VECHAIN Docs
Search
⌃K

API Specification

Connex.Thor

Get Genesis Block Info

Returns Thor.Block​
console.log(connex.thor.genesis)
​
>{
"beneficiary": "0x0000000000000000000000000000000000000000",
"gasLimit": 10000000,
"gasUsed": 0,
"id": "0x000000000b2bce3c70bc649a02749e8687721b09ed2e15997f466536b20bb127",
"number": 0,
"parentID": "0xffffffff00000000000000000000000000000000000000000000000000000000",
"receiptsRoot": "0x45b0cfc220ceec5b7c1c62c4d4193d38e4eba48e8815729ce75f9c0ab0e4c1c0",
"signer": "0x0000000000000000000000000000000000000000",
"size": 170,
"stateRoot": "0x4ec3af0acbad1ae467ad569337d2fe8576fe303928d35b8cdd91de47e9ac84bb",
"timestamp": 1530014400,
"totalScore": 0,
"transactions": [],
"txsRoot": "0x45b0cfc220ceec5b7c1c62c4d4193d38e4eba48e8815729ce75f9c0ab0e4c1c0"
}

Get Blockchain Status

Returns Thor.Status​
console.log(connex.thor.status)
​
>{
"head": {
"id": "0x00d801f2b19ece57b722f5a45ee4d0569201e81d40c3efccbf911613be98c05f",
"number": 14156274,
"timestamp": 1671594090,
"parentID": "0x00d801f12541216d63e6e631ab4f2702b11463e649a33120e5a70ff101042e31",
"txsFeatures": 1,
"gasLimit": 30000000
},
"progress": 1,
"finalized": "0x00d7ffdc678fb95d20f9484d9e45966a0db49a2d83222344e005963f3ed76faa"
}

Create a Ticker

Ticker is a concept that describes chain increment, when there is a new block added to the chain, ticker will be triggered. This API will create a ticker which has a function that creates a Promise that will resolve when a new block is truly added, please be advised that it never rejects.
Returns Thor.Ticker
const ticker = connex.thor.ticker()
ticker.next().then((head)=>{
console.log(head)
})
​
// After a few seconds
> {
"id": "0x00379f79ce016975dab2aa6ee21669b6ad4f4aa3fbb1ef1dfb151c52e13a8437",
"number": 3645305,
"parentID": "0x00379f781a0035250669e6f5e5170b8cb384decbbb6a83917f823d920de5eed1",
"timestamp": 1566874740,
"txsFeatures": 1,
"gasLimit": 16000000
}

