removed development folder
This commit is contained in:
@@ -1,7 +0,0 @@
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all: client server
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client:
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go build -o ekho client.go
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server:
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go build -o motd server.go
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@@ -1,321 +0,0 @@
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// =============================================================================
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// Auth: alex
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// File: client.go
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// Revn: 10-05-2023 2.0
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// Func: ask server for a message of the day quote
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//
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// TODO: document
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// expand on /ba/ failures
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// add more flags?
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// log errors in logfile
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// =============================================================================
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// CHANGE LOG
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// -----------------------------------------------------------------------------
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// 05-11-2022: init
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// 05-17-2022: changed an entry in the response table
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// 08-16-2023: copied from speak.go
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// gutted, rewrote
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// 09-12-2023: added size conversation
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// added -d, -l, and -dest flags
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// commented
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// 09-21-2023: began complete-ass overhaul of handle() system
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// wrote draft of draw()
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// 09-26-2023: made draw return size and reference globals
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// imported check() from soary
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// 09-29-2023: commented handle()
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//*10-02-2023: commented main(), and friends
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//*10-05-2023: /remove/ works
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// removed -d flag
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// commented
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//
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// =============================================================================
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package main
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import (
|
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"io" // io.EOF
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"flag" // BoolVar, StringVar, Parse
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"fmt" // Println
|
||||
"math/rand" // NewSource, New, Intn, *rand.Rand
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||||
"net" // ResolveTCPAddr, DialTCP, conn.Write,Read
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"os" // Exit
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||||
"strconv" // Atoi, Itoa
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"strings" // Split
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||||
"time" // Now, UnixNano
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)
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|
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// print errors if they occur, quit
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func check( err error ) {
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|
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var errep string // declare error report string
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switch err { // switch case over error input
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case nil: // if there was no error
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// then there was no error
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errep = "err is nil"
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case io.EOF: // if there was an End Of File error
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errep = "Error: " + err.Error() // document error
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conn.Close() // close connection
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default: // anything besides those are a big deal
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errep = "Fatal: " + err.Error()
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}
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|
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var critical bool // declare critical error flag
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||||
// must be neither nil nor EOF
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critical = err != nil && err != io.EOF
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if critical { // XXX critical print
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// TODO at some point, critical should be logging instead of
|
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// printing, only verbose should print
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fmt.Println( "check() -> ", errep )
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}
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if critical { // if there was a critical error
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os.Exit( 1 ) // cut and run
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}
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}
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// get user input
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func in( prompt string ) string {
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fmt.Print( prompt ) // print user prompt
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var input string // declare var to hold user input
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fmt.Scanln( &input ) // get user input
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// try to convert to an int, discard results
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_, err := strconv.Atoi( input )
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||||
// if there was an error, user didn't input an int
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||||
if err != nil {
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||||
// warn user against this
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fmt.Println( "Input must be a number" )
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input = in( prompt ) // try to get user input again
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// this, like handle() calling handle(), seems like a super
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// bad idea, stack-wise...
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}
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// once user has properly inputted a number, return string of num
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return input
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}
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||||
// seed and get a new rng
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func seed() *rand.Rand {
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// use current time to seed random number
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s := rand.NewSource( time.Now().UnixNano() )
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r := rand.New( s ) // create new random number from seed
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return r // return random number
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}
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// get a random number
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func draw() string {
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rn := seed() // get a random seed
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r := rn.Intn( qsize ) // get a random number using seed
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||||
// convert random number to ascii, because converting
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||||
// ints to bytes ( for networking ) and back is obnoxious
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rsz := strconv.Itoa( r )
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return rsz // return rand size
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}
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||||
|
||||
|
||||
// get server response and print
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func handle( conn net.Conn ) {
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|
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var buffer [512]byte // create buffer to hold response
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// read n bytes from server into buffer ( byte slice )
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n, err := conn.Read( buffer[:] )
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check( err ) // check for errors
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// split recv'd message over @, separate header from message
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msg := strings.Split( string( buffer[:n] ), "@" )
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var resp string // declare response variable
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switch msg[0] { // switch/case over the header
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// if message is...
