@snaxfoundation/snaxjs
v16.0.8
Published
General purpose library for the SNAX blockchain.
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Readme
Snaxjs
General purpose library for SNAX blockchains.
Versions
| SNAX/snaxjs | Npm | SNAX/snax | Docker Hub |
| --- | --- | --- | --- |
| tags: 16.0.0 - 16.0.8 | npm install snaxjs
| tags: v1.1.n - v1.2.4 | snax/snax:v1.2.4 |
Prior version matrix.
Usage
- Install with:
npm install snaxjs
- Html script tag, see releases for the correct version and its matching script integrity hash.
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sha512-zhPSKFEBlDVvUzjl9aBS66cI8tDYoLetynuKvIekHT8NZZ12oxwcZ//M/eT/2Rb/pR/cjFvLD8104Cy//sdEnA== lib/snax.min.js
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<html>
<head>
<meta charset="utf-8">
<script src="https://cdn.jsdelivr.net/npm/[email protected]/lib/snax.min.js"
integrity="sha512-zhPSKFEBlDVvUzjl9aBS66cI8tDYoLetynuKvIekHT8NZZ12oxwcZ//M/eT/2Rb/pR/cjFvLD8104Cy//sdEnA=="
crossorigin="anonymous"></script>
<script>
/** Transactions are only valid on the selected chain. */
chain = {
main: 'aca376f206b8fc25a6ed44dbdc66547c36c6c33e3a119ffbeaef943642f0e906', // main network
jungle: '038f4b0fc8ff18a4f0842a8f0564611f6e96e8535901dd45e43ac8691a1c4dca', // jungle testnet
sys: 'cf057bbfb72640471fd910bcb67639c22df9f92470936cddc1ade0e2f2e7dc4f' // local developer
}
/**
Other httpEndpoint's: https://www.snaxdocs.io/resources/apiendpoints
*/
snax = Snax({
keyProvider: '5KQwrPbwdL6PhXujxW37FSSQZ1JiwsST4cqQzDeyXtP79zkvFD3',// private key
httpEndpoint: 'http://127.0.0.1:8888',
chainId: chain.sys,
});
/**
Sign and broadcast a transaction.
@example updateProducerVote('myaccount', 'proxyaccount', ['respectedbp'])
*/
async function updateProducerVote(voter, proxy = '', producers = []) {
return snax.voteproducer(voter, proxy, producers)
}
</script>
</head>
</html>
Usage
Ways to instantiate snaxjs.
Snax = require('snaxjs')
// Private key or keys (array) provided statically or by way of a function.
// For multiple keys, the get_required_keys API is used (more on that below).
keyProvider: '5KQwrPbwdL6PhXujxW37FSSQZ1JiwsST4cqQzDeyXtP79zkvFD3'
// Localhost Testnet (run ./docker/up.sh)
snax = Snax({keyProvider})
// Connect to a testnet or mainnet
snax = Snax({httpEndpoint, chainId, keyProvider})
// Cold-storage
snax = Snax({httpEndpoint: null, chainId, keyProvider})
// Add support for non-SNAX public key prefixes, such as PUB, etc
snax = Snax({keyPrefix: 'PUB'})
// Read-only instance when 'snaxjs' is already a dependency
snax = Snax.modules.api({/*config*/})
// Read-only instance when an application never needs to write (smaller library)
SnaxApi = require('@snaxfoundation/snaxjs-api')
snax = SnaxApi({/*config*/})
No-arguments prints usage.
snax.getBlock()
USAGE
getBlock - Fetch a block from the blockchain.
PARAMETERS
{
"block_num_or_id": "string"
}
Start a snaxnoded process. The docker in this repository provides a setup that supports the examples in this README.
cd ./docker && ./up.sh
All blockchain functions (read and write) follow this pattern:
// If the last argument is a function it is treated as a callback
snax.getBlock(1, (error, result) => {})
// If a callback is not provided, a Promise is returned
snax.getBlock(1) // @returns {Promise}
// Parameters can be positional or an object
snax.getBlock({block_num_or_id: 1})
// An API with no parameters is invoked with an empty object or callback (avoids logging usage)
snax.getInfo({}) // @returns {Promise}
snax.getInfo((error, result) => { console.log(error, result) })
API Documentation
Chain and history API functions are available after creating the snax
object.
