/usr/share/tcltk/tcllib1.19/udpcluster/udpcluster.tcl is in tcllib 1.19-dfsg-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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# ### ### ### ######### ######### #########
## Name Service - Cluster
# ### ### ### ######### ######### #########
## Requirements
package require Tcl 8.5
package require comm ; # Generic message transport
package require interp ; # Interpreter helpers.
package require logger ; # Tracing internal activity
package require uuid
package require cron 2.0
package require nettool 0.5.2
package require udp
package require dicttool
namespace eval ::comm {}
::namespace eval ::cluster {}
###
# This package implements an ad/hoc zero configuration
# like network of comm (and other) network connections
###
###
# topic: 5cffdc91e554c923ebe43df13fac77d5
###
proc ::cluster::broadcast {args} {
if {$::cluster::config(debug)} {
puts [list $::cluster::local_pid SEND $args]
}
variable discovery_port
listen
while {[catch {
foreach net [::nettool::broadcast_list] {
if {$::cluster::config(debug)} {
puts [list BROADCAST -> $net $args]
}
set s [udp_open]
udp_conf $s $net $discovery_port
chan puts -nonewline $s [list [pid] {*}$args]
chan flush $s
chan close $s
}
} error]} {
set ::cluster::broadcast_sock {}
if {$::cluster::config(debug)} {
puts "Broadcast ERR: $error - Reopening Socket"
::cron::sleep 2000
} else {
# Double the delay
::cron::sleep 250
}
}
}
###
# topic: 963e24601d0dc61580c9727a74cdba67
###
proc ::cluster::cname rawname {
# Convert rawname to a canonical name
if {[string first @ $rawname] < 0 } {
return $rawname
}
lassign [split $rawname @] service host
if {$host eq {}} {
set host *
}
if {$host in {local localhost}} {
set host [::cluster::self]
}
return $service@$host
}
proc ::cluster::Directory args {
# Fullfill locally
switch [lindex $args 0] {
alloc_port {
return [Get_free_port [lindex $args 1]]
}
port_busy {
return [::nettool::port_busy [lindex $args 1]]
}
pid {
return [pid]
}
}
error "UNKNOWN COMMAND [lindex $args 0]"
}
proc ::cluster::directory args {
::cluster::listen
variable directory_sock
if {$directory_sock ne {}} {
return [Directory {*}$args]
}
# We are not acting as the directory, query who is
variable directory_port
set sock [socket localhost $directory_port]
chan configure $sock -translation crlf -buffering line -blocking 1
chan puts $sock $args
chan flush $sock
update
set reply {}
while {[chan gets $sock line]>0} {
append reply \n $line
if {[::info complete $reply]} break
}
catch {chan close $sock}
lassign $reply result errdat
return $result {*}$errdat
}
###
# topic: 3f5f9e197cc9666dd7953d97fef34019
###
proc ::cluster::ipaddr macid {
# Convert rawname to a canonical name
if {$macid eq [::cluster::self]} {
return 127.0.0.1
}
foreach {servname dat} [search [cname *@$macid]] {
if {[dict exists $dat ipaddr]} {
return [dict get $dat ipaddr]
}
}
###
# Do a lookup
###
error "Could not locate $macid"
}
###
# topic: e57db306f0e931d7febb5ad1f9cb2247
###
proc ::cluster::listen {} {
variable broadcast_sock
if {$broadcast_sock != {}} {
return $broadcast_sock
}
variable discovery_port
# Open a local discovery port to catch non-IP traffic
variable discovery_group
set broadcast_sock [udp_open $discovery_port reuse]
fconfigure $broadcast_sock -buffering none -blocking 0 \
-broadcast 1 \
-mcastadd $discovery_group \
-remote [list $discovery_group $discovery_port]
chan event $broadcast_sock readable [list [namespace current]::UDPPacket $broadcast_sock]
::cron::every cluster_heartbeat 30 ::cluster::heartbeat
variable directory_sock
variable directory_pid
if {$directory_sock eq {} && $directory_pid eq {}} {
variable directory_port
# Nobody is acting as the directory. Have this process step on
if {![catch {socket -server ::cluster::TCPAccept $directory_port} newsock]} {