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case "sa": // /sa/, size answer
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// convert back half to int, catch error
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size, nerr := strconv.Atoi( msg[1] )
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if nerr == nil { // if there was no error
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qsize = size // set size global to recv'd size
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} else {
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// if int conversion failed, just quit
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// TODO make more robust
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os.Exit( 1 )
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}
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req := draw() // draw a random number
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resp = "qr@" + req // create quote query with rng
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case "ba": // /ba/, bad answer
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// TODO create server-side, and handle client-side
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fmt.Println( "error in " + msg[1] + ": " + msg[2] )
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resp = "te@error" // set transaction end message
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case "qa": // /qa/, quote answer
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fmt.Println( msg[1] ) // whole-ass just print quote
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resp = "te@success" // set transaction end message
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case "la": // /la/, list answer
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// split recv'd message over newline to create quote list
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quotes := strings.Split( msg[1], "\n" )
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for p, v := range quotes { // iterate over quotes
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// print num of quote, followed by that quote
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fmt.Println( p + 1, "\t", v )
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}
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resp = "te@success" // set transaction end message
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case "aa": // /aa/, add answer
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// if server says add succeeded
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if msg[1] == "success" {
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fmt.Println( "Add successful" ) // print success
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resp = "te@success" // set transaction end message
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// if server says add failed
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} else if msg[1] == "error" {
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fmt.Println( "Add failed" ) // print fail
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resp = "te@error" // set transaction end message
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||||
// unknown status message
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||||
} else {
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// print unknown status
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fmt.Println( "Unknown status code: " + msg[1] )
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||||
// TODO should this be unknown instead of error?
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||||
resp = "te@error" // set transaction end message
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||||
}
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||||
case "r1": // /r1/, remove ( first transaction )
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||||
// the idea is that if the user doesn't specify which quote to
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||||
// remove, list all quotes and let the user choose the quote
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// to remove. There was probably a way to handle this a little
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// more simply, but this, I feel, has some nuance to it that I
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||||
// actually like
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// redo /la/, list all quotes
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// split recv'd message over newline to create quote list
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quotes := strings.Split( msg[1], "\n" )
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for p, v := range quotes { // iterate over quotes
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// print num of quote, followed by that quote
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fmt.Println( p + 1, "\t", v )
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}
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// ask user which quote to remove
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resp = "r2@" + in( "\n-> " )
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case "r2": // /r2/, remove ( second transaction )
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// if server says remove succeeded
|
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if msg[1] == "success" {
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fmt.Println( "Remove successful\n" ) // success
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// list all quotes to validate remove succeeded
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// TODO should /aa/ also make /lr/ before /te/?
