Update randopix.nimble

.github/workflows/build.yml

@@ -0,0 +1,30 @@
+name: Build randopix
+# This workflow is triggered on pushes to the repository.
+on:
+  push:
+    branches:
+      - build
+
+jobs:
+  build:
+    name: Build 64 Bit Linux
+    # This job runs on Linux
+    runs-on: ubuntu-latest
+    steps:
+    - name: Install GTK packages
+      run: sudo apt install gir1.2-gtk-3.0 gir1.2-graphene-1.0 gir1.2-gtksource-3.0 gir1.2-vte-2.91 gir1.2-notify-0.7 gir1.2-gst-plugins-bad-1.0
+    - uses: actions/checkout@master
+    - name: Cache choosenim
+      id: cache-choosenim
+      uses: actions/cache@v1
+      with:
+        path: ~/.choosenim
+        key: ${{ runner.os }}-choosenim-stable
+    - name: Cache nimble
+      id: cache-nimble
+      uses: actions/cache@v1
+      with:
+        path: ~/.nimble
+        key: ${{ runner.os }}-nimble-stable
+    - uses: jiro4989/setup-nim-action@v1.0.2
+    - run: nimble build -Y

.gitignore

@@ -1 +1,12 @@
-bin/
+# Ignore all
+*
+
+# Unignore all with extensions
+!*.*
+
+# Unignore all dirs
+!*/
+
+### Above combination will ignore all files without extension ###
+bin/
+.vscode/

README.md

@@ -0,0 +1,49 @@
+# randopix
+## Usage
+### Server
+The server is run with an inital mode. All settings can later be changed with the client.
+```
+randopix
+
+Version 0.1 - Display random images from different sources
+
+Usage:
+  randopix [options]
+
+Options:
+  -m, --mode=MODE            The image source mode. Possible values: [none, foxes, inspiro, file]
+  -p, --path=PATH            Path to a directory with images for the 'file' mode
+  -t, --timeout=TIMEOUT      Seconds before the image is refreshed (default: 300)
+  -w, --windowed             Do not start in fullscreen mode
+  -v, --verbose              Show more information
+  -h, --help                 Show this help
+```
+### Client
+The `pixctrl` client is used to issue commands to a running server.
+Per default the client will try to connect to a server running on the same maschine. Use the `-s HOSTNAME` option to control a server over the network.
+```
+pixctrl
+
+Control utilitiy for randopix
+
+Usage:
+  pixctrl [options] COMMAND
+
+Commands:
+
+  refresh          Force image refresh now
+  timeout          Set timeout in seconds before a new image is displayed
+  mode             Change the display mode. Possible values: [none, foxes, inspiro, file]
+
+Options:
+  -s, --server=SERVER        Host running the randopix server (default: 127.0.0.1)
+  -p, --port=PORT            Port to connect to the randopix server (default: 5555)
+  -h, --help                 Show this help
+```
+## Build
+Install the [Nim Compiler](https://nim-lang.org/install.html).
+
+Use this command to install the dependencies and build the program:
+```
+$ nimble build
+```

randopix.nimble

@@ -6,13 +6,13 @@ author        = "luxick"
 description   = "Play an image slide show from different sources"
 license       = "GPL-2.0"
 srcDir        = "src"
-bin           = @["randopics"]
+bin           = @["randopix", "pixctrl"]
 
