295 lines
8.9 KiB
Tcl
295 lines
8.9 KiB
Tcl
# Tcl client library - used by the Redis test
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# Copyright (C) 2009-2014 Salvatore Sanfilippo
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# Released under the BSD license like Redis itself
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#
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# Example usage:
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#
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# set r [redis 127.0.0.1 6379]
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# $r lpush mylist foo
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# $r lpush mylist bar
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# $r lrange mylist 0 -1
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# $r close
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#
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# Non blocking usage example:
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#
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# proc handlePong {r type reply} {
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# puts "PONG $type '$reply'"
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# if {$reply ne "PONG"} {
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# $r ping [list handlePong]
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# }
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# }
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#
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# set r [redis]
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# $r blocking 0
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# $r get fo [list handlePong]
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#
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# vwait forever
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package require Tcl 8.5
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package provide redis 0.1
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namespace eval redis {}
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set ::redis::id 0
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array set ::redis::fd {}
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array set ::redis::addr {}
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array set ::redis::blocking {}
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array set ::redis::deferred {}
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array set ::redis::reconnect {}
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array set ::redis::callback {}
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array set ::redis::state {} ;# State in non-blocking reply reading
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array set ::redis::statestack {} ;# Stack of states, for nested mbulks
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proc redis {{server 127.0.0.1} {port 6379} {defer 0}} {
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set fd [socket $server $port]
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fconfigure $fd -translation binary
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set id [incr ::redis::id]
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set ::redis::fd($id) $fd
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set ::redis::addr($id) [list $server $port]
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set ::redis::blocking($id) 1
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set ::redis::deferred($id) $defer
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set ::redis::reconnect($id) 0
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::redis::redis_reset_state $id
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interp alias {} ::redis::redisHandle$id {} ::redis::__dispatch__ $id
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}
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# This is a wrapper to the actual dispatching procedure that handles
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# reconnection if needed.
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proc ::redis::__dispatch__ {id method args} {
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set errorcode [catch {::redis::__dispatch__raw__ $id $method $args} retval]
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if {$errorcode && $::redis::reconnect($id) && $::redis::fd($id) eq {}} {
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# Try again if the connection was lost.
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# FIXME: we don't re-select the previously selected DB, nor we check
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# if we are inside a transaction that needs to be re-issued from
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# scratch.
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set errorcode [catch {::redis::__dispatch__raw__ $id $method $args} retval]
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}
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return -code $errorcode $retval
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}
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proc ::redis::__dispatch__raw__ {id method argv} {
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set fd $::redis::fd($id)
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# Reconnect the link if needed.
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if {$fd eq {}} {
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lassign $::redis::addr($id) host port
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set ::redis::fd($id) [socket $host $port]
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fconfigure $::redis::fd($id) -translation binary
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set fd $::redis::fd($id)
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}
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set blocking $::redis::blocking($id)
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set deferred $::redis::deferred($id)
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if {$blocking == 0} {
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if {[llength $argv] == 0} {
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error "Please provide a callback in non-blocking mode"
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}
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set callback [lindex $argv end]
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set argv [lrange $argv 0 end-1]
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}
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if {[info command ::redis::__method__$method] eq {}} {
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set cmd "*[expr {[llength $argv]+1}]\r\n"
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append cmd "$[string length $method]\r\n$method\r\n"
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foreach a $argv {
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append cmd "$[string length $a]\r\n$a\r\n"
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}
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::redis::redis_write $fd $cmd
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if {[catch {flush $fd}]} {
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set ::redis::fd($id) {}
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return -code error "I/O error reading reply"
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}
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if {!$deferred} {
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if {$blocking} {
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::redis::redis_read_reply $id $fd
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} else {
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# Every well formed reply read will pop an element from this
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# list and use it as a callback. So pipelining is supported
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# in non blocking mode.
