@dispatchlabs/dispatch-js

The Dispatch SDK for Node and JavaScript developers.

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Install

Install with npm:

$ npm install --save @dispatchlabs/dispatch-js

CDN

The JavaScript version of the SDK may be included on the pae with the following CDN location:

<script src="https://cdn.jsdelivr.net/npm/@dispatchlabs/dispatch-js/dist/dispatch.js"></script>

Migrating from disnode_sdk

If you are moving from our previous SDK (disnode_sdk) to this version you will need to replace all occurrences of DisNodeSDK and/or DisJS to Dispatch.

Usage

Node:

var Dispatch = require('@dispatchlabs/dispatch-js');
// or
import Dispatch from '@dispatchlabs/dispatch-js';

JavaScript:

For JavaScript, the top-level object is Dispatch.

Running examples

Examples are contained in the examples folder and can be executed in Node using:

$ npm install && npm run examples

To execute the JavaScript examples, open the examples/js/index.html file in a browser window.

Changing the network the SDK talks to

In node_modules/@dispatchlabs/dispatch-js/lib/config.json you will see the various environments. Use development for building and testing,

To change the environment set NODE_ENV:

$ NODE_ENV=development node myScript.js

By default the SDK talks to the production network.

Models

Account

constructor

Account constructor. Create an instance of an account, which can then be used to interact with the network.

• returns {Object}: instance of Account

Examples

// Create an empty account
let account = new Dispatch.Account();
account.init();

// Create an account using a known address
let account = new Dispatch.Account('fa61c18114f8ff8aafbeb5d32e1b108e3f6cf30d');

// Create an account using a private key (the address and public key will be filled in automatically)
let account = new Dispatch.Account({
 name: 'MyAccount',
 privateKey: '472ba91402425b58a2eebf932812f20c6d7f6297bba1f83d9a58116ae6512d9e'
});

refresh

Refreshes the account balance and access info (created and updated dates) from a delegate.

• returns {Promise}: Promise that will return the result of the Delegate request after updating account object.

Example

let account = new Dispatch.Account('fa61c18114f8ff8aafbeb5d32e1b108e3f6cf30d');
account.refresh()
  .then(() => {
    console.log(account);
  })
  .catch((err) => {
    console.error(err);
  });

init

Generaes a new private key for the account object (replacing one if present).

• returns {Account}: Returns the account object for use in chaining.

Example

let account = new Dispatch.Account();
account.init();
console.log(account);

sendTokens

Creates and sends a transaction that will transfer tokens from the source account, to the target account.

Params

• {string|Account}: to - The address or Account to send the tokens to.
• {number}: The number of Divitos to send. 1 Divvy = 100,000,000 Divitos
• returns {Transaction}: Returns a transaction which has already been sent.

Example

let account = new Dispatch.Account({
 name: 'MyAccount',
 privateKey: '472ba91402425b58a2eebf932812f20c6d7f6297bba1f83d9a58116ae6512d9e'
});
// Send one (1) token
let tx = account.sendTokens(new Dispatch.Account().init(), 1);

// Or - to send to an address without making an account
let tx = account.sendTokens("dbf2bb4792c1ae1338b1cdc55a9f68e0e62c0fb8", 1);

createContract

Creates and sends a transaction from the account that will create a new Smart Contract.

Params

• {string}: code - Bytecode of a compiled contract.
• {string|array}: code - The ABI of the contract.
• returns {Transaction}: Returns a transaction which has already been sent.

Example

let account = new Dispatch.Account({
 name: 'MyAccount',
 privateKey: '472ba91402425b58a2eebf932812f20c6d7f6297bba1f83d9a58116ae6512d9e'
});
let compiled = Dispatch.Transaction.compileSource('contract x { function g() { } }');
let contract = account.createContract(compiled.contracts[0].bytecode, compiled.contracts[0].abi);

executeRead

Calls a Smart-Contract from the account that will emulate executing a method and return the result without costing hertz or writing a transaction to the ledger.

Params

• {string|Account|Transaction}: to - The address of an existing contract, an Account representing the contract, or the contract creation Transaction.
• {string}: method - The method in the contract to call.
• {array}: params - The parameters to use during the method call.
• returns {Transaction}: Returns a transaction which has already been sent.

Example

let account = new Dispatch.Account({
 name: 'MyAccount',
 privateKey: '472ba91402425b58a2eebf932812f20c6d7f6297bba1f83d9a58116ae6512d9e'
});

let compiled = Dispatch.Transaction.compileSource('contract x { function g() { } }');
let contract = account.createContract(compiled.contracts[0].bytecode, compiled.contracts[0].abi);
contract.whenStatusEquals('Ok')
  .then(() => {
    account.executeRead(contract, 'g', [])
        .then((result) => {
            console.log('Contract Read result:\n' + JSON.stringify(result) + '\n');
        }, (err) => {
            console.log('Contract Read result error:\n' + JSON.stringify(err) + '\n');
        });
  })
  .catch((err) => {
    console.error(err);
  });

// Or - to call a method on a deployed contract
account.executeWrite("dbf2bb4792c1ae1338b1cdc55a9f68e0e62c0fb8", 'g', []);

executeWrite

Creates and sends a transaction from the account that will execute a method on an existing Smart Contract.