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resp = "lr@dumvar" // set transaction end message
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// if server says remove failed
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} else if msg[1] == "error" {
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fmt.Println( "Remove failed" ) // print failure
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||||
resp = "te@error" // set transaction end message
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||||
// if unknown status message
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} else {
|
||||
// print unknown status
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fmt.Println( "Unknown error code: " + msg[1] )
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// TODO should this be unknown instead of error?
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resp = "te@error" // set transaction end message
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}
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||||
case "br": // /br/, bad request
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// client has asked for something nonsensical
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// TODO write out to file
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fmt.Println( "Client sent a bad request" )
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resp = "te@error" // set transaction end message
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default: // something undefined entirely
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// TODO write out to file
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//fmt.Println( "Message header not recognized" )
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//fmt.Println( msg )
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conn.Close() // TODO how important is this line
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return // dead return, essentially lets program quit
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||||
}
|
||||
|
||||
// send formulated response back to server
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||||
_, err = conn.Write( []byte( resp ) )
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||||
check( err ) // make sure write worked
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|
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handle( conn ) // call handle again
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}
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||||
|
||||
|
||||
// globals
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||||
var qsize int // keep track of num of quotes
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var conn net.Conn // keep track of connection
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||||
|
||||
|
||||
// global flag variables
|
||||
var add bool // add new quotes to quote file ( on server )
|
||||
var remove bool // remove quotes from quote file ( on server )
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||||
var list bool // request entire quote file from server
|
||||
var dest string // provide a new destination ip and port
|
||||
|
||||
|
||||
func main() {
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|
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// define flags
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flag.BoolVar( &add, "a", false, "add quote to list" )
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||||
flag.BoolVar( &remove, "r", false, "remove quote from list" )
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||||
flag.BoolVar( &list, "l", false, "print quote list" )
|
||||
flag.StringVar( &dest, "ip", ":1300", "ip:port of server" )
|
||||
flag.Parse() // process flags
|
||||
|
||||
service := dest // declare server ip:port
|
||||
|
||||
// create address object
|
||||
addr, err := net.ResolveTCPAddr( "tcp", service )
|
||||
check( err ) // check for errors
|
||||
|
||||
// make connection with object
|
||||
conn, err = net.DialTCP( "tcp", nil, addr )
|
||||
check( err ) // check for errors
|
||||
|
||||
// block for all flags
|
||||
var command string
|
||||
switch { // empty switch statement is basically an if
|
||||
case list: // if list flag is active
|
||||
command = "lr@dumvar" // list request
|
||||
// TODO come up with a useful argument, instead of dumvar
|
||||
case add: // if add flag is active
|
||||
// if arguments were specified
|
||||
if len( flag.Args() ) != 0 {
|
||||
command = "ar@" // preface command w/ add request
|
||||
// need to concat flag.args
|
||||
for _, v := range flag.Args() {
|
||||
// add the string and a space to command
|
||||
command = command + v + " "
|
||||
}
|
||||
// remove the trailing space
|
||||
command = command[:len( command ) - 1]
|
||||
} else { // if no arguments were specified
|
||||
// print that you need args and bail
|
||||
fmt.Println( "/a/ flag must be used with an arugment" )
|
||||
os.Exit( 1 )
|
||||
}
|
||||
case remove: // if remove flag is active
|
||||
// if arguments were specified
|
||||
if len( flag.Args() ) > 0 {
|
||||
// argument is supposed to the number of the quote to
|
||||
// be removed, get first arg
|
||||
// cast to int just to make sure it's a valid number
|
||||
// assuming the user knows what they're doing
|
||||
_, rerr := strconv.Atoi( flag.Args()[0] )
|
||||
// if there was an error, just pretend there's no args
|
||||
if rerr != nil {
|
||||
command = "r1@dumvar" // remove request 1
|
||||
// TODO come up w/ useful argument, replace dumvar
|
||||
} else {
|
||||
// if user knows the number, take care of it
|
||||
// arg[0] is a string, so concat is cool
|
||||
// jump right into remove request 2
|
||||
command = "r2@" + flag.Args()[0]
|
||||