Configuration
Snax = require('snaxjs')
// Default configuration
config = {
chainId: null, // 32 byte (64 char) hex string
keyProvider: ['PrivateKeys...'], // WIF string or array of keys..
httpEndpoint: 'http://127.0.0.1:8888',
expireInSeconds: 60,
broadcast: true,
verbose: false, // API activity
sign: true
}
snax = Snax(config)
chainId
hex
- Unique ID for the blockchain you're connecting to. This is required for valid transaction signing. The chainId is provided via the get_info API call.Identifies a chain by its initial genesis block. All transactions signed will only be valid the blockchain with this chainId. Verify the chainId for security reasons.
keyProvider
[array<string>|string|function]
- Provides private keys used to sign transactions. If multiple private keys are found, the APIget_required_keys
is called to discover which signing keys to use. If a function is provided, this function is called for each transaction.If a keyProvider is not provided here, one may be provided on a per-action or per-transaction basis in Options.
keyPrefix
[string='SNAX']
- Change the public key prefix.httpEndpoint
string
- http or https location of a snaxnoded server providing a chain API. When using snaxjs from a browser remember to configure the same origin policy in snaxnoded or proxy server. For testing, snaxnoded configurationaccess-control-allow-origin = *
could be used.Set this value to null for a cold-storage (no network) configuration.
expireInSeconds
number
- number of seconds before the transaction will expire. The time is based on the snaxnoded's clock. An unexpired transaction that may have had an error is a liability until the expiration is reached, this time should be brief.broadcast
[boolean=true]
- post the transaction to the blockchain. Use false to obtain a fully signed transaction.verbose
[boolean=false]
- verbose logging such as API activity.debug
[boolean=false]
- low level debug logging (serialization).sign
[boolean=true]
- sign the transaction with a private key. Leaving a transaction unsigned avoids the need to provide a private key.mockTransactions (advanced)
mockTransactions: () => null // 'pass', or 'fail'
pass
- do not broadcast, always pretend that the transaction workedfail
- do not broadcast, pretend the transaction failednull|undefined
- broadcast as usual
transactionHeaders (advanced) - manually calculate transaction header. This may be provided so snaxjs does not need to make header related API calls to snaxnode. Used in environments like cold-storage. This callback is called for every transaction. Headers are documented here snaxjs-api#headers.
transactionHeaders: (expireInSeconds, callback) => {callback(null/*error*/, headers)}
logger - default logging configuration.
logger: { log: config.verbose ? console.log : null, // null to disable error: config.verbose ? console.error : null, }
For example, redirect error logs:
config.logger = {error: (...args) => ..}
authorization - replace the default snaxjs authorization on actions. An authorization provided here may still be over-written by specifying an authorization for each individual action.
For example, if most actions in an dapp are based on the posting key, this would replace the default active authorization with a posting authorization:
{authorization: '@posting'}
Options
Options may be provided after parameters.
NOTE: authorization
is for individual actions, it does not belong in Snax(config)
.
options = {
authorization: 'alice@active',
broadcast: true,
sign: true
}
snax.transfer('alice', 'bob', '1.0000 SNAX', '', options)
authorization
[array<auth>|auth]
- identifies the signing account and permission typically in a multisig configuration. Authorization may be a string formatted asaccount@permission
or anobject<{actor: account, permission}>
.- If missing default authorizations will be calculated.
- If provided additional authorizations will not be added.
- Performs deterministic sorting by account name
If a default authorization is calculated the action's 1st field must be an account_name. The account_name in the 1st field gets added as the active key authorization for the action.
broadcast
[boolean=true]
- post the transaction to the blockchain. Use false to obtain a fully signed transaction.sign
[boolean=true]
- sign the transaction with a private key. Leaving a transaction unsigned avoids the need to provide a private key.keyProvider
[array<string>|string|function]
- just like the global keyProvider except this provides a temporary key for a single action or transaction.await snax.anyAction('args', {keyProvider})
await snax.transaction(tr => { tr.anyAction() }, {keyProvider})
Transaction
The transaction function accepts the standard blockchain transaction.
Required transaction header fields will be added unless you are signing without a network connection (httpEndpoint == null). In that case provide you own headers:
// only needed in cold-storage or for offline transactions
const headers = {
expiration: '2018-06-14T18:16:10',
ref_block_num: 1,
ref_block_prefix: 452435776
}
Create and send (broadcast) a transaction:
/** @return {Promise} */
snax.transaction(
{
// ...headers,
// context_free_actions: [],
actions: [
{
account: 'snax.token',
name: 'transfer',
authorization: [{
actor: 'inita',
permission: 'active'
}],
data: {
from: 'inita',
to: 'initb',
quantity: '7.0000 SNAX',
memo: ''
}
}
]
}
// config -- example: {broadcast: false, sign: true}
)
Named action functions
More concise functions are provided for applications that may use actions more frequently. This avoids having lots of JSON in the code.
