aboutsummaryrefslogtreecommitdiffstats
path: root/cache/repo_cache_identity.go
blob: 75453cb8803b4ad1de638db189d3867731c40334 (plain) (blame)
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
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
package cache

import (
	"bytes"
	"encoding/gob"
	"fmt"

	"github.com/MichaelMure/git-bug/entity"
	"github.com/MichaelMure/git-bug/identity"
)

const identityCacheFile = "identity-cache"

// identityUpdated is a callback to trigger when the excerpt of an identity
// changed, that is each time an identity is updated
func (c *RepoCache) identityUpdated(id entity.Id) error {
	c.muIdentity.Lock()

	i, ok := c.identities[id]
	if !ok {
		c.muIdentity.Unlock()
		panic("missing identity in the cache")
	}

	c.identitiesExcerpts[id] = NewIdentityExcerpt(i.Identity)
	c.muIdentity.Unlock()

	// we only need to write the identity cache
	return c.writeIdentityCache()
}

// load will try to read from the disk the identity cache file
func (c *RepoCache) loadIdentityCache() error {
	c.muIdentity.Lock()
	defer c.muIdentity.Unlock()

	f, err := c.repo.LocalStorage().Open(identityCacheFile)
	if err != nil {
		return err
	}

	decoder := gob.NewDecoder(f)

	aux := struct {
		Version  uint
		Excerpts map[entity.Id]*IdentityExcerpt
	}{}

	err = decoder.Decode(&aux)
	if err != nil {
		return err
	}

	if aux.Version != formatVersion {
		return fmt.Errorf("unknown cache format version %v", aux.Version)
	}

	c.identitiesExcerpts = aux.Excerpts
	return nil
}

// write will serialize on disk the identity cache file
func (c *RepoCache) writeIdentityCache() error {
	c.muIdentity.RLock()
	defer c.muIdentity.RUnlock()

	var data bytes.Buffer

	aux := struct {
		Version  uint
		Excerpts map[entity.Id]*IdentityExcerpt
	}{
		Version:  formatVersion,
		Excerpts: c.identitiesExcerpts,
	}

	encoder := gob.NewEncoder(&data)

	err := encoder.Encode(aux)
	if err != nil {
		return err
	}

	f, err := c.repo.LocalStorage().Create(identityCacheFile)
	if err != nil {
		return err
	}

	_, err = f.Write(data.Bytes())
	if err != nil {
		return err
	}

	return f.Close()
}

// ResolveIdentityExcerpt retrieve a IdentityExcerpt matching the exact given id
func (c *RepoCache) ResolveIdentityExcerpt(id entity.Id) (*IdentityExcerpt, error) {
	c.muIdentity.RLock()
	defer c.muIdentity.RUnlock()

	e, ok := c.identitiesExcerpts[id]
	if !ok {
		return nil, identity.ErrIdentityNotExist
	}

	return e, nil
}

// ResolveIdentity retrieve an identity matching the exact given id
func (c *RepoCache) ResolveIdentity(id entity.Id) (*IdentityCache, error) {
	c.muIdentity.RLock()
	cached, ok := c.identities[id]
	c.muIdentity.RUnlock()
	if ok {
		return cached, nil
	}

	i, err := identity.ReadLocal(c.repo, id)
	if err != nil {
		return nil, err
	}

	cached = NewIdentityCache(c, i)

	c.muIdentity.Lock()
	c.identities[id] = cached
	c.muIdentity.Unlock()

	return cached, nil
}

// ResolveIdentityExcerptPrefix retrieve a IdentityExcerpt matching an id prefix.
// It fails if multiple identities match.
func (c *RepoCache) ResolveIdentityExcerptPrefix(prefix string) (*IdentityExcerpt, error) {
	return c.ResolveIdentityExcerptMatcher(func(excerpt *IdentityExcerpt) bool {
		return excerpt.Id.HasPrefix(prefix)
	})
}

// ResolveIdentityPrefix retrieve an Identity matching an id prefix.
// It fails if multiple identities match.
func (c *RepoCache) ResolveIdentityPrefix(prefix string) (*IdentityCache, error) {
	return c.ResolveIdentityMatcher(func(excerpt *IdentityExcerpt) bool {
		return excerpt.Id.HasPrefix(prefix)
	})
}

