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Javascript API

Chain3 JavaScript API

MOAC JavaScript API was built for MOAC chain. It followed the Moac chain3.js API routines and made it close enough so the users can easily move their Ðapp to MOAC chain.

To make a Ðapp work on MOAC network, user should use the chain3 object provided by the chain3.js library. It communicates to a local MOAC node through RPC calls. chain3.js works with any MOAC node, which exposes an RPC layer.

chain3 contains the mc object - chain3.mc (for specifically MOAC blockchain interactions) and the shh object - chain3.shh (for Whisper interaction). Over time we'll introduce other objects for each of the other chain3 protocols. Working examples can be found here.

If you want to look at some more sophisticated examples using chain3.js check out these useful Ðapp patterns.

Using callbacks

As this API is designed to work with a local RPC node and all its functions are by default use synchronous HTTP requests.con

If you want to make an asynchronous request, you can pass an optional callback as the last parameter to most functions. All callbacks are using an error first callback style:

chain3.mc.getBlock(48, function(error, result){
    if(!error)
        console.log(result)
    else
        console.error(error);
})

Batch requests

Batch requests allow queuing up requests and processing them at once.

var batch = chain3.createBatch();
batch.add(chain3.mc.getBalance.request('0x0000000000000000000000000000000000000000', 'latest', callback));
batch.add(chain3.mc.contract(abi).at(address).balance.request(address, callback2));
batch.execute();

A note on big numbers in chain3.js

You will always get a BigNumber object for balance values as JavaScript is not able to handle big numbers correctly. Look at the following examples:

"101010100324325345346456456456456456456"
// "101010100324325345346456456456456456456"
101010100324325345346456456456456456456
// 1.0101010032432535e+38

chain3.js depends on the BigNumber Library and adds it automatically.

var balance = new BigNumber('131242344353464564564574574567456');
// or var balance = chain3.mc.getBalance(someAddress);

balance.plus(21).toString(10); // toString(10) converts it to a number string
// "131242344353464564564574574567477"

The next example wouldn't work as we have more than 20 floating points, therefore it is recommended that you always keep your balance in sha and only transform it to other units when presenting to the user:

var balance = new BigNumber('13124.234435346456466666457455567456');

balance.plus(21).toString(10); // toString(10) converts it to a number string, but can only show max 20 floating points 
// "13145.23443534645646666646" // you number would be cut after the 20 floating point

Chain3 Javascript Ðapp API Reference

Usage

chain3.version.api

The chain3 object provides all methods.

Example
var Chain3 = require('chain3');
// create an instance of chain3 using the HTTP provider.
var chain3 = new Chain3(new Chain3.providers.HttpProvider("http://localhost:8545"));

chain3.version.api

chain3.version.api
// or async
chain3.version.getApi(callback(error, result){ ... })
Returns

String - The moac js api version.

Example
var version = chain3.version.api;
console.log(version); // "0.2.0"

chain3.version.node

chain3.version.node
// or async
chain3.version.getClient(callback(error, result){ ... })
Returns

String - The client/node version.

Example
var version = chain3.version.node;
console.log(version); // "Moac/v0.1.0-develop/darwin-amd64/go1.9"

chain3.version.network

chain3.version.network
// or async
chain3.version.getNetwork(callback(error, result){ ... })
Returns

String - The network protocol version.

Example
var version = chain3.version.network;
console.log(version); // 54

chain3.version.moac 

chain3.version.moac
// or async
chain3.version.getMoac(callback(error, result){ ... })
Returns

String - The moac protocol version.

Example
var version = chain3.version.moac;
console.log(version); // 0x3f

chain3.isConnected 

chain3.isConnected()

Should be called to check if a connection to a node exists

Parameters

none

Returns

Boolean

Example
if(!chain3.isConnected()) {
  
   // show some dialog to ask the user to start a node

} else {
 
   // start chain3 filters, calls, etc
  
}

chain3.setProvider 

chain3.setProvider(provider)

Should be called to set provider.

Parameters

none

Returns

undefined

Example
chain3.setProvider(new chain3.providers.HttpProvider('http://localhost:8545')); // 8545 for go/moac

chain3.currentProvider 

chain3.currentProvider

Will contain the current provider, if one is set. This can be used to check if moac etc. set already a provider.

Returns

Object - The provider set or null;

Example
// Check if moac etc. already set a provider
if(!chain3.currentProvider)
    chain3.setProvider(new chain3.providers.HttpProvider("http://localhost:8545"));

chain3.reset 

chain3.reset(keepIsSyncing)

Should be called to reset state of chain3. Resets everything except manager. Uninstalls all filters. Stops polling.

Parameters
  1. Boolean - If true it will uninstall all filters, but will keep the chain3.mc.isSyncing() polls
Returns

undefined

Example
chain3.reset();

chain3.sha3 

chain3.sha3(string [, callback])
Parameters
  1. String - The string to hash using the SHA3 algorithm
  2. Function - (optional) If you pass a callback the HTTP request is made asynchronous. See this note for details.
Returns

String - The SHA3 of the given data.

Example
var str = chain3.sha3("Some ASCII string to be hashed in MOAC");
console.log(str); // "0xbfa24877cd68e6734710402a2af3e29cf18bd6d2f304aa528ffa3a32fa7652d2"

chain3.toHex

chain3.toHex(mixed);

Converts any value into HEX.

Parameters
  1. String|Number|Object|Array|BigNumber - The value to parse to HEX. If its an object or array it will be JSON.stringify first. If its a BigNumber it will make it the HEX value of a number.
Returns

String - The hex string of mixed.

Example
var str = chain3.toHex(moac network);
console.log(str); // '0x6d6f6163206e6574776f726b'

console.log(chain3.toHex({moac: 'test'}));
//'0x7b226d6f6163223a2274657374227d'

chain3.toAscii

chain3.toAscii

chain3.toAscii(hexString);

Converts a HEX string into a ASCII string.

