forked from ipfs/kubo
-
Notifications
You must be signed in to change notification settings - Fork 0
/
basic_ds.go
156 lines (128 loc) · 3.62 KB
/
basic_ds.go
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
package datastore
import (
"log"
dsq "github.com/ipfs/go-ipfs/Godeps/_workspace/src/github.com/jbenet/go-datastore/query"
)
// Here are some basic datastore implementations.
type keyMap map[Key]interface{}
// MapDatastore uses a standard Go map for internal storage.
type MapDatastore struct {
values keyMap
}
// NewMapDatastore constructs a MapDatastore
func NewMapDatastore() (d *MapDatastore) {
return &MapDatastore{
values: keyMap{},
}
}
// Put implements Datastore.Put
func (d *MapDatastore) Put(key Key, value interface{}) (err error) {
d.values[key] = value
return nil
}
// Get implements Datastore.Get
func (d *MapDatastore) Get(key Key) (value interface{}, err error) {
val, found := d.values[key]
if !found {
return nil, ErrNotFound
}
return val, nil
}
// Has implements Datastore.Has
func (d *MapDatastore) Has(key Key) (exists bool, err error) {
_, found := d.values[key]
return found, nil
}
// Delete implements Datastore.Delete
func (d *MapDatastore) Delete(key Key) (err error) {
if _, found := d.values[key]; !found {
return ErrNotFound
}
delete(d.values, key)
return nil
}
// Query implements Datastore.Query
func (d *MapDatastore) Query(q dsq.Query) (dsq.Results, error) {
re := make([]dsq.Entry, 0, len(d.values))
for k, v := range d.values {
re = append(re, dsq.Entry{Key: k.String(), Value: v})
}
r := dsq.ResultsWithEntries(q, re)
r = dsq.NaiveQueryApply(q, r)
return r, nil
}
// NullDatastore stores nothing, but conforms to the API.
// Useful to test with.
type NullDatastore struct {
}
// NewNullDatastore constructs a null datastoe
func NewNullDatastore() *NullDatastore {
return &NullDatastore{}
}
// Put implements Datastore.Put
func (d *NullDatastore) Put(key Key, value interface{}) (err error) {
return nil
}
// Get implements Datastore.Get
func (d *NullDatastore) Get(key Key) (value interface{}, err error) {
return nil, nil
}
// Has implements Datastore.Has
func (d *NullDatastore) Has(key Key) (exists bool, err error) {
return false, nil
}
// Delete implements Datastore.Delete
func (d *NullDatastore) Delete(key Key) (err error) {
return nil
}
// Query implements Datastore.Query
func (d *NullDatastore) Query(q dsq.Query) (dsq.Results, error) {
return dsq.ResultsWithEntries(q, nil), nil
}
// LogDatastore logs all accesses through the datastore.
type LogDatastore struct {
Name string
child Datastore
}
// Shim is a datastore which has a child.
type Shim interface {
Datastore
Children() []Datastore
}
// NewLogDatastore constructs a log datastore.
func NewLogDatastore(ds Datastore, name string) Shim {
if len(name) < 1 {
name = "LogDatastore"
}
return &LogDatastore{Name: name, child: ds}
}
// Children implements Shim
func (d *LogDatastore) Children() []Datastore {
return []Datastore{d.child}
}
// Put implements Datastore.Put
func (d *LogDatastore) Put(key Key, value interface{}) (err error) {
log.Printf("%s: Put %s\n", d.Name, key)
// log.Printf("%s: Put %s ```%s```", d.Name, key, value)
return d.child.Put(key, value)
}
// Get implements Datastore.Get
func (d *LogDatastore) Get(key Key) (value interface{}, err error) {
log.Printf("%s: Get %s\n", d.Name, key)
return d.child.Get(key)
}
// Has implements Datastore.Has
func (d *LogDatastore) Has(key Key) (exists bool, err error) {
log.Printf("%s: Has %s\n", d.Name, key)
return d.child.Has(key)
}
// Delete implements Datastore.Delete
func (d *LogDatastore) Delete(key Key) (err error) {
log.Printf("%s: Delete %s\n", d.Name, key)
return d.child.Delete(key)
}
// Query implements Datastore.Query
func (d *LogDatastore) Query(q dsq.Query) (dsq.Results, error) {
log.Printf("%s: Query\n", d.Name)
return d.child.Query(q)
}