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|
implement Poller;
include "sys.m";
sys: Sys;
include "draw.m";
draw: Draw;
Rect, Point: import draw;
include "tk.m";
tk: Tk;
include "tkclient.m";
tkclient: Tkclient;
include "dialog.m";
dialog: Dialog;
include "arg.m";
Poller: module
{
init: fn(nil: ref Draw->Context, nil: list of string);
};
Maxanswer: con 4; # Tk below isn't parametrised, but could be
contents := array[] of {
"frame .f",
"frame .f.n",
"label .f.l -anchor nw -text {Number of answers: }",
"radiobutton .f.n.a2 -text {2} -variable nanswer -value 2",
"radiobutton .f.n.a3 -text {3} -variable nanswer -value 3",
"radiobutton .f.n.a4 -text {4} -variable nanswer -value 4",
"pack .f.n.a2 .f.n.a3 .f.n.a4 -side left",
"frame .f.b",
"button .f.b.start -text {Start} -command {send cmd start}",
"button .f.b.stop -text {Stop} -state disabled -command {send cmd stop}",
"pack .f.b.start .f.b.stop -side left",
"canvas .f.c -height 230 -width 200",
"pack .f.l -side top -fill x",
"pack .f.n -side top -fill x",
"pack .f.b -side top -fill x -expand 1",
"pack .f.c -side top -pady 2",
"pack .f -side top -fill both -expand 1",
};
dbcontents := array[] of {
"text .f.t -state disabled -wrap word -height 4h -yscrollcommand {.f.sb set}", # message log
"scrollbar .f.sb -orient vertical -command {.f.t yview}",
"pack .f.sb -side left -fill y",
"pack .f.t -side left -fill both",
};
Bar: adt {
frame: ref Tk->Toplevel;
canvas: string;
border: string;
inside: string;
label: string;
r: Rect;
v: real;
draw: fn(nil: self ref Bar);
};
usage()
{
sys->fprint(sys->fildes(2), "usage: poller [-d] [servicedir] pollname\n");
raise "fail:usage";
}
init(ctxt: ref Draw->Context, args: list of string)
{
sys = load Sys Sys->PATH;
draw = load Draw Draw->PATH;
tk = load Tk Tk->PATH;
tkclient = load Tkclient Tkclient->PATH;
dialog = load Dialog Dialog->PATH;
arg := load Arg Arg->PATH;
if(arg == nil){
sys->fprint(sys->fildes(2), "poller: can't load %s: %r\n", Arg->PATH);
raise "fail:load";
}
arg->init(args);
debug := 0;
while((ch := arg->opt()) != 0)
case ch {
'd' =>
debug = 1;
* =>
usage();
}
args = arg->argv();
arg = nil;
if(len args < 1)
usage();
sys->pctl(Sys->NEWPGRP, nil);
servicedir := "/n/remote/services";
if(len args == 2)
(servicedir, args) = (hd args, tl args);
pollname := hd args;
(cfd, dir, emsg) := opensvc(servicedir, "mpx", pollname);
if(cfd == nil){
sys->fprint(sys->fildes(2), "poller: can't access polling station %s: %s\n", pollname, emsg);
raise "fail:error";
}
fd := sys->open(dir+"/root", Sys->ORDWR);
if(fd == nil){
sys->fprint(sys->fildes(2), "poller: can't open %s/root: %r\n", dir);
raise "fail:open";
}
tkclient->init();
dialog->init();
(frame, wmctl) := tkclient->toplevel(ctxt, nil, sys->sprint("Poller: %s", pollname), Tkclient->Appl);
cmd := chan of string;
tk->namechan(frame, cmd, "cmd");
tkcmds(frame, contents);
