init
This commit is contained in:
@@ -0,0 +1,9 @@
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all: clean build
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clean:
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rm colonel sentinel led
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build:
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go build colonel.go
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go build sentinel.go
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go build led.go
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@@ -0,0 +1,55 @@
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// =============================================================================
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// Auth: Alex Celani
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// File: boot.go
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// Revn: 06-23-2022 0.1
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// Func: Blink a light when the pi boots (or on login, but who cares)
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//
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// TODO: create
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// =============================================================================
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// CHANGE LOG
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// -----------------------------------------------------------------------------
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// 06-23-2022: init
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//
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// =============================================================================
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package main
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import (
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"github.com/stianeikeland/go-rpio"
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"os"
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"time"
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)
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/*
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Toggles a LED on physical pin 19 (mcu pin 10)
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Connect a LED with resistor from pin 19 to ground.
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*/
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// Use mcu pin 10, corresponds to physical pin 19 on the pi
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var pin rpio.Pin
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func main() {
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pin = rpio.Pin( 10 )
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// Open and map memory to access gpio, check for errors
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if err := rpio.Open(); err != nil {
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os.Exit(1)
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}
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// Unmap gpio memory when done
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defer rpio.Close()
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// Set pin to output mode
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pin.Output()
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// Toggle pin 20 times
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for i := 0; i < 4; i++ {
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pin.Toggle()
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time.Sleep(time.Second / 10)
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}
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}
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@@ -0,0 +1,100 @@
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// =============================================================================
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// Auth: Alex Celani
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// File: colonel.go
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// Revn: 06-23-2022 1.1
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// Func: Send message to another machine and then receive a single
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// response. Extremely tight bounds, not robust at all
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//
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// TODO: comment
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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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//*06-20-2022: changed name to reflect first draft of colonel.go
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// 06-23-2022: made input an infinite loop
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//
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// =============================================================================
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package main
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import (
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"net" // ResolveTCPAddr, DialTCP, conn.Write,Read
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"os" // Exit, Stdin, Stderr, Args
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"fmt" // Println, Print, Fprintf
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"bufio" // NewScanner, NewScanner.Scan,Text
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"strings" // ToLower
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"time" // Now, Sub
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)
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// quick function to take user input
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func input( ps1 string ) string {
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fmt.Print( ps1 ) // print prompt
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scanner := bufio.NewScanner( os.Stdin ) // link to stdin
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scanner.Scan() // pull data
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return strings.ToLower( scanner.Text() ) // return lower text
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}
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// quick error checking
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func check( err error ) {
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// if user checks an error, it better be nil
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if err != nil {
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// put error in string, print in stderr
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fmt.Fprintf( os.Stderr, "Fatal error: %s", err.Error() )
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os.Exit( 2 ) // quit
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}
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}
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func main() {
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// if len is not 2 ( ./name host:port ), print usage and quit
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if len( os.Args ) != 2 {
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fmt.Fprintf( os.Stderr, "Usage: %s host:port", os.Args[0] )
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os.Exit( 1 )
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}
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service := os.Args[1] // capture ip address and host
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// "resolve" ip & host according to TCP rules
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tcpAddr, err := net.ResolveTCPAddr( "tcp", service )
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check( err ) // check error
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// "dial" ( establish connection ) to destination ip & port
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// according to TCP rules
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// laddr = nil -> local address is localhost
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conn, err := net.DialTCP( "tcp", nil, tcpAddr )
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check( err ) // check error
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for { // loop forever
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var in string = input( ">> " ) // get user input
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start := time.Now() // start round trip timer
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// convert user input to bytes and send over connection
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_, err = conn.Write( []byte( in ) )
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check( err ) // check error
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var buf [512]byte // init byte array
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// read from connection into byte array
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// amount of bytes read stored in n
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//n, err := conn.Read( buf[0:] )
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n, err := conn.Read( buf[:] )
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check( err ) // check error
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t := time.Now() // stop round trip timer
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// convert read bytes into string and print
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fmt.Println( "<<", string( buf[:n] ) )
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fmt.Println() // newline to clean up a little
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fmt.Println( "rtt: ", t.Sub( start ) ) // print time
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}
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os.Exit( 0 ) // exeunt
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}
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@@ -0,0 +1,5 @@