// Run with no arguments to print usage.
snax.transfer()
// Callback is last, when omitted a promise is returned
snax.transfer('inita', 'initb', '1.0000 SNAX', '', (error, result) => {})
snax.transfer('inita', 'initb', '1.1000 SNAX', '') // @returns {Promise}
// positional parameters
snax.transfer('inita', 'initb', '1.2000 SNAX', '')
// named parameters
snax.transfer({from: 'inita', to: 'initb', quantity: '1.3000 SNAX', memo: ''})
// options appear after parameters
options = {broadcast: true, sign: true}
// `false` is a shortcut for {broadcast: false}
snax.transfer('inita', 'initb', '1.4000 SNAX', '', false)
Read-write API methods and documentation are generated from the snax token and system.
Assets amounts require zero padding. For a better user-experience, if you know the correct precision you may use DecimalPad to add the padding.
DecimalPad = Snax.modules.format.DecimalPad
userInput = '10.2'
precision = 4
assert.equal('10.2000', DecimalPad(userInput, precision))
For more advanced signing, see keyProvider
and signProvider
in
index.test.js.
Shorthand
Shorthand is available for some types such as Asset and Authority. This syntax
is only for concise functions and does not work when providing entire transaction
objects to snax.transaction
..
For example:
- permission
inita
defaultsinita@active
- authority
'SNAX6MRy..'
expands{threshold: 1, keys: [{key: 'SNAX6MRy..', weight: 1}]}
- authority
inita
expands{threshold: 1, accounts: [{permission: {actor: 'inita', permission: 'active'}, weight: 1}]}
New Account
New accounts will likely require some staked tokens for RAM and bandwidth.
wif = '5KQwrPbwdL6PhXujxW37FSSQZ1JiwsST4cqQzDeyXtP79zkvFD3'
pubkey = 'SNAX6MRyAjQq8ud7hVNYcfnVPJqcVpscN5So8BhtHuGYqET5GDW5CV'
snax.transaction(tr => {
tr.newaccount({
creator: 'snax',
name: 'myaccount',
owner: pubkey,
active: pubkey
})
tr.buyrambytes({
payer: 'snax',
receiver: 'myaccount',
bytes: 8192
})
tr.delegatebw({
from: 'snax',
receiver: 'myaccount',
stake_net_quantity: '10.0000 SNAX',
stake_cpu_quantity: '10.0000 SNAX',
transfer: 0
})
})
Contract
Deploy and call smart contracts.
Compile
If you're loading a wasm file, you do not need binaryen. If you're loading a wast file you can include and configure the binaryen compiler, this is used to compile to wasm automatically when calling setcode.
Versions of binaryen may be problematic.
$ npm install [email protected]
binaryen = require('binaryen')
snax = Snax({keyProvider, binaryen})
Deploy
wasm = fs.readFileSync(`docker/contracts/snax.token/snax.token.wasm`)
abi = fs.readFileSync(`docker/contracts/snax.token/snax.token.abi`)
// Publish contract to the blockchain
snax.setcode('myaccount', 0, 0, wasm) // @returns {Promise}
snax.setabi('myaccount', JSON.parse(abi)) // @returns {Promise}
Fetch a smart contract
// @returns {Promise}
snax.contract('myaccount', [options], [callback])
// Run immediately, `myaction` returns a Promise
snax.contract('myaccount').then(myaccount => myaccount.myaction(..))
// Group actions. `transaction` returns a Promise but `myaction` does not
snax.transaction('myaccount', myaccount => { myaccount.myaction(..) })
// Transaction with multiple contracts
snax.transaction(['myaccount', 'myaccount2'], ({myaccount, myaccount2}) => {
myaccount.myaction(..)
myaccount2.myaction(..)
})
Offline or cold-storage contract
snax = Snax({httpEndpoint: null})
abi = fs.readFileSync(`docker/contracts/snax.token/snax.token.abi`)
snax.fc.abiCache.abi('myaccount', JSON.parse(abi))
// Check that the ABI is available (print usage)
snax.contract('myaccount').then(myaccount => myaccount.create())
Offline or cold-storage transaction
// ONLINE
// Prepare headers
expireInSeconds = 60 * 60 // 1 hour
snax = Snax(/* {httpEndpoint: 'https://..'} */)
info = await snax.getInfo({})
chainDate = new Date(info.head_block_time + 'Z')
expiration = new Date(chainDate.getTime() + expireInSeconds * 1000)
expiration = expiration.toISOString().split('.')[0]
block = await snax.getBlock(info.last_irreversible_block_num)
transactionHeaders = {
expiration,
ref_block_num: info.last_irreversible_block_num & 0xFFFF,
ref_block_prefix: block.ref_block_prefix
}
// OFFLINE (bring `transactionHeaders`)
// All keys in keyProvider will sign.