}
|
||||
} else { // if no argument was specified for remove
|
||||
// jump right into remove request 1
|
||||
command = "r1@dumvar"
|
||||
}
|
||||
default: // if no flag was specified
|
||||
// begin transaction for quote request
|
||||
command = "sr@please" // size request
|
||||
}
|
||||
|
||||
// write command to server, beginning transaction
|
||||
_, err = conn.Write( []byte( command ) )
|
||||
check( err ) // make sure write worked
|
||||
|
||||
handle( conn ) // handle response
|
||||
// TODO stack trace when handle returns, should probably be
|
||||
// updated
|
||||
conn.Close() // close connection when finished
|
||||
|
||||
os.Exit( 0 ) // exit
|
||||
|
||||
}
|
||||
|
||||
Binary file not shown.
Binary file not shown.
Binary file not shown.
@@ -1,190 +0,0 @@
|
||||
// =============================================================================
|
||||
// Auth: alex
|
||||
// File: client.go
|
||||
// Revn: 05-19-2024 0.2
|
||||
// Func: ask server for a message of the day quote
|
||||
//
|
||||
// TODO: gut
|
||||
// write
|
||||
// =============================================================================
|
||||
// CHANGE LOG
|
||||
// -----------------------------------------------------------------------------
|
||||
// 05-18-2024: gutted
|
||||
// 05-19-2024: fixed
|
||||
// commented
|
||||
//
|
||||
// =============================================================================
|
||||
|
||||
package main
|
||||
|
||||
import (
|
||||
//"io" // io.EOF
|
||||
"flag" // BoolVar, StringVar, Parse
|
||||
"fmt" // Println
|
||||
"net" // ResolveTCPAddr, DialTCP, conn.Write,Read
|
||||
"os" // Exit
|
||||
//"strconv" // Atoi, Itoa
|
||||
//"strings" // Split
|
||||
)
|
||||
|
||||
|
||||
/*
|
||||
// print errors if they occur, quit
|
||||
func check( err error ) {
|
||||
|
||||
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
|
||||
}
|
||||
}
|
||||
|
||||
|
||||
// get server response and print
|
||||
func handle( conn net.Conn ) {
|
||||
|
||||
var buffer [tsize]byte // create buffer to hold response
|
||||
// read n bytes from server into buffer ( byte slice )
|
||||
n, err := conn.Read( buffer[:] )
|
||||
check( err ) // check for errors
|
||||
|
||||
// split recv'd message over @, separate header from message
|
||||
msg := strings.Split( string( buffer[:n] ), "@" )
|
||||
|
||||
var resp string // declare response variable
|
||||
switch msg[0] { // switch/case over the header
|
||||
case "la": // /la/, list answer
|
||||
if len( msg ) > 2 {
|
||||
resp = "lr@"
|
||||
|
||||
} else {
|
||||
// split recv'd message over newline to create quote list
|
||||
quotes := strings.Split( msg[1], "\n" )
|
||||
for p, v := range quotes { // iterate over quotes
|
||||
// print num of quote, followed by that quote
|
||||
fmt.Println( p + 1, "\t", v )
|
||||
}
|
||||
resp = "te@success"
|
||||
}
|
||||
default: // something undefined entirely
|
||||
// TODO write out to file
|
||||
//fmt.Println( "Message header not recognized" )
|
||||
//fmt.Println( msg )
|
||||
conn.Close() // TODO how important is this line
|
||||
return // dead return, essentially lets program quit
|
||||
}
|
||||
|
||||
// send formulated response back to server
|
||||
_, err = conn.Write( []byte( resp ) )
|
||||
check( err ) // make sure write worked
|
||||
|
||||
handle( conn ) // call handle again
|
||||
}
|
||||
*/
|
||||
|
||||
|
||||
// quick check for errors
|
||||
func check( err error ) {
|
||||
if err != nil { // err should be nil, !nil is bad
|
||||
// print error and ditch
|
||||
fmt.Println( "fatal::", err )
|
||||
os.Exit( 1 )
|
||||
}
|
||||
}
|
||||
|
||||
|
||||
// level 4 handle
|
||||
func handle( conn net.Conn ) {
|
||||
// create byte array of pre-ordained size
|
||||
buf := make( []byte, tsize )
|
||||
|
||||
// read from connection into byte array
|
||||
_, err := conn.Read( buf )
|
||||
check( err ) // routine check for errors
|
||||
|
||||
msg := string( buf ) // convert to string
|
||||
|
||||
/*
|
||||
// iterate over message string
|
||||
for p, c := range msg {
|
||||
// cast char ( rune ) to string and see if it's the end char
|
||||
if string( c ) == "|" {
|
||||
// if end char, print everything BUT char and exit
|
||||
fmt.Println( msg[:p] )
|
||||
return
|
||||
}
|
||||
}
|
||||
*/
|
||||
|
||||
// iterate over message string
|
||||
for _, c := range msg {
|
||||
// cast char ( rune ) to string and see if it's the end char
|
||||
if string( c ) == "X" {
|
||||
// if end char, print everything BUT char and exit
|
||||
fmt.Println( msg )
|
||||
return
|
||||
}
|
||||
}
|
||||
|
||||
fmt.Println( msg ) // if char is not found, print entire
|
||||
handle( conn ) // message and recursively call level4
|
||||
}
|
||||
|
||||
|
||||
|
||||
// globals
|
||||
var tsize int
|
||||
var dest string // provide a new destination ip and port
|
||||
|
||||
|
||||
func main() {
|
||||
|
||||
// define flags
|
||||
flag.IntVar( &tsize, "s", 10, "tx size" )
|
||||
flag.StringVar( &dest, "ip", ":1300", "ip:port of server" )
|
||||
flag.Parse() // process flags
|
||||
|
||||
service := dest // declare server ip:port
|
||||
|
||||
// create address object
|
||||
addr, err := net.ResolveTCPAddr( "tcp", service )
|
||||
check( err ) // check for errors
|
||||
|
||||
// make connection with object
|
||||
conn, err := net.DialTCP( "tcp", nil, addr )
|
||||
check( err ) // check for errors
|
||||
|
||||
//command := "lr@pls"
|
||||
|
||||
// write command to server, beginning transaction
|
||||
//_, err = conn.Write( []byte( command ) )
|
||||
//check( err ) // make sure write worked
|
||||
|
||||
handle( conn ) // handle response
|
||||
// TODO stack trace when handle returns, should probably be
|
||||
// updated
|
||||
conn.Close() // close connection when finished
|
||||
|
||||
os.Exit( 0 ) // exit
|
||||
|
||||
}
|
||||
|
||||
Binary file not shown.
