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fixed bugs with /list/, /add/, got /remove/ working

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This commit is contained in:
Alex
2023-10-05 23:29:38 -04:00
parent c081eddc62
commit 834321cc8d
2 changed files with 113 additions and 66 deletions
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server.go
+76 -37
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@@ -1,13 +1,13 @@
// =============================================================================
// Auth: Alex Celani
// File: server.go
// Revn: 10-02-2023 1.0
// Revn: 10-05-2023 2.0
// Func: host connection, reply to speak.go
//
// TODO: fix remove
// write back to file, re-read file
// add more /codes/ to handle
// TODO: add more /codes/ to handle
// add flags
// write usage and errors to logfile
// send logfile to client on request
// =============================================================================
// CHANGE LOG
// -----------------------------------------------------------------------------
@@ -24,12 +24,20 @@
//*10-02-2023: commented handle()
// added checks to /qr/ and /r2/ to make sure recv'd
// length is valid
// wrote writeFile()
//*10-05-2023: commented
// imported check() to ignore EOF
// fixed bug in /r2/ where removing quote at final
// position would break
// removed deadcode from /r2/, unused "quit" bool?
//
// =============================================================================
package main
import (
"fmt" // Println
"io" // io.EOF
"io/ioutil" // ReadFile
"net" // ResovleTCPAddr, ListenTCP, listener.Accept
// conn.Read,Write
@@ -49,6 +57,37 @@ func check( err error ) {
}
// FIXME clean this two check() shit up
// print errors if they occur, quit
func checkN( err error, conn net.Conn ) {
var errep string // declare error report string
switch err { // switch case over error input
case nil: // if there was no error
// then there was no error
errep = "err is nil"
case io.EOF: // if there was an End Of File error
errep = "Error: " + err.Error() // document error
conn.Close() // close connection
default: // anything besides those are a big deal
errep = "Fatal: " + err.Error()
}
var critical bool // declare critical error flag
// must be neither nil nor EOF
critical = err != nil && err != io.EOF
if critical { // XXX critical print
// TODO at some point, critical should be logging instead of
// printing, only verbose should print
fmt.Println( "check() -> ", errep )
}
if critical { // if there was a critical error
os.Exit( 1 ) // cut and run
}
}
// read file and create quote list
func fread() string {
// open file "quotes", read entire file as bytes into qfile
@@ -69,10 +108,12 @@ func fread() string {
// write qfile back to file
func writeFile( f string ) {
file, err := os.Create( "quotes" )
check( err )
// open file list.q as variable file
file, err := os.Create( "list.q" )
check( err ) // make sure open worked
// write input string ( quote file ) back to file
_, err = file.WriteString( f )
check( err )
check( err ) // make sure writeback worked
}
@@ -83,7 +124,7 @@ func handle( conn net.Conn ) {
var buffer [256]byte
// read n bytes from client
n, err := conn.Read( buffer[:] )
check( err ) // make sure read worked
checkN( err, conn ) // make sure read worked
// cast message to string, take first n bytes, split over @
command := strings.Split( string( buffer[:n] ), "@" )
@@ -105,7 +146,7 @@ func handle( conn net.Conn ) {
if nerr != nil {
// formulate an error message
// TODO flesh this out more
resp = "ba@Number not understood" // bad answer
resp = "ba@qr@!" // bad answer
} else { // comm[1] was a number, but...
switch { // how do we know it's a valid number
case num > len( qlist ):
@@ -114,7 +155,7 @@ func handle( conn net.Conn ) {
// why bad? num is >
case num < 0:
// bad answer in quote request
resp = "bad@qr@-"
resp = "ba@qr@-"
// why bad? num is -
default:
// good num, get quote, send off
@@ -123,13 +164,14 @@ func handle( conn net.Conn ) {
}
case "lr": // /lr/, list request
// just concat entire list to send
resp = "la@" + qfile[:len( qfile ) - 1] // list answer
//resp = "la@" + qfile[:len( qfile ) - 1] // list answer
resp = "la@" + qfile // list answer
// TODO what happens if this is longer than 256 char?
case "ar": // /ar/, add request
// append new quote to list
qlist = append( qlist, command[1] )
// also append new quote to file variable
qfile = qfile + command[1] + "\n"
qfile = qfile + "\n" + command[1]
writeFile( qfile )
resp = "aa@success" // add answer
// TODO write to file
@@ -144,9 +186,11 @@ func handle( conn net.Conn ) {
if nerr != nil {
// formulate an error message
// TODO flesh this out more
resp = "ba@Number not understood" // bad answer
resp = "ba@r2@!" // bad answer
} else { // comm[1] was a number, but...
num = num - 1
switch { // how do we know it's a valid number
// valid numbers are from 0 - len-1
case num > len( qlist ):
// bad answer in quote request
resp = "ba@r2@>"
@@ -155,36 +199,32 @@ func handle( conn net.Conn ) {
// bad answer in quote request
resp = "ba@r2@-"
// why bad? num is -
// if num is not OUT OF RANGE, must be in range
default:
qlist[num + 1] = qlist[len( qlist ) - 1]
// replace the quote at that position with
// final quote
qlist[num] = qlist[len( qlist ) - 1]
// remove second copy of quote
qlist = qlist[:len( qlist ) - 1]
var f string = ""
// O(1) remove from list at any position
// must entirely recreate quote string
var f string = "" // init empty string
// iterate over list, disregard index
for _, v := range qlist {
// add next quote to file and separate
// quotes with newline
f = f + v + "\n"
}
f = f[:len( f ) - 1]
// remove trailing newline, to prevent ghost
f = f[:len( f ) - 1] // quote in lr
// reassign global string variable to
// recreated quote string
qfile = f
writeFile( qfile )
resp = "r2@" + qfile
writeFile( qfile ) // write back to file
// let client know remove was successful
resp = "r2@success"
}
}
/*
resp = "r2@" // remove request 2
//
index, nerr := strconv.Atoi( command[1] )
if nerr == nil {
if index < len( qlist ) {
qlist[index] = qlist[len( qlist ) - 1]
qlist = qlist[:len( qlist ) - 1]
//writeFile() //TODO
resp = resp + "success"
} else {
resp = resp + "error"
}
} else {
resp = resp + "error"
}
*/
case "te": // /te/, transaction end
// TODO should I be sending something?
// TODO is it better to close now or outside of handle()
@@ -197,7 +237,7 @@ func handle( conn net.Conn ) {
// write response to client
_, err = conn.Write( []byte( resp ) )
check( err ) // make sure write worked
checkN( err, conn ) // make sure write worked
handle( conn ) // call handle() again to get response from client
@@ -207,7 +247,6 @@ func handle( conn net.Conn ) {
// globals
var qlist []string // list of quotes
var qfile string // file object
var quit bool
// main, create port and wait for connection