQDG'
amount = '100'

Alice = Keypair.from_seed(alice_seed)
horizon = horizon_testnet()

asset = Asset('CNY', CNY_ISSUER)
# create op
op = Payment({
# 'source' : Alice.address().decode(),
'destination': bob_address,
'asset': asset,
'amount': amount
})
# create a memo
msg = TextMemo('Have a nice day!')

# get sequence of Alice
sequence = horizon.account(Alice.address()).get('sequence')

# construct Tx
tx = Transaction(
source=Alice.address().decode(),
opts={
'sequence': sequence,
# 'timeBounds': [],
'memo': msg,
# 'fee': 100,
'operations': [
op,
],
},
)


# build envelope
envelope = Te(tx=tx, opts={"network_id": "TESTNET"})
# sign
envelope.sign(Alice)
# submit
xdr = envelope.xdr()
horizon.submit(xdr)