Middleware service for handling emitted events on chronobank platform
This module is a part of middleware services. You can install it in 2 ways:
- through core middleware installer middleware installer
- by hands: just clone the repo, do 'npm install', set your .env - and you are ready to go
This module is used for processing events, emitted on chronobank smart contracts.
This how does it work:
- this module register multiAddress (from which events are emitted on chonobank smart contracts) in database in EthAccounts collection
- blockprocessor filter transactions by tx.to, tx.from and addresses in logs.
- chronoSc processor catch a new tx through rabbitmq, and parse it
- if he find smth inside logs, then chronoSc decode its definition and send the notification via rmq. For instance, we have an event called 'Tranfer'. When a new event is emitted, chronoSc processor catch it, parse and send notification via rabbitmq, with the routing key, named as event, but with lowercase - in our case 'transfer', and message, which contains the raw event's arguments (payload field), passed to event and event's name.
{
name: 'Transfer',
payload: {
from: '0x7cfbe900247e5191d42416e348e912a988833ebf',
to: '0xc69c2c879b39dfc53ca753491e2863264a0966b6',
value: 10000000
}
}
To apply your configuration, create a .env file in root folder of repo (in case it's not present already). Below is the expamle configuration:
MONGO_ACCOUNTS_URI=mongodb://localhost:27017/data
MONGO_ACCOUNTS_COLLECTION_PREFIX=eth
RABBIT_URI=amqp://localhost:5672
RABBIT_SERVICE_NAME=app_eth
SMART_CONTRACTS_NETWORK_ID=86
SMART_CONTRACTS_PATH=/user/app/node_modules/chronobank-smart-contracts/build/contracts
SMART_CONTRACTS_EVENT_CONTRACT=MultiEventsHistory
The options are presented below:
| name | description |
|---|---|
| MONGO_URI | the URI string for mongo connection |
| MONGO_COLLECTION_PREFIX | the default prefix for all mongo collections. The default value is 'eth' |
| MONGO_ACCOUNTS_URI | the URI string for mongo connection, which holds users accounts (if not specified, then default MONGO_URI connection will be used) |
| MONGO_ACCOUNTS_COLLECTION_PREFIX | the collection prefix for accounts collection in mongo (If not specified, then the default MONGO_COLLECTION_PREFIX will be used) |
| RABBIT_URI | rabbitmq URI connection string |
| RABBIT_SERVICE_NAME | namespace for all rabbitmq queues, like 'app_eth_transaction' |
| SMART_CONTRACTS_PATH | the path to built smart contracts (optional) |
| SMART_CONTRACTS_EVENT_CONTRACT | the smart contract, from which address events are emitted |
| SMART_CONTRACTS_NETWORK_ID | the network id (1-mainnet, 4-rinkeby and so on) |
| LOG_LEVEL | the logging level. Can be 'error' (which prints only errors) or 'info' (prints errors + info logs). Default is 'info' level |
| SYSTEM_RABBIT_URI | rabbitmq URI connection string for infrastructure |
| SYSTEM_RABBIT_SERVICE_NAME | rabbitmq service name for infrastructure |
| SYSTEM_RABBIT_EXCHANGE | rabbitmq exchange name for infrastructure |
| CHECK_SYSTEM | check infrastructure or not (default = true) |
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