How to turn off EventEmitter?

[oadamovskyi]

Hey

I am curious whether it is possible and how to turn off EventEmitter.

1. I expected to setup agnet.events.on<ProofStateChangedEvent>(ProofEventTypes.ProofStateChanged...
2. Then request proof, recieve it with state "request-received"
3. After that turn off agent.events.off<ProofStateChangedEvent>
4. And next time when requesting proof it will omit the listener

Unfortunately, I have not got that behaviour

[TimoGlastra]

Can you show the full code of calling on and off methods?

[oadamovskyi]

Somehow like that. It is quite messy as it is playground, so take my apologize in advance

holder1.agent.events.on<ProofStateChangedEvent>(ProofEventTypes.ProofStateChanged, ({ payload }) => {
                        console.log(`PROOF RECORD STATE: ${payload.proofRecord.state}`)        
                      })

                    console.log('First proof request');
                    
                    issuer1.agent.proofs.createRequest({
                        protocolVersion: "v1",
                        proofFormats: {
                            indy:{
                                requestedAttributes: map
                            }
                        }
                    }).then(proof => {
                        issuer1.agent.oob.createLegacyConnectionlessInvitation({
                            recordId: proof.proofRecord.id,
                            domain: "https://google.com",
                            message: proof.message
                            
                        }).then(res => {
                            holder1.agent.receiveMessage(res.message.toJSON()).then(invitation => {
                            })
                            
                        })
                    })

                    holder1.agent.events.off<ProofStateChangedEvent>(ProofEventTypes.ProofStateChanged, ({ payload }) => {
                        console.log(`Event listener turned off`)        
                      })
                      console.log('Second Proof Request');
                    
                      issuer1.agent.proofs.createRequest({
                        protocolVersion: "v1",
                        proofFormats: {
                            indy:{
                                requestedAttributes: map
                            }
                        }
                    }).then(proof => {
                        issuer1.agent.oob.createLegacyConnectionlessInvitation({
                            recordId: proof.proofRecord.id,
                            domain: "https://google.com",
                            message: proof.message
                            
                        }).then(res => {
                            holder1.agent.receiveMessage(res.message.toJSON()).then(invitation => {
                            })
                        })
                    })

[TimoGlastra]

You need to pass the same function to off as you pass to on. Currently you're passing a handler to off that's technically never registered. I think this should work:

function handler({ payload }: ProofStateChangedEvent) {
  console.log(`PROOF RECORD STATE: ${payload.proofRecord.state}`)        
                      })

                    console.log('First proof request');
                    
                    issuer1.agent.proofs.createRequest({
                        protocolVersion: "v1",
                        proofFormats: {
                            indy:{
                                requestedAttributes: map
                            }
                        }
                    }).then(proof => {
                       // call off here (or wherever you want)
                        holder1.agent.events.off<ProofStateChangedEvent>(ProofEventTypes.ProofStateChanged, handler)
                        issuer1.agent.oob.createLegacyConnectionlessInvitation({
                            recordId: proof.proofRecord.id,
                            domain: "https://google.com",
                            message: proof.message
                            
                        }).then(res => {
                         
                            holder1.agent.receiveMessage(res.message.toJSON()).then(invitation => {

                                      
                            })
                            
                        })
                    })
}

holder1.agent.events.on<ProofStateChangedEvent>(ProofEventTypes.ProofStateChanged, handler)

[oadamovskyi]

Yep, it works. Thanks