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#! /usr/bin/env tclsh
# -*- tcl -*-
# @@ Meta Begin
# Application nnslog 1.1
# Meta platform tcl
# Meta summary Nano Name Service Logger
# Meta description This application connects to a name service demon
# Meta description and then continuously logs all changes (new/removed
# Meta description definitions) to the standard output. It will survive
# Meta description the loss of the nameserver and automatically reconnect
# Meta description and continue when it comes back.
# Meta subject {name service} client log
# Meta require {Tcl 8.4}
# Meta require logger
# Meta require nameserv::auto
# Meta author Andreas Kupries
# Meta license BSD
# @@ Meta End
package provide nnslog 1.0
# nns - Nano Name Service Logger
# === = ========================
#
# Use cases
# ---------
#
# (1) Continuously monitor a nameservice for changes.
#
# Command syntax
# --------------
#
# (Ad 1) nnslog ?-host NAME|IP? ?-port PORT? ?-color BOOL?
#
# Monitor a name server. If no port is specified the default
# port 38573 is used to connect to it. If no host is specified
# the default (localhost) is used to connect to it.
# ### ### ### ######### ######### #########
## Requirements
lappend auto_path [file join [file dirname [file dirname \
[file normalize [info script]]]] modules]
package require nameserv::auto 0.3 ;# Need auto-restoring search.
logger::initNamespace ::nnslog
namespace eval ::nnslog { log::setlevel info }
# ### ### ### ######### ######### #########
## Process application command line
proc ::nnslog::ProcessCommandLine {} {
global argv
# Process the options, perform basic validation.
set xcolor 0
if {[llength $argv] < 1} return
while {[llength $argv]} {
set opt [lindex $argv 0]
if {![string match "-*" $opt]} break
switch -exact -- $opt {
-host {
if {[llength $argv] < 2} Usage
set host [lindex $argv 1]
set argv [lrange $argv 2 end]
nameserv::configure -host $host
}
-port {
if {[llength $argv] < 2} Usage
# Todo: Check non-zero unsigned short integer
set port [lindex $argv 1]
set argv [lrange $argv 2 end]
nameserv::configure -port $port
}
-debug {
# Undocumented. Activate the logger services provided
# by various packages.
logger::setlevel debug
set argv [lrange $argv 1 end]
}
default Usage
}
}
# Additional validation. no arguments should be left over.
if {[llength $argv] > 1} Usage
return
}
proc ::nnslog::Usage {{sfx {}}} {
global argv0 ; append argv0 $sfx
puts stderr "$argv0 wrong#args, expected: ?-host NAME|IP? ?-port PORT?"
exit 1
}
proc ::nnslog::ArgError {text} {
global argv0
puts stderr "$argv0: $text"
#puts $::errorInfo
exit 1
}
# ### ### ### ######### ######### #########
## Setup a text|graphical report
proc ::nnslog::My {} {
# Quick access to format the identity of the name service the
# client talks to.
return "[nameserv::auto::cget -host] @[nameserv::auto::cget -port]"
}
proc ::nnslog::Connection {message args} {
# args = tag event details, ignored
log::info $message
return
}
proc ::nnslog::MonitorConnection {} {
uevent::bind nameserv lost-connection [list ::nnslog::Connection "Disconnected name service at [My]"]
uevent::bind nameserv re-connection [list ::nnslog::Connection "Reconnected2 name service at [My]"]
return
}
# ### ### ### ######### ######### #########
## Main
proc ::nnslog::Do.search {} {
MonitorConnection
set contents [nameserv::auto::search -continuous *]
$contents configure -command [list ::nnslog::Do.search.change $contents]
log::info "Logging name service at [My]"
vwait ::forever
# Not reached.
return
}
namespace eval ::nnslog {
variable map
array set map {
add +++
remove ---
}
}
proc ::nnslog::Do.search.change {res type response} {
variable map
if {$type eq "stop"} {
# Cannot happen for nameserv::auto client, we are free to panic.
$res destroy
log::critical {Bad event 'stop' <=> Lost connection, search closed}
return
}
# Print events ...
foreach {name value} $response {
log::info "$map($type) : [list $name = $value]"
}
return
}
# ### ### ### ######### ######### #########
## Invoking the functionality.
::nnslog::ProcessCommandLine
if {[catch {
::nnslog::Do.search
} msg]} {
::nnslog::ArgError $msg
}
# ### ### ### ######### ######### #########
exit
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