 # Dependencies
-requires "nim >= 1.0.0", "gintro <= 0.5.5"
+requires "nim >= 1.0.0", "gintro <= 0.5.5", "argparse >=0.10.1"
 
 task debug, "Compile debug version":
-  exec "nim c --out:bin/randopics src/randopics.nim"
+  exec "nim c -d:debug --debugger:native --out:randopix src/randopix.nim"
 
 task release, "Compile release version":
-  exec fmt"nim c -d:release --out:bin/{version}/randopics src/randopics.nim"
+  exec fmt"nim c -d:release --out:randopix-{version} src/randopix.nim"

src/app.css

@@ -0,0 +1,11 @@
+window {
+  background: black;
+  font-size: 30px;
+}
+label {
+  background-color: #fff;
+  border: 2px solid gray;
+  border-radius: 5px;
+  margin: 10px;
+  padding: 10px;
+}

src/common.nim

@@ -0,0 +1,41 @@
+import json
+
+const
+  defaultPort* = 5555     ## Default port at which the control server will run
+
+type
+  OpResult* = object of RootObj ## Result object for signalling failure state across proc calls
+    success*: bool              ## Indicating if the opration was successfull
+    errorMsg*: string           ## Error meassge in case the operation failed
+
+  Mode* {.pure.} = enum   ## Options for the display mode
+    None = "none"         ## No images will be displayed
+    Foxes = "foxes"       ## Some nice foxes
+    Inspiro = "inspiro"   ## Inspiring nonsense
+    File = "file"         ## Images from a local path
+
+  Command* = enum
+    cClose = "close"       ## Closes the control server and exists the applicaiton
+    cRefresh = "refresh"   ## Force refresh of the image now
+    cTimeout = "timeout"   ## Set image timeout to a new value
+    cMode = "mode"         ## Change the servers display mode
+
+  CommandMessage* = object of RootObj
+    command*: Command     ## Command that the application should execute
+    parameter*: string    ## Optional parameter for the command
+
+proc newOpResult*(): OpResult =
+  OpResult(success: true)
+
+proc newOpResult*(msg: string): OpResult =
+  OpResult(success: false, errorMsg: msg)
+
+proc newCommand*(c: Command, p: string = ""): CommandMessage =
+  CommandMessage(command: c, parameter: p)
+
+proc wrap*(msg: CommandMessage): string =
+  $(%msg) & "\r\L"
+
+proc enumToStrings*(en: typedesc): seq[string] =
+  for x in en:
+    result.add $x

src/pixctrl.nim

@@ -0,0 +1,52 @@
+import strutils, net
+import argparse
+import common
+
+const modeHelp = "Change the display mode. Possible values: [$1]" % Mode.enumToStrings().join(", ")
+
+var socket = newSocket()
+
+proc sendCommand*(server, port: string, msg: CommandMessage) =
+  socket.connect(server, Port(port.parseInt))
+  if not socket.trySend(msg.wrap):
+    echo "Cannot send command: ", msg
+  socket.close()
+
+proc switchMode*(server, port: string, mode: string) =
+  try:
+    discard parseEnum[Mode](mode)
+  except ValueError:
+    echo "Invalid mode: ", mode
+    echo "Possible values: [$1]" % Mode.enumToStrings().join(", ")
+    return
+  let c = newCommand(cMode, mode)
+  sendCommand(server, port, c)
+
+when isMainModule:
+  var p = newParser("pixctrl"):
+    help("Control utilitiy for randopix")
+    option("-s", "--server", help="Host running the randopix server", default="127.0.0.1")
+    option("-p", "--port", help="Port to connect to the randopix server", default = $defaultPort)
+
+    command($cRefresh):
+      help("Force image refresh now")
+      run:
+        let c = newCommand(cRefresh)
+        sendCommand(opts.parentOpts.server, opts.parentOpts.port, c)
+
+    command($cTimeout):
+      help("Set timeout in seconds before a new image is displayed")
+      arg("seconds", default = "300")
+      run:
+        let c = newCommand(cTimeout, opts.seconds)
+        sendCommand(opts.parentOpts.server, opts.parentOpts.port, c)
+
+    command($cMode):
+      help(modeHelp)
+      arg("mode")
+      run:
+        switchMode(opts.parentOpts.server, opts.parentOpts.port, opts.mode)
+  try:
+    p.run(commandLineParams())
+  except:
+    echo p.help

