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prot-redis.reb
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REBOL [
Title: "Redis protocol"
File: %prot-redis.reb
Date: 27-04-2023
Created: 30-3-2013
Version: 0.3.3
Author: "Boleslav Březovský"
; Checksum: #{FB5370E73C55EF3C16FB73342E6F7ACFF98EFE97}
To-Do: [
{Sharding:
* need to setup nodes - must define with some function (SET-REDIS-NODES
or something like that)
SET-REDIS-NODES [localhost] ; one node on default port
SET-REDIS-NODES [localhost:7000] ; one node on selected port
SET-REDIS-NODES [localhost:7000 localhost:7001] ; two nodes on selected ports
SET-REDIS-NODES [localhost 7000 .. 7009] ; ten nodes from first to last port
SET-REDIS-NODES [192.168.1.100 192.168.1.110] ; two nodes on default ports
SET-REDIS-NODES [192.168.1.100:7000 192.168.1.110:8000] ; two nodes on selected ports
SET-REDIS-NODES [192.168.1.100 7000 .. 7009 192.168.1.200 7000 .. 7009 ] ; twenty nodes on two ranges
etc ...
SET-REDIS-NODES/APPEND - add new node to existing pool
SET-REDIS-NODES/REMOVE - remove node from existing pool
* when there's more than one Redis node, the protocol will shard keys -
split them to different nodes. Basic sharding is done this way:
redis-node: checksum/hash to binary! key length? redis-nodes
this function can be replaced with custom one.
}
]
Notes: [
{
Dialect description:
GET-WORD! get value of word >> x: 1 [:x] == [1]
GET-PATH! get value of path >> a: object [b: 1] [:a/b] == [2]
PAREN! evaluate code >> [(x + a/b)] == [3]
BLOCK! convert to redis key >> [['x x]] == ["x:1"]
}
]
Bugs: [
{
>> user-key: first [vske/user/1]
== vske/user/1
>> send-redis rp [HGET :user-key 'name]
** Access error: protocol error: "ERR wrong number of arguments for 'hget' command"
}
]
Type: 'module
Name: 'prot-redis
Exports: [send-redis write-key read-key load-resp]
Options: [isolate]
]
comment {File redis.r3 created by PROM on 30-Mar-2013/8:55:56+1:00}
debug: none
;debug: :print
flat-body-of: funct [
"Change all set-words to words"
object [object! map!]
][
parse body: body-of object [
any [
change [set key set-word! (key: to word! key)] key
| skip
]
]
body
]
block-string: funct [
"Convert all binary! values in block! to string! (modifies)"
data [block!]
][
parse data [
any [
change [set value binary! (value: to string! value)] value
| skip
]
]
data
]
get-key: funct [
"Return selected key or NONE"
redis-port [port!]
][
any [
all [
redis-port/state
get in redis-port/state 'key
]
all [
redis-port/spec/path
load next redis-port/spec/path
]
]
]
make-bulk: func [
data [ any-type! ] "Data to bulkize"
/local out
] [
out: make binary! 64
; data: to binary! form data ; TODO: does it support all datatypes?
data: switch/default type?/word data [
binary! [ data ]
][ to binary! form data ]
repend out [
"$" to string! length? data crlf
data crlf
]
]
make-bulk-request: func [
args [ block! ] "Arguments for the bulk request"
/local out
] [
out: make binary! 64 * 32
repend out rejoin [ "*" to string! length? args crlf ]
append out collect [
foreach arg args [keep make-bulk arg]
]
]
send-redis: func [
port
data
/binary "Do not convert binary! to string!"
/local
] [
local: write port data
apply :load-resp [ local binary ]
]
load-resp: func [
data
/binary "Do not convert binary! to string!"
