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Core module for the google-cloud.
/*
* Copyright 2015 Google LLC
*
* 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.
*/
package com.google.cloud;
import static com.google.common.base.MoreObjects.firstNonNull;
import static com.google.common.base.Preconditions.checkArgument;
import static com.google.common.base.Preconditions.checkNotNull;
import com.google.api.client.http.GenericUrl;
import com.google.api.client.http.HttpHeaders;
import com.google.api.client.http.HttpRequest;
import com.google.api.client.http.HttpRequestFactory;
import com.google.api.client.http.HttpResponse;
import com.google.api.client.http.HttpTransport;
import com.google.api.client.http.javanet.NetHttpTransport;
import com.google.api.client.json.GenericJson;
import com.google.api.client.json.JsonFactory;
import com.google.api.client.json.JsonObjectParser;
import com.google.api.client.json.jackson2.JacksonFactory;
import com.google.api.client.util.Charsets;
import com.google.api.core.ApiClock;
import com.google.api.core.BetaApi;
import com.google.api.core.CurrentMillisClock;
import com.google.api.core.InternalApi;
import com.google.api.gax.core.GaxProperties;
import com.google.api.gax.retrying.RetrySettings;
import com.google.api.gax.rpc.FixedHeaderProvider;
import com.google.api.gax.rpc.HeaderProvider;
import com.google.api.gax.rpc.NoHeaderProvider;
import com.google.auth.Credentials;
import com.google.auth.oauth2.GoogleCredentials;
import com.google.auth.oauth2.ServiceAccountCredentials;
import com.google.cloud.spi.ServiceRpcFactory;
import com.google.common.collect.ImmutableMap;
import com.google.common.collect.Iterables;
import com.google.common.io.Files;
import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.ObjectInputStream;
import java.io.Serializable;
import java.nio.charset.Charset;
import java.util.Locale;
import java.util.Map;
import java.util.Objects;
import java.util.ServiceLoader;
import java.util.Set;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import org.threeten.bp.Duration;
/**
* Abstract class representing service options.
*
* @param the service subclass
* @param the {@code ServiceOptions} subclass corresponding to the service
*/
public abstract class ServiceOptions,
OptionsT extends ServiceOptions> implements Serializable {
public static final String CREDENTIAL_ENV_NAME = "GOOGLE_APPLICATION_CREDENTIALS";
private static final String DEFAULT_HOST = "https://www.googleapis.com";
private static final String LEGACY_PROJECT_ENV_NAME = "GCLOUD_PROJECT";
private static final String PROJECT_ENV_NAME = "GOOGLE_CLOUD_PROJECT";
private static final RetrySettings DEFAULT_RETRY_SETTINGS = getDefaultRetrySettingsBuilder()
.build();
private static final RetrySettings NO_RETRY_SETTINGS = getDefaultRetrySettingsBuilder()
.setMaxAttempts(1).build();
private static final long serialVersionUID = 9198896031667942014L;
private final String projectId;
private final String host;
private final RetrySettings retrySettings;
private final String serviceRpcFactoryClassName;
private final String serviceFactoryClassName;
private final ApiClock clock;
protected Credentials credentials;
private final TransportOptions transportOptions;
private final HeaderProvider headerProvider;
private transient ServiceRpcFactory serviceRpcFactory;
private transient ServiceFactory serviceFactory;
private transient ServiceT service;
private transient ServiceRpc rpc;
/**
* Builder for {@code ServiceOptions}.
*
* @param the service subclass
* @param the {@code ServiceOptions} subclass corresponding to the service
* @param the {@code ServiceOptions} builder
*/
public abstract static class Builder,
OptionsT extends ServiceOptions,
B extends Builder> {
private String projectId;
private String host;
protected Credentials credentials;
private RetrySettings retrySettings;
private ServiceFactory serviceFactory;
private ServiceRpcFactory serviceRpcFactory;
private ApiClock clock;
private TransportOptions transportOptions;
private HeaderProvider headerProvider;
@InternalApi("This class should only be extended within google-cloud-java")
protected Builder() {}
@InternalApi("This class should only be extended within google-cloud-java")
protected Builder(ServiceOptions options) {
projectId = options.projectId;
host = options.host;
credentials = options.credentials;
retrySettings = options.retrySettings;
serviceFactory = options.serviceFactory;
serviceRpcFactory = options.serviceRpcFactory;
clock = options.clock;
transportOptions = options.transportOptions;
}
protected abstract ServiceOptions build();
@SuppressWarnings("unchecked")
protected B self() {
return (B) this;
}
/**
* Sets the service factory.
