README
¶
redisx
redisx is a library of Go utilities built on the redigo redis client library.
IntervalSet
Creating very large numbers of Redis keys can hurt performance, but putting them all in a single set requires that they all have the same expiration. Marker is a way to have multiple sets based on time intervals, accessible like a single set. You trade accuracy of expiry times for a significantly reduced key space. For example using 2 intervals of 24 hours:
marker := NewIntervalSet("foos", time.Hour*24, 2)
marker.Add(rc, "A") // time is 2021-12-02T09:00
...
marker.Add(rc, "B") // time is 2021-12-03T10:00
marker.Add(rc, "C") // time is 2021-12-03T11:00
Creates 2 Redis sets like:
foos:2021-12-02 => {"A"} // expires at 2021-12-04T09:00
foos:2021-12-03 => {"B", "C"} // expires at 2021-12-05T11:00
But can be accessed like a single set:
marker.Contains(rc, "A") // true
marker.Contains(rc, "B") // true
marker.Contains(rc, "D") // false
IntervalHash
Same idea as IntervalSet but for hashes, and works well for caching values. For example using 2 intervals of 1 hour:
cache := NewIntervalHash("foos", time.Hour, 2)
cache.Set(rc, "A", "1") // time is 2021-12-02T09:10
...
cache.Set(rc, "B", "2") // time is 2021-12-02T10:15
cache.Set(rc, "C", "3") // time is 2021-12-02T10:20
Creates 2 Redis hashes like:
foos:2021-12-02T09:00 => {"A": "1"} // expires at 2021-12-02T11:10
foos:2021-12-02T10:00 => {"B": "2", "C": "3"} // expires at 2021-12-02T12:20
But can be accessed like a single hash:
cache.Get(rc, "A") // "1"
cache.Get(rc, "B") // "2"
cache.Get(rc, "D") // ""
IntervalSeries
When getting a value from an IntervalHash you're getting the newest value by looking back through the intervals. IntervalSeries however lets you get an accumulated value from each interval.
For example using 3 intervals of 1 hour:
series := NewIntervalSeries("foos", time.Hour, 3)
series.Record(rc, "A", 1) // time is 2021-12-02T09:10
series.Record(rc, "A", 2) // time is 2021-12-02T09:15
...
series.Record(rc, "A", 3) // time is 2021-12-02T10:15
series.Record(rc, "A", 4) // time is 2021-12-02T10:20
...
series.Record(rc, "A", 5) // time is 2021-12-02T11:25
series.Record(rc, "B", 1) // time is 2021-12-02T11:30
Creates 3 Redis hashes like:
foos:2021-12-02T09:00 => {"A": "3"} // expires at 2021-12-02T12:15
foos:2021-12-02T10:00 => {"A": "7"} // expires at 2021-12-02T13:20
foos:2021-12-02T11:00 => {"A": "5", "B": "1"} // expires at 2021-12-02T14:30
But lets us retrieve values across intervals:
series.Get(rc, "A") // [5, 7, 3]
series.Get(rc, "B") // [1, 0, 0]
series.Get(rc, "C") // [0, 0, 0]
CappedZSet
The CappedZSet type is based on a sorted set but enforces a cap on size, by only retaining the highest ranked members.
cset := NewCappedZSet("foos", 3, time.Hour*24)
cset.Add(rc, "A", 1)
cset.Add(rc, "C", 3)
cset.Add(rc, "D", 4)
cset.Add(rc, "B", 2)
cset.Add(rc, "E", 5)
cset.Members(rc) // ["C", "D", "E"] / [3, 4, 5]
Testing Asserts
The assertredis package contains several asserts useful for testing the state of a Redis database.
Documentation
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Index ¶
Constants ¶
This section is empty.
Variables ¶
This section is empty.
Functions ¶
func RandomBase64 ¶
RandomBase64 creates a random string of the length passed in
Types ¶
type CappedZSet ¶
type CappedZSet struct {
// contains filtered or unexported fields
}
CappedZSet is a sorted set but enforces a cap on size
func NewCappedZSet ¶
func NewCappedZSet(key string, cap int, expire time.Duration) *CappedZSet
NewCappedZSet creates a new capped sorted set
type IntervalHash ¶
type IntervalHash struct {
// contains filtered or unexported fields
}
IntervalHash operates like a hash map but with expiring intervals
func NewIntervalHash ¶
func NewIntervalHash(keyBase string, interval time.Duration, size int) *IntervalHash
NewIntervalHash creates a new empty interval hash
func (*IntervalHash) ClearAll ¶
func (h *IntervalHash) ClearAll(rc redis.Conn) error
ClearAll removes all values
type IntervalSeries ¶
type IntervalSeries struct {
// contains filtered or unexported fields
}
IntervalSeries returns all values from interval based hashes.
func NewIntervalSeries ¶
func NewIntervalSeries(keyBase string, interval time.Duration, size int) *IntervalSeries
NewIntervalSeries creates a new empty series
type IntervalSet ¶
type IntervalSet struct {
// contains filtered or unexported fields
}
IntervalSet operates like a set but with expiring intervals
func NewIntervalSet ¶
func NewIntervalSet(keyBase string, interval time.Duration, size int) *IntervalSet
NewIntervalSet creates a new empty interval set
func (*IntervalSet) Add ¶
func (s *IntervalSet) Add(rc redis.Conn, member string) error
Add adds the given value
func (*IntervalSet) ClearAll ¶
func (s *IntervalSet) ClearAll(rc redis.Conn) error
ClearAll removes all values
type Locker ¶
type Locker struct {
// contains filtered or unexported fields
}
func (*Locker) Extend ¶
Extend extends our lock expiration by the passed in number of seconds provided the lock value is correct
Source Files
Directories