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web.tcl
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lappend auto_path "./vendor"
package require websocket
proc handleConnect {chan addr port} {
fileevent $chan readable [list handleRead $chan $addr $port]
}
proc htmlEscape {s} { string map {& "&" < "<" > ">" "\"" """} $s }
proc readFile {filename contentTypeVar} {
upvar $contentTypeVar contentType
set fd [open $filename r]
fconfigure $fd -encoding binary -translation binary
set response [read $fd]; close $fd; return $response
}
proc getDotAsPdf {dot contentTypeVar} {
upvar $contentTypeVar contentType
set contentType "application/pdf"
set fd [open |[list dot -Tpdf <<$dot] r]
fconfigure $fd -encoding binary -translation binary
set response [read $fd]; close $fd; return $response
}
proc handlePage {path httpStatusVar contentTypeVar} {
upvar $contentTypeVar contentType
switch -exact -- $path {
"/" {
set l [list]
dict for {id stmt} [Statements::all] {
lappend l [subst {
<li>
<details>
<summary style="[expr {
[lsearch -exact [statement clause $stmt] error] != -1
? "color: red"
: ""}]">
$id: [htmlEscape [statement short $stmt]]</summary>
<pre>[htmlEscape [statement clause $stmt]]</pre>
</details>
</li>
}]
}
subst {
<html>
<head>
<link rel="stylesheet" href="/style.css">
<title>Statements</title>
</head>
<nav>
<a href="/new"><button>New program</button></a>
<a href="/calibrate">Calibration</a>
<a href="/programs">Running programs</a>
<a href="/timings">Timings</a>
<a href="/keyboards">Keyboards</a>
<a href="/statementClauseToId.pdf">statementClauseToId graph</a>
<a href="/statements.pdf">statements graph</a>
</nav>
<h1>Statements</h1>
<ul>[join $l "\n"]</ul>
</html>
}
}
"/timings" {
set runTimes [list]
dict for {lambda runTime} $Evaluator::runTimesMap {
lappend runTimes $lambda $runTime
}
set runTimes [lsort -integer -stride 2 -index 1 $runTimes]
set totalRunTime 0
set l [list]
foreach {lambda runTime} $runTimes {
set runCount [dict get $Evaluator::runCountsMap $lambda]
set totalRunTime [+ $totalRunTime $runTime]
lappend l [subst {
<li>
<pre>[htmlEscape $lambda]</pre> ($runCount runs): $runTime us
</li>
}]
}
subst {
<html>
<head>
<link rel="stylesheet" href="/style.css">
<title>Timings</title>
</head>
<nav>
<a href="/new"><button>New program</button></a>
<a href="/">Statements</a>
<a href="/statementClauseToId.pdf">statementClauseToId graph</a>
<a href="/statements.pdf">statements graph</a>
</nav>
<h1>Timings (total frame run time $totalRunTime us)</h1>
<ul>[join $l "\n"]</ul>
</html>
}
}
"/favicon.ico" {
set contentType "image/x-icon"
readFile "assets/favicon.ico" contentType
}
"/style.css" {
set contentType "text/css"
readFile "assets/style.css" contentType
}
"/statementClauseToId.pdf" {
getDotAsPdf [trie dot [Statements::statementClauseToIdTrie]] contentType
}
"/statements.pdf" {
getDotAsPdf [Statements::dot] contentType
}
"/lib/folk.js" {
set contentType "text/javascript"
readFile "lib/folk.js" contentType
}
"/vendor/gstwebrtc/gstwebrtc-api-2.0.0.min.js" {
set contentType "text/javascript"
readFile "vendor/gstwebrtc/gstwebrtc-api-2.0.0.min.js" contentType
}
default {
upvar $httpStatusVar httpStatus
set httpStatus "HTTP/1.1 404 Not Found"
subst {
<html>
<b>$path</b> Not found.
</html>
}
}
}
}
proc handleRead {chan addr port} {
chan configure $chan -translation crlf
gets $chan line; set firstline $line
# puts "Http: $chan $addr $port: $line"
set headers [list]
while {[gets $chan line] >= 0 && $line ne ""} {
if {[regexp -expanded {^( [^\s:]+ ) \s* : \s* (.+)} $line -> k v]} {
lappend headers $k $v
} else { break }
}
if {[regexp {GET ([^ ]*) HTTP/1.1} $firstline -> path] && $path ne "/ws"} {
set response {}
set matches [Statements::findMatches {/someone/ wishes the web server handles route /route/ with handler /handler/}]
try {
foreach match $matches {
set route [dict get $match route]
set handler [dict get $match handler]
if {[regexp -all $route $path whole_match]} {
fn html {body} {dict create statusAndHeaders "HTTP/1.1 200 OK\nConnection: close\nContent-Type: text/html; charset=utf-8\n\n" body [encoding convertto utf-8 $body]}
fn json {body} {dict create statusAndHeaders "HTTP/1.1 200 OK\nConnection: close\nContent-Type: application/json; charset=utf-8\n\n" body [encoding convertto utf-8 $body]}
set response [apply [list {path ^html ^json} $handler] $path ${^html} ${^json}]
}
}
if {$response eq ""} {
set httpStatus "HTTP/1.1 200 OK"
set contentType "text/html; charset=utf-8"
set body [handlePage $path httpStatus contentType]
if {$contentType eq "text/html; charset=utf-8"} {
set body [encoding convertto utf-8 $body]
}
set response [dict create statusAndHeaders "$httpStatus\nConnection: close\nContent-Type: $contentType\n\n" body $body]
}
if {![dict exists $response statusAndHeaders]} {
error "Response not generated"
}
} on error e {
set contentType "text-html; charset=utf-8"
set body [subst {
<html>
<head>
<title>folk: 500 Internal Server Error</title>
</head>
<body>
<pre>[htmlEscape $e]:
[htmlEscape $::errorInfo]</pre>
</body>
</html>
}]
set response [dict create statusAndHeaders "HTTP/1.1 500 Internal Server Error\nConnection: close\nContent-Type: $contentType\n\n" body [encoding convertto utf-8 $body]]
}
puts -nonewline $chan [dict get $response statusAndHeaders]
if {[dict exists $response body]} {
chan configure $chan -encoding binary -translation binary
puts -nonewline $chan [dict get $response body]
}
close $chan
} elseif {[::websocket::test $::serverSock $chan "/ws" $headers]} {
# puts "WS: $chan $addr $port"
::websocket::upgrade $chan
# from now the handleWS will be called (not anymore handleRead).
} else { puts "Closing: $chan $addr $port $headers"; close $chan }
}
proc handleWS {chan type msg} {
if {$type eq "connect"} {
Assert websocket $chan is connected
} elseif {$type eq "close"} {
Retract websocket $chan is connected
Retract when websocket $chan is connected /...rest/
} elseif {$type eq "text"} {
eval $msg
} elseif {$type eq "ping" || $type eq "pong" || $type eq "disconnect"} {
# puts "Event $type from chan $chan"
} else {
puts "$::thisProcess: Unhandled WS event $type on $chan ($msg)"
}
}
if {[catch {set ::serverSock [socket -server handleConnect 4273]}] == 1} {
error "There's already a Web-capable Folk node running on this machine."
}
::websocket::server $::serverSock
::websocket::live $::serverSock /ws handleWS