/local
message length status error integer bulk multi
msg ret out
] [
out: ret: make block! min 1000 system/schemes/redis/spec/pipeline-limit
message: [
copy msg to crlf (unless binary [msg: to string! msg])
crlf
]
length: [
copy len to crlf (
len: load len
if equal? -1 len [len: none]
)
crlf
]
status: [
#"+" message (
msg: to string! msg
append ret either "OK" = msg [true][msg]
)
]
error: [
#"-" message (
append ret make-redis-error to string! msg
)
]
integer: [
#":" message (
append ret to integer! msg
)
]
no-data: [
"$-1" crlf (
append ret none
)
]
bulk: [
#"$" length
copy msg len skip
crlf (
unless binary [msg: to string! msg]
append ret msg
)
]
multi: [
#"*" length (
bulks: len
append/only ret make block! 10
pos: tail ret
ret: last ret
)
bulks values (ret: pos)
]
values: [status | error | integer | no-data | bulk | multi]
parse data [
some values
]
either single? out [out/1][out]
]
validate-reply: function [
data
] [
~simple: [
[#"+" | #"-" | #":"]
thru crlf
]
~bulk-string: [
#"$"
copy size to crlf
(size: load size)
2 skip
size skip
crlf
]
~empty-string: [
"$-1" crlf
]
~array: [
#"*"
copy size to crlf
(size: load size)
2 skip
size ~content
]
~content: [
~simple | ~empty-string | ~bulk-string | ~array
]
parse data ~content
]
parse-server-info: funct [
"Parse return of INFO command"
data
][
obj: object []
section: word: value: none
body: copy []
chars: charset [#"a" - #"z" #"A" - #"Z" #"_" #"=" #"," #"." #"-" #" "]
integer: charset [#"0" - #"9"]
alphanum: union chars integer
dot: #"."
minus: #"-"
parse to string! data [
some [
"# " copy section to newline skip (body: copy [])
some [
copy word some alphanum #":" (type: string!)
copy value [
some integer dot some integer dot some integer (type: tuple!)
| some integer dot some integer [#"K" | #"M" | #"G"] (type: 'number)
| some integer dot some integer (type: decimal!)
| opt minus some integer (type: integer!)
| some alphanum
] (
if equal? type 'number [
value: switch take/last value [
#"K" [1'000 * to decimal! value]
#"M" [1'000'000 * to decimal! value]
#"G" [1'000'000'000 * to decimal! value]
]
type: integer!
]
value: to :type value
)
newline (repend body [to set-word! word value])
] (
repend obj [to set-word! section make object! body]
)
newline
]
]
obj
]
redis-type?: funct [
"Get Redis datatype of a key"
redis-port [port!]
/key name "Name of key"
][
unless key [name: get-key redis-port ]
if name [
to lit-word! load-resp write redis-port [ TYPE :name ]
]
]
make-redis-error: func [
message
] [
; the 'do arms the error!
do make error! [
type: 'Access
id: 'Protocol
arg1: message
]
]
process-pipeline: func [
"Send pipelined commands to server and get response"
redis-port [port!]
][
tcp-port: redis-port/state/tcp-port
wait [tcp-port redis-port/spec/timeout]
clear tcp-port/extra
tcp-port/spec/redis-data
]
parse-dialect: funct [
"Get value of get-word! and get-path!, evaluate paren! and process KEY blocks"
dialect [block!]
/local body key
][
parse body: copy/deep dialect [
any [
change [set key [get-word! | get-path!] (key: get key)] key
| change [
set key block! (
key: to string! map-each value key [
ajoin reduce [:value #":"]
]
take/last key
)
] key
| change [set key paren! (key: do key)] key
| skip
]
]
body
]
;===AWAKE HANDLER
awake-handler: funct [
event
/local port
][
; print ["Awake-event:" event/type]
port: event/port
switch/default event/type [
lookup [
open port
]
connect [
write port take/part port/extra 32'000
]
wrote [
; DONE in loop to prevent problem described in CC #2160
either empty? port/extra [
read port
] [
write port take/part port/extra 32'000
]
]
read [
local: port/data
append port/spec/redis-data take/part local length? local
either validate-reply port/spec/redis-data [
return true
] [
read port
]
]
close [
return true
]
] [
print ["Unexpected event:" event/type]
close port
return true
]
false ; returned
]
; TODO: support more callbacks, add remove callback, list callbacks
set-callback: func [
"Set callback function"
port [port!]
callback [function!]
