redisconf 2016 talk - the redis api: simple, composable, powerful

Copyright 2016 DynomiteDB

The Redis APISimple, Composable, Powerful

Akbar S. Ahmed@DynomiteDB


Simple


RESP (Redis protocol)

GETSETLSET ZUNION

Redis server

Redis API


RESP

GETSETLSET ZUNION

Pluggable backends Pluggable backendsPluggable backends

Redis API


Schema


Schema

SELECT firstnameFROM userwhere id = 7

user:id=7key


Data types

StringListSetSorted SetHash


String

h e l l o

greeting:english

Sequence of bytesX


String

h e l l o

GETSET

SETRANGEGETRANGE

greeting:english

STRLEN

APPEND


String with Integer value

3 5 7 8 4metrics:dau

INCR DECR

INCRBY DECRBY


String with Float value

3 . 1 4 1pie

INCRBYFLOAT


Listweb:signups

Bob Barney Ash

Ordered by insertionX

Duplicates allowedX

Fast head/tail operationsX


List commands

Bob Barney AshLPUSH

LPOP

RPUSH

RPOP

LRANGELTRIM


Setemployees

Bob

Jane

DavidUnorderedXUnique membersX

Set operationsX


SetSADDSREMSPOP

SISMEMBER

Bob

David

JaneSCARD

SuePam

SINTER

SUNION

SDIFF


Sorted set blog:posts:vote

sRESP 5High

availability24

Caching 350Redis API 467

Ordered by scoreXUnique membersX

Set operationsX


Sorted set

RESP 5High

availability24

Caching 350Redis API 467

ZADD

ZCARD

ZRANGEZREVRANGE

ZRANGEBYLEX

ZRANGEBYSCORE

ZCOUNTZLEXCOUNT

ZINCRBY

ZRANKZSCORE

ZINTERSTOREZUNIONSTORE


Hash company:id=7

Key ValueName Apple

Revenue 233BState CACity Cupertino

UnorderedXUnique membersX


Hash

Key ValueName Apple

Revenue 233BState CACity Cupertino

HGET / HMGET

HSET / HMSET

HKEYSHGETALL


Ordered Unique

Best for

String Index No ● Cache (text, JSON, binary)

● CountingList Insertio

nNo ● Fast head/tail operations

● Recent items

Set No Yes ● Existence / membership● Set operations

Sorted set

Score Yes ● Top x items● Set operations

Hash No Yes ● Cache● Database row / document


Simple, Composable, Powerful


Redis APICRM app

Database

Cache

Use case


if (sort === 'az') { // Get the first 10 companies sorted alphabetically cache.zrange(murmurhash.v2('companies:atoz'), 0, 9, handler);} else if (sort === 'revenue') { // Get the reverse range: sorted = high to low revenue cache.zrevrange(murmurhash.v2('companies:rev'), 0, 9, handler);} else if (sort === 'recent') { cache.lrange(murmurhash.v2('companies:recent'), 0, 9, handler);}

View Companies


handler()if (reply) { async.map(reply, getDetails, displayCompanies);} else { if (sort === 'az') { db.zrange(murmurhash.v2('companies:atoz'), 0, 9, handler); } else if (sort === 'revenue') { db.zrevrange(murmurhash.v2('companies:rev'), 0, 9, handler); } else if (sort === 'recent') { db.lrange(murmurhash.v2('companies:recent'), 0, 9, handler); }}


getDetails()cache.hgetall(key.getKeyHash(company), function(err, reply) { if (reply) { reply.slug = slug(reply.name.toLowerCase()); reply.qualified = (reply.qualified === 'true'); } else { db.hgetall(key.getKeyHash(company), ...); } cb(null, reply)});


Generate key// Generate text keyvar keyText = 'company:name=' + slug(company.name);

// Generate hashed keyvar keyHash = murmurhash.v2(keyText);


Save companycache.hmset(keyHash, 'name', company.name, 'phone', company.phone, 'website', company.website, 'revenue', company.revenue, 'step', company.step, 'qualified', company.qualified.toString(), saveToRecentCompanies);

db.hmset(....)


saveToRecentCompanies()cache.lpush( murmurhash.v2('companies:recent'), company.name, saveToAlphabetical);

db.lpush( murmurhash.v2('companies:recent'), company.name, saveToAlphabetical);


saveToAlphabetical()cache.zadd( murmurhash.v2('companies:alphabetical'), 1, company.name, saveToRevenue);

db.zadd( murmurhash.v2('companies:alphabetical'), 1, company.name, saveToRevenue);


saveToRevenue()cache.zadd( murmurhash.v2('companies:revenue'), company.revenue, company.name, renderNextPage);

db.zadd( murmurhash.v2('companies:revenue'), company.revenue, Company.name, renderNextPage);


Company detailscache.hgetall(key.getKeyHash(req.params.slug), showCompany);


Edit companyUpdating a company reuses 100% of the save company database and cache code.


Thank you

https://github.com/DynomiteDB/redisconf-2016-nodejshttps://github.com/DynomiteDB/redisconf-2016-go (soon)

https://github.com/DynomiteDB/crm-nodejs (soon)Java coming soon. Follow on Twitter for updates.

@DynomiteDB

https://github.com/DynomiteDB/redisconf-2016-nodejs

https://github.com/DynomiteDB/redisconf-2016-go

https://github.com/DynomiteDB/crm-nodejs

redisconf 2016 talk - the redis api: simple, composable, powerful

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