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diff --git a/docs/REDIS b/docs/REDIS deleted file mode 100644 index 54358d16f..000000000 --- a/docs/REDIS +++ /dev/null @@ -1,160 +0,0 @@ -Starting in Anope 1.9.9, Anope has Redis database support (http://redis.io/). -This document explains the data structure used by Anope, and explains how -keyspace notification works. - -This is not a tutorial on how to use Redis, see http://redis.io/documentation -for that. - -Table of Contents ------------------ -1) Data structure -2) Keyspace notifications -3) Examples of modifying, deleting, and creating objects - -1) Data structure - - There are 4 key namespaces in Anope, they are: - - id - The keys in id are used to atomically create object ids for new - objects. For example, if I were to create a new BotInfo I would first: - - redis 127.0.0.1:6379> INCR id:BotInfo - - To get the object ID of the new object. - - ids - The keys in ids contain a set of all object ids of the given type. - For example: - - redis 127.0.0.1:6379> SMEMBERS ids:BotInfo - - Returns "1", "2", "3", "4", "5", "6", "7", "8" because I have 8 bots that - have IDs 1, 2, 3, 4, 5, 6, 7, and 8, respectively. - - hash - The keys in hash are the actual objects, stored as hashes. For - example, if I had just looked up all BotInfo ids and wanted to iterate - over all of them, I woulld start by: - - redis 127.0.0.1:6379> HGETALL hash:BotInfo:1 - - Which gets all keys and values from the hash of type BotInfo with id 1. - This may return: - - "nick" -> "BotServ" - "user" -> "services" - "host" -> "services.anope.org" - "created" -> "1368704765" - - value - The keys in value only exist to aid looking up object IDs. They - are sets of object IDs and are used to map key+value pairs to objects. - For example: - - redis 127.0.0.1:6379> SMEMBERS value:NickAlias:nick:Adam - - Returns a set of object ids of NickAlias objects that have the key - 'nick' set to the value 'Adam' in its hash. Clearly this can only - ever contain at most one object, since it is not possible to have - more than one registered nick with the same name, but other keys - will contain more than one, such as: - - redis 127.0.0.1:6379> SMEMBERS value:NickCore:email:adam@anope.org - - Which would return all accounts with the email "adam@anope.org". - - redis 127.0.0.1:6379> SMEMBERS value:ChanAccess:mask:Adam - - Which would return all access entries set on the account "Adam". - - Behavior similar to SQL's AND, can be achieved using the - SINTER command, which does set intersection on one or more sets. - -2) Keyspace notifications - - Redis 2.7 (unstable) and 2.8 (stable) and newer support keyspace notifications - (http://redis.io/topics/notifications). This allows Redis to notify Anope of - any external changes to objects in the database. Once notified, Anope will - immediately update the object. Otherwise, Anope keeps all objects in memory - and will not regularly read from the databaes once started. - - You can use this to modify objects in Redis and have them immediately reflected - back into Anope. Additionally you can use this feature to run multiple Anope - instances simultaneously from the same database (see also, Redis database - replication). - - To use keyspace notifications you MUST execute - - redis 127.0.0.1:6379> CONFIG SET notify-keyspace-events KA - OK - - or set notify-keyspace-events in redis.conf properly. Anope always executes - CONFIG SET when it first connects. - - If you do not enable keyspace events properly Anope will be UNABLE to see any - object modifications you do. - - The key space ids and value are managed entirely by Anope, you do - not (and should not) modify them. Once you modify the object (hash), Anope will - update them for you to correctly refelect any changes made to the object. - - Finally, always use atomic operations. If you are inserting a new object with - multiple commands, or inserting multiple objects at once, specifically if the - objects depend on each other, you MUST use a transaction. - -3) Examples of modifying, deleting, and creating objects - - These examples will ONLY work if you meet the criteria in section 2. - - If I want to change the email account 'Adam' to 'Adam@anope.org', I would execute the following: - - redis 127.0.0.1:6379> SMEMBERS value:NickCore:display:Adam - - Which returns a value of "1", which is the object id I want to modify. - Now to change the email: - - redis 127.0.0.1:6379> HSET hash:NickCore:1 email Adam@anope.org - - You can now see this in NickServ's INFO command: - -NickServ- Email address: Adam@anope.org - - If I want to drop the account "Adam", I would execute the following: - - redis 127.0.0.1:6379> SMEMBERS value:NickCore:display:Adam - - Which returns a value of "1". I would then check: - - redis 127.0.0.1:6379> SMEMBERS value:NickAlias:nc:Adam - - To see what nicknames depend on this account to exist, as I will - have to remove those too. This returns the values "2", and "3". - - Finally, I can drop the nick using a transaction via: - - redis 127.0.0.1:6379> MULTI - OK - redis 127.0.0.1:6379> DEL hash:NickAlias:2 - QUEUED - redis 127.0.0.1:6379> DEL hash:NickAlias:3 - QUEUED - redis 127.0.0.1:6379> DEL hash:NickCore:1 - QUEUED - redis 127.0.0.1:6379> EXEC - - Or alternatively simply: - - redis 127.0.0.1:6379> DEL hash:NickAlias:2 hash:NickAlias:3 hash:NickCore:1 - - If I wanted to create a BotServ bot, I would execute the following: - - redis 127.0.0.1:6379> INCR id:BotInfo - - Which returns a new object ID for me, in this example it will be "8". - Now I can create the object: - - HMSET hash:BotInfo:8 nick redis user redis host services.anope.org realname "Services for IRC Networks" - - Note if you are using HSET instead of HMSET you will need to use a transaction, as shown in the above example. - If you are watching your services logs you will immediately see: - - USERS: redis!redis@services.anope.org (Services for IRC Networks) connected to the network (services.anope.org) - - And the bot redis will be in BotServ's bot list. - Notice how ids:BotInfo and the value keys are updated automatically. |