draft 3, stores receipt in file
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+3
-2
@@ -1,7 +1,7 @@
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// =============================================================================
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// Auth: Alex Celani
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// File: gsp.go
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// Revn: 07-18-2023 2.0
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// Revn: 07-20-2023 2.0
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// Func: asynchronously receive messages from another program, print
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//
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// TODO: create
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@@ -15,7 +15,8 @@
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// current time
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// write output to a logfile
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// moved file writing to AFTER checking for fin
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//*07-20-2023:
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//*07-20-2023: added calls to os.Create(), file.Write(), etc
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//
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// =============================================================================
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package main
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+41
-56
@@ -1,38 +1,39 @@
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// =============================================================================
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// Auth: Alex Celani
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// File: gsp.go
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// Revn: 07-13-2023 0.4
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// File: gps.go
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// Revn: 07-25-2023 3.0
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// Func: asynchronously receive messages from another program, print
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//
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// TODO: create
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// TODO: add LED
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// add flags
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// =============================================================================
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// CHANGE LOG
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// -----------------------------------------------------------------------------
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// 05-04-2022: init
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// 05-09-2022: began commenting
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// 05-10-2022: finished commenting
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// added alter() and forward()
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// made passed value to alter()/forward() a slice
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// changed refs to recv byte array to slice of n bytes
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// 07-13-2023: copied over, removed call to alter()/forward()
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//*07-13-2023: copied over, removed call to alter()/forward()
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// removed any call to write
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// put read and print in a for loop
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// wrote getFileName() to create a filename based off
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// current time
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// write output to a logfile
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// moved file writing to AFTER checking for fin
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//*07-20-2023: added calls to os.Create(), file.Write(), etc
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// 07-21-2023: tested filewriting stuff, no avail
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// 07-24-2023: added bufio import and buffered file writing
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//*07-25-2023: commented bufio stuffs
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//
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// =============================================================================
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package main
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import (
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"bufio" // NewWriter, Write, Writer.Flush
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"net" // ResolveTCPAddr, conn.Write,Read,Close
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// ListenTCP, listener.Accept
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"os" // Args, Stderr, Exit, Create, Write
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"os" // Args, Stderr, Exit, Create, Write, Close,
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// WriteString
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"fmt" // Fprintf, Println
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"strings" // ToLower, Compare
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"time" // Now, Year, Month, Day, Hour, Minute, Second
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"time" // Now, Format
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)
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@@ -52,20 +53,20 @@ func getFileName() string{
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t := time.Now()
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// format as YYYYMMDDHHmmss.gps
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return t.Format( "20060102150405" ) + ".gps"
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//return name + // return name
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}
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// function to handle incoming connections
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func handleClient( conn net.Conn ) {
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defer conn.Close() // barring any error, still close connection
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// defer file.Close() // barring any error, still close connection
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var buf [512]byte // declare large byte array, store messages
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// debug printing stuff
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// fmt.Println( "handling" )
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// iterate forever to always read over connection
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for {
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//defer file.Close()
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// read n bytes from connection into buffer
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n, err := conn.Read( buf[0:] )
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if err != nil { // erroring on read will simply leave the
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@@ -74,56 +75,40 @@ func handleClient( conn net.Conn ) {
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// print recv'd message
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// string() only works on byte SLICES so [:] is required
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fmt.Println( "recv: ", string( buf[:n] ) )
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// debug print
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// fmt.Println( "recv: ", string( buf[:n] ) )
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// if recv'd message is start, create and open file
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// essentially a case statement for conn.Read, Compare makes
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// it hard to do that
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// check to see if buf[:n] is start
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if strings.Compare( string( buf[:n] ), "start" ) == 0 {
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filename := getFileName() // get filename
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file, err = os.Create( filename ) // create new file
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check( err ) // make sure it worked
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defer file.Close()
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open = true
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break
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}
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if !open {
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break
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}
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// if recv'd message is fin, break forloop
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if strings.Compare( string( buf[:n] ), "fin" ) == 0 {
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file.Close()
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filename := getFileName() // get name of file
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file, err = os.Create( filename ) // create new file
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check( err ) // make sure file creation worked
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writer = bufio.NewWriter( file ) // create filewriter
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// check to see if buf[:n] is fin
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} else if strings.Compare( string( buf[:n] ), "fin" ) == 0 {
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// debug print
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// fmt.Println( "premature file closing" )
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file.Close() // close file
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// possibly strike exit...
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os.Exit( 2 ) // quit
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// if conn.Read is not start or fin, it's data
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} else {
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// write info to file
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_, err = writer.Write( buf[:n] )
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check( err ) // make sure write worked
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err = writer.Flush() // flush write to file
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check( err ) // make sure write worked
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// debug print
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// fmt.Println( "writing" )
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}
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file, err = os.OpenFile( filename, os.O_WRONLY, 0644 )
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check( err )
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// write info to file
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_, err = file.Write( buf[:n] )
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check( err ) // make sure write worked
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// write newline
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_, err = file.WriteString( "\n" )
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check( err ) // make sure write worked
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file.Sync()
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file.Close()
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/*
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// write that response back to original client
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_, err = conn.Write( []byte( send ) )
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if err != nil { // erroring on write will simply leave the
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return // function so it can start again later
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}
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*/
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//fmt.Println( "sent: ", send ) // print response
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}
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}
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var file *os.File
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var filename string
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var open bool
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var writer *bufio.Writer
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func main() {
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