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
|
// Copyright 2017 Yahoo Holdings. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.vespa.config.server.application;
import com.yahoo.concurrent.ThreadFactoryFactory;
import com.yahoo.config.provision.ApplicationId;
import com.yahoo.config.provision.TenantName;
import com.yahoo.log.LogLevel;
import com.yahoo.path.Path;
import com.yahoo.text.Utf8;
import com.yahoo.transaction.Transaction;
import com.yahoo.vespa.config.server.ReloadHandler;
import com.yahoo.vespa.config.server.tenant.Tenants;
import com.yahoo.vespa.curator.Curator;
import com.yahoo.vespa.curator.transaction.CuratorOperations;
import com.yahoo.vespa.curator.transaction.CuratorTransaction;
import org.apache.curator.framework.CuratorFramework;
import org.apache.curator.framework.recipes.cache.PathChildrenCacheEvent;
import org.apache.curator.framework.recipes.cache.PathChildrenCacheListener;
import java.util.ArrayList;
import java.util.List;
import java.util.Optional;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.logging.Logger;
/**
* The applications of a tenant, backed by ZooKeeper.
* Each application is stored as a single file, named the same as the application id and containing the id
* of the session storing the content of the application.
*
* @author lulf
* @since 5.1
*/
// TODO: Merge into interface and separate out curator layer instead
public class ZKTenantApplications implements TenantApplications, PathChildrenCacheListener {
private static final Logger log = Logger.getLogger(ZKTenantApplications.class.getName());
private final Curator curator;
private final Path tenantRoot;
private final ExecutorService pathChildrenExecutor = Executors.newFixedThreadPool(1, ThreadFactoryFactory.getThreadFactory(ZKTenantApplications.class.getName()));
private final Curator.DirectoryCache directoryCache;
private final ReloadHandler reloadHandler;
private final TenantName tenant;
private ZKTenantApplications(Curator curator, Path tenantRoot, ReloadHandler reloadHandler, TenantName tenant) {
this.curator = curator;
this.tenantRoot = tenantRoot;
this.reloadHandler = reloadHandler;
this.tenant = tenant;
rewriteApplicationIds();
this.directoryCache = curator.createDirectoryCache(tenantRoot.getAbsolute(), false, false, pathChildrenExecutor);
this.directoryCache.start();
this.directoryCache.addListener(this);
}
public static TenantApplications create(Curator curator, Path root, ReloadHandler reloadHandler, TenantName tenant) {
try {
return new ZKTenantApplications(curator, root, reloadHandler, tenant);
} catch (Exception e) {
throw new RuntimeException(Tenants.logPre(tenant) + "Error creating application repo", e);
}
}
private void rewriteApplicationIds() {
try {
List<String> appNodes = curator.framework().getChildren().forPath(tenantRoot.getAbsolute());
for (String appNode : appNodes) {
Optional<ApplicationId> appId = parseApplication(appNode);
appId.filter(id -> shouldBeRewritten(appNode, id))
.ifPresent(id -> rewriteApplicationId(id, appNode, readSessionId(id, appNode)));
}
} catch (Exception e) {
log.log(LogLevel.WARNING, "Error rewriting application ids on upgrade", e);
}
}
private long readSessionId(ApplicationId appId, String appNode) {
String path = tenantRoot.append(appNode).getAbsolute();
try {
return Long.parseLong(Utf8.toString(curator.framework().getData().forPath(path)));
} catch (Exception e) {
throw new IllegalArgumentException(Tenants.logPre(appId) + "Unable to read the session id from '" + path + "'", e);
}
}
private boolean shouldBeRewritten(String appNode, ApplicationId appId) {
return !appNode.equals(appId.serializedForm());
}
private void rewriteApplicationId(ApplicationId appId, String origNode, long sessionId) {
String newPath = tenantRoot.append(appId.serializedForm()).getAbsolute();
String oldPath = tenantRoot.append(origNode).getAbsolute();
try (CuratorTransaction transaction = new CuratorTransaction(curator)) {
if (curator.framework().checkExists().forPath(newPath) == null) {
transaction.add(CuratorOperations.create(newPath, Utf8.toAsciiBytes(sessionId)));
}
transaction.add(CuratorOperations.delete(oldPath));
transaction.commit();
} catch (Exception e) {
log.log(LogLevel.WARNING, "Error rewriting application id from " + origNode + " to " + appId.serializedForm());
}
}
@Override
public List<ApplicationId> listApplications() {
try {
List<String> appNodes = curator.framework().getChildren().forPath(tenantRoot.getAbsolute());
List<ApplicationId> applicationIds = new ArrayList<>();
for (String appNode : appNodes) {
parseApplication(appNode).ifPresent(applicationIds::add);
}
return applicationIds;
} catch (Exception e) {
throw new RuntimeException(Tenants.logPre(tenant)+"Unable to list applications", e);
}
}
private Optional<ApplicationId> parseApplication(String appNode) {
try {
return Optional.of(ApplicationId.fromSerializedForm(appNode));
} catch (IllegalArgumentException e) {
log.log(LogLevel.INFO, Tenants.logPre(tenant)+"Unable to parse application with id '" + appNode + "', ignoring.");
return Optional.empty();
}
}
@Override
public Transaction createPutApplicationTransaction(ApplicationId applicationId, long sessionId) {
if (listApplications().contains(applicationId)) {
return new CuratorTransaction(curator).add(CuratorOperations.setData(tenantRoot.append(applicationId.serializedForm()).getAbsolute(), Utf8.toAsciiBytes(sessionId)));
} else {
return new CuratorTransaction(curator).add(CuratorOperations.create(tenantRoot.append(applicationId.serializedForm()).getAbsolute(), Utf8.toAsciiBytes(sessionId)));
}
}
@Override
public long getSessionIdForApplication(ApplicationId applicationId) {
return readSessionId(applicationId, applicationId.serializedForm());
}
@Override
public CuratorTransaction deleteApplication(ApplicationId applicationId) {
Path path = tenantRoot.append(applicationId.serializedForm());
return CuratorTransaction.from(CuratorOperations.delete(path.getAbsolute()), curator);
}
@Override
public void close() {
directoryCache.close();
pathChildrenExecutor.shutdown();
}
@Override
public void childEvent(CuratorFramework client, PathChildrenCacheEvent event) throws Exception {
switch (event.getType()) {
case CHILD_ADDED:
applicationAdded(ApplicationId.fromSerializedForm(Path.fromString(event.getData().getPath()).getName()));
break;
case CHILD_REMOVED:
applicationRemoved(ApplicationId.fromSerializedForm(Path.fromString(event.getData().getPath()).getName()));
break;
}
}
private void applicationRemoved(ApplicationId applicationId) {
reloadHandler.removeApplication(applicationId);
log.log(LogLevel.DEBUG, Tenants.logPre(applicationId) + "Application removed: " + applicationId);
}
private void applicationAdded(ApplicationId applicationId) {
log.log(LogLevel.DEBUG, Tenants.logPre(applicationId) + "Application added: " + applicationId);
}
}
|
