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const {getLogger} = require('./logger')
const {ResponseMessage, Connection} = require('./server')
class RequestHandler {
constructor() {
/**
* @type {Map<string, Function>}
*/
this.handlers = new Map()
/**
* @type {Logger}
*/
this.logger = getLogger('RequestHandler')
}
/**
* @param {string} requestType
* @param {Function} handler
*/
set(requestType, handler) {
if (this.handlers.has(requestType))
throw new Error(`handler for '${requestType}' has already been set`)
this.handlers.set(requestType, handler)
}
/**
* @param {RequestMessage} message
* @param {Connection} connection
*/
process(message, connection) {
this.logger.info('process:', message)
if (this.handlers.has(message.requestType)) {
const f = this.handlers.get(message.requestType)
const result = f(message.requestData || {}, connection)
if (result instanceof Promise) {
result.then(data => {
connection.send(
new ResponseMessage(message.requestNo)
.setData(data)
)
}).catch(error => {
connection.send(
new ResponseMessage(message.requestNo)
.setError(error?.message)
)
})
}
} else {
connection.send(
new ResponseMessage(message.requestNo)
.setError(`unknown request type: '${message.requestType}'`)
)
}
}
}
module.exports = {
RequestHandler
}
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