Parameters
  1. String - A HEX string to be converted to ascii.
Returns

String - An ASCII string made from the given hexString.

Example
var str = chain3.toAscii("0x0x6d6f6163206e6574776f726b");
console.log(str); // "moac network"

chain3.fromAscii

chain3.fromAscii(string);

Converts any ASCII string to a HEX string.

Parameters

String - An ASCII string to be converted to HEX.

Returns

String - The converted HEX string.

Example
var str = chain3.fromAscii('moac network');
console.log(str); // "0x0x6d6f6163206e6574776f726b"

chain3.toChecksumAddress 

chain3.toChecksumAddress(hexString);

Converts a string to the checksummed address equivalent.

Parameters
  1. String - A string to be converted to a checksummed address.
Returns

String - A string containing the checksummed address.

Example
var myAddress = chain3.toChecksumAddress('0xa0c876ec9f2d817c4304a727536f36363840c02c');
console.log(myAddress); // '0xA0C876eC9F2d817c4304A727536f36363840c02c'

chain3.toDecimal 

chain3.toDecimal(hexString);

Converts a HEX string to its number representation.

Parameters
  1. String - An HEX string to be converted to a number.
Returns

Number - The number representing the data hexString.

Example
var number = chain3.toDecimal('0x15');
console.log(number); // 21

chain3.fromDecimal

chain3.fromDecimal(number);

Converts a number or number string to its HEX representation.

Parameters
  1. Number|String - A number to be converted to a HEX string.
Returns

String - The HEX string representing of the given number.

Example
var value = chain3.fromDecimal('21');
console.log(value); // "0x15"

chain3.fromSha

chain3.fromSha(number, unit)

Converts a number of sha into the following moac units:

  • ksha/femtomc
  • msha/picomc
  • gsha/nano/xiao
  • micro/sand
  • milli
  • mc
  • kmc/grand
  • mmc
  • gmc
  • tmc
Parameters
  1. Number|String|BigNumber - A number or BigNumber instance.
  2. String - One of the above moac units.
Returns

String|BigNumber - Either a number string, or a BigNumber instance, depending on the given number parameter.

Example
var value = chain3.fromSha('21000000000000', 'Xiao');
console.log(value); // "21000"

chain3.toSha 

chain3.toSha(number, unit)

Converts a moac unit into sha. Possible units are:

  • ksha/femtomc
  • msha/picomc
  • gsha/nano/xiao
  • micro/sand
  • milli
  • mc
  • kmc/grand
  • mmc
  • gmc
  • tmc
Parameters
  1. Number|String|BigNumber - A number or BigNumber instance.
  2. String - One of the above moac units.
Returns

String|BigNumber - Either a number string, or a BigNumber instance, depending on the given number parameter.

Example
var value = chain3.toSha('1', 'mc');
console.log(value); // "1000000000000000000" = 1e18

chain3.toBigNumber 

chain3.toBigNumber(numberOrHexString);

Converts a given number into a BigNumber instance.

See the note on BigNumber.

Parameters
  1. Number|String - A number, number string or HEX string of a number.
Returns

BigNumber - A BigNumber instance representing the given value.

Example
var value = chain3.toBigNumber('200000000000000000000001');
console.log(value); // instanceOf BigNumber
console.log(value.toNumber()); // 2.0000000000000002e+23
console.log(value.toString(10)); // '200000000000000000000001'

chain3.net

chain3.net.listening

chain3.net.listening
// or async
chain3.net.getListening(callback(error, result){ ... })

This property is read only and says whether the node is actively listening for network connections or not.

Returns

Boolean - true if the client is actively listening for network connections, otherwise false.

Example
var listening = chain3.net.listening;
console.log(listening); // true of false

chain3.net.peerCount 

chain3.net.peerCount
// or async
chain3.net.getPeerCount(callback(error, result){ ... })

This property is read only and returns the number of connected peers.

Returns

Number - The number of peers currently connected to the client.

Example
var peerCount = chain3.net.peerCount;
console.log(peerCount); // 4

chain3.mc

Contains the MOAC blockchain related methods.

Example
var mc = chain3.mc;

chain3.mc.defaultAccount 

chain3.mc.defaultAccount

This default address is used for the following methods (optionally you can overwrite it by specifying the from property):

Values

String, 20 Bytes - Any address you own, or where you have the private key for.

Default is undefined.

Returns

String, 20 Bytes - The currently set default address.

Example
var defaultAccount = chain3.mc.defaultAccount;
console.log(defaultAccount); // ''

// set the default block
chain3.mc.defaultAccount = '0x8888f1f195afa192cfee860698584c030f4c9db1';

chain3.mc.defaultBlock 

chain3.mc.defaultBlock

This default block is used for the following methods (optionally you can overwrite the defaultBlock by passing it as the last parameter):

Values

Default block parameters can be one of the following:

  • Number - a block number
  • String - "earliest", the genisis block
  • String - "latest", the latest block (current head of the blockchain)
  • String - "pending", the currently mined block (including pending transactions)

Default is latest

Returns

Number|String - The default block number to use when querying a state.

Example
var defaultBlock = chain3.mc.defaultBlock;
console.log(defaultBlock); // 'latest'

// set the default block
chain3.mc.defaultBlock = 231;

chain3.mc.syncing 

chain3.mc.syncing
// or async
chain3.mc.getSyncing(callback(error, result){ ... })

This property is read only and returns the either a sync object, when the node is syncing or false.

Returns

Object|Boolean - A sync object as follows, when the node is currently syncing or false:

  • startingBlock: Number - The block number where the sync started.
  • currentBlock: Number - The block number where at which block the node currently synced to already.
  • highestBlock: Number - The estimated block number to sync to.
Example
var sync = chain3.mc.syncing;
console.log(sync);
/*
{
   startingBlock: 300,
   currentBlock: 312,
   highestBlock: 512
}
*/

chain3.mc.isSyncing 

chain3.mc.isSyncing(callback);

This convenience function calls the callback everytime a sync starts, updates and stops.