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lappend ::redis::callback($id) $callback
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fileevent $fd readable [list ::redis::redis_readable $fd $id]
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}
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}
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} else {
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uplevel 1 [list ::redis::__method__$method $id $fd] $argv
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}
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}
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proc ::redis::__method__blocking {id fd val} {
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set ::redis::blocking($id) $val
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fconfigure $fd -blocking $val
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}
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proc ::redis::__method__reconnect {id fd val} {
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set ::redis::reconnect($id) $val
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}
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proc ::redis::__method__read {id fd} {
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::redis::redis_read_reply $id $fd
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}
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proc ::redis::__method__write {id fd buf} {
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::redis::redis_write $fd $buf
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}
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proc ::redis::__method__flush {id fd} {
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flush $fd
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}
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proc ::redis::__method__close {id fd} {
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catch {close $fd}
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catch {unset ::redis::fd($id)}
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catch {unset ::redis::addr($id)}
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catch {unset ::redis::blocking($id)}
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catch {unset ::redis::deferred($id)}
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catch {unset ::redis::reconnect($id)}
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catch {unset ::redis::state($id)}
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catch {unset ::redis::statestack($id)}
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catch {unset ::redis::callback($id)}
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catch {interp alias {} ::redis::redisHandle$id {}}
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}
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proc ::redis::__method__channel {id fd} {
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return $fd
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}
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proc ::redis::__method__deferred {id fd val} {
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set ::redis::deferred($id) $val
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}
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proc ::redis::redis_write {fd buf} {
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puts -nonewline $fd $buf
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}
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proc ::redis::redis_writenl {fd buf} {
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redis_write $fd $buf
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redis_write $fd "\r\n"
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flush $fd
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}
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proc ::redis::redis_readnl {fd len} {
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set buf [read $fd $len]
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read $fd 2 ; # discard CR LF
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return $buf
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}
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proc ::redis::redis_bulk_read {fd} {
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set count [redis_read_line $fd]
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if {$count == -1} return {}
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set buf [redis_readnl $fd $count]
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return $buf
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}
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proc ::redis::redis_multi_bulk_read {id fd} {
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set count [redis_read_line $fd]
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if {$count == -1} return {}
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set l {}
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set err {}
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for {set i 0} {$i < $count} {incr i} {
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if {[catch {
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lappend l [redis_read_reply $id $fd]
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} e] && $err eq {}} {
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set err $e
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}
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}
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if {$err ne {}} {return -code error $err}
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return $l
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}
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proc ::redis::redis_read_line fd {
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string trim [gets $fd]
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}
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proc ::redis::redis_read_reply {id fd} {
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set type [read $fd 1]
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switch -exact -- $type {
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: -
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+ {redis_read_line $fd}
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- {return -code error [redis_read_line $fd]}
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$ {redis_bulk_read $fd}
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* {redis_multi_bulk_read $id $fd}
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default {
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if {$type eq {}} {
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set ::redis::fd($id) {}
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return -code error "I/O error reading reply"
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}
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return -code error "Bad protocol, '$type' as reply type byte"
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}
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}
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}
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proc ::redis::redis_reset_state id {
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set ::redis::state($id) [dict create buf {} mbulk -1 bulk -1 reply {}]
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set ::redis::statestack($id) {}
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}
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proc ::redis::redis_call_callback {id type reply} {
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set cb [lindex $::redis::callback($id) 0]
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set ::redis::callback($id) [lrange $::redis::callback($id) 1 end]
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uplevel #0 $cb [list ::redis::redisHandle$id $type $reply]
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::redis::redis_reset_state $id
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}
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# Read a reply in non-blocking mode.
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proc ::redis::redis_readable {fd id} {
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if {[eof $fd]} {
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redis_call_callback $id eof {}
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::redis::__method__close $id $fd
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return
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}
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if {[dict get $::redis::state($id) bulk] == -1} {
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set line [gets $fd]
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if {$line eq {}} return ;# No complete line available, return
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switch -exact -- [string index $line 0] {
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: -
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+ {redis_call_callback $id reply [string range $line 1 end-1]}
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- {redis_call_callback $id err [string range $line 1 end-1]}
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$ {
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dict set ::redis::state($id) bulk \
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[expr [string range $line 1 end-1]+2]
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if {[dict get $::redis::state($id) bulk] == 1} {
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# We got a $-1, hack the state to play well with this.
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dict set ::redis::state($id) bulk 2
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dict set ::redis::state($id) buf "\r\n"
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::redis::redis_readable $fd $id
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}
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}
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* {
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dict set ::redis::state($id) mbulk [string range $line 1 end-1]
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# Handle *-1
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if {[dict get $::redis::state($id) mbulk] == -1} {
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redis_call_callback $id reply {}
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}
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}
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default {
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redis_call_callback $id err \
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"Bad protocol, $type as reply type byte"
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}
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}
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} else {
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set totlen [dict get $::redis::state($id) bulk]
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set buflen [string length [dict get $::redis::state($id) buf]]
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set toread [expr {$totlen-$buflen}]
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set data [read $fd $toread]
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set nread [string length $data]
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dict append ::redis::state($id) buf $data
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# Check if we read a complete bulk reply
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if {[string length [dict get $::redis::state($id) buf]] ==
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[dict get $::redis::state($id) bulk]} {
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if {[dict get $::redis::state($id) mbulk] == -1} {
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redis_call_callback $id reply \
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[string range [dict get $::redis::state($id) buf] 0 end-2]
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} else {
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dict with ::redis::state($id) {
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lappend reply [string range $buf 0 end-2]
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incr mbulk -1
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set bulk -1
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}
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if {[dict get $::redis::state($id) mbulk] == 0} {
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redis_call_callback $id reply \
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[dict get $::redis::state($id) reply]
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}
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}
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}
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}
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}
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