][
if open? port [
port/state/tcp-port/spec/callback: :callback
]
]
redis-commands: [
append auth bgrewriteaof bgsave bitcount bitop blpop brpop brpoplpush
client-kill client-list client-getname client-setname config-get
config-set config-resetstat dbsize debug-object debug-segfault decr
decrby del discard dump echo eval evalsha exec exists expire expireat
flushall flushdb get getbit getrange getset hdel hexists hget hgetall
hincrby hincrbyfloat hkeys hlen hmget hmset hset hsetnx hvals incr
incrby incrbyfloat info keys lastsave lindex linsert llen lpop lpush
lpushx lrange lrem lset ltrim mget migrate monitor move mset msetnx
multi object persist pexpire pexpireat ping psetex psubscribe pttl
publish punsubscribe quit randomkey rename renamenx restore rpop
rpoplpush rpush rpushx sadd save scard script-exists script-flush
script-kill script-load sdiff sdiffstore select set setbit setex setnx
setrange shutdown sinter sinterstore sismember slaveof slowlog smembers
smove sort spop srandmember srem strlen subscribe sunion sunionstore
sync time ttl type unsubscribe unwatch watch zadd zcard zcount zincrby
zinterstore zrange zrangebyscore zrank zrem zremrangebyrank
zremrangebyscore zrevrange zrevrangebyscore zrevrank zscore zunionstore
]
write-key: funct [
redis-port [port!]
key
value
][
if all [path? key 2 = length? key] [
member: second key
key: first key
]
type: redis-type?/key redis-port key
cmd: compose reduce/only case [
all [equal? type 'none block? value] [ [RPUSH key (value)] ]
all [
equal? type 'none
any [object? value map? value]
][
[HMSET key (flat-body-of value)]
]
equal? type 'none [ [SET key value] ]
equal? type 'string [ [SET key value] ]
all [equal? type 'list integer? member] [ [LSET key (member - 1) value] ]
all [equal? type 'hash member] [ [HSET key member value] ]
equal? type 'set [ [SADD key value] ]
all [equal? type 'zset member] [ [ZADD key value member] ]
] redis-commands
write redis-port cmd
]
read-key: funct [
"Return raw key's value."
redis-port [port!]
key [any-string! any-word! any-path!]
/convert "Convert data to Rebol type"
][
member: none
if all [path? key 2 = length? key][
member: second key
key: first key
]
type: redis-type?/key redis-port key
post: none ; post process code
cmd: reduce/only case [
all [equal? type 'none none? key] [ [KEYS '*] ]
equal? type 'none [ [] ]
equal? type 'string [ [GET key] ]
all [equal? type 'list integer? member] [ compose [LINDEX key (member - 1)] ]
equal? type 'list [ [LRANGE key 0 -1] ]
all [equal? type 'hash member] [ [HGET key member] ]
equal? type 'hash [ post: 'hash [HGETALL key] ]
all [equal? type 'set member] [ post: 'set [SISMEMBER key member] ]
equal? type 'set [ [SMEMBERS key] ]
all [equal? type 'zset integer? member] [ [ZRANGEBYSCORE key member member] ]
all [equal? type 'zset pair? member] [ [ZRANGEBYSCORE key member/1 member/2] ]
all [equal? type 'zset member] [ post: 'score [ZSCORE key member] ]
equal? type 'zset [ [ZRANGE key 0 -1] ]
] redis-commands
ret: either empty? cmd [none][
write redis-port cmd
]
if all [ret convert] [
ret: load-resp ret
ret: switch/default post [
hash [map ret]
set [to logic! ret]
score [load ret]
][
ret
]
]
ret
]
sys/make-scheme [
name: 'redis
title: "Redis Protocol"
spec: make system/standard/port-spec-net [
port: 6379
timeout: 0:05
pipeline-limit: 1
force-cmd?: false
callback: none
]
actor: [
open?: func [
redis-port [port!]
] [
true? redis-port/state
]
open: func [
redis-port [port!]