Account Visitor

Account visitor is a bunch of APIs to get account details and interact with account methods.
Create an Account Visitor
const acc = connex.thor.account('0x7567d83b7b8d80addcb281a71d54fc7b3364ffed')
Parameters
  • address - string: Account to visit
Returns AccountVisitor
  • address - string(readonly): The address of account to be visited
  • get - (): Promise<Thor.Account>: Get the account detail
  • getCode - (): Promise<Thor.Account>: Get the account code
  • getStorage - (key: string): Promise<Thor.Account>: Get the account storage
  • method - (abi: object): Method: Create a method object, to perform contract call, or build transaction clause
  • event - (abi: object): EventVisitor: Create an event visitor
Get Account Detail
const acc = connex.thor.account('0x7567d83b7b8d80addcb281a71d54fc7b3364ffed')
acc.get().then(accInfo=>{
console.log(accInfo)
})
​
>{
"balance": "0xe95ea52e8e07eddd24e",
"energy": "0x920d91d3ff3bb7f1d527",
"hasCode": false
}
Get Account Code
Returns Promise<Thor.Code>
  • code - string: Contract code of an account
const acc = connex.thor.account('0x0000000000000000000000000000456E65726779')
acc.getCode().then(code=>{
console.log(code)
})
​
>{
"code": "0x6080604052600436106100af576000357c010000000000000000000000000000000000..."
}
Get Account Storage
Parameters
  • key - string: The key to accessing in account storage
Returns Promise<Thor.Storage>
  • value - string: The value to the key in account storage
const acc = connex.thor.account('0x0000000000000000000000000000456E65726779')
acc.getStorage('0x0000000000000000000000000000000000000000000000000000000000000001').then(storage=>{
console.log(storage)
})
​
>{
"value": "0x7107c9b15a7254dd92173d5421359b33bf40ea4ef0fa278ceaf1d320659d5c7b..."
}
Contract Method
Given the ABI of a contract, a Thor.Method object can be created to simulate a contract all without altering the contract state as well as pack a method with arguments to a clause that is ready to be signed.
const nameABI = {"constant":true,"inputs":[],"name":"name","outputs":[{"name":"","type":"string"}],"payable":false,"stateMutability":"pure","type":"function"}
​
const acc = connex.thor.account('0x0000000000000000000000000000456E65726779')
const method = acc.method(nameABI)
Parameters
  • abi - object: ABI definition of a contract method
Returns Thor.Method
  • value - (val: string|number):this: Set value for call and as Clause
  • caller - (addr: string):this: Set caller for call
  • gas - (gas: string):this: Set maximum gas allowed for call
  • gasPrice - (gp: string):this: Set gas price for call in wei
  • gasPayer - (addr: string):this: Set gas payer for call
  • call: Simulate calling the method to obtain the output without altering the blockchain state
  • asClause: Pack arguments and value into a clause
  • transact: Pack arguments and value into an Vendor.TxSigningService for committing to the blockchain
Simulate a Contract Call
Method.call(...arguments: Array<any>): Promise<VM.Output&Decoded>
Parameters
  • ...arguments - Array<any>: Arguments defined in method ABI
Decoded will be present only the ABI definition is provided
// Simulate get name from a VIP-180 compatible contract
// Solidity: function name() public pure returns(string)
const nameABI = {"constant":true,"inputs":[],"name":"name","outputs":[{"name":"","type":"string"}],"payable":false,"stateMutability":"pure","type":"function"}
const nameMethod = connex.thor.account('0x0000000000000000000000000000456E65726779').method(nameABI)
nameMethod.call().then(output=>{
console.log(output)
})
>{
"data": "0x0000000000000000000000...",
"events": [],
"transfers": [],
"gasUsed": 605,
"reverted": false,
"vmError": "",
"decoded": {
"0": "VeThor"
}
}
​
// Simulate the VIP-180 transfer 1 wei token from Alex to Bob
// Solidity: function transfer(address _to, uint256 _amount) public returns(bool success)
const transferABI = {"constant":false,"inputs":[{"name":"_to","type":"address"},{"name":"_amount","type":"uint256"}],"name":"transfer","outputs":[{"name":"success","type":"bool"}],"payable":false,"stateMutability":"nonpayable","type":"function"}
const transferMethod = connex.thor.account('0x0000000000000000000000000000456E65726779').method(transferABI)
// Set the args for simulate call
transferMethod
.caller('0x7567d83b7b8d80addcb281a71d54fc7b3364ffed') // Bob's address
.gas(100000) // Max gas for simulate
.gasPrice('1000000000000000') // 1 VeThor can buy 1000 gas
​
// Alice's address and amount in wei
transferMethod.call('0xd3ae78222beadb038203be21ed5ce7c9b1bff602', 1).then(output=>{
console.log(output)
})
>{
"data": "0x0000000000000000000000000000000000000000000000000000000000000001",
"events": [
{
"address": "0x0000000000000000000000000000456e65726779",
"topics": [
"0xddf252ad1be2c89b69c2b068fc378daa952ba7f163c4a11628f55a4df523b3ef",
"0x0000000000000000000000007567d83b7b8d80addcb281a71d54fc7b3364ffed",
"0x000000000000000000000000d3ae78222beadb038203be21ed5ce7c9b1bff602"
],
"data": "0x0000000000000000000000000000000000000000000000000000000000000001"
}
],
"transfers": [],
"gasUsed": 13326,
"reverted": false,
"vmError": "",
"decoded": {
"0": true,
"success": true
}
}
​
// Simulate EnergyStation convertForEnergy call
// Solidity: function convertForEnergy(uint256 _minReturn) public payable
const convertForEnergyABI = {"constant":false,"inputs":[{"name":"_minReturn","type":"uint256"}],"name":"convertForEnergy","outputs":[{"name":"","type":"uint256"}],"payable":true,"stateMutability":"payable","type":"function"}
const convertForEnergyMethod = connex.thor.account('0xd015d91b42bed5feaf242082b11b83b431abbf4f').method(convertForEnergyABI)
// Set value, leave other arguments unset
convertForEnergyMethod
.value('1000000000000000000') // 1e18 wei
​
// minReturn in wei(1e16 wei)
convertForEnergyMethod.call('10000000000000000').then(output=>{
