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.

Changelog

v2.8.0

Proper v2 in go.mod.

v2.7.0

SWAPDB

older

See https://github.com/alicebob/miniredis/releases for the full changelog

Commands

Implemented commands:

• Connection (complete)
  • AUTH -- see RequireAuth()
  • ECHO
  • PING
  • SELECT
  • SWAPDB
  • 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
  • TIME -- returns time.Now() or value set by SetTime()
• 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
• Pub/Sub (complete)
  • PSUBSCRIBE
  • PUBLISH
  • PUBSUB
  • PUNSUBSCRIBE
  • SUBSCRIBE
  • UNSUBSCRIBE
• 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
  • ZPOPMIN
  • ZPOPMAX
  • ZRANGE
  • ZRANGEBYLEX
  • ZRANGEBYSCORE
  • ZRANK
  • ZREM
  • ZREMRANGEBYLEX
  • ZREMRANGEBYRANK
  • ZREMRANGEBYSCORE
  • ZREVRANGE
  • ZREVRANGEBYLEX
  • ZREVRANGEBYSCORE
  • ZREVRANK
  • ZSCORE
  • ZUNIONSTORE
  • ZSCAN
• Scripting
  • EVAL
  • EVALSHA
  • SCRIPT LOAD
  • SCRIPT EXISTS
  • SCRIPT FLUSH

TTLs, key expiration, and time

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.

m.FastForward(d) can be used to decrement all TTLs. All TTLs which become <= 0 will be removed.

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.

SetTime() also sets the value returned by TIME, which defaults to time.Now(). It is not updated by FastForward, only by SetTime.

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/gomodule/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
• Scripting
  • SCRIPT DEBUG
  • SCRIPT KILL
• Server
  • BGSAVE
  • BGWRITEAOF
  • CLIENT *
  • COMMAND *
  • CONFIG *
  • DEBUG *
  • INFO
  • LASTSAVE
  • MONITOR
  • ROLE
  • SAVE
  • SHUTDOWN
  • SLAVEOF
  • SLOWLOG
  • SYNC

&c.

Tests are run against Redis 5.0.3. The ./integration subdir compares miniredis against a real redis instance.