*/
public B setServiceFactory(ServiceFactory serviceFactory) {
this.serviceFactory = serviceFactory;
return self();
}
/**
* Sets the service's clock. The clock is mainly used for testing purpose. {@link ApiClock}
* will be replaced by Java8's {@code java.time.Clock}.
*
* @param clock the clock to set
* @return the builder
*/
public B setClock(ApiClock clock) {
this.clock = clock;
return self();
}
/**
* Sets the project ID. If no project ID is set, {@link #getDefaultProjectId()} will be used to
* attempt getting the project ID from the environment.
*
* @return the builder
*/
public B setProjectId(String projectId) {
this.projectId = projectId;
return self();
}
/**
* Sets service host.
*
* @return the builder
*/
public B setHost(String host) {
this.host = host;
return self();
}
/**
* Sets the service authentication credentials. If no credentials are set,
* {@link GoogleCredentials#getApplicationDefault()} will be used to attempt getting credentials
* from the environment. Use {@link NoCredentials#getInstance()} to skip authentication, this is
* typically useful when using local service emulators.
*
* @param credentials authentication credentials, should not be {@code null}
* @return the builder
* @throws NullPointerException if {@code credentials} is {@code null}. To disable
* authentication use {@link NoCredentials#getInstance()}
*/
public B setCredentials(Credentials credentials) {
this.credentials = checkNotNull(credentials);
// set project id if available
if (this.projectId == null &&
credentials instanceof ServiceAccountCredentials) {
this.projectId = ((ServiceAccountCredentials) credentials).getProjectId();
}
return self();
}
/**
* Sets configuration parameters for request retries.
*
* @return the builder
*/
public B setRetrySettings(RetrySettings retrySettings) {
this.retrySettings = retrySettings;
return self();
}
/**
* Sets the factory for rpc services.
*
* @return the builder
*/
public B setServiceRpcFactory(ServiceRpcFactory serviceRpcFactory) {
this.serviceRpcFactory = serviceRpcFactory;
return self();
}
/**
* Sets the transport options.
*
* @return the builder
*/
public B setTransportOptions(TransportOptions transportOptions) {
this.transportOptions = transportOptions;
return self();
}
/**
* Sets the static header provider. The header provider will be called during client
* construction only once. The headers returned by the provider will be cached and supplied as
* is for each request issued by the constructed client. Some reserved headers can be overridden
* (e.g. Content-Type) or merged with the default value (e.g. User-Agent) by the underlying
* transport layer.
*
* @param headerProvider the header provider
* @return the builder
*/
@BetaApi
public B setHeaderProvider(HeaderProvider headerProvider) {
this.headerProvider = headerProvider;
return self();
}
}
@InternalApi("This class should only be extended within google-cloud-java")
protected ServiceOptions(Class> serviceFactoryClass,
Class> rpcFactoryClass,
Builder builder,
ServiceDefaults serviceDefaults) {
projectId = builder.projectId != null ? builder.projectId : getDefaultProject();
if (projectIdRequired()) {
checkArgument(
projectId != null,
"A project ID is required for this service but could not be determined from the builder "
+ "or the environment. Please set a project ID using the builder.");
}
host = firstNonNull(builder.host, getDefaultHost());
credentials = builder.credentials != null ? builder.credentials : defaultCredentials();
retrySettings = firstNonNull(builder.retrySettings, getDefaultRetrySettings());
serviceFactory = firstNonNull(builder.serviceFactory,
getFromServiceLoader(serviceFactoryClass, serviceDefaults.getDefaultServiceFactory()));
serviceFactoryClassName = serviceFactory.getClass().getName();
serviceRpcFactory = firstNonNull(builder.serviceRpcFactory,
getFromServiceLoader(rpcFactoryClass, serviceDefaults.getDefaultRpcFactory()));
serviceRpcFactoryClassName = serviceRpcFactory.getClass().getName();
clock = firstNonNull(builder.clock, CurrentMillisClock.getDefaultClock());
transportOptions = firstNonNull(builder.transportOptions,
serviceDefaults.getDefaultTransportOptions());
headerProvider = firstNonNull(builder.headerProvider, new NoHeaderProvider());
}
/**
* Returns whether a service requires a project ID. This method may be overridden in
* service-specific Options objects.
