Miniredis

Pure Go Redis test server, used in Go unittests.

Sometimes you want to test code which uses Redis, without making it a full-blown integration test. Miniredis implements (parts of) the Redis server, to be used in unittests. It enables a simple, cheap, in-memory, Redis replacement, with a real TCP interface. Think of it as the Redis version of net/http/httptest.

It saves you from using mock code, and since the redis server lives in the test process you can query for values directly, without going through the server stack.

There are no dependencies on external binaries, so you can easily integrate it in automated build processes.

It requires Go 1.9.

Changelog

2.3.1

Lua changes: added cjson library, and redis.sha1hex().

2.3

Added the EVAL, EVALSHA, and SCRIPT commands. Uses a pure Go Lua interpreter. Please open an issue if there are problems with any Lua code.

2.2

Introduced StartAddr().

2.1

Internal cleanups. No changes in functionality.

2.0

2.0.0 improves TTLs to be time.Duration values. .Expire() is removed and replaced by .TTL(), which returns the TTL as a time.Duration. This should be the change needed to upgrade:

1.0:

m.Expire() == 4

2.0:

m.TTL() == 4 * time.Second

Furthermore, .SetTime() is added to help with EXPIREAT commands, and .FastForward() is introduced to test keys expiration.

Commands

Implemented commands:

• Connection (complete)
  • AUTH -- see RequireAuth()
  • ECHO
  • PING
  • SELECT
  • QUIT
• Key
  • DEL
  • EXISTS
  • EXPIRE
  • EXPIREAT
  • KEYS
  • MOVE
  • PERSIST
  • PEXPIRE
  • PEXPIREAT
  • PTTL
  • RENAME
  • RENAMENX
  • RANDOMKEY -- call math.rand.Seed(...) once before using.
  • TTL
  • TYPE
  • SCAN
• Transactions (complete)
  • DISCARD
  • EXEC
  • MULTI
  • UNWATCH
  • WATCH
• Server
  • DBSIZE
  • FLUSHALL
  • FLUSHDB
• String keys (complete)
  • APPEND
  • BITCOUNT
  • BITOP
  • BITPOS
  • DECR
  • DECRBY
  • GET
  • GETBIT
  • GETRANGE
  • GETSET
  • INCR
  • INCRBY
  • INCRBYFLOAT
  • MGET
  • MSET
  • MSETNX
  • PSETEX
  • SET
  • SETBIT
  • SETEX
  • SETNX
  • SETRANGE
  • STRLEN
• Hash keys (complete)
  • HDEL
  • HEXISTS
  • HGET
  • HGETALL
  • HINCRBY
  • HINCRBYFLOAT
  • HKEYS
  • HLEN
  • HMGET
  • HMSET
  • HSET
  • HSETNX
  • HVALS
  • HSCAN
• List keys (complete)
  • BLPOP
  • BRPOP
  • BRPOPLPUSH
  • LINDEX
  • LINSERT
  • LLEN
  • LPOP
  • LPUSH
  • LPUSHX
  • LRANGE
  • LREM
  • LSET
  • LTRIM
  • RPOP
  • RPOPLPUSH
  • RPUSH
  • RPUSHX
• Set keys (complete)
  • SADD
  • SCARD
  • SDIFF
  • SDIFFSTORE
  • SINTER
  • SINTERSTORE
  • SISMEMBER
  • SMEMBERS
  • SMOVE
  • SPOP -- call math.rand.Seed(...) once before using.
  • SRANDMEMBER -- call math.rand.Seed(...) once before using.
  • SREM
  • SUNION
  • SUNIONSTORE
  • SSCAN
• Sorted Set keys (complete)
  • ZADD
  • ZCARD
  • ZCOUNT
  • ZINCRBY
  • ZINTERSTORE
  • ZLEXCOUNT
  • ZRANGE
  • ZRANGEBYLEX
  • ZRANGEBYSCORE
  • ZRANK
  • ZREM
  • ZREMRANGEBYLEX
  • ZREMRANGEBYRANK
  • ZREMRANGEBYSCORE
  • ZREVRANGE
  • ZREVRANGEBYSCORE
  • ZREVRANK
  • ZSCORE
  • ZUNIONSTORE
  • ZSCAN
• Scripting
  • EVAL
  • EVALSHA
  • SCRIPT LOAD
  • SCRIPT EXISTS
  • SCRIPT FLUSH

Since miniredis is intended to be used in unittests TTLs don't decrease automatically. You can use TTL() to get the TTL (as a time.Duration) of a key. It will return 0 when no TTL is set. EXPIREAT and PEXPIREAT values will be converted to a duration. For that you can either set m.SetTime(t) to use that time as the base for the (P)EXPIREAT conversion, or don't call SetTime(), in which case time.Now() will be used. m.FastForward(d) can be used to decrement all TTLs. All TTLs which become <= 0 will be removed.

Example

func TestSomething(t *testing.T) {
	s, err := miniredis.Run()
	if err != nil {
		panic(err)
	}
	defer s.Close()

	// Optionally set some keys your code expects:
	s.Set("foo", "bar")
	s.HSet("some", "other", "key")

	// Run your code and see if it behaves.
	// An example using the redigo library from "github.com/garyburd/redigo/redis":
	c, err := redis.Dial("tcp", s.Addr())
	_, err = c.Do("SET", "foo", "bar")

	// Optionally check values in redis...
	if got, err := s.Get("foo"); err != nil || got != "bar" {
		t.Error("'foo' has the wrong value")
	}
	// ... or use a helper for that:
	s.CheckGet(t, "foo", "bar")

	// TTL and expiration:
	s.Set("foo", "bar")
	s.SetTTL("foo", 10*time.Second)
	s.FastForward(11 * time.Second)
	if s.Exists("foo") {
		t.Fatal("'foo' should not have existed anymore")
	}
}

Not supported

Commands which will probably not be implemented:

• CLUSTER (all)
  • CLUSTER *
  • READONLY
  • READWRITE
• GEO (all) -- unless someone needs these
  • GEOADD
  • GEODIST
  • GEOHASH
  • GEOPOS
  • GEORADIUS
  • GEORADIUSBYMEMBER
• HyperLogLog (all) -- unless someone needs these
  • PFADD
  • PFCOUNT
  • PFMERGE
• Key
  • DUMP
  • MIGRATE
  • OBJECT
  • RESTORE
  • WAIT
• Pub/Sub (all)
  • PSUBSCRIBE
  • PUBLISH
  • PUBSUB
  • PUNSUBSCRIBE
  • SUBSCRIBE
  • UNSUBSCRIBE
• Scripting
  • SCRIPT DEBUG
  • SCRIPT KILL
• Server
  • BGSAVE
  • BGWRITEAOF
  • CLIENT *
  • COMMAND *
  • CONFIG *
  • DEBUG *
  • INFO
  • LASTSAVE
  • MONITOR
  • ROLE
  • SAVE
  • SHUTDOWN
  • SLAVEOF
  • SLOWLOG
  • SYNC
  • TIME

&c.

See https://github.com/alicebob/miniredis_vs_redis for tests comparing miniredis against the real thing. Tests are run against Redis 4.0.6 (Debian).