func channelRead()

in NIOSMTP/NIOSMTP/SMTPResponseDecoder.swift [54:76]

• 20 lines of code
• 4 McCabe index (conditional complexity)

    func channelRead(context: ChannelHandlerContext, data: NIOAny) {
        var response = self.unwrapInboundIn(data)
        
        if let firstFourBytes = response.readString(length: 4), let code = Int(firstFourBytes.dropLast()) {
            let remainder = response.readString(length: response.readableBytes) ?? ""
            
            let firstCharacter = firstFourBytes.first!
            let fourthCharacter = firstFourBytes.last!
            
            switch (firstCharacter, fourthCharacter) {
            case ("2", " "),
                 ("3", " "):
                let parsedMessage = SMTPResponse.ok(code, remainder)
                context.fireChannelRead(self.wrapInboundOut(parsedMessage))
            case (_, "-"):
                () // intermediate message, ignore
            default:
                context.fireChannelRead(self.wrapInboundOut(.error(firstFourBytes+remainder)))
            }
        } else {
            context.fireErrorCaught(SMTPResponseDecoderError.malformedMessage)
        }
    }