snax = Snax({httpEndpoint: null, chainId, keyProvider, transactionHeaders})
transfer = await snax.transfer('inita', 'initb', '1.0000 SNAX', '')
transferTransaction = transfer.transaction
// ONLINE (bring `transferTransaction`)
snax = Snax(/* {httpEndpoint: 'https://..'} */)
processedTransaction = await snax.pushTransaction(transferTransaction)
// clisnax version:
const clisnaxTransaction = transferTransaction.transaction
clisnaxTransaction.signatures = transferTransaction.signatures
// `cloes push transaction ${JSON.stringify(clisnaxTransaction)}`
Custom Token
// more on the contract / transaction syntax
await snax.transaction('myaccount', myaccount => {
// Create the initial token with its max supply
// const options = {authorization: 'myaccount'} // default
myaccount.create('myaccount', '10000000.000 PHI')//, options)
// Issue some of the max supply for circulation into an arbitrary account
myaccount.issue('myaccount', '10000.000 PHI', 'issue')
})
const balance = await snax.getCurrencyBalance('myaccount', 'myaccount', 'PHI')
console.log('Currency Balance', balance)
Calling Actions
Other ways to use contracts and transactions.
// if either transfer fails, both will fail (1 transaction, 2 messages)
await snax.transaction(snax =>
{
snax.transfer('inita', 'initb', '1.0000 SNAX', ''/*memo*/)
snax.transfer('inita', 'initc', '1.0000 SNAX', ''/*memo*/)
// Returning a promise is optional (but handled as expected)
}
// [options],
// [callback]
)
// transaction on a single contract
await snax.transaction('myaccount', myaccount => {
myaccount.transfer('myaccount', 'inita', '10.000 PHI', '')
})
// mix contracts in the same transaction
await snax.transaction(['myaccount', 'snax.token'], ({myaccount, snax_token}) => {
myaccount.transfer('inita', 'initb', '1.000 PHI', '')
snax_token.transfer('inita', 'initb', '1.0000 SNAX', '')
})
// The contract method does not take an array so must be called once for
// each contract that is needed.
const myaccount = await snax.contract('myaccount')
await myaccount.transfer('myaccount', 'inita', '1.000 PHI', '')
// a transaction to a contract instance can specify multiple actions
await myaccount.transaction(myaccountTr => {
myaccountTr.transfer('inita', 'initb', '1.000 PHI', '')
myaccountTr.transfer('initb', 'inita', '1.000 PHI', '')
})
Development
From time-to-time the snaxjs and snaxnode binary format will change between releases
so you may need to start snaxnode
with the --skip-transaction-signatures
parameter
to get your transactions to pass.
Note, package.json
has a "main" pointing to ./lib
. The ./lib
folder is for
es2015 code built in a separate step. If you're changing and testing code,
import from ./src
instead.
Snax = require('./src')
// forceActionDataHex = false helps transaction readability but may trigger back-end bugs
config = {verbose: true, debug: false, broadcast: true, forceActionDataHex: true, keyProvider}
snax = Snax(config)
Fcbuffer
The snax
instance can provide serialization:
// 'asset' is a type but could be any struct or type like: transaction or uint8
type = {type: 1, data: '00ff'}
buffer = snax.fc.toBuffer('extensions_type', type)
assert.deepEqual(type, snax.fc.fromBuffer('extensions_type', buffer))
// ABI Serialization
snax.contract('snax.token', (error, snax_token) => {
create = {issuer: 'inita', maximum_supply: '1.0000 SNAX'}
buffer = snax_token.fc.toBuffer('create', create)
assert.deepEqual(create, snax_token.fc.fromBuffer('create', buffer))
})
Use Node v10+ for package-lock.json
.
Related Libraries
These libraries are integrated into snaxjs
seamlessly so you probably do not
need to use them directly. They are exported here giving more API access or
in some cases may be used standalone.
var {format, api, ecc, json, Fcbuffer} = Snax.modules
format ./format.md
- Blockchain name validation
- Asset string formatting
- Remote API to an SNAX blockchain node (snaxnode)
- Use this library directly if you need read-only access to the blockchain (don't need to sign transactions).
- Private Key, Public Key, Signature, AES, Encryption / Decryption
- Validate public or private keys
- Encrypt or decrypt with SNAX compatible checksums
- Calculate a shared secret
- Blockchain definitions (api method names, blockchain schema)
- private key storage and key management
- Binary serialization used by the blockchain
- Clients sign the binary form of the transaction
- Allows client to know what it is signing
Environment
Node and browser (es2015)