console.log(output)
})
> ...
Caching a Contract Call
Quote
There are only two hard things in Computer Science: cache invalidation and naming things.
-- Phil Karlton
Caching method calls would help developers to speed up their applications. Addresses are ideal to be the conditions of the cache invalidation because they are building states in smart contracts. We recommend developers use this caching mechanism carefully since it is primitive.
Method.cache(hints: Array<string>): this
Parameters
  • hints - Array<string>: Turn on caching for the method and set the condition of cache invalidation.
After turning cache on, connex will check everything on the blockchain that can be treated as address(included but not limited to):
  • Block.Signer
  • Block.Beneficiary
  • Transaction.Signer
  • Receipt.GasPayer
  • Receipt.Output.Event.Address
  • Receipt.Output.Event.ContractAddress
  • Receipt.Output.Event.Topics
  • Receipt.Output.Transfer.Sender
  • Receipt.Output.Transfer.Recipient
Once any address in the set is observed by connex, the cache would be expired.
// Caching for method name, return value should never expire
// Solidity: function name() public pure returns(string)
const nameABI = {"constant":true,"inputs":[],"name":"name","outputs":[{"name":"","type":"string"}],"payable":false,"stateMutability":"pure","type":"function"}
const nameMethod = connex.thor.account('0x0000000000000000000000000000456E65726779').method(nameABI)
nameMethod.cache([]) // Set this method to never expire
nameMethod.call().then(output=>{
console.log(output)
}) // This will hit cache forever
​
// Caching for method balanceOf, for my addresses
// Solidity function balanceOf(address _owner) public view returns(uint256 balance)
const balanceOfABI = {"constant":true,"inputs":[{"name":"_owner","type":"address"}],"name":"balanceOf","outputs":[{"name":"balance","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"}
const balanceOfMethod = connex.thor.account('0x0000000000000000000000000000456E65726779').method(balanceOfABI)
// Set this method to expire when my account being seen
balanceOfMethod.cache(['0x7567d83b7b8d80addcb281a71d54fc7b3364ffed'])
// Get balance of my account, we will get cached result on most blocks
// Event Transfer(_from = '0x7567d83b7b8d80addcb281a71d54fc7b3364ffed', ....) would make cache expired
balanceOfMethod.call('0x7567d83b7b8d80addcb281a71d54fc7b3364ffed').then(output=>{
console.log(output)
})
​
// Caching a DEX market's vet balance
// Solidity: function vetVirtualBalance() public returns(bool uint104)
const vetBalanceABI = {"constant":true,"inputs":[],"name":"vetVirtualBalance","outputs":[{"name":"","type":"uint104"}],"payable":false,"stateMutability":"view","type":"function"}
const vetBalanceMethod = connex.thor.account('0xD015D91B42BEd5FeaF242082b11B83B431abBf4f').method(vetBalanceABI)
// Set this method to expire when the contract address being seen
// Why? Because I am the developer of EnergyStation and I know the detail of the contract
// vetVirtualBalance changes when there is any conversion executed and every conversion would trigger an event
// and every event's output will contain contractAddress, so I set the contractAddress to the condition
vetBalanceMethod.cache(['0xD015D91B42BEd5FeaF242082b11B83B431abBf4f'])
vetBalanceMethod.call('0xD015D91B42BEd5FeaF242082b11B83B431abBf4f').then(output=>{
console.log(output)
})// This will get the vetVirtualBalance efficiently
Commit to blockchain
Method.transact(...arguments: Array<any>): Vendor.TxSigningService
Parameters
  • ...arguments - Array<any>: Arguments defined in method ABI
// Perform a VIP-180 transfer 1 wei token from Alex to Bob
// Solidity: function transfer(address _to, uint256 _amount) public returns(bool success)
const transferABI = {"constant":false,"inputs":[{"name":"_to","type":"address"},{"name":"_amount","type":"uint256"}],"name":"transfer","outputs":[{"name":"success","type":"bool"}],"payable":false,"stateMutability":"nonpayable","type":"function"}
const transferMethod = connex.thor.account('0x0000000000000000000000000000456E65726779').method(transferABI)
​
transferMethod
// Bob's address and amount in wei
.transact('0xd3ae78222beadb038203be21ed5ce7c9b1bff602', 1)
.comment('transfer 1 wei to Alice')
.request()
.then(result=>{
console.log(result)
})
>{
"signer": "0x7567d83b7b8d80addcb281a71d54fc7b3364ffed",
"txId": "0x4e9a7eec33ef6cfff8ff5589211a94070a0284df17c2ead6267f1913169bd340"
}
​
// Converts 1 VET to VeThor
// Solidity: function convertForEnergy(uint256 _minReturn) public payable
const convertForEnergyABI = {"constant":false,"inputs":[{"name":"_minReturn","type":"uint256"}],"name":"convertForEnergy","outputs":[{"name":"","type":"uint256"}],"payable":true,"stateMutability":"payable","type":"function"}
const convertForEnergyMethod = connex.thor.account('0x0000000000000000000000000000456E65726779').method(convertForEnergyABI)
​
convertForEnergyMethod
.value('1000000000000000000') // Set value to 1e18
.transact('10000000000000000') // minReturn in wei(1e16 wei)
.comment('Convert 1 VET to VeThor')
.request()
.then(result=>{
console.log(result)
})
>{
"signer": "0x7567d83b7b8d80addcb281a71d54fc7b3364ffed",
"txId": "0x4e9a7eec33ef6cfff8ff5589211a94070a0284df17c2ead6267f1913169bd340"
}
Create a Clause for Signing
Method.asClause(...arguments: Array<any>): VM.Clause
Parameters
  • ...arguments - Array<any>: Arguments defined in method ABI
Returns VM.Clause​
// Convert 1 VeThor to VET, which needs to perform two action approve VeThor and convertForVET
const dex = '0xD015D91B42BEd5FeaF242082b11B83B431abBf4f'
const approveABI = {"constant":false,"inputs":[{"name":"_spender","type":"address"},{"name":"_value","type":"uint256"}],"name":"approve","outputs":[{"name":"success","type":"bool"}],"payable":false,"stateMutability":"nonpayable","type":"function"}