Returns

Object - a isSyncing object with the following methods:

  • syncing.addCallback(): Adds another callback, which will be called when the node starts or stops syncing.
  • syncing.stopWatching(): Stops the syncing callbacks.
Callback return value
  • Boolean - The callback will be fired with true when the syncing starts and with false when it stopped.
  • Object - While syncing it will return the syncing object:
    • startingBlock: Number - The block number where the sync started.
    • currentBlock: Number - The block number where at which block the node currently synced to already.
    • highestBlock: Number - The estimated block number to sync to.
Example
chain3.mc.isSyncing(function(error, sync){
    if(!error) {
        // stop all app activity
        if(sync === true) {
           // we use `true`, so it stops all filters, but not the chain3.mc.syncing polling
           chain3.reset(true);
        
        // show sync info
        } else if(sync) {
           console.log(sync.currentBlock);
        
        // re-gain app operation
        } else {
            // run your app init function...
        }
    }
});

chain3.mc.isSyncing 

chain3.mc.coinbase
// or async
chain3.mc.getCoinbase(callback(error, result){ ... })

This property is read only and returns the coinbase address were the mining rewards go to.

Returns

String - The coinbase address of the client.

Example
var coinbase = chain3.mc.coinbase;
console.log(coinbase); // "0x407d73d8a49eeb85d32cf465507dd71d507100c1"

chain3.mc.mining 

chain3.mc.mining
// or async
chain3.mc.getMining(callback(error, result){ ... })

This property is read only and says whether the node is mining or not.

Returns

Boolean - true if the client is mining, otherwise false.

Example
var mining = chain3.mc.mining;
console.log(mining); // true or false

chain3.mc.hashrate 

chain3.mc.hashrate
// or async
chain3.mc.getHashrate(callback(error, result){ ... })

This property is read only and returns the number of hashes per second that the node is mining with.

Returns

Number - number of hashes per second.

Example
var hashrate = chain3.mc.hashrate;
console.log(hashrate); // 493736

chain3.mc.gasPrice 

chain3.mc.gasPrice
// or async
chain3.mc.getGasPrice(callback(error, result){ ... })

This property is read only and returns the current gas price. The gas price is determined by the x latest blocks median gas price.

Returns

BigNumber - A BigNumber instance of the current gas price in sha.

See the note on BigNumber.

Example
var gasPrice = chain3.mc.gasPrice;
console.log(gasPrice.toString(10)); // "10000000000000"

chain3.mc.accounts 

chain3.mc.accounts
// or async
chain3.mc.getAccounts(callback(error, result){ ... })

This property is read only and returns a list of accounts the node controls.

Returns

Array - An array of addresses controlled by client.

Example
var accounts = chain3.mc.accounts;
console.log(accounts); // ["0x407d73d8a49eeb85d32cf465507dd71d507100c1"]

chain3.mc.blockNumber 

chain3.mc.blockNumber
// or async
chain3.mc.getBlockNumber(callback(error, result){ ... })

This property is read only and returns the current block number.

Returns

Number - The number of the most recent block.

Example
var number = chain3.mc.blockNumber;
console.log(number); // 2744

chain3.mc.getBalance 

chain3.mc.getBalance(addressHexString [, defaultBlock] [, callback])

Get the balance of an address at a given block.

Parameters
  1. String - The address to get the balance of.
  2. Number|String - (optional) If you pass this parameter it will not use the default block set with chain3.mc.defaultBlock.
  3. Function - (optional) If you pass a callback the HTTP request is made asynchronous. See this note for details.
Returns

String - A BigNumber instance of the current balance for the given address in sha.

See the note on BigNumber.

Example
var balance = chain3.mc.getBalance("0x407d73d8a49eeb85d32cf465507dd71d507100c1");
console.log(balance); // instanceof BigNumber
console.log(balance.toString(10)); // '1000000000000'
console.log(balance.toNumber()); // 1000000000000

chain3.mc.getStorageAt 

chain3.mc.getStorageAt(addressHexString, position [, defaultBlock] [, callback])

Get the storage at a specific position of an address.

Parameters
  1. String - The address to get the storage from.
  2. Number - The index position of the storage.
  3. Number|String - (optional) If you pass this parameter it will not use the default block set with chain3.mc.defaultBlock.
  4. Function - (optional) If you pass a callback the HTTP request is made asynchronous. See this note for details.
Returns

String - The value in storage at the given position.

Example
var state = chain3.mc.getStorageAt("0x407d73d8a49eeb85d32cf465507dd71d507100c1", 0);
console.log(state); // "0x03"

chain3.mc.getCode 

chain3.mc.getCode(addressHexString [, defaultBlock] [, callback])

Get the code at a specific address.

Parameters
  1. String - The address to get the code from.
  2. Number|String - (optional) If you pass this parameter it will not use the default block set with chain3.mc.defaultBlock.
  3. Function - (optional) If you pass a callback the HTTP request is made asynchronous. See this note for details.
Returns

String - The data at given address addressHexString.

Example
var code = chain3.mc.getCode("0xd5677cf67b5aa051bb40496e68ad359eb97cfbf8");
console.log(code); // "0x600160008035811a818181146012578301005b601b6001356025565b8060005260206000f25b600060078202905091905056"

chain3.mc.getBlock 

 chain3.mc.getBlock(blockHashOrBlockNumber [, returnTransactionObjects] [, callback])

Returns a block matching the block number or block hash.

