oracle/ekho
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

added piecewise file transmission to /list/

Browse Source
This commit is contained in:
jontino tinerino
2024-06-14 17:57:32 -04:00
parent c3b513949c
commit a50d92c3a3
2 changed files with 119 additions and 24 deletions
Download Patch File Download Diff File Expand all files Collapse all files
client.go
+61 -12
View File
@@ -1,10 +1,10 @@
// =============================================================================
// Auth: alex
// File: client.go
// Revn: 10-05-2023 2.0
// Revn: 06-14-2024 3.0
// Func: ask server for a message of the day quote
//
// TODO: document
// TODO: remove ioutil import
// expand on /ba/ failures
// add more flags?
// log errors in logfile
@@ -27,6 +27,12 @@
//*10-05-2023: /remove/ works
// removed -d flag
// commented
// 06-12-2024: began added PWFT to /la/
// 06-13-2024: finished adding PWFT to /la/
// commented PWFT stuff
// STARTED BYTE-BASED PWFT REWRITE
//*06-14-2024: finished byte-based PWFT rewrite
// commented
//
// =============================================================================
@@ -34,11 +40,12 @@ package main
import (
"io" // io.EOF
"io/ioutil" // ReadFile
"flag" // BoolVar, StringVar, Parse
"fmt" // Println
"math/rand" // NewSource, New, Intn, *rand.Rand
"net" // ResolveTCPAddr, DialTCP, conn.Write,Read
"os" // Exit
"os" // Exit, Create
"strconv" // Atoi, Itoa
"strings" // Split
"time" // Now, UnixNano
@@ -118,7 +125,10 @@ func draw() string {
// get server response and print
func handle( conn net.Conn ) {
var buffer [512]byte // create buffer to hold response
// create buffer to hold response
buffer := make( []byte, tsize )
//var buffer [32]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
@@ -149,13 +159,51 @@ func handle( conn net.Conn ) {
fmt.Println( msg[1] ) // whole-ass just print quote
resp = "te@success" // set transaction end message
case "la": // /la/, list answer
// 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 )
if len( msg ) > 2 { // multistage send condition
if msg[1] == "X" { // final message
// TODO update
// read entire temp storage file as byte array
tfile, err := ioutil.ReadFile( "temp.q" )
check( err ) // check read for errors
// cast file to string, concat with recv'd string
tstr := string( tfile ) + msg[2]
// split concat over newlines, separating quotes
tlist := strings.Split( tstr, "\n" )
// iterate over array, printing each quote
for p, v := range tlist {
fmt.Println( p + 1, "\t", v )
}
// delete temp storage file
err = os.Remove( "temp.q" )
check( err ) // check rm for errors
resp = "te@X" // successful response message
} else { // first or intermediate message
// open temp quote storage file, creating if
// necessary, with write-only permissions, in
// append mode, wr u perm, r g/w perm
f, err := os.OpenFile( "temp.q", os.O_WRONLY | os.O_APPEND | os.O_CREATE, 0644 )
check( err ) // check file open for errors
// write received message to file, keeping track
// of bytes written
n, err = f.WriteString( msg[2] )
check( err ) // check file write for errors
// cast bytes already written field to int
b, err := strconv.Atoi( msg[1] )
check( err ) // check cast for errors
// add bytes just written to bytes already
// written, cast back to string, and append to
// response variable
resp = "lr@" + strconv.Itoa( b + n )
}
} else {
// split recv'd message over \n, 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" // set transaction end message
}
resp = "te@success" // set transaction end message
case "aa": // /aa/, add answer
// if server says add succeeded
if msg[1] == "success" {
@@ -236,7 +284,7 @@ var add bool // add new quotes to quote file ( on server )
var remove bool // remove quotes from quote file ( on server )
var list bool // request entire quote file from server
var dest string // provide a new destination ip and port
var tsize int // size of transmission buffer
func main() {
@@ -245,6 +293,7 @@ func main() {
flag.BoolVar( &remove, "r", false, "remove quote from list" )
flag.BoolVar( &list, "l", false, "print quote list" )
flag.StringVar( &dest, "ip", ":1300", "ip:port of server" )
flag.IntVar( &tsize, "s", 256, "transmission size ( bytes )" )
flag.Parse() // process flags
service := dest // declare server ip:port
@@ -261,7 +310,7 @@ func main() {
var command string
switch { // empty switch statement is basically an if
case list: // if list flag is active
command = "lr@dumvar" // list request
command = "lr@init" // list request
// TODO come up with a useful argument, instead of dumvar
case add: // if add flag is active
// if arguments were specified
server.go
+58 -12
View File
@@ -1,11 +1,13 @@
// =============================================================================
// Auth: Alex Celani
// Auth: alex
// File: server.go
// Revn: 10-17-2023 3.0
// Func: host connection, reply to speak.go
// Revn: 06-14-2024 4.0
// Func: host MOTD connection
//
// TODO: add more /codes/ to handle
// add flags?
