1. 1
2. 2
3. 3
4. 4
5. 5
6. 6
7. 7
8. 8
9. 9
10. 10
11. 11
12. 12
13. 13
14. 14
15. 15
16. 16
17. 17
18. 18
19. 19
20. 20
21. 21
22. 22
23. 23
24. 24
25. 25
26. 26
27. 27
28. 28
29. 29
30. 30
31. 31
32. 32
33. 33
34. 34
35. 35
36. 36
37. 37
38. 38
39. 39
40. 40
41. 41
42. 42
43. 43
44. 44
45. 45
46. 46
47. 47
48. 48
49. 49
50. 50
51. 51
52. 52
53. 53
54. 54
55. 55
56. 56
57. 57
58. 58
59. 59

# levelqueue

Level queue is a simple queue golang library base on go-leveldb.

[![Build Status](https://drone.gitea.com/api/badges/lunny/levelqueue/status.svg)](https://drone.gitea.com/lunny/levelqueue)  [![](http://gocover.io/_badge/gitea.com/lunny/levelqueue)](http://gocover.io/gitea.com/lunny/levelqueue)
[![](https://goreportcard.com/badge/gitea.com/lunny/levelqueue)](https://goreportcard.com/report/gitea.com/lunny/levelqueue)

## Installation

```
go get gitea.com/lunny/levelqueue
```

## Usage

```Go
queue, err := levelqueue.Open("./queue")

err = queue.RPush([]byte("test"))

// pop an element from left of the queue
data, err = queue.LPop()

// if handle success, element will be pop, otherwise it will be keep
queue.LHandle(func(dt []byte) error{
    return nil
})
```

You can now create a Set from a leveldb:

```Go
set, err := levelqueue.OpenSet("./set")

added, err:= set.Add([]byte("member1"))

has, err := set.Has([]byte("member1"))

members, err := set.Members()

removed, err := set.Remove([]byte("member1"))
```

And you can create a UniqueQueue from a leveldb:

```Go
queue, err := levelqueue.OpenUnique("./queue")

err := queue.RPush([]byte("member1"))

err = queue.LPush([]byte("member1"))
// Will return ErrAlreadyInQueue

// and so on.
```

## Creating Queues, UniqueQueues and Sets from already open DB

If you have an already open DB you can create these from this using the
`NewQueue`, `NewUniqueQueue` and `NewSet` functions.