Parameters
  1. String|Number - The block number or hash. Or the string "earliest", "latest" or "pending" as in the default block parameter.
  2. Boolean - (optional, default false) If true, the returned block will contain all transactions as objects, if false it will only contains the transaction hashes.
  3. Function - (optional) If you pass a callback the HTTP request is made asynchronous. See this note for details.
Returns

Object - The block object:

  • number: Number - the block number. null when its pending block.
  • hash: String, 32 Bytes - hash of the block. null when its pending block.
  • parentHash: String, 32 Bytes - hash of the parent block.
  • nonce: String, 8 Bytes - hash of the generated proof-of-work. null when its pending block.
  • sha3Uncles: String, 32 Bytes - SHA3 of the uncles data in the block.
  • logsBloom: String, 256 Bytes - the bloom filter for the logs of the block. null when its pending block.
  • transactionsRoot: String, 32 Bytes - the root of the transaction trie of the block
  • stateRoot: String, 32 Bytes - the root of the final state trie of the block.
  • miner: String, 20 Bytes - the address of the beneficiary to whom the mining rewards were given.
  • difficulty: BigNumber - integer of the difficulty for this block.
  • totalDifficulty: BigNumber - integer of the total difficulty of the chain until this block.
  • extraData: String - the "extra data" field of this block.
  • size: Number - integer the size of this block in bytes.
  • gasLimit: Number - the maximum gas allowed in this block.
  • gasUsed: Number - the total used gas by all transactions in this block.
  • timestamp: Number - the unix timestamp for when the block was collated.
  • transactions: Array - Array of transaction objects, or 32 Bytes transaction hashes depending on the last given parameter.
  • uncles: Array - Array of uncle hashes.
Example
var info = chain3.mc.block(3150);
console.log(info);
/*
{
  difficulty: 142913,
  extraData: "0xd5820100846d6f616385676f312e398664617277696e",
  gasLimit: 1732862932,
  gasUsed: 20000,
  hash: "0x43ab9feea269585e11b0c4c9d91449cbeae44395dcc2eb1d726a64e5a00047f7",
  logsBloom: "0x00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000",
  miner: "0xa8863fc8ce3816411378685223c03daae9770ebb",
  mixHash: "0x9c879f1f4570f832091222f31495db378b43496e3115c96bc40f9f57915f1b59",
  nonce: "0x71b4365850bc8a10",
  number: 929,
  parentHash: "0x9e460922544a32fb9c634ee93793f19bcb033db53ac07c6008cbb2b354904d74",
  receiptsRoot: "0x1a8c28ca2760b9534a1d1edfb4b3748f62f875631eccd2656babeb9cefdc6fdb",
  sha3Uncles: "0x1dcc4de8dec75d7aab85b567b6ccd41ad312451b948a7413f0a142fd40d49347",
  size: 667,
  stateRoot: "0xb788c2ba4111b8ad4bd7fc39908dd63200fa93618f105bee8495723ac0f227c4",
  timestamp: 1518453915,
  totalDifficulty: 135134971,
  transactions: ["0x0c2a15d54db54f69d81dbb0046fc0e3acd8e790fda9e198d09827292ceb0ba13"],
  transactionsRoot: "0xdc160a6056769aa497940af2155ab2d4d106aab5fca352559a2918b17ff6087f",
  uncles: []
}
*/

chain3.mc.getBlockTransactionCount 

chain3.mc.getBlockTransactionCount(hashStringOrBlockNumber [, callback])

Returns the number of transaction in a given block.

Parameters
  1. String|Number - The block number or hash. Or the string "earliest", "latest" or "pending" as in the default block parameter.
  2. Function - (optional) If you pass a callback the HTTP request is made asynchronous. See this note for details.
Returns

Number - The number of transactions in the given block.

Example
var number = chain3.mc.getBlockTransactionCount("0x407d73d8a49eeb85d32cf465507dd71d507100c1");
console.log(number); // 1

chain3.mc.getUncle 

chain3.mc.getUncle(blockHashStringOrNumber, uncleNumber [, returnTransactionObjects] [, callback])

Returns a blocks uncle by a given uncle index position.

Parameters
  1. String|Number - The block number or hash. Or the string "earliest", "latest" or "pending" as in the default block parameter.
  2. Number - The index position of the uncle.
  3. Boolean - (optional, default false) If true, the returned block will contain all transactions as objects, if false it will only contains the transaction hashes.
  4. Function - (optional) If you pass a callback the HTTP request is made asynchronous. See this note for details.
Returns

Object - the returned uncle. For a return value see chain3.mc.getBlock().

Note: An uncle doesn't contain individual transactions.

Example
var uncle = chain3.mc.getUncle(500, 0);
console.log(uncle); // see chain3.mc.getBlock

chain3.mc.getTransaction 

chain3.mc.getTransaction(transactionHash [, callback])

Returns a transaction matching the given transaction hash.

Parameters
  1. String - The transaction hash.
  2. Function - (optional) If you pass a callback the HTTP request is made asynchronous. See this note for details.
Returns

Object - A transaction object its hash transactionHash:

  • hash: String, 32 Bytes - hash of the transaction.
  • nonce: Number - the number of transactions made by the sender prior to this one.
  • blockHash: String, 32 Bytes - hash of the block where this transaction was in. null when its pending.
  • blockNumber: Number - block number where this transaction was in. null when its pending.
  • transactionIndex: Number - integer of the transactions index position in the block. null when its pending.
  • from: String, 20 Bytes - address of the sender.
  • to: String, 20 Bytes - address of the receiver. null when its a contract creation transaction.
  • value: BigNumber - value transferred in Sha.
  • gasPrice: BigNumber - gas price provided by the sender in Sha.
  • gas: Number - gas provided by the sender.
  • input: String - the data sent along with the transaction.
Example
var txhash = "0x0c2a15d54db54f69d81dbb0046fc0e3acd8e790fda9e198d09827292ceb0ba13";