src/providers.nim

@@ -0,0 +1,157 @@
+import os, sets, random, httpClient, json, strformat, options
+import gintro/[gdkpixbuf, gobject]
+import common
+
+const
+  supportedExts = @[".png", ".jpg", ".jpeg"]
+  foxesUrl = "https://randomfox.ca/floof/"
+  inspiroUrl = "http://inspirobot.me/api?generate=true"
+  tmpFile = "/tmp/randopix_tmp.png"
+
+type
+  FileOpResult* = object of OpResult
+    file*: string
+
+  ImageProvider* = ref object of RootObj
+    ## Manages images that should be displayed
+    verbose: bool         ## Additional logging for the image provider
+    mode* : Mode          ## Selects the API that is used to get images
+    path*: Option[string] ## Path on the local file syetem that will be used in `file` mode
+    exts: HashSet[string] ## Allowed extensions that the `file` mode will display
+    files: seq[string]    ## Currently loaded list of images in `file` mode
+
+var
+  client = newHttpClient()  ## For loading images from the web
+
+########################
+# Constructors
+########################
+
+proc newImageProvider(verbose: bool, mode: Mode, path: Option[string]): ImageProvider =
+  randomize()
+  ImageProvider(verbose: verbose, mode: mode, path: path, exts: supportedExts.toHashSet)
+
+proc newImageProvider*(verbose: bool): ImageProvider =
+  newImageProvider(verbose, Mode.None, none(string))
+
+proc newImageProvider*(verbose: bool, path: string): ImageProvider =
+  newImageProvider(verbose, Mode.None, some(path))
+
+proc newImageProvider*(verbose: bool, mode: Mode): ImageProvider =
+  newImageProvider(verbose, mode, none(string))
+
+proc newImageProvider*(verbose: bool, mode: Mode, path: string): ImageProvider =
+  newImageProvider(verbose, mode, some(path))
+
+proc newFileOpResultError(msg: string): FileOpResult =
+  FileOpResult(success: false, errorMsg: msg)
+
+proc newFileOpResult(file: string): FileOpResult =
+  FileOpResult(success: true, file: file)
+
+########################
+# Utilities
+########################
+
+proc log(ip: ImageProvider, msg: string) =
+  if ip.verbose: echo msg
+
+########################
+# Image Provider procs
+########################
+
+proc getFox(ip: ImageProvider): FileOpResult =
+  ## Download image from the fox API
+  try:
+    let urlData = client.getContent(foxesUrl)
+    let info = parseJson(urlData)
+    let imageData = client.getContent(info["image"].getStr)
+    let dlFile = fmt"{tmpFile}.download"
+    writeFile(dlFile, imageData)
+    return newFileOpResult(dlFile)
+  except JsonParsingError:
+    ip.log fmt"Error while fetching from fox API: {getCurrentExceptionMsg()}"
+    return newFileOpResultError("Json parsing error")
+  except KeyError:
+    ip.log fmt"No image in downloaded data: {getCurrentExceptionMsg()}"
+    return newFileOpResultError("No image from API")
+
+proc getInspiro(ip: ImageProvider): FileOpResult =
+  ## Download and save image from the inspiro API
+  try:
+    let imageUrl = client.getContent(inspiroUrl)
+    ip.log fmt"Downloading inspiro image from: '{imageUrl}'"
+    let imageData = client.getContent(imageUrl)
+    let dlFile = fmt"{tmpFile}.download"
+    writeFile(dlFile,imageData)
+    return newFileOpResult(dlFile)
+  except:
+    ip.log fmt"Unexpected error while downloading: {getCurrentExceptionMsg()}"
+    return newFileOpResultError(getCurrentExceptionMsg())
+
+proc getLocalFile(ip: var ImageProvider): FileOpResult =
+  ## Provide an image from a local folder
+
+  # First, check if there are still images left to be loaded.
+  # If not reread all files from the path
+  if ip.files.len < 1:
+    if ip.path.isNone:
+      return newFileOpResultError("No path for image loading")
+    ip.log "Reloading file list..."
+    for file in walkDirRec(ip.path.get):
+      let split = splitFile(file)
+      if ip.exts.contains(split.ext):
+        ip.files.add(file)
+    ip.log fmt"Loaded {ip.files.len} files"
+    shuffle(ip.files)
+
+  # Remove the current file after
+  result = newFileOpResult(ip.files[0])
+  ip.files.delete(0)
+
+proc getFileName(ip: var ImageProvider): FileOpResult =
+  ## Get the temporary file name of the next file to display
+  case ip.mode
+  of Mode.File:
+    return ip.getLocalFile()
+  of Mode.Foxes:
+    return ip.getFox()
+  of Mode.Inspiro:
+    return ip.getInspiro()
+  else:
+    return newFileOpResultError("Not implemented")
+
+########################
+# Exported procs
+########################
+
+proc next*(ip: var ImageProvider, width, height: int): FileOpResult =
+  ## Uses the image provider to get a new image ready to display.
+  ## `width` and `height` should be the size of the window.
+  if ip.mode == Mode.None:
+    return newFileOpResultError("No mode active")
+
+  let op = ip.getFileName()
+  if not op.success: return op
+
+  var rawPixbuf = newPixbufFromFile(op.file)
+  # resize the pixbuf to best fit on screen
+  var w, h: int
+  if (width > height):
+    h = height
+    w = ((rawPixbuf.width * h) / rawPixbuf.height).toInt
+  else:
+    w = width
+    h = ((rawPixbuf.height * w) / rawPixbuf.width).toInt
+  var pixbuf = rawPixbuf.scaleSimple(w, h, InterpType.bilinear)
+  # The pixbuf is written to disk and loaded again once because
+  # directly setting the image from a pixbuf will leak memory
+  let saved = pixbuf.savev(tmpFile, "png", @[])
+  if not saved:
+    return newFileOpResultError("Error while saving temporary image")
+
+  # GTK pixbuf leaks memory when not manually decreasing reference count
+  pixbuf.genericGObjectUnref()
+  rawPixbuf.genericGObjectUnref()
+
+  newFileOpResult(tmpFile)

