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myRpcClient.go
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myRpcClient.go
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package main
import (
"ethos/altEthos"
"ethos/syscall"
"ethos/kernelTypes"
"ethos/defined"
"log"
"strings"
)
var userName string
var currentTransactionID int64
func init() {
SetupMyRpcTransactionStartIReply(transactionStartIReply)
SetupMyRpcTransactionEndIReply(transactionEndIReply)
SetupMyRpcReadIReply(readIReply)
SetupMyRpcWriteIReply(writeIReply)
SetupMyRpcAbortIReply(abortIReply)
}
func transactionStartIReply(transactionID int64, status string) (MyRpcProcedure) {
//currentTransactionID = transactionID
if (status == "1") {
currentTransactionID = transactionID
printToScreen("Started a new transaction\n")
}
return nil
}
func transactionEndIReply(status string) (MyRpcProcedure) {
if (status != "-1") {
currentTransactionID = -1
}
if(status == "2"){
printToScreen("Nothing to commit for the current transaction\n")
}
if(status == "3"){
printToScreen("Committed all changes to the database\n")
}
return nil
}
func readIReply(value string, status string) (MyRpcProcedure) {
if (status == "1") {
printToScreen("Value: ")
printToScreen(kernelTypes.String(value))
printToScreen("\n")
}
return nil
}
func writeIReply(status string) (MyRpcProcedure) {
if (status == "1") {
printToScreen("Updated the value\n")
}
return nil
}
func abortIReply(status string) (MyRpcProcedure) {
if (status == "1") {
currentTransactionID = -1
printToScreen("Aborted the transaction\n")
}
return nil
}
func sendCall(call defined.Rpc){
fd, status := altEthos.IpcRepeat("myRpc", "", nil)
if status != syscall.StatusOk {
log.Printf("Ipc failed: %v\n", status)
altEthos.Exit(status)
}
status = altEthos.ClientCall(fd, call)
if status != syscall.StatusOk {
log.Printf("clientCall failed: %v\n", status)
altEthos.Exit(status)
}
}
func startTransaction() {
call := MyRpcTransactionStartI{}
sendCall(&call)
}
func endTransaction() {
if(currentTransactionID == -1) {
printToScreen("Please start a transaction before any queries\n")
return
}
call := MyRpcTransactionEndI{currentTransactionID}
sendCall(&call)
}
func readDatabase() {
if(currentTransactionID == -1) {
printToScreen("Please start a transaction before any queries\n")
return
}
printToScreen("Enter variable Name: ")
var variableName kernelTypes.String
status := altEthos.ReadStream(syscall.Stdin, &variableName)
if status != syscall.StatusOk {
log.Printf("Error while reading syscall.Stdin: %v", status)
}
call := MyRpcReadI{currentTransactionID, string(strings.TrimRight(string(variableName), "\n"))}
sendCall(&call)
}
func writeDatabase() {
if(currentTransactionID == -1) {
printToScreen("Please start a transaction before any queries\n")
return
}
printToScreen("Enter variable Name: ")
var variableName kernelTypes.String
status := altEthos.ReadStream(syscall.Stdin, &variableName)
if status != syscall.StatusOk {
log.Printf("Error while reading syscall.Stdin: %v", status)
}
printToScreen("Enter variable value: ")
var variableValue kernelTypes.String
status = altEthos.ReadStream(syscall.Stdin, &variableValue)
if status != syscall.StatusOk {
log.Printf("Error while reading syscall.Stdin: %v", status)
}
call := MyRpcWriteI{currentTransactionID, string(strings.TrimRight(string(variableName), "\n")), string(strings.TrimRight(string(variableValue), "\n"))}
sendCall(&call)
}
func abortTransaction() {
if(currentTransactionID == -1) {
printToScreen("Please start a transaction before any queries\n")
return
}
call := MyRpcAbortI{currentTransactionID}
sendCall(&call)
}
func printToScreen(prompt kernelTypes.String) {
statusW := altEthos.WriteStream(syscall.Stdout, &prompt)
if statusW != syscall.StatusOk {
log.Printf("Error writing to syscall.Stdout: %v", statusW)
}
}
func printCommands(){
printToScreen("\n\nCommands\n")
printToScreen("---------------------\n")
printToScreen("-start : Start a transaction\n")
printToScreen("-end : End a transaction\n")
printToScreen("-read : Read a varible from the database\n")
printToScreen("-write : Write to a variable in the database\n")
printToScreen("-abort : Abort a transaction\n")
printToScreen("---------------------\n\n")
}
func userInputHandler(userInput string) {
if (userInput == "\n"){
printCommands()
} else if (userInput == "??\n") {
printCommands()
} else if (userInput == "-start\n"){
startTransaction()
} else if (userInput == "-end\n") {
endTransaction()
} else if (userInput == "-read\n") {
readDatabase()
} else if (userInput == "-write\n") {
writeDatabase()
} else if (userInput == "-abort\n") {
abortTransaction()
} else {
printCommands()
}
}
func getInput(){
for {
printToScreen("Enter Input (?? for commands) : ")
var userInput kernelTypes.String
status := altEthos.ReadStream(syscall.Stdin, &userInput)
if status != syscall.StatusOk {
log.Printf("Error while reading syscall.Stdin: %v", status)
}
userInputHandler(string(userInput));
}
}
func main () {
altEthos.LogToDirectory("test/myRpcClient")
log.Printf("Database Service: before call\n")
userName = altEthos.GetUser()
getInput()
log.Printf("Database Service: done\n")
}