var transaction = chain3.mc.getTransaction(txhash);
console.log(transaction);
/*
{
  blockHash: "0x43ab9feea269585e11b0c4c9d91449cbeae44395dcc2eb1d726a64e5a00047f7",
  blockNumber: 929,
  from: "0x7312f4b8a4457a36827f185325fd6b66a3f8bb8b",
  gas: 2000000,
  gasPrice: 0,
  hash: "0x0c2a15d54db54f69d81dbb0046fc0e3acd8e790fda9e198d09827292ceb0ba13",
  input: "0x",
  nonce: 1,
  r: "0x5487c81b1ab58a7364b39263fd51afee9e7ad32be1c3b5ddeb656f06d75b1d68",
  s: "0x3f06414699c02f74c5075e24c5f266a25a64dbdf77ce82e57b1def6c5e198f9f",
  to: "0xd814f2ac2c4ca49b33066582e4e97ebae02f2ab9",
  transactionIndex: 0,
  v: "0x25",
  value: 500000000000000000
}
*/

chain3.mc.getTransactionFromBlock 

getTransactionFromBlock(hashStringOrNumber, indexNumber [, callback])

Returns a transaction based on a block hash or number and the transactions index position.

Parameters
  1. String - A block number or hash. Or the string "earliest", "latest" or "pending" as in the default block parameter.
  2. Number - The transactions index position.
  3. Function - (optional) If you pass a callback the HTTP request is made asynchronous. See this note for details.
Returns

Object - A transaction object, see chain3.mc.getTransaction:

Example
var transaction = chain3.mc.getTransactionFromBlock(921, 2);
console.log(transaction); // see chain3.mc.getTransaction

chain3.mc.getTransactionReceipt 

chain3.mc.getTransactionReceipt(hashString [, callback])

Returns the receipt of a transaction by transaction hash.

Note That the receipt is not available for pending transactions.

Parameters
  1. String - The transaction hash.
  2. Function - (optional) If you pass a callback the HTTP request is made asynchronous. See this note for details.
Returns

Object - A transaction receipt object, or null when no receipt was found:

  • blockHash: String, 32 Bytes - hash of the block where this transaction was in.
  • blockNumber: Number - block number where this transaction was in.
  • transactionHash: String, 32 Bytes - hash of the transaction.
  • transactionIndex: Number - integer of the transactions index position in the block.
  • from: String, 20 Bytes - address of the sender.
  • to: String, 20 Bytes - address of the receiver. null when its a contract creation transaction.
  • cumulativeGasUsed : Number - The total amount of gas used when this transaction was executed in the block.
  • gasUsed : Number - The amount of gas used by this specific transaction alone.
  • contractAddress : String - 20 Bytes - The contract address created, if the transaction was a contract creation, otherwise null.
  • logs : Array - Array of log objects, which this transaction generated.
Example
var receipt = chain3.mc.getTransactionReceipt('0x9fc76417374aa880d4449a1f7f31ec597f00b1f6f3dd2d66f4c9c6c445836d8b');
console.log(receipt);
{
  "transactionHash": "0x9fc76417374aa880d4449a1f7f31ec597f00b1f6f3dd2d66f4c9c6c445836d8b",
  "transactionIndex": 0,
  "blockHash": "0xef95f2f1ed3ca60b048b4bf67cde2195961e0bba6f70bcbea9a2c4e133e34b46",
  "blockNumber": 3,
  "contractAddress": "0xa94f5374fce5edbc8e2a8697c15331677e6ebf0b",
  "cumulativeGasUsed": 314159,
  "gasUsed": 30234,
  "logs": [{
         // logs as returned by getFilterLogs, etc.
     }, ...]
}

chain3.mc.getTransactionCount 

chain3.mc.getTransactionCount(addressHexString [, defaultBlock] [, callback])

Get the numbers of transactions sent from this address.

Parameters
  1. String - The address to get the numbers of transactions from.
  2. Number|String - (optional) If you pass this parameter it will not use the default block set with chain3.mc.defaultBlock.
  3. Function - (optional) If you pass a callback the HTTP request is made asynchronous. See this note for details.
Returns

Number - The number of transactions sent from the given address.

Example
var number = chain3.mc.getTransactionCount("0x407d73d8a49eeb85d32cf465507dd71d507100c1");
console.log(number); // 1

chain3.mc.sendTransaction 

chain3.mc.sendTransaction(transactionObject [, callback])

Sends a transaction to the network.

Parameters
  1. Object - The transaction object to send:
  • from: String - The address for the sending account. Uses the chain3.mc.defaultAccount property, if not specified.
  • to: String - (optional) The destination address of the message, left undefined for a contract-creation transaction.
  • value: Number|String|BigNumber - (optional) The value transferred for the transaction in Sha, also the endowment if it's a contract-creation transaction.
  • gas: Number|String|BigNumber - (optional, default: To-Be-Determined) The amount of gas to use for the transaction (unused gas is refunded).
  • gasPrice: Number|String|BigNumber - (optional, default: To-Be-Determined) The price of gas for this transaction in sha, defaults to the mean network gas price.
  • data: String - (optional) Either a byte string containing the associated data of the message, or in the case of a contract-creation transaction, the initialisation code.
  • nonce: Number - (optional) Integer of a nonce. This allows to overwrite your own pending transactions that use the same nonce.
  • scsConsensusAddr: String - (optional) The address of the SCS consensus protocol, left undefined for global contract-creation transaction, required for direct contract-creation transaction
  1. Function - (optional) If you pass a callback the HTTP request is made asynchronous. See this note for details.
Returns

String - The 32 Bytes transaction hash as HEX string.

If the transaction was a contract creation use chain3.mc.getTransactionReceipt() to get the contract address, after the transaction was mined.

