bowd / celo-onboarding Goto Github PK

This might serve as a base for the development of the onboarding service but at the moment it's just a prototype showing how NestJS can be leveraged in order to structure an application close to our needs.

A Nest monorepo project combines several independent applications and libraries which are used by these applications. These applications can be either full-blown HTTP servers or microservices where Nest provides us with efficient and configurable transport mechanism. In our case we have:

• apps/onboarding - the Onboarding Service
• apps/relayer - the Relayer Service which is a TCP microservice
• libs/blockchain - dummy lib that could expose a Service which wraps ContractKit and is used by both applications

In order to play around with load-balancing the relayers I've also included a toy haproxy config and a docker-compose that spins up a network which looks like:

                                        *-------------------*
                                   o----| Relayer 1: 0xaaaa |
*-------------*      *---------*   |    *-------------------*   
| Onboarding  |------| HAProxy |---o
|  Service    |      *---------*   |    *-------------------*
*-------------*                    o----| Relayer 2: 0xbbbb |
                                        *-------------------*

To test it out run:

$ docker-compose -f docker-compose.proxy.yml up

This should build everything and spin up the network. It might take 1-2 seconds for HAProxy to pick up the relayers once they're online. You should see this:

relayer_proxy_1  | [WARNING] 245/063307 (6) : Server relayer_pool/relayer2 is UP, reason: Layer4 check passed, check duration: 0ms. 1 active and 0 backup servers online. 0 sessions requeued, 0 total in queue.
relayer_proxy_1  | [WARNING] 245/063307 (6) : Server relayer_pool/relayer1 is UP, reason: Layer4 check passed, check duration: 0ms. 2 active and 0 backup servers online. 0 sessions requeued, 0 total in queue.

After that navigate to localhost:3000/distributedBlindedPepper and you should see the payload composed in apps/relayer/src/relayer.service.ts and we can see how relayers are rotated.