set directory_sock $newsock
set directory_pid [pid]
} else {
set directory_sock {}
set directory_pid {}
}
}
return $broadcast_sock
}
proc ::cluster::sleep args {
::cron::sleep {*}$args
}
proc ::cluster::TCPAccept {sock host port} {
chan configure $sock -translation {crlf crlf} -buffering line -blocking 1
set packet [chan gets $sock]
if {![string is ascii $packet]} return
if {![::info complete $packet]} return
if {[catch {Directory {*}$packet} reply errdat]} {
chan puts $sock [list $reply $errdat]
} else {
chan puts $sock [list $reply {}]
}
chan flush $sock
chan close $sock
}
###
# topic: 2a33c825920162b0791e2cdae62e6164
###
proc ::cluster::UDPPacket sock {
variable ptpdata
set pid [pid]
set packet [string trim [read $sock]]
set peer [fconfigure $sock -peer]
if {![string is ascii $packet]} return
if {![::info complete $packet]} return
set sender [lindex $packet 0]
if {$::cluster::config(debug)} {
puts [list $::cluster::local_pid RECV $peer $packet]
}
if { $sender eq [pid] } {
# Ignore messages from myself
return
}
set ipaddr [lindex $peer 0]
set messagetype [string toupper [lindex $packet 1]]
# These two message types are not associated with a service
switch -- $messagetype {
DISCOVERY {
variable config
::cluster::heartbeat
return
}
?WHOIS {
set wmacid [lindex $messageinfo 0]
if { $wmacid eq [::cluster::self] } {
broadcast +WHOIS [::cluster::self]
}
return
}
}
set now [clock seconds]
set serviceurl [lindex $packet 2]
set serviceinfo [lindex $packet 3]
set ::cluster::ping_recv($serviceurl) $now
UDPPortInfo $serviceurl $messagetype $serviceinfo
if {[dict exists $serviceinfo pid] && [dict get $serviceinfo pid] eq [pid] } {
# Ignore attempts to overwrite locally managed services from the network
return
}
# Always update the IP of the service info
dict set ptpdata($serviceurl) ipaddr $ipaddr
dict set ptpdata($serviceurl) updated $now
dict set serviceinfo ipaddr [lindex $peer 0]
dict set serviceinfo updated $now
set messageinfo [lrange $packet 4 end]
switch -- $messagetype {
-SERVICE {
if {![::info exists ptpdata($serviceurl)]} {
set result $serviceinfo
} else {
set result [dict merge $ptpdata($serviceurl) $serviceinfo]
}
dict set result closed 1
if {[dict exists $result pid] && [dict get $result pid] eq [pid] } {
# Ignore attempts to overwrite locally managed services from the network
return
}
set ptpdata($serviceurl) $result
Service_Remove $serviceurl $result
}
PONG -
~SERVICE {
set ::cluster::recv_message 1
if {[::info exists ptpdata($serviceurl)]} {
set ptpinfo $ptpdata($serviceurl)
} else {
set ptpinfo {}
}
set delta {}
foreach {field value} $serviceinfo {
if {![dict exists $ptpinfo $field] || [dict get $ptpinfo $field] ne $value} {
dict set ptpdata($serviceurl) $field $value
dict set delta $field $value
}
}
dict set ptpdata($serviceurl) closed 0
Service_Modified $serviceurl $serviceinfo $delta
}
+SERVICE {
set ::cluster::recv_message 1
# Code to register the presence of a service
variable ptpdata
set ptpdata($serviceurl) $serviceinfo
dict set ptpdata($serviceurl) closed 0
Service_Add $serviceurl $serviceinfo
}
LOG {
Service_Log $serviceurl $serviceinfo
}
PING {
foreach {url info} [search_local $serviceurl] {
broadcast PONG $url $info
}
}
}
}
proc ::cluster::UDPPortInfo {serviceurl msgtype newinfo} {
variable ptpdata
# We only care about port changes on the local machine
if {[dict exists $newinfo macid]} {
set macid [dict get $newinfo macid]
if {$macid ne [::cluster::self]} {
return
}
} elseif {[::info exists ptpdata($serviceurl)] && [dict exists $ptpdata($serviceurl) macid]} {
set macid [dict get $ptpdata($serviceurl) macid]
if {$macid ne [::cluster::self]} {
return
}
} else {
return
}
set newport {}
set oldport {}