const approveMethod = connex.thor.account('0x0000000000000000000000000000456E65726779').method(approveABI)
const convertForVetABI= {"constant":false,"inputs":[{"name":"_sellAmount","type":"uint256"},{"name":"_minReturn","type":"uint256"}],"name":"convertForVET","outputs":[{"name":"","type":"uint256"}],"payable":false,"stateMutability":"nonpayable","type":"function"}
const convertForVetMethod = connex.thor.account(dex).method(convertForVetABI)
​
// approve dex to move my 1e18 wei VeThor
const c1 = approveMethod.asClause(dex, '1000000000000000000')
// convert 1e18 wei VeThor to VET, minimum return at 1e16 wei VET
const c2 = convertForVetMethod.asClause('1000000000000000000', '10000000000000000')
​
connex.vendor
.sign('tx', [c1, c2])
.comment('convert 1 VeThor to VET')
.request()
.then(result=>{
console.log(result)
})
​
>{
"to": "0x0000000000000000000000000000456E65726779",
"value": "0",
"data": "0xa9059cb......"
}
Contract Event
Given the ABI of a contract, we can create a Thor.Event object that will be able to filter contracts events with arguments or pack the arguments to criteria for assembling combined filters.
const transferEventABI = {"anonymous":false,"inputs":[{"indexed":true,"name":"_from","type":"address"},{"indexed":true,"name":"_to","type":"address"},{"indexed":false,"name":"_value","type":"uint256"}],"name":"Transfer","type":"event"}
const acc = connex.thor.account('0x0000000000000000000000000000456E65726779')
​
const event = acc.event(transferEventABI)
Parameters
  • abi - object: ABI definition of contract event
Returns Thor.Event
  • asCriteria: Pack indexed arguments into criteria for future use, see Thor.Filter​
  • filter: Create an event filter, only accept indexed arguments, see Thor.Filter​
Pack into Criteria
Event.asCriteria(indexed: object): Thor.Filter.Criteria
Parameters
  • indexed - object: Indexed arguments defined in event ABI that needs to be filtered, the items in the object will be combined with AND operator: e.g. {"ConA": "A", "ConB": "B"} is 'ConA=A AND ConB=B'
Returns Thor.Filter.Criteria
// Solidity: event Transfer(address indexed _from, address indexed _to, uint256 _value)
const transferEventABI = {"anonymous":false,"inputs":[{"indexed":true,"name":"_from","type":"address"},{"indexed":true,"name":"_to","type":"address"},{"indexed":false,"name":"_value","type":"uint256"}],"name":"Transfer","type":"event"}
const transferEvent = connex.thor.account('0x0000000000000000000000000000456E65726779').event(transferEventABI)
​
// Pack into criteria filters events that the '_to' is Bob's address
const criteria = transferEvent.asCriteria({
_to: '0xd3ae78222beadb038203be21ed5ce7c9b1bff602'
})
console.log(criteria)
>{
"address": "0x0000000000000000000000000000456E65726779",
"topic0": "0xddf252ad1be2c89b69c2b068fc378daa952ba7f163c4a11628f55a4df523b3ef",
"topic2": "0x000000000000000000000000d3ae78222beadb038203be21ed5ce7c9b1bff602"
}
// Next you can combine different criteria together and put them into filter
Create a filter
Event.filter(indexed: object): Thor.Filter
Parameters
  • indexed - Array<object>: Array of filter conditions of indexed arguments, the items in the array will be combined by OR operator to filter the events: e.g. [{"ConA": "A"}, {"ConB": "B", "ConC": "C"}] is 'ConA=A OR (ConB=B AND ConC=C)'
Returns Thor.Filter​
// Solidity: event Transfer(address indexed _from, address indexed _to, uint256 _value)
const transferEventABI = {"anonymous":false,"inputs":[{"indexed":true,"name":"_from","type":"address"},{"indexed":true,"name":"_to","type":"address"},{"indexed":false,"name":"_value","type":"uint256"}],"name":"Transfer","type":"event"}
const transferEvent = connex.thor.account('0x0000000000000000000000000000456E65726779').event(transferEventABI)
​
// Filter the events whether '_to' is Bob's address or '_from' is Alice's address
const filter = transferEvent.filter([{
_to: '0xd3ae78222beadb038203be21ed5ce7c9b1bff602'
},{
_from: '0x733b7269443c70de16bbf9b0615307884bcc5636'
}])
// Next you can call the methods of Thor.Filter
Execute the filter
Filter.apply(offset:number, limit: number): Promise<Array<Thor.Filter.Result.Log&Decoded>>
Decoded will be present only the ABI definition is provided
// Solidity: event Transfer(address indexed _from, address indexed _to, uint256 _value)
const transferEventABI = {"anonymous":false,"inputs":[{"indexed":true,"name":"_from","type":"address"},{"indexed":true,"name":"_to","type":"address"},{"indexed":false,"name":"_value","type":"uint256"}],"name":"Transfer","type":"event"}
const transferEvent = connex.thor.account('0x0000000000000000000000000000456E65726779').event(transferEventABI)
​
// Create a filter from eventABI
const filter = transferEvent.filter([{
_to: '0xd3ae78222beadb038203be21ed5ce7c9b1bff602'
}])
​
// Apply the filter, get the first one
filter.apply(0, 1).then(logs=>{
console.log(logs)
})
>[
{
"address": "0x0000000000000000000000000000456e65726779",
"topics": [
"0xddf252ad1be2c89b69c2b068fc378daa952ba7f163c4a11628f55a4df523b3ef",
"0x0000000000000000000000007567d83b7b8d80addcb281a71d54fc7b3364ffed",
"0x00000000000000000000000000f34f4462c0f6a6f5e76fb1b6d63f05a32ed2c6"
],
"data": "0x0000000000000000000000000000000000000000000000000de0b6b3a7640000",
"meta": {
"blockID": "0x0000813fbe48421dfdc9400f1f4e1d67ce34256538afd1c2149c4047d72c4175",
"blockNumber": 33087,
"blockTimestamp": 1530345270,
"txID": "0x29b0af3ffb8eff4cc48a24ce9a800aaf4d0e92b72dbcf17ce01b14fd01af1290",
"txOrigin": "0x7567d83b7b8d80addcb281a71d54fc7b3364ffed",
"clauseIndex": 0
},
"decoded": {
"0": "0x7567D83b7b8d80ADdCb281A71d54Fc7B3364ffed",
"1": "0x00F34f4462c0f6a6f5E76Fb1b6D63F05A32eD2C6",
"2": "1000000000000000000",
"_from": "0x7567D83b7b8d80ADdCb281A71d54Fc7B3364ffed",
"_to": "0x00F34f4462c0f6a6f5E76Fb1b6D63F05A32eD2C6",
"_value": "1000000000000000000"
}
}
]