src/randopics.nim

@@ -1,87 +0,0 @@
-import httpClient, json
-import gintro/[gtk, glib, gobject, gio, gdkpixbuf]
-
-var
-  client = newHttpClient()
-  window: ApplicationWindow
-  fullscreen = true
-
-const 
-  floofUrl = "https://randomfox.ca/floof/"
-
-proc downloadImage(): Pixbuf =
-  let urlData = client.getContent(floofUrl)
-  let info = parseJson(urlData)
-  let imageData = client.getContent(info["image"].getStr)
-  let loader = newPixbufLoader()
-  discard loader.write(imageData)
-  loader.getPixbuf()
-
-proc resizeImage(pixbuf: Pixbuf): Pixbuf = 
-  var wWidth, wHeight, width, height: int
-  window.getSize(wWidth, wHeight)
-
-  if (wWidth > wHeight):
-    height = wHeight
-    width = ((pixbuf.width * height) / pixbuf.height).toInt 
-  else:
-    width = wWidth
-    height = ((pixbuf.height * width) / pixbuf.width).toInt
-
-  pixbuf.scaleSimple(width, height, InterpType.bilinear)
-
-proc updateImage(action: SimpleAction; parameter: Variant; widget: Image) =
-  var pixbuf = downloadImage()
-  pixbuf = pixbuf.resizeImage()
-  widget.setFromPixbuf(pixbuf)
-
-proc toggleFullscreen(action: SimpleAction; parameter: Variant; window: ApplicationWindow) =
-  if fullscreen:
-    window.unfullscreen
-  else:
-    window.fullscreen
-  fullscreen = not fullscreen
-
-proc quit(action: SimpleAction; parameter: Variant; app: Application) = 
-    app.quit()
-  
-proc appActivate(app: Application) =
-  window = newApplicationWindow(app)
-  window.title = "Randopics"
-  window.setKeepAbove(true)
-  let cssProvider = newCssProvider()
-  let data = "window { background: black; }"
-  discard cssProvider.loadFromData(data)
-  let styleContext = window.getStyleContext()
-  styleContext.addProvider(cssProvider, STYLE_PROVIDER_PRIORITY_USER)
-
-  let imageWidget = newImage()
-  window.add(imageWidget)
-
-  if fullscreen:
-    window.fullscreen
-
-  let fullscreenAction = newSimpleAction("fullscreen")
-  discard fullscreenAction.connect("activate", toggleFullscreen, window)
-  app.setAccelsForAction("win.fullscreen", "F")
-  window.actionMap.addAction(fullscreenAction)
-
-  let quitAction = newSimpleAction("quit")
-  discard quitAction.connect("activate", quit, app)
-  app.setAccelsForAction("win.quit", "Escape")
-  window.actionMap.addAction(quitAction)
-
-  let updateImageAction = newSimpleAction("update")
-  discard updateImageAction.connect("activate", updateImage, imageWidget)
-  app.setAccelsForAction("win.update", "U")
-  window.actionMap.addAction(updateImageAction)
-
-  window.showAll
-
-proc main =
-  let app = newApplication("org.gtk.example")
-  connect(app, "activate", appActivate)
-  discard run(app)
-
-when isMainModule:
-  main()