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color;blue green red purple teal yellow white
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status;on off
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&&
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color;blue
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status;off
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@@ -0,0 +1,33 @@
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# ==============================================================================
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# Auth: Alex Celani
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# File: XXX.xx
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# Revn: MM-DD-YYYY 0.0
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# Func:
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#
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# TODO: create
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# ==============================================================================
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# CHANGE LOG
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# ------------------------------------------------------------------------------
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# MM-DD-YYYY: init
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#
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# ==============================================================================
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literally
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combine draft1 with draft2
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sentinel:: your whole job, tbh, is to forward to the correct node
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and there's really only one node
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change stuff like "plant humid" into "plant.humid" or
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"lamp color" into "lamp.color"
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node:: move real parsing here
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control RBG common anode led
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node name -> led
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fields ->^v led.color
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^ on
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^ off
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v status
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^v bright
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v list
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@@ -0,0 +1,217 @@
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// =============================================================================
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// Auth: Alex Celani
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// File: led.go
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// Revn: 06-26-2022 1.2
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// Func: receive data as an endpoint, send response back to middleman
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//
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// TODO:
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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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// 06-20-2022: changed name to reflect first draft of node.go
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//*06-22-2022: bug squashing and commenting
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// 06-23-2022: updated to produce three different colors
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// 06-26-2022: commented
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//
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// =============================================================================
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package main
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import (
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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
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"fmt" // Fprintf, Println
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"strings" // ToLower
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"github.com/stianeikeland/go-rpio" // talk to RasPi pins
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)
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// quick error checking
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func check( err error ) {
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// if user checks an error, it better be nil
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if err != nil {
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// put error in string, print in stderr
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fmt.Fprintf( os.Stderr, "Fatal error: %s", err.Error() )
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os.Exit( 2 ) // quit
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}
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}
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// parse incoming message, keep only second word
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func parse( recv string ) string {
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// split message over spaces
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keywords := strings.Split( recv, " " )
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return keywords[1] // return the second word
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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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var buf [512]byte // declare large byte array, store messages
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// iterate forever to always read over connection
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for {
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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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return // function so it can start again later
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}
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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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// split command into words for ease of parsing
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command := strings.Split( string( buf[:n] ), " " )
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if command[1] != "led" { // confirm message belongs here
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os.Exit( 2 ) // if not, exit
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}
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var resp string // declare response variable
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// TODO convert to switches?
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// len is 3 for "asK" commands
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if len( command ) == 3 {
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if command[2] == "color" {
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// if user wants color, return color
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resp = color
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} else if command[2] == "status" {
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// if user wants status, return status
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resp = status
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} else {
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// there are only those two fields
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resp = "usage unknown"
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}
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// len is 4 for tell commands
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} else if len( command ) == 4 {
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// if user wants to set color
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if command[2] == "color" {
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color = command[3] // set current color
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resp = color // return current color
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switch color {
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case "blue": // does user want blue?
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// turn blue on, turn rest off
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pinB.High()
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pinR.Low()
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pinG.Low()
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||||
case "red": // does user want red?
|
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// turn red on, turn rest off
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pinB.Low()
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||||
pinR.High()
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pinG.Low()
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case "green": // does user want green?
|
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// turn green on, turn rest off
|
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pinB.Low()
|
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pinR.Low()
|
||||
pinG.High()
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default: // color unknown
|
||||
// turn off
|
||||
pinB.Low()
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pinR.Low()
|
||||
pinG.Low()
|
||||
}
|
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// if user wants to set status
|
||||
} else if command[2] == "status" {
|
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status = command[3] // set current status
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resp = status // return current status
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||||
switch status {
|
||||
case "on": // does user want on?