@@ -1,268 +0,0 @@
|
||||
// =============================================================================
|
||||
// Auth: Alex Celani
|
||||
// File: test.go
|
||||
// Revn: 05-19-2024 0.4
|
||||
// Func: explore bounding on piecewise file transmission ( PWFT )
|
||||
//
|
||||
// TODO: implement
|
||||
// =============================================================================
|
||||
// CHANGE LOG
|
||||
// -----------------------------------------------------------------------------
|
||||
// 04-19-2024: bones
|
||||
// level 0 PWFT
|
||||
// level 1 PWFT
|
||||
// level 2 PWFT
|
||||
// 05-13-2024: comment level 1 and level 2 PWFT
|
||||
// level 3 PWFT
|
||||
// 05-18-2024: began level 4 changes
|
||||
// 05-19-2024: got level 4 working
|
||||
// commented
|
||||
// wrote level 5
|
||||
// commented
|
||||
// wrote level 6!
|
||||
// commented
|
||||
//
|
||||
// =============================================================================
|
||||
|
||||
package main
|
||||
|
||||
import (
|
||||
"flag"
|
||||
"fmt"
|
||||
"math/rand"
|
||||
"net" // ResovleTCPAddr, ListenTCP, listener.Accept
|
||||
// conn.Read,Write
|
||||
"os" // Exit
|
||||
"strconv"
|
||||
)
|
||||
|
||||
|
||||
/*
|
||||
func makedata() {
|
||||
for c := 0; c < dsize; c++ {
|
||||
datum[c] = rand.Intn( dsize )
|
||||
}
|
||||
}
|
||||
*/
|
||||
|
||||
// special make function for strings
|
||||
func makedatatx() {
|
||||
// classic iteration of length dsize, toss in same-sized array
|
||||
for c := 0; c < dsize; c++ {
|
||||
// toss in same size array
|
||||
// rand int picks letter, 0x61 -> lowercase ascii, cast byte
|
||||
datumtx[c] = byte( rand.Intn( 26 ) + 0x61 )
|
||||
}
|
||||
// cast to string and print ( as slice )
|
||||
fmt.Println( string( datumtx[:] ) )
|
||||
}
|
||||
|
||||
|
||||
// handle errors catastrophically
|
||||
func check( err error ) {
|
||||
if err != nil { // error is not nil on error
|
||||
// print error
|
||||
fmt.Println( "Fatal: ", err.Error() )
|
||||
os.Exit( 1 ) // bail
|
||||
}
|
||||
}
|
||||
|
||||
|
||||
// Levels of PWFT
|
||||
// 0. print everything indescriminately
|
||||
// 1. printing piecewise
|
||||
// 2. printing piecewise with header
|
||||
// 3. printing piecewise with variable size header
|
||||
// 4. file tx piecewise
|
||||
// 5. file tx piecewise with header
|
||||
// 6. file tx piecewise with variable header
|
||||
|
||||
|
||||
// level 0 PWFT
|
||||
func level0( data []int) {
|
||||
fmt.Println( data ) // level 0 sux
|
||||
}
|
||||
|
||||
|
||||
// level 1 PWFT
|
||||
func level1() {
|
||||
tsize := 5 // print 5 chars at a time
|
||||
txn := dsize / tsize // amount of prints needed
|
||||
for c := 0; c < txn; c++ { // iterate that amount of times
|
||||
// print ( using wrapper ) n-1 data points of size tsize
|
||||
level0( datum[c*tsize:(c+1)*tsize] )
|
||||
}
|
||||
level0( datum[txn*tsize:] ) // print nth data point
|
||||
}
|
||||
|
||||
|
||||
// level 2 PWFT
|
||||
func level2() {
|
||||
var bsize int = 10 // total transmission size
|
||||
var header string = "Lr@x@" // static header
|
||||
// calculate usable header size
|
||||
var tsize int = bsize - len( header )
|
||||
txn := dsize / tsize // amount of prints needed
|
||||
for c := 0; c < txn; c++ { // iterate that amount of times
|
||||
fmt.Print( header ) // print static header
|
||||
// exact same print statement from level 1
|
||||
level0( datum[c*tsize:(c+1)*tsize] )
|
||||
}
|
||||
fmt.Print( header ) // print nth static header
|
||||
level0( datum[txn*tsize:] ) // print nth data point again
|
||||
}
|
||||
|
||||
|
||||
// level 3 PWFT
|
||||
func level3() {
|
||||
var header string // declare header
|
||||
var bsize int = 10 // total transmission size
|
||||
var hhead, htail string = "Lr@", "@" // static pieces of header
|
||||
txn := 1 // init transmission number
|
||||
pos := 0 // init position tracker
|
||||
|
||||
for { // easier to do an infinite loop and break later
|
||||
// combine both static parts of the header with the tx number
|