/local tcp-port
][
if redis-port/state [return redis-port]
if none? redis-port/spec/host [make-redis-error "Missing host address"]
redis-port/state: context [
tcp-port: none
pipeline-length: 0
; key: if redis-port/spec/path [load next redis-port/spec/path]
key: redis-port/spec/target
index: none
]
redis-port/state/tcp-port: tcp-port: make port! [
scheme: 'tcp
host: redis-port/spec/host
port: redis-port/spec/port
timeout: redis-port/spec/timeout
ref: rejoin [tcp:// host ":" port]
port-state: 'init
redis-data: none
extra: make binary! 10000
callback: :redis-port/spec/callback
]
tcp-port/awake: :awake-handler ;:redis-port/awake ;none
open tcp-port
redis-port
]
close: func [
redis-port [port!]
][
if open? redis-port [
either redis-port/state/pipeline-length > 0 [
read redis-port
][
close redis-port/state/tcp-port
redis-port/state: none
]
]
redis-port
]
read: func [
"Read from port"
redis-port [port!]
/local tcp-port
][
all [
redis-port/spec/path
open redis-port
return read-key redis-port redis-port/state/key
]
tcp-port: redis-port/state/tcp-port
tcp-port/spec/redis-data: make binary! 32'000
wait [tcp-port redis-port/spec/timeout]
clear tcp-port/extra
redis-port/state/pipeline-length: 0
also tcp-port/spec/redis-data close redis-port
]
write: func [
"Write to pipeline"
redis-port [port!]
data [block! string! binary!]
/local tcp-port size
][
unless open? redis-port [open redis-port]
if string? data [
data: reduce ['SET redis-port/state/key data]
]
redis-port/spec/path: none
tcp-port: redis-port/state/tcp-port
if none? tcp-port/extra [
; Init pipeline buffer (100 bytes for each command in automatic or basic mode, 1 000 000 bytes for manual mode
size: either zero? redis-port/spec/pipeline-limit [1'000'000][100 * redis-port/spec/pipeline-limit]
tcp-port/extra: make binary! size
]
append tcp-port/extra make-bulk-request parse-dialect data
redis-port/state/pipeline-length: redis-port/state/pipeline-length + 1
case [
zero? redis-port/spec/pipeline-limit [
redis-port/state/pipeline-length
]
any [
redis-port/spec/force-cmd?
1 = redis-port/spec/pipeline-limit
][
redis-port/spec/force-cmd?: false
read redis-port
]
true [
either redis-port/state/pipeline-length = redis-port/spec/pipeline-limit [
; print mold to string! tcp-port/extra
; print "now reading from server"
read redis-port
] [
redis-port/state/pipeline-length
]
]
]
]
query: func [
;TODO: Add /FIELDS refinement
redis-port [port!]
/local key type response
][
all [
key: redis-port/spec/path
key: load next key
redis-port/spec/path: none
]
case [
none? key [
parse-server-info write redis-port [INFO]
]
true [
type: redis-type?/key redis-port key
reduce/no-set [
name: key
size: (
response: read-key/convert redis-port key
switch/default type [
'hash [length? response]
][response]
; TODO: move this condition to SWITCH block above
either integer? response [ response ][ length? response ]
)
date: (
response: load-resp write redis-port [ TTL :key ]
switch/default response [
-1 [ none ]
][
local: now
local/time: local/time + response
local
]
)
type: (type)
]
]
]
]
delete: func [
redis-port [port!]
/local key member index type cmd
][
all [
key: redis-port/spec/path
key: load next key
none? redis-port/spec/path: none
path? key
set [key member index] to block! key
]
type: redis-type?/key redis-port key
cmd: case [
none? key [ [ FLUSHALL ] ]
all [word? member equal? type 'list][
[ LREM :key :index :member ]
]
all [pair? member equal? type 'list][
[ LTRIM :key (to integer! member/1) (to integer! member/2) ]
]
all [member equal? type 'hash] [ [ HDEL :key :member ] ]
all [member equal? type 'set] [ [ SREM :key :member ] ]
all [member equal? type 'zset] [ [ ZREM :key :member ] ]
true [ [ DEL :key ] ]
]
load-resp write redis-port cmd
]
rename: func [
from
target
/local redis-port
][
redis-port: from
from: last parse from/spec/path "/"
target: last parse target "/"
write redis-port [RENAME :from :target]
]
]
]