Blockchain as a Service:Event Interface

Subscribe to account events

You can call the event.account operation to subscribe to account events.

Request parameters

The following parameters are encapsulated and passed in as an object.

Examples

// Create an event instance
const contractEvent = chain.event.contract({
  to: 'first'
}, (err, data) => {
  console.log(data)
})
// Register the event callback
contractEvent.on((err, data) => {
  console.log(data)
})
// Update the contract code
chain.ctr.contract('first').update(bytecode, {}, (err, contract, data) => {})

Cancel the subscription of account events

You can call the accountEvent.close operation to cancel the subscription of account events. This operation does not require any request parameters.

Examples

// Create an event instance
const accountEvent = chain.event.account({
  to: 'Tester001'
}, (err, data) => {
  console.log(data)
})
// Cancel the event
accountEvent.close((err, data) => {
  console.log(data)
})

Subscribe to contract events

You can call the event.contract operation to subscribe to contract events.

Request parameters

The following parameters are encapsulated and passed in as an object.

Examples

// Create an event instance
const contractEvent = chain.event.contract({
  to: 'first'
}, (err, data) => {
  console.log(data)
})
// Register the event callback
contractEvent.on((err, data) => {
  console.log(data)
})
// Update the contract code
chain.ctr.UpdateContract({
  to: 'first',
  data: {
    code: bytecode
  }
}, (err, data, rlpData) => {})

Unsubscribe contract events

You can call the contractEvent.close operation to unsubscribe account events. This operation does not require any request parameters.

Examples

// Create an event instance
const contractEvent = chain.event.contract({
  to: 'first'
}, (err, data) => {
  console.log(data)
})
// Unsubscribe the event
contractEvent.close((err, data) => {
  console.log(data)
})

Subscribe to topic events

You can call the event.topic operation to subscribe to topic events.

Request parameters

The following parameters are encapsulated and passed in as an object.

Examples

// Create an event instance
const topicEvent = chain.event.topic({
  to: 'create_account'
}, (err, data) => {
  console.log(data)
})
// Register the event callback
topicEvent.on((err, data) => {
  console.log(data)
})
// Run CreateAccount to trigger the create_account topic event
chain.ctr.CreateAccount({
  from: 'Tester001',
  to: 'Tester002',
  data: {
    recover_key: '0xf5e50510a04a3f659a0e89f2063f79f8c1aed5ddaab6420ac47700020d9889dc14dae4dc9843c88d8222167095d9e6ce052e8a19cbc737c3f3cddf66409dbb0a',
    auth_key: '0xf5e50510a04a3f659a0e89f2063f79f8c1aed5ddaab6420ac47700020d9889dc14dae4dc9843c88d8222167095d9e6ce052e8a19cbc737c3f3cddf66409dbb0a',
    auth_weight: 100
  }
}, (err, data) => {})

Unsubscribe topic events

You can call the topicEvent.close operation to unsubscribe topic events. This operation does not require any request parameters.

Examples

// Create an event instance
const topicEvent = chain.event.topic({
  to: 'create_account'
}, (err, data) => {
  console.log(data)
})
// Unsubscribe the event
topicEvent.close((err, data) => {
  console.log(data)
})

Subscribe to block events

You can call the event.block operation to subscribe to contract events. This operation requires no request parameters.

Examples

// Create an event instance
const blockEvent = chain.event.block({}, (err, data) => {
  console.log(data)
})
// Register the event callback to trigger the event while generating the block
blockEvent.on((err, data) => {
  console.log(data)
})

Unsubscribe block events

You can call the blockEvent.close operation to unsubscribe topic events. This operation does not require any request parameters.

Examples

// Create an event instance
const blockEvent = chain.event.block({}, (err, data) => {
  console.log(data)
})
// Unsubscribe the event
blockEvent.close((err, data) => {
  console.log(data)
})