src/randopics.nim.cfg

@@ -1,2 +0,0 @@
-threads:on
-d:ssl

src/randopix.nim

@@ -0,0 +1,246 @@
+import os, options, strformat
+import gintro/[glib, gobject, gtk, gio]
+import gintro/gdk except Window
+import argparse except run
+import providers, server, common
+
+const
+  css = slurp("app.css")
+  version = "0.1"
+
+type
+  Args = ref object
+    fullscreen: bool    ## Applicaion is show in fullscreen mode
+    verbose: bool       ## More debug information in notification label
+    timeout: int        ## Milliseconds between image refreshes
+
+var
+  imageProvider: ImageProvider  ## Gets images from the chosen source
+  args: Args                    ## The parsed command line args
+  updateTimeout: int            ## ID of the timeout that updates the images
+  # Widgets
+  window: ApplicationWindow
+  label: Label
+  # Server vor recieving commands from external tools
+  serverWorker: system.Thread[ServerArgs]
+
+proc log(things: varargs[string, `$`]) =
+  if args.verbose:
+    echo things.join()
+
+proc notify(label: Label, message: string = "") =
+  ## Shows the notification box in the lower left corner.
+  ## If no message is passed, the box will be hidden
+  label.text = message
+  if (message == ""):
+    label.hide
+  else:
+    label.show
+
+proc newArgs(): Option[Args] =
+  let p = newParser("randopix"):
+    help(fmt"Version {version} - Display random images from different sources")
+    option("-m", "--mode", help="The image source mode.", choices=enumToStrings(Mode))
+    option("-p", "--path", help="Path to a directory with images for the 'file' mode")
+    option("-t", "--timeout", help="Seconds before the image is refreshed", default="300")
+    flag("-w", "--windowed", help="Do not start in fullscreen mode")
+    flag("-v", "--verbose", help="Show more information")
+
+  try:
+    let opts = p.parse(commandLineParams())
+
+    # Catch the help option. Do nothing more
+    if opts.help:
+      return
+
+    # Parse the starting mode
+    var startMode: Mode
+    try:
+      startMode= parseEnum[Mode](opts.mode)
+    except ValueError:
+      startMode = Mode.None
+
+    # Create the image provider
+    if opts.path != "":
+      imageProvider = newImageProvider(opts.verbose, startMode, opts.path)
+    else:
+      imageProvider = newImageProvider(opts.verbose, startMode)
+
+    ## Timeout is given in seconds as an argument
+    var timeout = 3000
+    try:
+      timeout = opts.timeout.parseInt * 1000
+    except ValueError:
+      raise newException(UsageError, fmt"Invalid timeout value: {opts.timeout}")
+
+    return some(Args(
+      fullscreen: not opts.windowed,
+      verbose: opts.verbose,
+      timeout: timeout))
+  except:
+    echo p.help
+
+proc updateImage(image: Image): bool =
+  ## Updates the UI with a new image
+  try:
+    if args.verbose: log "Refreshing..."
+
+    if imageProvider.mode == Mode.None:
+      log "No display mode"
+      label.notify "No mode selected"
+      return true
+
+    var wWidth, wHeight: int
+    window.getSize(wWidth, wHeight)
+
+    let op = imageProvider.next(wWidth, wHeight)
+    result = op.success
+    if not op.success:
+      label.notify op.errorMsg
+      return
+
+    image.setFromFile(op.file)
+    label.notify
+  except:
+    let
+      e = getCurrentException()
+      msg = getCurrentExceptionMsg()
+    log "Got exception ", repr(e), " with message ", msg
+    label.notify "Error while refreshing image, retrying..."
+    return false
+
+proc timedUpdate(image: Image): bool =
+  discard updateImage(image);
+  updateTimeout = int(timeoutAdd(uint32(args.timeout), timedUpdate, image))
+  return false
+
+proc forceUpdate(action: SimpleAction; parameter: Variant; image: Image): void =
+  log "Refreshing image..."
+  label.notify "Refreshing image..."
+  if updateTimeout > 0:
+    discard updateTimeout.remove
+  updateTimeout = int(timeoutAdd(500, timedUpdate, image))
+
+proc checkServerChannel(image: Image): bool =
+  ## Check the channel from the control server for incomming commands
+  let tried = chan.tryRecv()
+
+  if tried.dataAvailable:
+    let msg: CommandMessage = tried.msg
+    log "Recieved command: ", msg.command
+
+    case msg.command
+    of cRefresh:
+      forceUpdate(nil, nil, image)
+
+    of cTimeout:
+      let val = msg.parameter.parseInt * 1000
+      log "Setting timeout to ", val
+      args.timeout = val
+      discard updateTimeout.remove
+      updateTimeout = int(timeoutAdd(uint32(args.timeout), timedUpdate, image))
+
+    of cMode:
+      try:
+        let mode = parseEnum[Mode](msg.parameter)
+        log "Switching mode: ", mode
+        imageProvider.mode = mode
+      except ValueError:
+        log "Invalid mode: ", msg.parameter
+
+    else:
+      log "Command ignored: ", msg.command
+
+  sleep(100)
+  result = true
+
+proc toggleFullscreen(action: SimpleAction; parameter: Variant; window: ApplicationWindow) =
+  ## Fullscreen toggle event
+  if args.fullscreen:
+    window.unfullscreen
+  else:
+    window.fullscreen
+  args.fullscreen = not args.fullscreen
+
+proc cleanUp(w: ApplicationWindow, app: Application) =
+  ## Stop the control server and exit the GTK application
+  log "Stopping control server..."
+  closeServer()
+  serverWorker.joinThread()
+  chan.close()
+  log "Server stopped."
+  app.quit()
+
+proc quit(action: SimpleAction; parameter: Variant; app: Application) =
+  ## Application quit event
+  cleanUp(window, app)
+
+proc appActivate(app: Application) =
+  # Parse arguments from the command line
+  let parsed = newArgs()
+  if parsed.isNone:
+    return
+  else:
+    args = parsed.get
+
+  window = newApplicationWindow(app)
+  window.title = "randopix"
+  window.setKeepAbove(false)
+  window.setDefaultSize(800, 600)
+
+  # Custom styling for e.g. the background color CSS data is in the "style.nim" module
+  let provider = newCssProvider()
+  discard provider.loadFromData(css)
+  addProviderForScreen(getDefaultScreen(), provider, STYLE_PROVIDER_PRIORITY_USER)
+
+  # Create all windgets we are gonna use
+  label = newLabel("Starting...")
+  label.halign = Align.`end`
+  label.valign = Align.`end`
+
+  let container = newOverlay()
+  container.addOverlay(label)
+  window.add(container)
+
+  let image = newImage()
+  container.add(image)
+
+  if args.fullscreen:
+    window.fullscreen
+
+  ## Connect the GTK signals to the procs
+  let fullscreenAction = newSimpleAction("fullscreen")
+  discard fullscreenAction.connect("activate", toggleFullscreen, window)
+  app.setAccelsForAction("win.fullscreen", "F")
+  window.actionMap.addAction(fullscreenAction)
+
+  let quitAction = newSimpleAction("quit")
+  discard quitAction.connect("activate", quit, app)
+  app.setAccelsForAction("win.quit", "Escape")
+  window.actionMap.addAction(quitAction)
+
+  let updateImageAction = newSimpleAction("update")
+  discard updateImageAction.connect("activate", forceUpdate, image)
+  app.setAccelsForAction("win.update", "U")
+  window.actionMap.addAction(updateImageAction)
+
+  window.connect("destroy", cleanUp, app)
+
+  window.showAll
+
+  # Setting the inital image
+  # Fix 1 second timeout to make sure all other initialization has finished
+  updateTimeout = int(timeoutAdd(1000, timedUpdate, image))
+
+  ## open communication channel from the control server
+  chan.open()
+
+  ## Start the server for handling incoming commands
+  let serverArgs = newServerArgs(args.verbose)
+  createThread(serverWorker, runServer, serverArgs)
+  discard idleAdd(checkServerChannel, image)
+
+when isMainModule:
+  let app = newApplication("org.luxick.randopix")
+  connect(app, "activate", appActivate)
+  discard run(app)