|
||||
// default to red
|
||||
pinB.Low()
|
||||
pinR.High()
|
||||
pinG.Low()
|
||||
default: // anything else, like off
|
||||
// default to off
|
||||
pinB.Low()
|
||||
pinR.Low()
|
||||
pinG.Low()
|
||||
}
|
||||
// user entered something else entirely
|
||||
} else {
|
||||
resp = "usage unknown"
|
||||
}
|
||||
// no other lengths are valid
|
||||
} else {
|
||||
os.Exit( 2 ) // exit in this case
|
||||
}
|
||||
|
||||
fmt.Println( "answer: ", resp ) // print response
|
||||
|
||||
// write that response back to original client
|
||||
_, err = conn.Write( []byte( resp ) )
|
||||
if err != nil { // erroring on write will simply leave the
|
||||
return // function so it can start again later
|
||||
}
|
||||
|
||||
fmt.Println( "sent: ", resp ) // print response
|
||||
}
|
||||
}
|
||||
|
||||
|
||||
//var params = make( map[string]string )
|
||||
//var states = make( map[string]string )
|
||||
var pinR rpio.Pin // declare red led pin
|
||||
var pinG rpio.Pin // declare green led pin
|
||||
var pinB rpio.Pin // declare blue led pin
|
||||
var color string // declare color variable
|
||||
var status string // declare status variable
|
||||
|
||||
|
||||
func main() {
|
||||
|
||||
// initialize pins to GPIO 11, 9, and 25
|
||||
pinR = rpio.Pin( 11 )
|
||||
pinG = rpio.Pin( 9 )
|
||||
pinB = rpio.Pin( 25 )
|
||||
|
||||
if err := rpio.Open(); err != nil {
|
||||
// on error, print error and exit
|
||||
fmt.Println(err)
|
||||
os.Exit(1)
|
||||
}
|
||||
|
||||
// Unmap gpio memory when done
|
||||
defer rpio.Close()
|
||||
|
||||
// Set pins to output mode
|
||||
pinR.Output()
|
||||
pinG.Output()
|
||||
pinB.Output()
|
||||
|
||||
// ip:port
|
||||
// ip doesn't exist, implies localhost
|
||||
service := ":1202" // capture ip address and host
|
||||
|
||||
// "resolve" ip & host according to TCP rules
|
||||
tcpAddr, err := net.ResolveTCPAddr( "tcp", service )
|
||||
check( err ) // check error
|
||||
|
||||
// bind and "listen" to ip and port, according to tcp rules
|
||||
listener, err := net.ListenTCP( "tcp", tcpAddr )
|
||||
check( err ) // check error
|
||||
|
||||
// iterate forever
|
||||
// TODO i mean i can totally make this more user friendly
|
||||
for {
|
||||
// accept a connection that makes its way to bound port
|
||||
conn, err := listener.Accept()
|
||||
if err != nil { // if connection fails...
|
||||
continue // don't quit program, not fatal error
|
||||
}
|
||||
|
||||
// asynchronous function to handle connection to client
|
||||
go handleClient( conn )
|
||||
}
|
||||
}
|
||||
|
||||
@@ -0,0 +1,156 @@
|
||||
// =============================================================================
|
||||
// Auth: Alex Celani
|
||||
// File: sentinel.go
|
||||
// Revn: 06-26-2022 1.2
|
||||
// Func: Receive message, determine recipient, forward, get response,
|
||||
// forward back
|
||||
//
|
||||
// TODO:
|
||||
// =============================================================================
|
||||
// CHANGE LOG
|
||||
// -----------------------------------------------------------------------------
|
||||
// 05-04-2022: init
|
||||
// 05-05-2022: commented
|
||||
// 05-10-2022: added argument 'n' to alter() for halving purposes
|
||||
// changed passed value to alter()/forward() a slice
|
||||
// 06-20-2022: changed name to reflect first draft of sentinel.go
|
||||
//*06-22-2022: bug fixing and commenting
|
||||
// 06-23-2022: removed call to parse
|
||||
// 06-26-2022: refined a new route() function to check for destination
|
||||
// validity
|
||||
//
|
||||
// =============================================================================
|
||||
|
||||
package main
|
||||
|
||||
import (
|
||||
"net" // ResolveTCPAddr, DialTCP, conn.Write,Read,Close
|
||||
// ListenTCP, listener.Accept
|
||||
"os" // Exit, Stderr, Stdin, Args
|
||||
"fmt" // Println, Fprintf
|
||||
"strings" // ToLower, ToUpper
|
||||
)
|
||||
|
||||
|
||||
// quick error checking
|
||||
func check( err error ){
|
||||
// if user checks an error, it better be nil
|
||||
if err != nil {
|
||||
