StoreBackEnd/pkg/protocol/rules/readers/SendFileRule.go

package readers

import (
	"StoreBackEnd/pkg/protocol"
	"StoreBackEnd/pkg/protocol/repository"
	"StoreBackEnd/pkg/protocol/rules/writers"
	"StoreBackEnd/pkg/utils"
	"bufio"
	"strconv"
)

// SendFileRulePrefix Rule command prefix
const SendFileRulePrefix = "ffe_sendfile"

// SendFileRule Storage structure for the SendFileRule
type SendFileRule struct {
	// cmd Rule name
	cmd string
	// matcher Allow to make a regex match
	matcher *protocol.RegexMatcher
	// protocolRepo Instance de ProtocolRepository
	protocolRepo *repository.ProtocolRepository
}

// CreateSendFileRule Creating an instance of SendFileRule
func CreateSendFileRule(pattern string, protocolRepo *repository.ProtocolRepository) protocol.IProtocolReader {
	return &SendFileRule{
		cmd:          SendFileRulePrefix,
		matcher:      protocol.CreateRegexMatcher(pattern),
		protocolRepo: protocolRepo,
	}
}

// GetCmd retrieve the command name.
func (rule SendFileRule) GetCmd() string {
	return rule.cmd
}

// Execute the Rule with a string command.
func (rule SendFileRule) Execute(data string) (*protocol.ProtocolWriterResult, func(reader *bufio.Reader) *protocol.ProtocolWriterResult) {
	println(0)
	if rule.Match(data) { // TODO : cloture this command.
		println("OK")
		values := rule.matcher.Parse(data)

		// Values
		fileName := values[1]
		fileSize, _ := strconv.Atoi(values[2])
		// fileContentHash := values[3]
		println(1)
		// function callback
		callback := rule.onRead(fileName, fileSize)
		println(2)
		return rule.protocolRepo.ExecuteWriter(writers.SendOkRulePrefix), callback
	} else {
		return rule.protocolRepo.ExecuteWriter(writers.SendErrorRulePrefix), nil
	}
}

func (rule SendFileRule) onRead(fileName string, fileSize int) func(reader *bufio.Reader) *protocol.ProtocolWriterResult {

	return func(reader *bufio.Reader) *protocol.ProtocolWriterResult {
		hasReceive := utils.ReceiveFile(fileName, fileSize, reader)
		println(3)
		if !hasReceive {
			return rule.protocolRepo.ExecuteWriter(writers.SendErrorRulePrefix)
		} else {
			return rule.protocolRepo.ExecuteWriter(writers.SendOkRulePrefix)
		}
	}
}

// Match make a match with the current Rule and check if it matches.
func (rule SendFileRule) Match(data string) bool {
	return rule.matcher.Match(data)
}