Example
// compiled solidity source code using https://chriseth.github.io/cpp-ethereum/
var code = "603d80600c6000396000f3007c01000000000000000000000000000000000000000000000000000000006000350463c6888fa18114602d57005b600760043502
8060005260206000f3";

chain3.mc.sendTransaction({data: code}, function(err, address) {
  if (!err)
    console.log(address); // "0x7f9fade1c0d57a7af66ab4ead7c2eb7b11a91385"
});

chain3.mc.call 

chain3.mc.call(callObject [, defaultBlock] [, callback])

Executes a message call transaction, which is directly executed in the VM of the node, but never mined into the blockchain.

Parameters
  1. Object - A transaction object see chain3.mc.sendTransaction, with the difference that for calls the from property is optional as well.
  2. Number|String - (optional) If you pass this parameter it will not use the default block set with chain3.mc.defaultBlock.
  3. Function - (optional) If you pass a callback the HTTP request is made asynchronous. See this note for details.
Returns

String - The returned data of the call, e.g. a codes functions return value.

Example
var result = chain3.mc.call({
    to: "0xc4abd0339eb8d57087278718986382264244252f", 
    data: "0xc6888fa10000000000000000000000000000000000000000000000000000000000000003"
});
console.log(result); // "0x0000000000000000000000000000000000000000000000000000000000000015"

chain3.mc.estimateGas 

chain3.mc.estimateGas(callObject [, defaultBlock] [, callback])

Executes a message call or transaction, which is directly executed in the VM of the node, but never mined into the blockchain and returns the amount of the gas used.

Parameters

See chain3.mc.sendTransaction, expect that all properties are optional.

Returns

Number - the used gas for the simulated call/transaction.

Example
var result = chain3.mc.estimateGas({
    to: "0xc4abd0339eb8d57087278718986382264244252f", 
    data: "0xc6888fa10000000000000000000000000000000000000000000000000000000000000003"
});
console.log(result); // "20465"

chain3.mc.filter 

// can be 'latest' or 'pending'
var filter = chain3.mc.filter(filterString);
// OR object are log filter options
var filter = chain3.mc.filter(options);

// watch for changes
filter.watch(function(error, result){
  if (!error)
    console.log(result);
});

// Additionally you can start watching right away, by passing a callback:
chain3.mc.filter(options, function(error, result){
  if (!error)
    console.log(result);
});
Parameters
  1. String|Object - The string "latest" or "pending" to watch for changes in the latest block or pending transactions respectively. Or a filter options object as follows:
  • fromBlock: Number|String - The number of the earliest block (latest may be given to mean the most recent and pending currently mining, block). By default latest.
  • toBlock: Number|String - The number of the latest block (latest may be given to mean the most recent and pending currently mining, block). By default latest.
  • address: String - An address or a list of addresses to only get logs from particular account(s).
  • topics: Array of Strings - An array of values which must each appear in the log entries. The order is important, if you want to leave topics out use null, e.g. [null, '0x00...']. You can also pass another array for each topic with options for that topic e.g. [null, ['option1', 'option2']]
Returns

Object - A filter object with the following methods:

  • filter.get(callback): Returns all of the log entries that fit the filter.
  • filter.watch(callback): Watches for state changes that fit the filter and calls the callback. See this note for details.
  • filter.stopWatching(): Stops the watch and uninstalls the filter in the node. Should always be called once it is done.
Watch callback return value
  • String - When using the "latest" parameter, it returns the block hash of the last incoming block.
  • String - When using the "pending" parameter, it returns a transaction hash of the last add pending transaction.
  • Object - When using manual filter options, it returns a log object as follows:
    • logIndex: Number - integer of the log index position in the block. null when its pending log.
    • transactionIndex: Number - integer of the transactions index position log was created from. null when its pending log.
    • transactionHash: String, 32 Bytes - hash of the transactions this log was created from. null when its pending log.
    • blockHash: String, 32 Bytes - hash of the block where this log was in. null when its pending. null when its pending log.
    • blockNumber: Number - the block number where this log was in. null when its pending. null when its pending log.
    • address: String, 32 Bytes - address from which this log originated.
    • data: String - contains one or more 32 Bytes non-indexed arguments of the log.
    • topics: Array of Strings - Array of 0 to 4 32 Bytes DATA of indexed log arguments. (In solidity: The first topic is the hash of the signature of the event (e.g. Deposit(address,bytes32,uint256)), except you declared the event with the anonymous specifier.)

Note For event filter return values see Contract Events

Example
var filter = chain3.mc.filter('pending');

filter.watch(function (error, log) {
  console.log(log); //  {"address":"0x0000000000000000000000000000000000000000", "data":"0x0000000000000000000000000000000000000000000000000000000000000000", ...}
});

// get all past logs again.
var myResults = filter.get(function(error, logs){ ... });

...

// stops and uninstalls the filter
filter.stopWatching();

chain3.mc.contract 

chain3.mc.contract(abiArray)

Creates a contract object for a solidity contract, which can be used to initiate contracts on an address. You can read more about events here.

Parameters
  1. Array - ABI array with descriptions of functions and events of the contract.
Returns

Object - A contract object, which can be initiated as follows:

var MyContract = chain3.mc.contract(abiArray);

// instantiate by address
var contractInstance = MyContract.at([address]);

// deploy new contract
var contractInstance = MyContract.new([contructorParam1] [, contructorParam2], {data: '0x12345...', from: myAccount, gas: 1000000});

// Get the data to deploy the contract manually
var contractData = MyContract.new.getData([contructorParam1] [, contructorParam2], {data: '0x12345...'});
// contractData = '0x12345643213456000000000023434234'

And then you can either initiate an existing contract on an address, or deploy the contract using the compiled byte code:

// Instantiate from an existing address:
var myContractInstance = MyContract.at(myContractAddress);


// Or deploy a new contract:

// Deploy the contract asyncronous:
var myContractReturned = MyContract.new(param1, param2, {
   data: myContractCode,
   gas: 300000,
   from: mySenderAddress}, function(err, myContract){
    if(!err) {
       // NOTE: The callback will fire twice!
       // Once the contract has the transactionHash property set and once its deployed on an address.