if(debug)
tkcmds(frame, dbcontents);
tkcmd(frame, "pack propagate . 0");
fittoscreen(frame);
tk->cmd(frame, "update");
tkclient->onscreen(frame, nil);
tkclient->startinput(frame, "kbd"::"ptr"::nil);
bars := mkbars(frame, ".f.c", Maxanswer);
count: array of int;
in := chan of string;
spawn reader(fd, in);
first := 1;
qno := 0;
nanswer := 0;
opt := 0;
total := 0;
for(;;)
alt{
s := <-frame.ctxt.kbd =>
tk->keyboard(frame, s);
s := <-frame.ctxt.ptr =>
tk->pointer(frame, *s);
s := <-frame.ctxt.ctl or
s = <-frame.wreq or
s = <-wmctl =>
tkclient->wmctl(frame, s);
c := <-cmd =>
if(fd == nil){
dialog->prompt(ctxt, frame.image, "error -fg red", "Error", "Lost connection to polling station", 0, "Dismiss"::nil);
break;
}
case c {
"start" =>
s := tkcmd(frame, "variable nanswer");
if(s == nil || s[0] == '!'){
dialog->prompt(ctxt, frame.image, "error -fg red", "Error", "Please select number of answers", 0, "Ok"::nil);
break;
}
nanswer = int s;
count = array[Maxanswer] of {* => 0};
total = 0;
qno++;
#opt = (int tkcmd(frame, "variable none") << 1) | int tkcmd(frame, "variable all");
tkcmd(frame, ".f.b.start configure -state disabled");
tkcmd(frame, ".f.b.stop configure -state normal");
if(sys->fprint(fd, "poll %d %d %d", qno, nanswer, opt) <= 0)
sys->fprint(sys->fildes(2), "poller: write error: %r\n");
"stop" =>
tkcmd(frame, ".f.b.stop configure -state disabled");
tkcmd(frame, "update");
if(sys->fprint(fd, "stop %d", qno) <= 0)
sys->fprint(sys->fildes(2), "poller: write error: %r\n");
# stop ...
tkcmd(frame, ".f.b.start configure -state normal");
}
tk->cmd(frame, "update");
s := <-in =>
if(s != nil){
if(debug){
t := s;
if(!first)
t = "\n"+t;
first = 0;
tkcmd(frame, ".f.t insert end '" + t);
tkcmd(frame, ".f.t see end");
tkcmd(frame, "update");
}
r := getresult(s, qno);
if(r < 0)
break;
if(r >= 0 && r < len count){
count[r]++;
total++;
for(i:=0; i < len count; i++){
bars[i].v = real count[i]/real total;
bars[i].draw();
}
tk->cmd(frame, "update");
}
#sys->print("%d %d\n", qno, r);
}else
fd = nil;
}
}
mkbars(t: ref Tk->Toplevel, canvas: string, nbars: int): array of ref Bar
{
x := 0;
a := array[nbars] of ref Bar;
for(i := 0; i < nbars; i++){
b := ref Bar(t, canvas, nil, nil, nil, Rect((x,2),(x+20,202)), 0.0);
b.border = tkcmd(t, sys->sprint("%s create rectangle %d %d %d %d",
canvas, b.r.min.x,b.r.min.y,b.r.max.x,b.r.max.y));
r := b.r.inset(1);
b.inside = tkcmd(t, sys->sprint("%s create rectangle %d %d %d %d -fill red",
canvas, r.max.x, r.max.y,r.max.x,r.max.y));
b.label = tkcmd(t, sys->sprint("%s create text %d %d -justify center -anchor n -text '0%%",
canvas, (r.min.x+r.max.x)/2, r.max.y+4));
a[i] = b;
x += 50;
}
tk->cmd(t, "update");
return a;
}
Bar.draw(b: self ref Bar)
{
r := b.r.inset(2);
y := r.max.y - int (b.v * real r.dy());
tkcmd(b.frame, sys->sprint("%s coords %s %d %d %d %d",
b.canvas, b.inside, r.min.x, y, r.max.x, r.max.y));