if {[dict exists $newinfo port]} {
set newport [dict get $newinfo port]
}
if {[::info exists ptpdata($serviceurl)] && [dict exists $ptpdata($serviceurl) port]} {
set oldport [dict get $ptpdata($serviceurl) port]
}
switch -- $msgtype {
-SERVICE {
if {$oldport ne {}} {
::nettool::release_port $oldport
}
if {$newport ne {}} {
::nettool::release_port $newport
}
}
default {
if {$oldport ne {}} {
::nettool::release_port $oldport
}
if {$newport ne {}} {
::nettool::claim_port $newport
}
}
}
}
proc ::cluster::ping {rawname {timeout -1}} {
set rcpt [cname $rawname]
variable ptpdata
set starttime [clock seconds]
set ::cluster::ping_recv($rcpt) 0
broadcast PING $rcpt
update
if {$timeout <= 0} {
set timeout $::cluster::config(ping_timeout)
}
while 1 {
if {$::cluster::ping_recv($rcpt)} break
if {([clock seconds] - $starttime) > $timeout} {
error "Could not locate $rcpt on the network"
}
broadcast PING $rcpt
::cron::sleep $::cluster::config(ping_sleep)
}
if {[::info exists ptpdata($rcpt)]} {
return [dict getnull $ptpdata($rcpt) ipaddr]
}
}
proc ::cluster::publish {url infodict} {
variable local_data
dict set infodict macid [self]
dict set infodict pid [pid]
set local_data($url) [dict merge $infodict {ipaddr 127.0.0.1}]
broadcast +SERVICE $url $infodict
}
proc ::cluster::heartbeat {} {
variable ptpdata
variable config
_Winnow
###
# Broadcast the status of our local services
###
variable local_data
foreach {url info} [array get local_data] {
broadcast ~SERVICE $url $info
}
###
# Trigger any cluster events that haven't fired off
###
foreach {eventid info} [array get ::cluster::events] {
if {$info eq "-1"} {
unset ::cluster::events($eventid)
} else {
lassign $info seconds ms
if {$seconds < $now} {
set ::cluster::events($eventid) -1
}
}
}
}
proc ::cluster::info url {
variable local_data
return [array get local_data $url]
}
proc ::cluster::unpublish {url infodict} {
variable local_data
foreach {field value} $infodict {
dict set local_data($url) $field $value
}
set info [lindex [array get local_data $url] 1]
broadcast -SERVICE $url $info
dict set local_data($url) closed 1
}
proc ::cluster::configure {url infodict {send 1}} {
variable local_data
if {![::info exists local_data($url)]} return
dict set local_data($url) closed 0
foreach {field value} $infodict {
dict set local_data($url) $field $value
}
if {$send} {
broadcast ~SERVICE $url $local_data($url)
update
}
}
proc ::cluster::Get_free_port {{port 50000}} {
if {$port in {{} 0 -1}} {
set port 50000
}
set conflict 1
while {$conflict} {
set conflict 0
set port [::nettool::find_port $port]
foreach {url info} [search *@[macid]] {
if {[dict exists $info port] && [dict get $info port] eq $port} {
incr port
set conflict 1
break
}
}
if {$port >= 65336 } {
error "All ports consumed"
}
}
::nettool::claim_port $port
return $port
}
proc ::cluster::get_free_port {{startport 50000}} {
return [directory alloc_port $startport]
}
proc ::cluster::log args {
broadcast LOG {*}$args
}
###
# topic: 2c04e58c7f93798f9a5ed31a7f5779ab
###
proc ::cluster::resolve {rawname} {
variable ptpdata
set self [self]
set rcpt [cname $rawname]
set ipaddr {}
if {[::info exists ptpdata($rcpt)] && [dict exists $ptpdata($rcpt) macid] && [dict get $ptpdata($rcpt) macid] eq $self} {
set ipaddr 127.0.0.1
} elseif {[::info exists ptpdata($rcpt)] && [dict exists $ptpdata($rcpt) ipaddr] && [dict exists $ptpdata($rcpt) updated]} {
# Try Pull the info from cache
set updatetm [dict get $ptpdata($rcpt) updated]
if {([clock seconds] - $updatetm) < 30} {
set ipaddr [dict get $ptpdata($rcpt) ipaddr]
}
}
if {$ipaddr eq {}} {
ping $rcpt
if {![::info exists ptpdata($rcpt)]} {
error "Could not locate $rcpt on the network"
}
if {[dict exists $ptpdata($rcpt) macid] && [dict get $ptpdata($rcpt) macid] eq $self} {