       // e.g. check tx hash on the first call (transaction send)
       if(!myContract.address) {
           console.log(myContract.transactionHash) // The hash of the transaction, which deploys the contract
       
       // check address on the second call (contract deployed)
       } else {
           console.log(myContract.address) // the contract address
       }

       // Note that the returned "myContractReturned" === "myContract",
       // so the returned "myContractReturned" object will also get the address set.
    }
  });

// Deploy contract syncronous: The address will be added as soon as the contract is mined.
// Additionally you can watch the transaction by using the "transactionHash" property
var myContractInstance = MyContract.new(param1, param2, {data: myContractCode, gas: 300000, from: mySenderAddress});
myContractInstance.transactionHash // The hash of the transaction, which created the contract
myContractInstance.address // undefined at start, but will be auto-filled later

Note When you deploy a new contract, you should check for the next 12 blocks or so if the contract code is still at the address (using chain3.mc.getCode()), to make sure a fork didn't change that.

Example
// contract abi
var abi = [{
     name: 'myConstantMethod',
     type: 'function',
     constant: true,
     inputs: [{ name: 'a', type: 'string' }],
     outputs: [{name: 'd', type: 'string' }]
}, {
     name: 'myStateChangingMethod',
     type: 'function',
     constant: false,
     inputs: [{ name: 'a', type: 'string' }, { name: 'b', type: 'int' }],
     outputs: []
}, {
     name: 'myEvent',
     type: 'event',
     inputs: [{name: 'a', type: 'int', indexed: true},{name: 'b', type: 'bool', indexed: false]
}];

// creation of contract object
var MyContract = chain3.mc.contract(abi);

// initiate contract for an address
var myContractInstance = MyContract.at('0xc4abd0339eb8d57087278718986382264244252f');

// call constant function
var result = myContractInstance.myConstantMethod('myParam');
console.log(result) // '0x25434534534'

// send a transaction to a function
myContractInstance.myStateChangingMethod('someParam1', 23, {value: 200, gas: 2000});

// short hand style
chain3.mc.contract(abi).at(address).myAwesomeMethod(...);

// create filter
var filter = myContractInstance.myEvent({a: 5}, function (error, result) {
  if (!error)
    console.log(result);
    /*
    {
        address: '0x8718986382264244252fc4abd0339eb8d5708727',
        topics: "0x12345678901234567890123456789012", "0x0000000000000000000000000000000000000000000000000000000000000005",
        data: "0x0000000000000000000000000000000000000000000000000000000000000001",
        ...
    }
    */
});

Contract Methods

// Automatically determines the use of call or sendTransaction based on the method type
myContractInstance.myMethod(param1 [, param2, ...] [, transactionObject] [, callback]);

// Explicitly calling this method
myContractInstance.myMethod.call(param1 [, param2, ...] [, transactionObject] [, callback]);

// Explicitly sending a transaction to this method
myContractInstance.myMethod.sendTransaction(param1 [, param2, ...] [, transactionObject] [, callback]);

// Explicitly sending a transaction to this method
myContractInstance.myMethod.sendTransaction(param1 [, param2, ...] [, transactionObject] [, callback]);

// Get the call data, so you can call the contract through some other means
var myCallData = myContractInstance.myMethod.getData(param1 [, param2, ...]);
// myCallData = '0x45ff3ff6000000000004545345345345..'

The contract object exposes the contracts methods, which can be called using parameters and a transaction object.

Parameters
  • String|Number - (optional) Zero or more parameters of the function.
  • Object - (optional) The (previous) last parameter can be a transaction object, see chain3.mc.sendTransaction parameter 1 for more.
  • Function - (optional) If you pass a callback as the last parameter the HTTP request is made asynchronous. See this note for details.
Returns

String - If its a call the result data, if its a send transaction a created contract address, or the transaction hash, see chain3.mc.sendTransaction for details.

Example
// creation of contract object
var MyContract = chain3.mc.contract(abi);

// initiate contract for an address
var myContractInstance = MyContract.at('0x78e97bcc5b5dd9ed228fed7a4887c0d7287344a9');

var result = myContractInstance.myConstantMethod('myParam');
console.log(result) // '0x25434534534'

myContractInstance.myStateChangingMethod('someParam1', 23, {value: 200, gas: 2000}, function(err, result){ ... });

Contract Events

var event = myContractInstance.MyEvent({valueA: 23} [, additionalFilterObject])

// watch for changes
event.watch(function(error, result){
  if (!error)
    console.log(result);
});

// Or pass a callback to start watching immediately
var event = myContractInstance.MyEvent([{valueA: 23}] [, additionalFilterObject] , function(error, result){
  if (!error)
    console.log(result);
});

You can use events like filters and they have the same methods, but you pass different objects to create the event filter.

Parameters
  1. Object - Indexed return values you want to filter the logs by, e.g. {'valueA': 1, 'valueB': [myFirstAddress, mySecondAddress]}. By default all filter values are set to null. It means, that they will match any event of given type sent from this contract.
  2. Object - Additional filter options, see filters parameter 1 for more. By default filterObject has field 'address' set to address of the contract. Also first topic is the signature of event.
  3. Function - (optional) If you pass a callback as the last parameter it will immediately start watching and you don't need to call myEvent.watch(function(){}). See this note for details.
Callback return

Object - An event object as follows:

  • args: Object - The arguments coming from the event.
  • event: String - The event name.
  • logIndex: Number - integer of the log index position in the block.
  • transactionIndex: Number - integer of the transactions index position log was created from.
  • transactionHash: String, 32 Bytes - hash of the transactions this log was created from.
  • address: String, 32 Bytes - address from which this log originated.
  • blockHash: String, 32 Bytes - hash of the block where this log was in. null when its pending.
  • blockNumber: Number - the block number where this log was in. null when its pending.
Example
var MyContract = chain3.mc.contract(abi);
var myContractInstance = MyContract.at('0x78e97bcc5b5dd9ed228fed7a4887c0d7287344a9');

// watch for an event with {some: 'args'}
var myEvent = myContractInstance.MyEvent({some: 'args'}, {fromBlock: 0, toBlock: 'latest'});
myEvent.watch(function(error, result){
   ...
});

// would get all past logs again.
var myResults = myEvent.get(function(error, logs){ ... });

...