||||
header = hhead + strconv.Itoa( txn ) + htail
|
||||
hlen := len( header ) // keep track of total header length
|
||||
fmt.Print( header ) // print header
|
||||
|
||||
// level0 print ( bsize - hlen ) units of data, starting at
|
||||
// the noted position
|
||||
level0( datum[ pos:(pos + bsize - hlen) ] )
|
||||
// update position as last position printed
|
||||
pos = pos + bsize - hlen
|
||||
txn++ // update transmission number
|
||||
|
||||
// check to see if *updated* position goes out of bounds
|
||||
if pos + bsize - hlen > dsize {
|
||||
break // break if'n
|
||||
}
|
||||
}
|
||||
// print nth header ( X denotes final transmission )
|
||||
fmt.Print( hhead + "X" + htail )
|
||||
level0( datum[pos:] ) // print from final position to end
|
||||
}
|
||||
|
||||
|
||||
// level 4 PWFT
|
||||
func level4( conn net.Conn ) {
|
||||
txn := dsize / tsize // amount of transmissions
|
||||
|
||||
// iterate for number of transmissions
|
||||
for c := 0; c < txn; c++ {
|
||||
// write that amount of times, very specific slice
|
||||
_, err := conn.Write( datumtx[c*tsize:(c+1)*tsize] )
|
||||
check( err ) // routine error check
|
||||
}
|
||||
|
||||
// write final of last chunk of data
|
||||
_, err := conn.Write( datumtx[txn * tsize:] )
|
||||
check( err ) // routine error check
|
||||
_, err = conn.Write( []byte( "|" ) ) // write end char
|
||||
check( err ) // routine error check
|
||||
}
|
||||
|
||||
|
||||
// level 5 PWFT
|
||||
func level5( conn net.Conn ) {
|
||||
header := "la@x@" // static header
|
||||
psize := tsize - len( header ) // calculate payload size
|
||||
|
||||
txn := dsize / psize // amount of transmissions
|
||||
|
||||
// iterate for number of transmissions
|
||||
for c := 0; c < txn; c++ {
|
||||
// concat header with payload, easier as string, cast to byte
|
||||
packet := header + string( datumtx[c*psize:(c+1)*psize] )
|
||||
// write that amount of times, very specific slice
|
||||
_, err := conn.Write( []byte( packet ) )
|
||||
check( err ) // routine error check
|
||||
}
|
||||
|
||||
// concat last payload
|
||||
packet := header + string( datumtx[txn*psize:] )
|
||||
// write final of last chunk of data
|
||||
_, err := conn.Write( []byte( packet ) )
|
||||
check( err ) // routine error check
|
||||
_, err = conn.Write( []byte( "|" ) ) // write end char
|
||||
check( err ) // routine error check
|
||||
}
|
||||
|
||||
|
||||
// level 6 PWFT
|
||||
func level6( conn net.Conn ) {
|
||||
var header string // declare header
|
||||
var hhead, htail string = "la@", "@" // static pieces of header
|
||||
txn := 1 // init transmission number
|
||||
pos := 0 // init position tracker
|
||||
|
||||
for { // easier to do an infinite loop and break later
|
||||
// combine both static parts of the header with the tx number
|
||||
header = hhead + strconv.Itoa( txn ) + htail
|
||||
hlen := len( header ) // keep track of total header length
|
||||
|
||||
// craft packet
|
||||
packet := header + string( datumtx[pos:( pos + tsize - hlen )] )
|
||||
|
||||
// cast packet to byte array and send
|
||||
_, err := conn.Write( []byte( packet ) )
|
||||
check( err ) // routine error check
|
||||
|
||||
// update position as last position printed
|
||||
pos = pos + tsize - hlen
|
||||
txn++ // update transmission number
|
||||
|
||||
// check to see if *updated* position goes out of bounds
|
||||
if pos + tsize - hlen > dsize {
|
||||
break // break if'n
|
||||
}
|
||||
}
|
||||
// print nth header ( X denotes final transmission )
|
||||
header = hhead + "X" + htail
|
||||
packet := header + string( datumtx[pos:] )
|
||||
// cast data to string, concat, cast to byte array, send
|
||||
_, err := conn.Write( []byte( packet ) )
|
||||
check( err ) // routine error check
|
||||
|
||||
}
|
||||
|
||||
|
||||
// size variables
|
||||
var dsize int = 104
|
||||
// data global
|
||||
var datum = make( []int, dsize )
|
||||
var datumtx = make( []byte, dsize )
|
||||
var tsize int
|
||||
|
||||
|
||||
func main() {
|
||||
|
||||
flag.IntVar( &tsize, "s", 10, "tx size" )
