forked from keybase/client
-
Notifications
You must be signed in to change notification settings - Fork 0
/
block_put_state_memory.go
181 lines (158 loc) · 4.74 KB
/
block_put_state_memory.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
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
// Copyright 2018 Keybase Inc. All rights reserved.
// Use of this source code is governed by a BSD
// license that can be found in the LICENSE file.
package libkbfs
import (
"context"
"github.com/pkg/errors"
)
type blockState struct {
block Block
readyBlockData ReadyBlockData
syncedCb func() error
oldPtr BlockPointer
}
// blockPutStateMemory is an internal structure to track data in
// memory when putting blocks.
type blockPutStateMemory struct {
blockStates map[BlockPointer]blockState
lastBlock BlockPointer
}
var _ blockPutState = (*blockPutStateMemory)(nil)
func newBlockPutStateMemory(length int) *blockPutStateMemory {
bps := &blockPutStateMemory{}
bps.blockStates = make(map[BlockPointer]blockState, length)
return bps
}
// addNewBlock tracks a new block that will be put. If syncedCb is
// non-nil, it will be called whenever the put for that block is
// complete (whether or not the put resulted in an error). Currently
// it will not be called if the block is never put (due to an earlier
// error).
func (bps *blockPutStateMemory) addNewBlock(
_ context.Context, blockPtr BlockPointer, block Block,
readyBlockData ReadyBlockData, syncedCb func() error) error {
bps.blockStates[blockPtr] = blockState{
block, readyBlockData, syncedCb, zeroPtr}
bps.lastBlock = blockPtr
return nil
}
// saveOldPtr stores the given BlockPointer as the old (pre-readied)
// pointer for the most recent blockState.
func (bps *blockPutStateMemory) saveOldPtr(
_ context.Context, oldPtr BlockPointer) error {
if bps.lastBlock == zeroPtr {
return errors.New("No blocks have been added")
}
bs, ok := bps.blockStates[bps.lastBlock]
if !ok {
return errors.Errorf("Last block %v doesn't exist", bps.lastBlock)
}
bs.oldPtr = oldPtr
bps.blockStates[bps.lastBlock] = bs
return nil
}
func (bps *blockPutStateMemory) oldPtr(
_ context.Context, blockPtr BlockPointer) (BlockPointer, error) {
bs, ok := bps.blockStates[blockPtr]
if ok {
return bs.oldPtr, nil
}
return BlockPointer{}, errors.WithStack(NoSuchBlockError{blockPtr.ID})
}
func (bps *blockPutStateMemory) mergeOtherBps(
_ context.Context, other blockPutState) error {
otherMem, ok := other.(*blockPutStateMemory)
if !ok {
return errors.Errorf("Cannot remove other bps of type %T", other)
}
for ptr, bs := range otherMem.blockStates {
bps.blockStates[ptr] = bs
}
return nil
}
func (bps *blockPutStateMemory) removeOtherBps(
ctx context.Context, other blockPutState) error {
otherMem, ok := other.(*blockPutStateMemory)
if !ok {
return errors.Errorf("Cannot remove other bps of type %T", other)
}
if len(otherMem.blockStates) == 0 {
return nil
}
otherMemPtrs := make(map[BlockPointer]bool, len(otherMem.blockStates))
for ptr := range otherMem.blockStates {
otherMemPtrs[ptr] = true
}
newBps, err := bps.deepCopyWithBlacklist(ctx, otherMemPtrs)
if err != nil {
return err
}
newBpsMem, ok := newBps.(*blockPutStateMemory)
if !ok {
return errors.Errorf(
"Bad deep copy type when removing blocks: %T", newBps)
}
bps.blockStates = newBpsMem.blockStates
return nil
}
func (bps *blockPutStateMemory) ptrs() []BlockPointer {
ret := make([]BlockPointer, len(bps.blockStates))
i := 0
for ptr := range bps.blockStates {
ret[i] = ptr
i++
}
return ret
}
func (bps *blockPutStateMemory) getBlock(
_ context.Context, blockPtr BlockPointer) (Block, error) {
bs, ok := bps.blockStates[blockPtr]
if ok {
return bs.block, nil
}
return nil, errors.WithStack(NoSuchBlockError{blockPtr.ID})
}
func (bps *blockPutStateMemory) getReadyBlockData(
_ context.Context, blockPtr BlockPointer) (ReadyBlockData, error) {
bs, ok := bps.blockStates[blockPtr]
if ok {
return bs.readyBlockData, nil
}
return ReadyBlockData{}, errors.WithStack(NoSuchBlockError{blockPtr.ID})
}
func (bps *blockPutStateMemory) synced(blockPtr BlockPointer) error {
bs, ok := bps.blockStates[blockPtr]
if ok && bs.syncedCb != nil {
return bs.syncedCb()
}
return nil
}
func (bps *blockPutStateMemory) numBlocks() int {
return len(bps.blockStates)
}
func (bps *blockPutStateMemory) deepCopy(
_ context.Context) (blockPutState, error) {
newBps := &blockPutStateMemory{}
newBps.blockStates = make(map[BlockPointer]blockState, len(bps.blockStates))
for ptr, bs := range bps.blockStates {
newBps.blockStates[ptr] = bs
}
return newBps, nil
}
func (bps *blockPutStateMemory) deepCopyWithBlacklist(
_ context.Context, blacklist map[BlockPointer]bool) (blockPutState, error) {
newBps := &blockPutStateMemory{}
newLen := len(bps.blockStates) - len(blacklist)
if newLen < 0 {
newLen = 0
}
newBps.blockStates = make(map[BlockPointer]blockState, newLen)
for ptr, bs := range bps.blockStates {
// Only save the good pointers
if !blacklist[ptr] {
newBps.blockStates[ptr] = bs
}
}
return newBps, nil
}