tkcmd(b.frame, sys->sprint("%s itemconfigure %s -text '%.0f%%",
b.canvas, b.label, b.v*100.0));
}
getresult(msg: string, qno: int): int
{
(nf, flds) := sys->tokenize(msg, " ");
if(nf < 5 || hd flds == "error:")
return -1; # not of interest
op := hd tl tl flds;
flds = tl tl tl flds;
if(op != "m")
return -1; # not a message from leaf
if(len flds < 3)
return -1; # bad format
flds = tl flds; # ignore user name
if(int hd flds != qno)
return -1; # not current question
result := hd tl flds;
if(result[0] >= 'A' && result[0] <= 'D')
return result[0]-'A';
return -1;
}
reader(fd: ref Sys->FD, c: chan of string)
{
buf := array[Sys->ATOMICIO] of byte;
while((n := sys->read(fd, buf, len buf)) > 0)
c <-= string buf[0:n];
if(n < 0)
c <-= sys->sprint("error: %r");
c <-= nil;
}
opensvc(dir: string, svc: string, name: string): (ref Sys->FD, string, string)
{
ctlfd := sys->open(dir+"/ctl", Sys->ORDWR);
if(ctlfd == nil)
return (nil, nil, sys->sprint("can't open %s/ctl: %r", dir));
if(sys->fprint(ctlfd, "%s %s", svc, name) <= 0)
return (nil, nil, sys->sprint("can't access %s service %s: %r", svc, name));
buf := array [32] of byte;
sys->seek(ctlfd, big 0, Sys->SEEKSTART);
n := sys->read(ctlfd, buf, len buf);
if (n <= 0)
return (nil, nil, sys->sprint("%s/ctl: protocol error: %r", dir));
return (ctlfd, dir+"/"+string buf[0:n], nil);
}
tkcmds(t: ref Tk->Toplevel, cmds: array of string)
{
for (i := 0; i < len cmds; i++)
tkcmd(t, cmds[i]);
}
tkcmd(t: ref Tk->Toplevel, cmd: string): string
{
s := tk->cmd(t, cmd);
if (s != nil && s[0] == '!')
sys->fprint(sys->fildes(2), "poller: tk error: %s [%s]\n", s, cmd);
return s;
}
fittoscreen(win: ref Tk->Toplevel)
{
if (win.image == nil || win.image.screen == nil)
return;
r := win.image.screen.image.r;
scrsize := Point((r.max.x - r.min.x), (r.max.y - r.min.y));
bd := int tkcmd(win, ". cget -bd");
winsize := Point(int tkcmd(win, ". cget -actwidth") + bd * 2, int tkcmd(win, ". cget -actheight") + bd * 2);
if (winsize.x > scrsize.x)
tkcmd(win, ". configure -width " + string (scrsize.x - bd * 2));
if (winsize.y > scrsize.y)
tkcmd(win, ". configure -height " + string (scrsize.y - bd * 2));
actr: Rect;
actr.min = Point(int tkcmd(win, ". cget -actx"), int tkcmd(win, ". cget -acty"));
actr.max = actr.min.add((int tkcmd(win, ". cget -actwidth") + bd*2,
int tkcmd(win, ". cget -actheight") + bd*2));
(dx, dy) := (actr.dx(), actr.dy());
if (actr.max.x > r.max.x)
(actr.min.x, actr.max.x) = (r.min.x - dx, r.max.x - dx);
if (actr.max.y > r.max.y)
(actr.min.y, actr.max.y) = (r.min.y - dy, r.max.y - dy);
if (actr.min.x < r.min.x)
(actr.min.x, actr.max.x) = (r.min.x, r.min.x + dx);
if (actr.min.y < r.min.y)
(actr.min.y, actr.max.y) = (r.min.y, r.min.y + dy);
tkcmd(win, ". configure -x " + string actr.min.x + " -y " + string actr.min.y);
}
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