Params

• {string|Account|Transaction}: to - The address of an existing contract, an Account representing the contract, or the contract creation Transaction.
• {string}: method - The method in the contract to call.
• {array}: params - The parameters to use during the method call.
• returns {Transaction}: Returns a transaction which has already been sent.

Example

let account = new Dispatch.Account({
 name: 'MyAccount',
 privateKey: '472ba91402425b58a2eebf932812f20c6d7f6297bba1f83d9a58116ae6512d9e'
});

let compiled = Dispatch.Transaction.compileSource('contract x { function g() { } }');
let contract = account.createContract(compiled.contracts[0].bytecode, compiled.contracts[0].abi);
contract.whenStatusEquals('Ok')
  .then(() => {
    account.executeWrite(contract, 'g', [])
        .whenStatusEquals('Ok')
            .then((result) => {
              console.log('Contract Write result:\n' + JSON.stringify(result) + '\n');
            }, (err) => {
              console.log('Contract Write result error:\n' + JSON.stringify(err) + '\n');
            });
  })
  .catch((err) => {
    console.error(err);
  });

// Or - to call a method on a deployed contract
account.executeWrite("dbf2bb4792c1ae1338b1cdc55a9f68e0e62c0fb8", 'g', []);

Transaction

constructor

Transaction constructor. Create an instance of a transaction, which can then be sent to a delegate.

• returns {Object}: instance of Transaction

Example

// Create a new transaction
let account = new Dispatch.Account().init();
let tx = new Dispatch.Transaction({from: account});

send

Sends the transaction to a delegate.

• returns {Promise}: Promise that will return the result of the Delegate request.

Example

let account = new Dispatch.Account({
 name: 'MyAccount',
 privateKey: '472ba91402425b58a2eebf932812f20c6d7f6297bba1f83d9a58116ae6512d9e'
});
let tx = new Dispatch.Transaction({from: account});
tx.send()
  .then((result) => {
    console.log(result);
  })
  .catch((err) => {
    console.error(err);
  });

status

Requests the current status of the transaction from a delegate.

• returns {Promise}: Promise that will return the result of the status check.

Example

let account = new Dispatch.Account({
 name: 'MyAccount',
 privateKey: '472ba91402425b58a2eebf932812f20c6d7f6297bba1f83d9a58116ae6512d9e'
});
let tx = new Dispatch.Transaction({from: account});
tx.send();
tx.status()
  .then((result) => {
    console.log(result);
  })
  .catch((err) => {
    console.error(err);
  });

whenStatusEquals

Waits until the status of the transaction matches the value provided, then resolves. Rejects after 5 seconds or when the transaction hits a non-matching final state.

Params

• {string}: status - Desired status for the transaction to acheive.
• returns {Promise}: Promise that will return the result of the status check. If a timeout occured, the returned data will be the latest known state along with a key of SDKTimeout: true.

Example

let account = new Dispatch.Account({
 name: 'MyAccount',
 privateKey: '472ba91402425b58a2eebf932812f20c6d7f6297bba1f83d9a58116ae6512d9e'
});
let tx = new Dispatch.Transaction({from: account});
tx.send();
tx.whenStatusEquals('Ok')
  .then((result) => {
    console.log(result);
  })
  .catch((err) => {
    console.error(err);
  });

compileSource

Static method to compile Solidity code directly.

Params

• {string}: source - Solidity source code containing one or more contracts.
• returns {compiledSource}: Compiled output JSON.

Example

let account = new Dispatch.Account({
 name: 'MyAccount',
 privateKey: '472ba91402425b58a2eebf932812f20c6d7f6297bba1f83d9a58116ae6512d9e'
});
let compiled = Dispatch.Transaction.compileSource('contract x { function g() { } }');
if (compiled.errors.length > 0) {
  // Errors are fatal
  console.error(compiled.errors);
} else {
  // Warnings are non-fatal
  if (compiled.warnings.length > 0) {
    console.log(compiled.warnings);
  }
  // compiled.contracts contains the name, bytecode, and abi for each contract contained within the source
  const contract = account.createContract(compiled.contracts[0].bytecode, compiled.contracts[0].abi);
}

compile

Static method to compile complex Solidity JSON structures.

Params

• {object}: input - Full Solidity JSON structure. See Compiler Input and Output JSON Description.
• returns {object}: Compiled output JSON.

Example

let compiled = Dispatch.Transaction.compile({language: 'Solidity', sources: { source: { content: 'contract x { function g() { } }' }}});

About

Contributing

Pull requests and stars are always welcome. For bugs and feature requests, please create an issue.

Running Tests

Running and reviewing unit tests is a great way to get familiarized with a library and its API. You can install dependencies and run tests with the following command:

$ npm install && npm test

Building docs

(This project's readme.md is generated by verb, please don't edit the readme directly. Any changes to the readme must be made in the .verb.md readme template.)

To generate the readme, run the following command:

$ npm install -g verbose/verb#dev verb-generate-readme && verb

Author

David Hutchings at Dispatch Labs

• LinkedIn Profile

License

Copyright © 2018, Dispatch Labs. Released under the LGPL-2.1 License.

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This file was generated by verb-generate-readme, v0.8.0, on October 16, 2018.