Block Visitor

const blk = connex.thor.block(0)
Parameters
  • revision - number|string|undefined: Block number or ID to visit or leave it unset the function will get the latest block ID as the revision (As long as the revision is set, it can't be changed again)
Returns Thor.BlockVisitor
  • revision - number|string(readonly): Block number or ID to be visited.
Get Block Detail
const blk=connex.thor.block(0)
​
blk.get().then(block=>{
console.log(block)
})
>{
"number": 0,
"id": "0x000000000b2bce3c70bc649a02749e8687721b09ed2e15997f466536b20bb127",
"size": 170,
"parentID": "0xffffffff00000000000000000000000000000000000000000000000000000000",
"timestamp": 1530014400,
"gasLimit": 10000000,
"beneficiary": "0x0000000000000000000000000000000000000000",
"gasUsed": 0,
"totalScore": 0,
"txsRoot": "0x45b0cfc220ceec5b7c1c62c4d4193d38e4eba48e8815729ce75f9c0ab0e4c1c0",
"stateRoot": "0x4ec3af0acbad1ae467ad569337d2fe8576fe303928d35b8cdd91de47e9ac84bb",
"receiptsRoot": "0x45b0cfc220ceec5b7c1c62c4d4193d38e4eba48e8815729ce75f9c0ab0e4c1c0",
"signer": "0x0000000000000000000000000000000000000000",
"isTrunk": true,
"transactions": []
}

Transaction Visitor

const tx = connex.thor.transaction('0x9daa5b584a98976dfca3d70348b44ba5332f966e187ba84510efb810a0f9f851')
Parameters
  • id - string: Transaction ID to be visited (As long as the revision is set, it can't be changed again)
Returns Thor.TransactionVisitor
  • id - number|string(readonly): Block number or ID to be visited
  • get - (): Promise<Thor.Transaction>: Get the transaction detail
  • getReceipt - (): Promise<Thor.Receipt>: Get the transaction receipt
Get Transaction Detail
Returns Thor.Transaction​
const transaction=connex.thor.transaction('0x9daa5b584a98976dfca3d70348b44ba5332f966e187ba84510efb810a0f9f851')
​
transaction.get().then(tx=>{
console.log(tx)
})
>{
"id": "0x9daa5b584a98976dfca3d70348b44ba5332f966e187ba84510efb810a0f9f851",
"chainTag": 39,
"blockRef": "0x00003abac0432454",
"expiration": 720,
"clauses": [
{
"to": "0x7567d83b7b8d80addcb281a71d54fc7b3364ffed",
"value": "0x152d02c7e14af6800000",
"data": "0x"
}
],
"gasPriceCoef": 128,
"gas": 21000,
"origin": "0xe59d475abe695c7f67a8a2321f33a856b0b4c71d",
"nonce": "0x12256df6fb",
"dependsOn": null,
"size": 128,
"meta": {
"blockID": "0x00003abbf8435573e0c50fed42647160eabbe140a87efbe0ffab8ef895b7686e",
"blockNumber": 15035,
"blockTimestamp": 1530164750
}
}
Get Transaction Receipt
const tx = connex.thor.transaction('0x9daa5b584a98976dfca3d70348b44ba5332f966e187ba84510efb810a0f9f851')
const receipt = await tx.getReceipt()
Returns Thor.Receipt​
const transaction=connex.thor.transaction('0x9daa5b584a98976dfca3d70348b44ba5332f966e187ba84510efb810a0f9f851')
​
transaction.getReceipt().then(tx=>{
console.log(tx)
})
>{
"gasUsed": 21000,
"gasPayer": "0xe59d475abe695c7f67a8a2321f33a856b0b4c71d",
"paid": "0x1b5b8c4e33f51f5e8",
"reward": "0x835107ddc632302c",
"reverted": false,
"meta": {
"blockID": "0x00003abbf8435573e0c50fed42647160eabbe140a87efbe0ffab8ef895b7686e",
"blockNumber": 15035,
"blockTimestamp": 1530164750,
"txID": "0x9daa5b584a98976dfca3d70348b44ba5332f966e187ba84510efb810a0f9f851",
"txOrigin": "0xe59d475abe695c7f67a8a2321f33a856b0b4c71d"
},
"outputs": [
{
"contractAddress": null,
"events": [],
"transfers": []
}
]
}