// ResolveIdentityImmutableMetadata retrieve an Identity that has the exact given metadata on
// one of it's version. If multiple version have the same key, the first defined take precedence.
func (c *RepoCache) ResolveIdentityImmutableMetadata(key string, value string) (*IdentityCache, error) {
	return c.ResolveIdentityMatcher(func(excerpt *IdentityExcerpt) bool {
		return excerpt.ImmutableMetadata[key] == value
	})
}

func (c *RepoCache) ResolveIdentityExcerptMatcher(f func(*IdentityExcerpt) bool) (*IdentityExcerpt, error) {
	id, err := c.resolveIdentityMatcher(f)
	if err != nil {
		return nil, err
	}
	return c.ResolveIdentityExcerpt(id)
}

func (c *RepoCache) ResolveIdentityMatcher(f func(*IdentityExcerpt) bool) (*IdentityCache, error) {
	id, err := c.resolveIdentityMatcher(f)
	if err != nil {
		return nil, err
	}
	return c.ResolveIdentity(id)
}

func (c *RepoCache) resolveIdentityMatcher(f func(*IdentityExcerpt) bool) (entity.Id, error) {
	c.muIdentity.RLock()
	defer c.muIdentity.RUnlock()

	// preallocate but empty
	matching := make([]entity.Id, 0, 5)

	for _, excerpt := range c.identitiesExcerpts {
		if f(excerpt) {
			matching = append(matching, excerpt.Id)
		}
	}

	if len(matching) > 1 {
		return entity.UnsetId, identity.NewErrMultipleMatch(matching)
	}

	if len(matching) == 0 {
		return entity.UnsetId, identity.ErrIdentityNotExist
	}

	return matching[0], nil
}

// AllIdentityIds return all known identity ids
func (c *RepoCache) AllIdentityIds() []entity.Id {
	c.muIdentity.RLock()
	defer c.muIdentity.RUnlock()

	result := make([]entity.Id, len(c.identitiesExcerpts))

	i := 0
	for _, excerpt := range c.identitiesExcerpts {
		result[i] = excerpt.Id
		i++
	}

	return result
}

func (c *RepoCache) NewIdentityFromGitUser() (*IdentityCache, error) {
	return c.NewIdentityFromGitUserRaw(nil)
}

func (c *RepoCache) NewIdentityFromGitUserRaw(metadata map[string]string) (*IdentityCache, error) {
	i, err := identity.NewFromGitUser(c.repo)
	if err != nil {
		return nil, err
	}
	return c.finishIdentity(i, metadata)
}

// NewIdentity create a new identity
// The new identity is written in the repository (commit)
func (c *RepoCache) NewIdentity(name string, email string) (*IdentityCache, error) {
	return c.NewIdentityRaw(name, email, "", "", nil, nil)
}

// NewIdentityFull create a new identity
// The new identity is written in the repository (commit)
func (c *RepoCache) NewIdentityFull(name string, email string, login string, avatarUrl string, keys []*identity.Key) (*IdentityCache, error) {
	return c.NewIdentityRaw(name, email, login, avatarUrl, keys, nil)
}

func (c *RepoCache) NewIdentityRaw(name string, email string, login string, avatarUrl string, keys []*identity.Key, metadata map[string]string) (*IdentityCache, error) {
	i, err := identity.NewIdentityFull(c.repo, name, email, login, avatarUrl, keys)
	if err != nil {
		return nil, err
	}
	return c.finishIdentity(i, metadata)
}

func (c *RepoCache) finishIdentity(i *identity.Identity, metadata map[string]string) (*IdentityCache, error) {
	for key, value := range metadata {
		i.SetMetadata(key, value)
	}

	err := i.Commit(c.repo)
	if err != nil {
		return nil, err
	}

	c.muIdentity.Lock()
	if _, has := c.identities[i.Id()]; has {
		return nil, fmt.Errorf("identity %s already exist in the cache", i.Id())
	}

	cached := NewIdentityCache(c, i)
	c.identities[i.Id()] = cached
	c.muIdentity.Unlock()

	// force the write of the excerpt
	err = c.identityUpdated(i.Id())
	if err != nil {
		return nil, err
	}

	return cached, nil
}