RedisTree

RedisTree is a Redis module that implements Polytree as a native data type. It allows creating,locating,pushing and detaching tree from Redis keys. RedisTree has been running in production environment for one year

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Why?

Store organization data in redis, Need ploytree and some helper function

Quick Start

# run redis by docker
docker run -p 6379:6379 -d --name redis-redistree ohbonsai/redistree

# exec redis-cli in redis container
docker exec -it redis-redistree /bin/sh
redis-cli

Commands

• tree.init key tree_value
• tree.get key
• tree.del key
• tree.get_subtree key node_value
• tree.del_subtree key node_value
• tree.set_subtree key node_value tree_value
• tree.get_ancestors key node_value
• tree.get_descendants key node_value
• tree.get_father key node_value
• tree.get_children key node_value

Init Get Del tree from String

    a
  /    \
 b      c
 |
 e

127.0.0.1:6379> tree.init hello "a (b (d) c)"
OK
127.0.0.1:6379> tree.get hello
"a( b( d ) c )"
127.0.0.1:6379> tree.del hello
OK
127.0.0.1:6379> tree.get hello
(nil)
127.0.0.1:6379> tree.init hello "a (("
(error) ERR () is not closed or no root

Fetch Detach

USA government tree

         |----------------------------------USA----------------------------------|
         |                                  |                                    |
    Legislature                      ExecutiveJudiciary                      Judiciary
   /         \                              |                                    |
House      Senate                      WhiteHouse                          SupremeCourt
 |            |                             |                                    |          
Pelosi      Harris                        Biden                               Roberts


127.0.0.1:6379> tree.init usa "USA (Legislature (House (Pelosi) Senate (Harris))ExecutiveJudiciary (WhiteHouse (Biden))Judiciary (SupremeCourt (Roberts)))"
OK

# Get subtree of executive judiciary
127.0.0.1:6379> tree.get_subtree usa ExecutiveJudiciary
"ExecutiveJudiciary( WhiteHouse( Biden ) )"

# Add secretary for Biden
127.0.0.1:6379> tree.set_subtree usa Biden "Blinken"
OK
# now biden has secretary
127.0.0.1:6379> tree.get_subtree usa Biden
"Biden( Blinken )"

# Detach Blinken from Biden
127.0.0.1:6379> tree.del_subtree usa Blinken
"Blinken"
127.0.0.1:6379> tree.get_subtree usa Biden
"Biden"


# Get Harris ancestors 
127.0.0.1:6379> tree.get_ancestors usa Harris
1) "Senate"
2) "Legislature"
3) "USA"

# Get Harris Father node
127.0.0.1:6379> tree.get_father usa Harris
"Senate"

# Get Legislature Children 
127.0.0.1:6379> tree.get_children usa Legislature
1) "House"
2) "Senate"


# Get Legislature Descendants(BFS)
127.0.0.1:6379>  tree.get_descendants usa  Legislature
1) "Legislature"
2) "House"
3) "Senate"
4) "Pelosi"
5) "Harris"

Run

Linux

redis-server --loadmodule yourpath/libretree.so

Mac

redis-server --loadmodule ./target/debug/libretree.dylib

Config

loadmodule /yourpath/libretree.so

Dev

Prerequisites

• Rust: Module written in rust
• Docker: For Cross Compile and Block box Test

Makefile

build                          build retree docker image
builder                        build rust cross-compiler base image, for mac developers
clean                          clean
push                           push to docker hub
test                           do some behavioral tester
tester                         build tester image

TODO

• Postgres ltree gist index
• Postgres ltree query
• Hash Index

Thanks

• RedisJSON
• trees