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
|
/*
* Copyright 2017 Google
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#import "Firestore/Source/Local/FSTLevelDBRemoteDocumentCache.h"
#include <string>
#import "Firestore/Protos/objc/firestore/local/MaybeDocument.pbobjc.h"
#import "Firestore/Source/Core/FSTQuery.h"
#import "Firestore/Source/Local/FSTLevelDB.h"
#import "Firestore/Source/Local/FSTLevelDBKey.h"
#import "Firestore/Source/Local/FSTLocalSerializer.h"
#import "Firestore/Source/Model/FSTDocument.h"
#import "Firestore/Source/Model/FSTDocumentDictionary.h"
#import "Firestore/Source/Model/FSTDocumentSet.h"
#include "Firestore/core/src/firebase/firestore/local/leveldb_transaction.h"
#include "Firestore/core/src/firebase/firestore/model/document_key.h"
#include "Firestore/core/src/firebase/firestore/util/hard_assert.h"
#include "leveldb/db.h"
#include "leveldb/write_batch.h"
NS_ASSUME_NONNULL_BEGIN
using firebase::firestore::local::LevelDbTransaction;
using firebase::firestore::model::DocumentKey;
using leveldb::DB;
using leveldb::Status;
@interface FSTLevelDBRemoteDocumentCache ()
@property(nonatomic, strong, readonly) FSTLocalSerializer *serializer;
@end
@implementation FSTLevelDBRemoteDocumentCache {
FSTLevelDB *_db;
}
- (instancetype)initWithDB:(FSTLevelDB *)db serializer:(FSTLocalSerializer *)serializer {
if (self = [super init]) {
_db = db;
_serializer = serializer;
}
return self;
}
- (void)addEntry:(FSTMaybeDocument *)document {
std::string key = [self remoteDocumentKey:document.key];
_db.currentTransaction->Put(key, [self.serializer encodedMaybeDocument:document]);
}
- (void)removeEntryForKey:(const DocumentKey &)documentKey {
std::string key = [self remoteDocumentKey:documentKey];
_db.currentTransaction->Delete(key);
}
- (nullable FSTMaybeDocument *)entryForKey:(const DocumentKey &)documentKey {
std::string key = [FSTLevelDBRemoteDocumentKey keyWithDocumentKey:documentKey];
std::string value;
Status status = _db.currentTransaction->Get(key, &value);
if (status.IsNotFound()) {
return nil;
} else if (status.ok()) {
return [self decodeMaybeDocument:value withKey:documentKey];
} else {
HARD_FAIL("Fetch document for key (%s) failed with status: %s", documentKey.ToString(),
status.ToString());
}
}
- (FSTDocumentDictionary *)documentsMatchingQuery:(FSTQuery *)query {
FSTDocumentDictionary *results = [FSTDocumentDictionary documentDictionary];
// Documents are ordered by key, so we can use a prefix scan to narrow down
// the documents we need to match the query against.
std::string startKey = [FSTLevelDBRemoteDocumentKey keyPrefixWithResourcePath:query.path];
auto it = _db.currentTransaction->NewIterator();
it->Seek(startKey);
FSTLevelDBRemoteDocumentKey *currentKey = [[FSTLevelDBRemoteDocumentKey alloc] init];
for (; it->Valid() && [currentKey decodeKey:it->key()]; it->Next()) {
FSTMaybeDocument *maybeDoc =
[self decodeMaybeDocument:it->value() withKey:currentKey.documentKey];
if (!query.path.IsPrefixOf(maybeDoc.key.path())) {
break;
} else if ([maybeDoc isKindOfClass:[FSTDocument class]]) {
results = [results dictionaryBySettingObject:(FSTDocument *)maybeDoc forKey:maybeDoc.key];
}
}
return results;
}
- (std::string)remoteDocumentKey:(const DocumentKey &)key {
return [FSTLevelDBRemoteDocumentKey keyWithDocumentKey:key];
}
- (FSTMaybeDocument *)decodeMaybeDocument:(absl::string_view)encoded
withKey:(const DocumentKey &)documentKey {
NSData *data = [[NSData alloc] initWithBytesNoCopy:(void *)encoded.data()
length:encoded.size()
freeWhenDone:NO];
NSError *error;
FSTPBMaybeDocument *proto = [FSTPBMaybeDocument parseFromData:data error:&error];
if (!proto) {
HARD_FAIL("FSTPBMaybeDocument failed to parse: %s", error);
}
FSTMaybeDocument *maybeDocument = [self.serializer decodedMaybeDocument:proto];
HARD_ASSERT([maybeDocument.key isEqualToKey:documentKey],
"Read document has key (%s) instead of expected key (%s).",
maybeDocument.key.ToString(), documentKey.ToString());
return maybeDocument;
}
@end
NS_ASSUME_NONNULL_END
|