// put error in string, print to stderr
|
||||
fmt.Fprintf( os.Stderr, "Fatal error: %s", err.Error() )
|
||||
os.Exit( 1 ) // quit
|
||||
}
|
||||
}
|
||||
|
||||
|
||||
// read the given message and route to the right endpoint
|
||||
func route( recv []string ) bool {
|
||||
return recv[1] == "led" // only option right now is led
|
||||
}
|
||||
|
||||
|
||||
// function to send message to third party and get response
|
||||
func send( toSend string ) string {
|
||||
// ip:port
|
||||
// ip doesn't exist, implies localhost
|
||||
service := ":1202" // capture ip address and host
|
||||
|
||||
// "resolve" ip & host according to TCP rules
|
||||
tcpAddr, err := net.ResolveTCPAddr( "tcp", service )
|
||||
check( err ) // check error
|
||||
|
||||
// "dial" ( establish connection ) to destination ip & port
|
||||
// according to TCP rules
|
||||
// laddr = nil -> local address is localhost
|
||||
conn, err := net.DialTCP( "tcp", nil, tcpAddr )
|
||||
check( err ) // check error
|
||||
|
||||
defer conn.Close() // barring any error, still close connection
|
||||
|
||||
// convert user input to bytes and send over connection
|
||||
_, err = conn.Write( []byte( toSend ) )
|
||||
check( err ) // check error
|
||||
|
||||
var buf [512]byte // init byte array
|
||||
// read from connection into byte array
|
||||
// amount of bytes read stored in n
|
||||
//n, err := conn.Read( buf[0:] )
|
||||
n, err := conn.Read( buf[0:] )
|
||||
check( err ) // check error
|
||||
|
||||
return string( buf[:n] ) // return only written bytes
|
||||
}
|
||||
|
||||
|
||||
// function to handle incoming connections
|
||||
func handleClient( conn net.Conn ) {
|
||||
defer conn.Close() // barring any error, still close connection
|
||||
|
||||
var buf [512]byte // declare large byte array, store messages
|
||||
|
||||
// iterate forever to always read over connection
|
||||
for {
|
||||
// read n bytes from connection into buffer
|
||||
n, err := conn.Read( buf[0:] )
|
||||
if err != nil { // erroring on read will simply leave the
|
||||
return // function so it can start again later
|
||||
}
|
||||
|
||||
// instantiate receipt variable
|
||||
var recv string = string( buf[:n] )
|
||||
|
||||
// print recv'd message
|
||||
// string() only works on byte SLICES so [:] is required
|
||||
fmt.Println( "recv: ", recv )
|
||||
|
||||
keywords := strings.Split( recv, " " )
|
||||
|
||||
// parse the input in some way
|
||||
var resp string // declare response variable
|
||||
if route( keywords ) { // is destination valid?
|
||||
resp = send( recv ) // send message and get response
|
||||
// if user wants a list of endpoints
|
||||
} else if keywords[1] == "list" {
|
||||
resp = "led" // return list of endpoints
|
||||
}
|
||||
|
||||
|
||||
fmt.Println( "node: ", resp ) // print response
|
||||
|
||||
// write that response back to original client
|
||||
_, err = conn.Write( []byte( resp ) )
|
||||
if err != nil { // erroring on write will simply leave the
|
||||
return // function so it can start again later
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
|
||||
func main() {
|
||||
|
||||
// ip:port
|
||||
// ip doesn't exist, implies localhost
|
||||
service := ":1201" // capture ip address and host
|
||||
|
||||
// "resolve" ip & host according to TCP rules
|
||||
tcpAddr, err := net.ResolveTCPAddr( "tcp", service )
|
||||
check( err ) // check error
|
||||
|
||||
// bind and "listen" to ip and port, according to tcp rules
|
||||
listener, err := net.ListenTCP( "tcp", tcpAddr )
|
||||
check( err ) // check error
|
||||
|
||||
// iterate forever
|
||||
// TODO i mean i can totally make this more user friendly
|
||||
for {
|
||||
// accept a connection that makes its way to bound port
|
||||
conn, err := listener.Accept()
|
||||
if err != nil { // if connection fails...
|
||||
continue // don't quit program, not fatal error
|
||||
}
|
||||
|
||||
// asynchronous function to handle connection to client
|
||||
go handleClient( conn )
|
||||
}
|
||||
}
|
||||
|
||||
Reference in New Issue
Block a user