Filter

Filter event and transfer logs on the blockchain. Filter often works with Connex.Thor.Account, either creates a filter from an event or packs criteria and then assembles several criteria and sets to a filter. But also there is a way of creating a filter and assembling criteria as per your need then apply it.
const f = connex.thor.filter(kind: 'event'|'transfer', criteria: Array<Thor.Filter.Criteria>)
Parameters
  • kind - 'event'|'transfer': Kind of filter
  • criteria - Array<Thor.Filter.Criteria>: Criteria set for the filter, either array of Event.Criteria or an array of Transfer.Criteria, items in the criteria array will be combined by OR operator to filter the events: e.g. [{"ConA": "A"}, {"ConB": "B", "ConC": "C"}] is 'ConA=A OR (ConB=B AND ConC=C)'
Thor.Filter.Criteria:
Filters support two different types of log: event and transfer so there are two types of Thor.Filter.Criteria.
Thor.Filter.Event.Criteria:
  • address - string(optional): The address to get logs from
  • topic0 - string(optional): Topic0 to match
  • topic1 - string(optional): Topic1 to match
  • topic2 - string(optional): Topic2 to match
  • topic3 - string(optional): Topic3 to match
  • topic4 - string(optional): Topic4 to match
Thor.Filter.Transfer.Criteria:
  • txOrigin - string(optional): Signer address of tx
  • sender - string(optional): VET sender address
  • recipient - string(optional): VET recipient address
Returns Thor.Filter
  • order - (order: 'asc'|'desc'): this: Set the order for filter
  • range - (range: Thor.Filter.Range): this: Set the range for the filter
  • apply - (offset: number, limit: number): Promise<Thor.Filter.Result>: Apply the filter and get the result
connex.thor.filter('event',[
// Matches VIP-180 Transfer from '0xd3ae78222beadb038203be21ed5ce7c9b1bff602'
{
"address": "0x0000000000000000000000000000456E65726779",
"topic0": "0xddf252ad1be2c89b69c2b068fc378daa952ba7f163c4a11628f55a4df523b3ef",
"topic1": "0x000000000000000000000000d3ae78222beadb038203be21ed5ce7c9b1bff602"
},
// Matches VIP-180 Transfer to '0x7567d83b7b8d80addcb281a71d54fc7b3364ffed'
{
"address": "0x0000000000000000000000000000456E65726779",
"topic0": "0xddf252ad1be2c89b69c2b068fc378daa952ba7f163c4a11628f55a4df523b3ef",
"topic2": "0x0000000000000000000000007567d83b7b8d80addcb281a71d54fc7b3364ffed"
}
])
// Next you can set other options or executes the filter
Set filter range
Parameters
Thor.Filter.Range:
  • unit - 'block'|'time': Range unit, can be filtered by block number or timestamp in second
  • from - Number: Start point in unit
  • to - Number: Stop point in unit
Returns this
const filter = connex.thor.filter('transfer')
​
// Set the filter range as block 0 to block 100
filter.range({
unit: 'block',
from: 0,
to: 100
})
// Next you can set other options or executes the filter
Execute the filter
Parameters
  • offset - Number: Start cursor in the result
  • limit - Number: Constrain the number of result returned
// Solidity: event Transfer(address indexed _from, address indexed _to, uint256 _value)
const transferEventABI = {"anonymous":false,"inputs":[{"indexed":true,"name":"_from","type":"address"},{"indexed":true,"name":"_to","type":"address"},{"indexed":false,"name":"_value","type":"uint256"}],"name":"Transfer","type":"event"}
const transferEvent = connex.thor.account('0x0000000000000000000000000000456E65726779').event(transferEventABI)
​
// Create a filter from eventABI
const filter = transferEvent.filter([{
_to: '0xd3ae78222beadb038203be21ed5ce7c9b1bff602'
}])
// Set filter options
filter
.order('desc') // Work from the last event
.range({
unit: 'block',
from: 10000,
to: 40000
}) // Set the range
// Apply the filter, get the first one
filter.apply(0, 1).then(logs=>{
console.log(logs)
})
>[
{
"address": "0x0000000000000000000000000000456e65726779",
"topics": [
"0xddf252ad1be2c89b69c2b068fc378daa952ba7f163c4a11628f55a4df523b3ef",
"0x0000000000000000000000007567d83b7b8d80addcb281a71d54fc7b3364ffed",
"0x00000000000000000000000000f34f4462c0f6a6f5e76fb1b6d63f05a32ed2c6"
],
"data": "0x0000000000000000000000000000000000000000000000000de0b6b3a7640000",
"meta": {
"blockID": "0x0000813fbe48421dfdc9400f1f4e1d67ce34256538afd1c2149c4047d72c4175",
"blockNumber": 33087,
"blockTimestamp": 1530345270,
"txID": "0x29b0af3ffb8eff4cc48a24ce9a800aaf4d0e92b72dbcf17ce01b14fd01af1290",
"txOrigin": "0x7567d83b7b8d80addcb281a71d54fc7b3364ffed",
"clauseIndex": 0
},
"decoded": {
"0": "0x7567D83b7b8d80ADdCb281A71d54Fc7B3364ffed",
"1": "0x00F34f4462c0f6a6f5E76Fb1b6D63F05A32eD2C6",
"2": "1000000000000000000",
"_from": "0x7567D83b7b8d80ADdCb281A71d54Fc7B3364ffed",
"_to": "0x00F34f4462c0f6a6f5E76Fb1b6D63F05A32eD2C6",
"_value": "1000000000000000000"
}
}
]
​
// Filter the transfer log that from 0x7567d83b7b8d80addcb281a71d54fc7b3364ffed
const filter = connex.thor.filter('transfer', [{
sender: '0x7567d83b7b8d80addcb281a71d54fc7b3364ffed'
}])
​
filter.apply(0,1).then(logs=>{
console.log(logs)
})
>[
{
"sender": "0x7567d83b7b8d80addcb281a71d54fc7b3364ffed",
"recipient": "0x3cc190d342a0d3a7365538d94adffec34f789cd0",
"amount": "0xde0b6b3a7640000",
"meta": {
"blockID": "0x00005be5d2129f01cb60ef20b43208091722bf6e0086ac24745cd26698e9d93d",
"blockNumber": 23525,
"blockTimestamp": 1530249650,
"txID": "0xd08e959c0ae918ab72d4da162856e7a4556c576b8ae849d09dbd38e5a419e94b",
"txOrigin": "0x7567d83b7b8d80addcb281a71d54fc7b3364ffed",
"clauseIndex": 0
}
}
]