src/randopix.nim.cfg

@@ -0,0 +1,3 @@
+threads:on
+d:ssl
+gc:arc

src/server.nim

@@ -0,0 +1,60 @@
+import net, json, strutils
+import common
+
+type
+  ServerArgs* = object of RootObj
+    verbose: bool
+
+var
+  chan*: Channel[CommandMessage]
+  verbose: bool
+
+proc newServerArgs*(verbose: bool): ServerArgs =
+  ServerArgs(verbose: verbose)
+
+proc log(things: varargs[string, `$`]) =
+  if verbose:
+    echo things.join()
+
+proc closeServer*() =
+  ## Sends a "Close" command to the server
+  var socket = newSocket()
+  socket.connect("127.0.0.1", Port(defaultPort))
+  let c = newCommand(cClose)
+  socket.send(c.wrap)
+  socket.close()
+
+proc runServer*[ServerArgs](arg: ServerArgs) {.thread, nimcall.} =
+  verbose = arg.verbose
+  var server = net.newSocket()
+  server.bindAddr(Port(defaultPort))
+  server.listen()
+  log "Control server is listening"
+
+  while true:
+    # Process client requests
+    var client = net.newSocket()
+    server.accept(client)
+    log "Client connected"
+    try:
+      var line = client.recvLine()
+      if line == "":
+        log "No data from client"
+        continue
+
+      var jsonData = parseJson(line)
+      let msg = jsonData.to(CommandMessage)
+      case msg.command
+      of cClose:
+        log "Server recieved termination command. Exiting."
+        break
+      else:
+        # Pass command from client to main applicaiton
+        chan.send(msg)
+
+    except OSError:
+      log "Server error: ", getCurrentExceptionMsg()
+    except:
+      log "Invalid command from client: ", getCurrentExceptionMsg()
+      log repr(getCurrentException())
+  server.close()

src/server.nim.cfg

@@ -0,0 +1 @@
+threads:on