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|
#!/usr/bin/tclsh
namespace eval www {
package require TclOO
oo::class create server {
constructor {{ports 0} {acts {}}} {
my variable actions
set actions $acts
foreach port $ports {
my bind $port
}
}
destructor {
my variable sockets
foreach sock $sockets {
close $sock
}
}
method ports {} {
my variable sockets
foreach sock $sockets {
lappend ports [lindex [chan configure $sock -sockname] 2]
}
return $ports
}
# actions of existing clients (where request is ongoing) aren't modified, only actions for new clients
method action {uri handler} {
my variable actions
dict set actions $uri $handler
}
method bind {{port 0}} {
my variable sockets
lappend sockets [socket -server "[self] accept" $port]
}
method accept {chan addr port} {
my variable actions
if [dict exists $actions accept] {
[{*}[dict get $actions accept] $chan $addr $port]
}
::www::client new $chan $actions
}
}
oo::class create client {
constructor {sock {acts {}}} {
my variable chan stage actions
set stage headers
set chan $sock
set actions $acts
chan event $chan readable "[self] readable"
chan configure $chan -blocking 0
}
destructor {
my variable chan
close $chan
}
method readable {} {
my variable to_parse chan stage headers arguments uri path body
switch $stage {
headers {
if {[catch {append to_parse [gets $chan]}] != 0} {
my destroy
}
append to_parse "\n"
if {[string first "\n\n" $to_parse] != -1} {
set raw_headers [split $to_parse "\n"]
set i 0
foreach hdr [lreplace $raw_headers 0 0] {
lappend hdrs [string trim [lindex [split $hdr :] 0]]
set value [lreplace [split $hdr :] 0 0]
lappend hdrs [string trim [join $value :]]
}
set components {}
foreach component [split [lindex $raw_headers 0] " "] {
if {$component != {}} {
lappend components $component
}
}
set uri [lindex $components 1]
dict for {key value} $hdrs {
dict append headers [string tolower $key] $value
}
set path [lindex [split $uri "?"] 0]
set arguments [split [lindex [split $uri "?"] 1] "&=;"]
set body {}
if [dict exists $headers content-length] {
set stage body
set to_parse {}
chan configure $chan -translation {binary auto} -encoding binary -eofchar {{} {}}
} else {
set stage read
my request_complete
}
}
}
body {
if {[catch {append to_parse [read $chan]}] != 0} {
my destroy
}
if {[string length $to_parse] == [dict get $headers content-length]} {
lappend arguments {*}[split $to_parse "%=;"]
set body $to_parse
set stage read
my request_complete
}
}
read {
}
}
}
method request_complete {} {
my variable actions headers arguments uri body path
dict for {key value} $actions {
if [string match -nocase $key $uri] {
return [{*}$value [self] $path $arguments $headers $body $uri]
}
}
return [my send {404 not found-ni najdeno} {content-type text/plain} {404 not found-ni najdeno
}]
}
method send {code headers body} {
my variable to_write chan data
# cr is auto translated to crlf for network sockets in tcl
set to_write "HTTP/1.0 $code
Connection: close
"
dict for {key value} $headers {
append to_write "$key: $value
"
}
append to_write "
"
set data $body
chan event $chan writable "[self] writable"
}
method writable {} {
my variable chan to_write data
if {[catch {puts -nonewline $chan $to_write}] != 0} {
my destroy
}
chan configure $chan -translation {binary binary} -encoding binary
if {[catch {puts -nonewline $chan $data}] != 0} {
}
my destroy
}
}
if [string match *www.tcl* $argv0] {
proc action {client path arguments headers body uri} {
$client send {200 ok} {content-type text/html} "
<h1>hello world from <code>www.tcl</code><h1>
<p>request path: <pre>$path</pre></p>
<p>request uri: <pre>$uri</pre></p>
<p>request arguments: <pre>$arguments</pre></p>
<p>request headers: <pre>$headers</pre></p>
<p>request body: <pre>$body</pre></p>
<form method=post>
<input name=input placeholder='try sending something'><input type=submit>
</form>
"
}
server create s 0 "/* [namespace which action]"
puts "http://127.0.0.1:[s ports]/helloworld"
vwait forever
}
}
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