Explainer

Explainer gets what would be produced after blockchain executes a tx, without committing to the blockchain.
const exp = connex.thor.explain([{
to: '0xd3ae78222beadb038203be21ed5ce7c9b1bff602',
value: 1,
data: '0x'
}])
Parameters
Returns Thor.Explainer
  • caller - (addr: string): this: Set caller
  • gas - (gas: number): this: Set max allowed gas
  • gasPrice - (gp: string): this: Set gas price in hex string
  • gasPayer - (addr: string):this: Set gas payer
  • cache - (hints: string[]): this: Turn on caching for the explainer and set the condition of cache invalidation, read more.
  • execute - (): Promise<Array<VM.Output>>: execute to get the output
Execute the explainer
// Prepare energy transfer clause
const transferABI = {"constant":false,"inputs":[{"name":"_to","type":"address"},{"name":"_amount","type":"uint256"}],"name":"transfer","outputs":[{"name":"success","type":"bool"}],"payable":false,"stateMutability":"nonpayable","type":"function"}
const transferMethod = connex.thor.account('0x0000000000000000000000000000456E65726779').method(transferABI)
// Alice's address and amount in wei
const energyClause = transferMethod.asClause('0xd3ae78222beadb038203be21ed5ce7c9b1bff602', 1)
​
const exp = connex.thor.explain([
{
to: '0xd3ae78222beadb038203be21ed5ce7c9b1bff602',
value: 1,
data: '0x'
},
energyClause
])
​
exp
.gas(200000) // Set maximum gas
.caller('0x7567d83b7b8d80addcb281a71d54fc7b3364ffed') // Set caller
.execute()
.then(outputs=>{
console.log(outputs)
})
>[
{
"data": "0x",
"events": [],
"transfers": [
{
"sender": "0x7567d83b7b8d80addcb281a71d54fc7b3364ffed",
"recipient": "0xd3ae78222beadb038203be21ed5ce7c9b1bff602",
"amount": "0x1"
}
],
"gasUsed": 0,
"reverted": false,
"vmError": ""
},
{
"data": "0x0000000000000000000000000000000000000000000000000000000000000001",
"events": [
{
"address": "0x0000000000000000000000000000456e65726779",
"topics": [
"0xddf252ad1be2c89b69c2b068fc378daa952ba7f163c4a11628f55a4df523b3ef",
"0x0000000000000000000000007567d83b7b8d80addcb281a71d54fc7b3364ffed",
"0x000000000000000000000000d3ae78222beadb038203be21ed5ce7c9b1bff602"
],
"data": "0x0000000000000000000000000000000000000000000000000000000000000001"
}
],
"transfers": [],
"gasUsed": 13326,
"reverted": false,
"vmError": ""
}
]

Connex.Vendor

Acquire a Signing Service

Vendor.sign(kind: 'tx'|'cert', msg: Array<TxMessage|CertMessage>): TxSigningService|CertSigningService
Parameters
  • kind - 'tx'|'cert': Kind of signing service
  • msg - Array<TxMessage|CertMessage>: Message to sign
TxMessage:
  • to: Same as VM.Clause.To​
  • value: Same as VM.Clause.Value​
  • data: Same as VM.Clause.Data​
  • comment - string(optional): Comment to the clause
  • abi - object(optional): ABI definition of this clause, for User-Agent decoding the data
CertMessage:
  • purpose - 'identification' | 'agreement': Purpose of the request, identification means request the user to sign a random message to get the address and agreement means ask user to sign the agreement for using the VeChain apps
  • payload:
    • type - 'text': Payload type,only text is supported
    • content - string: Content of of the request
Returns Connex.Vendor.TxSigningService or Connex.Vendor.CertSigningService