|
||||
flag.Parse()
|
||||
|
||||
makedatatx() // fill global with data
|
||||
|
||||
service := ":1300" // create service on ip and port
|
||||
|
||||
// resolve ip address and port
|
||||
addr, err := net.ResolveTCPAddr( "tcp", service )
|
||||
check( err ) // make sure ip resolves
|
||||
|
||||
// create listener object from ip:port
|
||||
listener, err := net.ListenTCP( "tcp", addr )
|
||||
|
||||
// print global data to show that PWFT works as intended
|
||||
//level0( datum )
|
||||
|
||||
//level3() // do the thing
|
||||
|
||||
for {
|
||||
// wait, create connection when found
|
||||
conn, err := listener.Accept()
|
||||
check( err ) // make sure connection works
|
||||
|
||||
go level6( conn ) // handle connection
|
||||
}
|
||||
}
|
||||
|
||||
@@ -1,281 +0,0 @@
|
||||
// =============================================================================
|
||||
// Auth: Alex Celani
|
||||
// File: server.go
|
||||
// Revn: 10-17-2023 3.0
|
||||
// Func: host connection, reply to speak.go
|
||||
//
|
||||
// TODO: add more /codes/ to handle
|
||||
// add flags?
|
||||
// write usage and errors to logfile
|
||||
// send logfile to client on request
|
||||
// =============================================================================
|
||||
// CHANGE LOG
|
||||
// -----------------------------------------------------------------------------
|
||||
// 05-13-2022: init
|
||||
// 08-29-2023: gutted and rewrote
|
||||
// commented
|
||||
// 09-12-2023: imported io/ioutil, strings, strconv
|
||||
// added size conversation
|
||||
// added file read function, fread()
|
||||
// commented
|
||||
// 09-21-2023: began rewrite of handle()
|
||||
// 09-26-2023: got /list/ command working
|
||||
// got /add/ command (mostly) working
|
||||
//*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?
|
||||
//*10-17-2023: fixed bug where quotes are read from and saved to two
|
||||
// different files
|
||||
// removed implicit newline at end of qfile to stop ghost
|
||||
// line bug in /la/
|
||||
// removed dead debug print in fread()
|
||||
//
|
||||
// =============================================================================
|
||||
|
||||
package main
|
||||
|
||||
import (
|
||||
"fmt" // Println
|
||||
"io" // io.EOF
|
||||
"io/ioutil" // ReadFile
|
||||
"net" // ResovleTCPAddr, ListenTCP, listener.Accept
|
||||
// conn.Read,Write
|
||||
"os" // Exit
|
||||
"strconv" // Itoa
|
||||
"strings" // Split
|
||||
)
|
||||
|
||||
|
||||
// handle errors catastrophically
|
||||
func check( err error ) {
|
||||
if err != nil { // error is not nil on error
|
||||
// print error
|
||||
fmt.Println( "Fatal: ", err.Error() )
|
||||
os.Exit( 1 ) // bail
|
||||
}
|
||||
}
|
||||
|
||||
|
||||
// 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
|
||||
qfile, err := ioutil.ReadFile( "list.q" )
|
||||
check( err ) // make sure read works
|
||||
// there is a trailing newline in the file, not removing it caused
|
||||
// bugs where a blank item was introduced into qlist and calling
|
||||
// /la/ would produce a blank line on the client side that didn't
|
||||
// really exist
|
||||
qfile = qfile[:len( qfile ) - 1]
|
||||
// cast bytes to string, split string over newline into array
|
||||
qlist = strings.Split( string( qfile ), "\n" )
|
||||
// deal with the trailing
|
||||
return string( qfile ) // return file as string
|
||||
}
|
||||
|
||||
|
||||
// write qfile back to file
|
||||
func writeFile( f string ) {
|
||||
// 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 ) // make sure writeback worked
|
||||
}
|
||||
|
||||
|
||||
// handle connections ( new and improved )
|
||||
func handle( conn net.Conn ) {
|
||||
|
||||
// create buffer to hold read message
|
||||
var buffer [256]byte
|
||||
// read n bytes from client
|
||||
n, err := conn.Read( buffer[:] )
|
||||
checkN( err, conn ) // make sure read worked
|
||||
|
||||
// cast message to string, take first n bytes, split over @
|
||||
command := strings.Split( string( buffer[:n] ), "@" )