// TODO: catch keyboard int. signal
// remove ioutil import
// add more /codes/ to handle
// add flags, like specify port
// write usage and errors to logfile
// send logfile to client on request
// =============================================================================
@@ -35,12 +37,19 @@
// removed implicit newline at end of qfile to stop ghost
// line bug in /la/
// removed dead debug print in fread()
// 05-26-2024: began writing PWFT update
// added flag to specify transmission buffer size
// 06-12-2024: "successfully" wrote PWFT
// 06-13-2024: removed debug print statements
// commented
//*06-14-2024: byte count-based PWFT rewrite
//
// =============================================================================
package main
import (
"flag" // IntVar, Parse
"fmt" // Println
"io" // io.EOF
"io/ioutil" // ReadFile
@@ -102,7 +111,7 @@ func fread() string {
// 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]
//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
@@ -125,7 +134,8 @@ func writeFile( f string ) {
func handle( conn net.Conn ) {
// create buffer to hold read message
var buffer [256]byte
buffer := make( []byte, tsize )
//var buffer [256]byte
// read n bytes from client
n, err := conn.Read( buffer[:] )
checkN( err, conn ) // make sure read worked
@@ -167,10 +177,42 @@ 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 // list answer
// TODO what happens if this is longer than 256 char?
resp = "la@" // begin crafting response
// file too big for single transmission
// initial header size is 5, la@1@, so counting that into
// the transmission size, the file must be longer than 251
// ( default ) bytes to reach this block of code
if len( qfile ) > ( tsize - 5 ) {
if command[1] == "init" { // first request
// add message number, delim, and the first
// transmittable bytes
resp = resp + "0@" + qfile[:( tsize - 5 )]
} else { // subsequent requests
// convert byte count to int
bytes, err := strconv.Atoi( command[1] )
check( err ) // make sure convert worked
// replace tx'd bytes and delim to new header
resp = resp + command[1] + "@"
rlen := len( resp ) // capture header length
// slices are always of size "txsize - header
// length", so find end byte
end := bytes + ( tsize - rlen )
// if end goes beyond the bounds of the list
if end > len( qfile ) {
// replace byte count with X to signal
// final message, concat the rest of the file,
// beginning with the start index
resp = "la@X@" + qfile[bytes:]
} else {
// get slice from start index to end, concat
// with response
resp = resp + qfile[num:end]
}
}
} else { // file is smaller than the tx size
// just concat entire list to send
resp = resp + qfile // list answer
}
case "ar": // /ar/, add request
// append new quote to list
qlist = append( qlist, command[1] )
@@ -178,7 +220,6 @@ func handle( conn net.Conn ) {
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
@@ -251,11 +292,16 @@ func handle( conn net.Conn ) {
// globals
var qlist []string // list of quotes
var qfile string // file object
var tsize int // size of transmission buffer
// main, create port and wait for connection
func main() {
// flag for default transmission size
flag.IntVar( &tsize, "s", 256, "transmission size ( bytes )" )
flag.Parse()
qfile = fread() // read quote file, init ( global ) list of quotes
service := ":1300" // create service on ip and port