// would stop and uninstall the filter
myEvent.stopWatching();

Contract allEvents

var events = myContractInstance.allEvents([additionalFilterObject]);

// watch for changes
events.watch(function(error, event){
  if (!error)
    console.log(event);
});

// Or pass a callback to start watching immediately
var events = myContractInstance.allEvents([additionalFilterObject,] function(error, log){
  if (!error)
    console.log(log);
});

Will call the callback for all events which are created by this contract.

Parameters
  1. Object - Additional filter options, see filters parameter 1 for more. By default filterObject has field 'address' set to address of the contract. Also first topic is the signature of event.
  2. Function - (optional) If you pass a callback as the last parameter it will immediately start watching and you don't need to call myEvent.watch(function(){}). See this note for details.
Callback return

Object - See Contract Events for more.

Example
var MyContract = chain3.mc.contract(abi);
var myContractInstance = MyContract.at('0x78e97bcc5b5dd9ed228fed7a4887c0d7287344a9');

// watch for an event with {some: 'args'}
var events = myContractInstance.allEvents({fromBlock: 0, toBlock: 'latest'});
events.watch(function(error, result){
   ...
});

// would get all past logs again.
events.get(function(error, logs){ ... });

...

// would stop and uninstall the filter
myEvent.stopWatching();

chain3.encodeParams 

chain3.encodeParams

Encode a list of parameters array into HEX codes.

Parameters
  • types - list of types of params
  • params - list of values of params
Example
var Chain3 = require('../index.js');
var chain3 = new Chain3();


// Test with list of parameters
var types = ['int','string'];
var args = [100, '4000'];

var dataHex = '0x' + chain3.encodeParams(types, args);
console.log("encoded params:", dataHex);

// outputs
encoded params:0x0000000000000000000000000000000000000000000000000000000000000064000000000000000000000000000000000000000000000000000000000000004000000000000000000000000000000000000000000000000000000000000000043430303000000000000000000000000000000000000000000000000000000000

chain3.mc.namereg 

chain3.mc.namereg

Returns GlobalRegistrar object.

Usage

see namereg example

chain3.mc.sendIBANTransaction 

var txHash = chain3.mc.sendIBANTransaction('0x00c5496aee77c1ba1f0854206a26dda82a81d6d8', 'XE81ETHXREGGAVOFYORK', 0x100);

Sends IBAN transaction from user account to destination IBAN address.

Parameters
  • string - address from which we want to send transaction
  • string - IBAN address to which we want to send transaction
  • value - value that we want to send in IBAN transaction

chain3.mc.iban 

var i = new chain3.mc.iban("XE81ETHXREGGAVOFYORK");

chain3.mc.iban.fromAddress 

var i = chain3.mc.iban.fromAddress('0x00c5496aee77c1ba1f0854206a26dda82a81d6d8');
console.log(i.toString()); // 'XE7338O073KYGTWWZN0F2WZ0R8PX5ZPPZS

chain3.mc.iban.fromBban 

var i = chain3.mc.iban.fromBban('ETHXREGGAVOFYORK');
console.log(i.toString()); // "XE81ETHXREGGAVOFYORK"

chain3.mc.iban.createIndirect 

var i = chain3.mc.iban.createIndirect({
  institution: "XREG",
  identifier: "GAVOFYORK"
});
console.log(i.toString()); // "XE81ETHXREGGAVOFYORK"

chain3.mc.iban.isValid 

var valid = chain3.mc.iban.isValid("XE81ETHXREGGAVOFYORK");
console.log(valid); // true

var valid2 = chain3.mc.iban.isValid("XE82ETHXREGGAVOFYORK");
console.log(valid2); // false, cause checksum is incorrect

var i = new chain3.mc.iban("XE81ETHXREGGAVOFYORK");
var valid3 = i.isValid();
console.log(valid3); // true

chain3.mc.iban.isDirect 

var i = new chain3.mc.iban("XE81ETHXREGGAVOFYORK");
var direct = i.isDirect();
console.log(direct); // false

chain3.mc.iban.isIndirect 

var i = new chain3.mc.iban("XE81ETHXREGGAVOFYORK");
var indirect = i.isIndirect();
console.log(indirect); // true

chain3.mc.iban.checksum 

var i = new chain3.mc.iban("XE81ETHXREGGAVOFYORK");
var checksum = i.checksum();
console.log(checksum); // "81"

chain3.mc.iban.institution 

var i = new chain3.mc.iban("XE81ETHXREGGAVOFYORK");
var institution = i.institution();
console.log(institution); // 'XREG'

chain3.mc.iban.client 

var i = new chain3.mc.iban("XE81ETHXREGGAVOFYORK");
var client = i.client();
console.log(client); // 'GAVOFYORK'

chain3.mc.iban.address 

var i = new chain3.mc.iban('XE7338O073KYGTWWZN0F2WZ0R8PX5ZPPZS');
var address = i.address();
console.log(address); // '00c5496aee77c1ba1f0854206a26dda82a81d6d8'

chain3.mc.iban.toString 

var i = new chain3.mc.iban('XE7338O073KYGTWWZN0F2WZ0R8PX5ZPPZS');
console.log(i.toString()); // 'XE7338O073KYGTWWZN0F2WZ0R8PX5ZPPZS'