|
||||
|
||||
// declare response string
|
||||
var resp string
|
||||
switch command[0] { // switch/case over opcode
|
||||
case "sr": // /sr/, size request
|
||||
// get length of list, convert to string
|
||||
// XXX probably no reason to have this declaration scheme
|
||||
var num string = strconv.Itoa( len( qlist ) )
|
||||
// concat and send
|
||||
resp = "sa@" + num // size answer
|
||||
case "qr": // /qr/, quote request
|
||||
// convert message argument to string to make sure it's a
|
||||
// valid number
|
||||
num, nerr := strconv.Atoi( command[1] )
|
||||
// nerr will not be nil if comm[1] is not a number
|
||||
if nerr != nil {
|
||||
// formulate an error message
|
||||
// TODO flesh this out more
|
||||
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 ):
|
||||
// bad answer in quote request
|
||||
resp = "ba@qr@>"
|
||||
// why bad? num is >
|
||||
case num < 0:
|
||||
// bad answer in quote request
|
||||
resp = "ba@qr@-"
|
||||
// why bad? num is -
|
||||
default:
|
||||
// good num, get quote, send off
|
||||
resp = "qa@" + qlist[num] // quote answer
|
||||
}
|
||||
}
|
||||
case "lr": // /lr/, list request
|
||||
// just concat entire list to send
|
||||
//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 + "\n" + command[1]
|
||||
writeFile( qfile )
|
||||
resp = "aa@success" // add answer
|
||||
// TODO write to file
|
||||
case "r1": // /r1/, remove request 1
|
||||
// same as list, just send whole file
|
||||
resp = "r1@" + qfile // remove request 1
|
||||
case "r2": // /r2/, remove request 2
|
||||
// convert message argument to string to make sure it's a
|
||||
// valid number
|
||||
num, nerr := strconv.Atoi( command[1] )
|
||||
// nerr will not be nil if comm[1] is not a number
|
||||
if nerr != nil {
|
||||
// formulate an error message
|
||||
// TODO flesh this out more
|
||||
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@>"
|
||||
// why bad? num is >
|
||||
case num < 0:
|
||||
// bad answer in quote request
|
||||
resp = "ba@r2@-"
|
||||
// why bad? num is -
|
||||
// if num is not OUT OF RANGE, must be in range
|
||||
default:
|
||||
// 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]
|
||||
// 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"
|
||||
}
|
||||
// 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 ) // write back to file
|
||||
// let client know remove was successful
|
||||
resp = "r2@success"
|
||||
}
|
||||
}
|
||||
case "te": // /te/, transaction end
|
||||
// TODO should I be sending something?
|
||||
// TODO is it better to close now or outside of handle()
|
||||
conn.Close() // close connection and leave
|
||||
return // return from handle(), finish connection
|
||||
default: // opcode not recognized
|
||||
// TODO there should be more being down, here, right?
|
||||
return // return from handle(), finish connection
|
||||
}
|
||||
|
||||
// write response to client
|
||||
_, err = conn.Write( []byte( resp ) )
|
||||
checkN( err, conn ) // make sure write worked
|
||||
|
||||
handle( conn ) // call handle() again to get response from client
|
||||
|
||||
}
|
||||
|
||||
|
||||
// globals
|
||||
var qlist []string // list of quotes
|
||||
var qfile string // file object
|
||||
|
||||
|
||||
// main, create port and wait for connection
|
||||
func main() {
|
||||
|
||||
qfile = fread() // read quote file, init ( global ) list of quotes
|
||||
|
||||
service := ":1300" // create service on ip and port
|
||||
|
||||
// resolve ip address and port
|
||||
addr, err := net.ResolveTCPAddr( "tcp", service )
|
||||
check( err ) // make sure ip resolves
|
||||
|
||||
// create listener object from ip:port
|
||||
listener, err := net.ListenTCP( "tcp", addr )
|
||||
|
||||
for {
|
||||
// wait, create connection when found
|
||||
conn, err := listener.Accept()
|
||||
check( err ) // make sure connection works
|
||||
|
||||
go handle( conn ) // handle connection
|
||||
}
|
||||
|
||||
os.Exit( 0 ) // exeunt
|
||||
|
||||
}
|
||||
|
||||
Reference in New Issue
Block a user