set ipaddr 127.0.0.1
} else {
if {![dict exists $ptpdata($rcpt) ipaddr]} {
error "Could not locate $rcpt on the network"
}
set ipaddr [dict getnull $ptpdata($rcpt) ipaddr]
if {$ipaddr eq {}} {
error "Could not locate $rcpt on the network"
}
}
}
set port [dict getnull $ptpdata($rcpt) port]
if {$port eq {}} {
error "Could not locate $rcpt on the network"
}
return [list $port $ipaddr]
}
###
# topic: 6c7a0a3a8cb2a7ae98ff0dba960c37a7
###
proc ::cluster::pid {} {
variable local_pid
return $local_pid
}
proc ::cluster::macid {} {
variable local_macid
return $local_macid
}
proc ::cluster::self {} {
variable local_macid
return $local_macid
}
###
# topic: f1b71ff12a8ac10373c67ac5d973cd81
###
proc ::cluster::send {service command args} {
set commid [resolve $service]
return [::comm::comm send $commid $command {*}$args]
}
proc ::cluster::throw {service command args} {
if {[catch {resolve $service} commid]} {
return
}
if [catch {::comm::comm send -async $commid $command {*}$args} reply] {
puts $stderr "ERR: SEND $service $reply"
}
}
###
# topic: c8475e832c912e962f238c61580b669e
###
proc ::cluster::search pattern {
_Winnow
set result {}
variable ptpdata
foreach {service dat} [array get ptpdata $pattern] {
foreach {field value} $dat {
dict set result $service $field $value
}
}
variable local_data
foreach {service dat} [array get local_data $pattern] {
foreach {field value} $dat {
dict set result $service $field $value
}
}
return $result
}
proc ::cluster::is_local pattern {
variable local_data
if {[array exists local_data $pattern]} {
return 1
}
if {[array exists local_data [cname $pattern]]} {
return 1
}
return 0
}
proc ::cluster::search_local pattern {
set result {}
variable local_data
foreach {service dat} [array get local_data $pattern] {
foreach {field value} $dat {
dict set result $service $field $value
}
}
return $result
}
proc ::cluster::Service_Add {serviceurl serviceinfo} {
# Code to register the emergencs of a new service
}
proc ::cluster::Service_Remove {serviceurl serviceinfo} {
# Code to register the loss of a service
}
proc ::cluster::Service_Modified {serviceurl serviceinfo {delta {}}} {
# Code to register an update to a service
}
proc ::cluster::Service_Log {service data delta} {
# Code to register an event
}
###
# Clean out closed and expired entries
# Performed immediately before searches
# and heartbeats
###
proc ::cluster::_Winnow {} {
variable ptpdata
variable config
variable local_data
set now [clock seconds]
foreach {item info} [array get ptpdata] {
set remove 0
if {[dict exists $info closed] && [dict get $info closed]} {
set remove 1
}
if {[dict exists $info updated] && ($now - [dict get $info updated])>$config(discovery_ttl)} {
set remove 1
}
if {$remove} {
unset ptpdata($item)
}
}
foreach {item info} [array get local_data] {
set remove 0
if {[dict exists $info closed] && [dict get $info closed]} {
set remove 1
}
if {$remove} {
unset local_data($item)
}
}
}
###
# topic: d3e48e31cc4baf81395179f4097fee1b
###
namespace eval ::cluster {
# Number of seconds to "remember" data
variable config
array set config {
debug 0
discovery_ttl 300
local_registry 0
ping_timeout 120
ping_sleep 250
}
variable eventcount 0
variable cache {}
variable broadcast_sock {}
variable directory_sock {}
variable cache_maxage 500
variable discovery_port 38573
variable directory_port 38574
variable directory_pid {}
# Currently an unassigned group in the
# Local Network Control Block (224.0.0/24)
# See: RFC3692 and http://www.iana.org
variable discovery_group 224.0.0.200
variable local_port {}
variable local_macid [lindex [lsort [::nettool::mac_list]] 0]
variable local_pid [::uuid::uuid generate]
}
package provide udpcluster 0.3.3
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