Transaction Signing Service

Connex.Vendor.TxSigningService:
  • signer - (addr: string): this: Enforces the specified address to sign the transaction
  • gas - (gas: number): this: Enforces the specified number as the maximum gas that can be consumed for the transaction
  • dependsOn - (txid: string): this: Set another txid as dependency (Reference)
  • link - (url: string): this: Set the link to reveal transaction-related information, the link will be used for connex to assemble a callback url by replacing the placeholder {txid} by Transaction ID
  • comment - (text: string): this: Set the comment for the transaction that will be revealed to the user
  • delegate - (url: string, signer: string): this: Enable VIP-191 by setting the url and the fee payer's address. Wallets(Sync2) will request fee payer's signature with the url and required parameters, read this to get the detail about building a VIP-191 service
  • accepted - (cb: ()=>void): this: Register a callback function which will be fired once user's wallet accepted the request
  • request - (): Promise<Connex.Vendor.TXResponse>: Perform the request
Perform Transaction Signing Request
Returns Promise<Connex.Vendor.TXResponse>:
  • txid - string: Transaction identifier
  • signer - string: Signer address
// Prepare energy transfer clause
const transferABI = {"constant":false,"inputs":[{"name":"_to","type":"address"},{"name":"_amount","type":"uint256"}],"name":"transfer","outputs":[{"name":"success","type":"bool"}],"payable":false,"stateMutability":"nonpayable","type":"function"}
const transferMethod = connex.thor.account('0x0000000000000000000000000000456E65726779').method(transferABI)
// Connex author's address and amount in wei
const energyClause = transferMethod.asClause('0xd3ae78222beadb038203be21ed5ce7c9b1bff602', '1000000000000000000000')
​
connex.vendor.sign('tx', [
{
to: '0xd3ae78222beadb038203be21ed5ce7c9b1bff602',
value: '100000000000000000000',
data: '0x',
comment: 'Transfer 100 VET'
},
{
comment: 'Transfer 1000 VeThor',
...energyClause
}
])
.signer('0x7567d83b7b8d80addcb281a71d54fc7b3364ffed') // Enforce signer
.gas(200000) // Set maximum gas
.link('https://connex.vecha.in/{txid}') // User will be back to the app by the url https://connex.vecha.in/0xffff....
.comment('Donate 100 VET and 1000 VeThor to the author of connex')
.request()
.then(result=>{
console.log(result)
})
>{
"signer": "0x7567d83b7b8d80addcb281a71d54fc7b3364ffed",
"txId": "0x4e9a7eec33ef6cfff8ff5589211a94070a0284df17c2ead6267f1913169bd340"
}
Perform a VIP-191 enabled request
const service = 'https://pay-tx-fee-for-you.vecha.in/requests'
const payer = '0x733b7269443c70de16bbf9b0615307884bcc5636'
​
connex.vendor.sign('tx',[{
to: '0xd3ae78222beadb038203be21ed5ce7c9b1bff602',
value: '100000000000000000000',
data: '0x',
comment: 'Transfer 100 VET'
}])
.delegate(service, payer)
.request().then(result=>{
console.log(result)
})
>{
"signer": "0x7567d83b7b8d80addcb281a71d54fc7b3364ffed",
"txId": "0x4e9a7eec33ef6cfff8ff5589211a94070a0284df17c2ead6267f1913169bd340"
}

Certificate Signing Service

The certificate is a message signing based mechanism which can easily request user's identification(address) or user to agree to your terms or agreements.
Connex.Vendor.CertSigningService:
  • signer - (addr: string): this: Enforces the specified address to sign the certificate
  • link - (url: string): this: Set the link to reveal certificate-related information, the link will be used for connex to assemble a callback url by replacing the placeholder {certid} by Certificate ID, which is computed by blake2b256(Certificate.encode(cert))
  • accepted - (cb: ()=>void): this: Register a callback function which will be fired once user's wallet accepted the request
  • request - (): Promise<Connex.Vendor.CertResponse>: Send the request
Perform Certificate Signing Request
Returns Promise<Connex.Vendor.CertResponse>:
  • annex:
    • domain - string: Domain of the VeChain apps
    • timestamp - number: Head block timestamp when user accepts the request
    • signer - string: Signer address
  • signature - string: Signature
connex.vendor.sign('cert',{
purpose: 'identification',
payload: {
type: 'text',
content: 'random generated string'
}
})
.link('https://connex.vecha.in/{certid}') // User will be back to the app by the url https://connex.vecha.in/0xffff....
.request()
.then(result=>{
console.log(result)
})
​
>{
"annex": {
"domain": "vechain.github.io",
"timestamp": 1545826680,
"signer": "0xf6e78a5584c06e2dec5c675d357f050a5402a730"
},
"signature": "0x30db85935f620f7c506462f3ec7552479a56db8cbd0c2a3f295a92ad4e2f37ae2d2b2a2a212c45c43eeaf6e5caa8b3348038c01192ed226d12a118f204c6729200"
}
​
// Ask user to sign the agreement
connex.vendor.sign('cert',{
purpose: 'agreement',
payload: {
type: 'text',
content: 'agreement'
}
})
.request()
.then(result=>{
console.log(result)
})
​
>{
"annex": {
"domain": "vechain.github.io",
"timestamp": 1545826770,
"signer": "0xf6e78a5584c06e2dec5c675d357f050a5402a730"
},
"signature": "0x2078a8a2fdfa61df579516162d373cd18b889fc5cb5c5ab51f4e1d71b21742ec6a8072f645502c82bf997529a126bcaefd38df385a079c94f9b2fd03b546aa1400"
}

Types

Thor.Status

  • progress - number: A number [0-1] indicates the syncing progress of the currently connected node
  • head: Summarized block info that indicates the head block of the currently connected node
    • id - string: Identifier of the block (bytes32)
    • number - number: Number of the block
    • timestamp - number: Unix timestamp of the block
    • parentID - string: ID of the parent block (bytes32)
    • txFeatures - number: Bitset of supported txs features
    • gasLimit - number: Block gaslimit
  • finalized - string: Identifier of the finalized block (bytes32)

Thor.Block

  • id - string: Identifier of the block (bytes32)
  • number - number: Number of block
  • parentID - string: ID of parent block (bytes32)
  • timestamp - number: Unix timestamp of block
  • gasLimit - number: Gas limit of the block
  • beneficiary - string: Address of account to receive block reward
  • gasUsed - number: Actual gas used of block
  • totalScore - number: Score of the main chain
  • txRoot - string: Root hash of transaction in the block (bytes32)
  • stateRoot - string: Root hash of state (bytes32)
  • signer - string: Address of who signed the block (bytes20)
  • transactions - Array<string>: Array of transaction IDs
  • isTrunk - bool: Whether the block is in trunk
  • txFeatures - number: Bitset of supported txs features

Thor.Account