*
* @return true if a project ID is required to use the service, false if not
*/
protected boolean projectIdRequired() {
return true;
}
private static GoogleCredentials defaultCredentials() {
try {
return GoogleCredentials.getApplicationDefault();
} catch (Exception ex) {
return null;
}
}
protected String getDefaultHost() {
return DEFAULT_HOST;
}
protected String getDefaultProject() {
return getDefaultProjectId();
}
/**
* Returns the default project ID, or {@code null} if no default project ID could be found. This
* method returns the first available project ID among the following sources:
*
* - The project ID specified by the GOOGLE_CLOUD_PROJECT environment variable
*
- The App Engine project ID
*
- The project ID specified in the JSON credentials file pointed by the
* {@code GOOGLE_APPLICATION_CREDENTIALS} environment variable
*
- The Google Cloud SDK project ID
*
- The Compute Engine project ID
*
*/
public static String getDefaultProjectId() {
String projectId = System.getProperty(PROJECT_ENV_NAME, System.getenv(PROJECT_ENV_NAME));
if (projectId == null) {
projectId =
System.getProperty(LEGACY_PROJECT_ENV_NAME, System.getenv(LEGACY_PROJECT_ENV_NAME));
}
if (projectId == null) {
projectId = getAppEngineProjectId();
}
if (projectId == null) {
projectId = getServiceAccountProjectId();
}
return projectId != null ? projectId : getGoogleCloudProjectId();
}
public static String getAppEngineAppId() {
return System.getProperty("com.google.appengine.application.id");
}
private static String getActiveGoogleCloudConfig(File configDir) {
String activeGoogleCloudConfig = null;
try {
activeGoogleCloudConfig =
Files.readFirstLine(new File(configDir, "active_config"), Charset.defaultCharset());
} catch (IOException ex) {
// ignore
}
// if reading active_config failed or the file is empty we try default
return firstNonNull(activeGoogleCloudConfig, "default");
}
protected static String getGoogleCloudProjectId() {
File configDir;
if (System.getenv().containsKey("CLOUDSDK_CONFIG")) {
configDir = new File(System.getenv("CLOUDSDK_CONFIG"));
} else if (isWindows() && System.getenv().containsKey("APPDATA")) {
configDir = new File(System.getenv("APPDATA"), "gcloud");
} else {
configDir = new File(System.getProperty("user.home"), ".config/gcloud");
}
String activeConfig = getActiveGoogleCloudConfig(configDir);
FileReader fileReader = null;
try {
fileReader = new FileReader(new File(configDir, "configurations/config_" + activeConfig));
} catch (FileNotFoundException newConfigFileNotFoundEx) {
try {
fileReader = new FileReader(new File(configDir, "properties"));
} catch (FileNotFoundException oldConfigFileNotFoundEx) {
// ignore
}
}
if (fileReader != null) {
try (BufferedReader reader = new BufferedReader(fileReader)) {
String line;
String section = null;
Pattern projectPattern = Pattern.compile("^project\\s*=\\s*(.*)$");
Pattern sectionPattern = Pattern.compile("^\\[(.*)\\]$");
while ((line = reader.readLine()) != null) {
if (line.isEmpty() || line.startsWith(";")) {
continue;
}
line = line.trim();
Matcher matcher = sectionPattern.matcher(line);
if (matcher.matches()) {
section = matcher.group(1);
} else if (section == null || section.equals("core")) {
matcher = projectPattern.matcher(line);
if (matcher.matches()) {
return matcher.group(1);
}
}
}
} catch (IOException ex) {
// ignore
}
}
// return project id from metadata config
return MetadataConfig.getProjectId();
}
private static boolean isWindows() {
return System.getProperty("os.name").toLowerCase(Locale.ENGLISH).contains("windows");
}
protected static String getAppEngineProjectId() {
String projectId = null;
if (PlatformInformation.isOnGAEStandard7()) {
projectId = getAppEngineProjectIdFromAppId();
} else {
//for GAE flex and standard Java 8 environment
projectId = System.getenv("GOOGLE_CLOUD_PROJECT");
if (projectId == null) {
projectId = System.getenv("GCLOUD_PROJECT");
}
if (projectId == null) {
projectId = getAppEngineProjectIdFromAppId();
}
if (projectId == null) {
try {
projectId = getAppEngineProjectIdFromMetadataServer();
} catch (IOException ignore) {
projectId = null;
}
}
}
return projectId;
}
protected static String getAppEngineProjectIdFromAppId() {
String projectId = getAppEngineAppId();
if (projectId != null && projectId.contains(":")) {
int colonIndex = projectId.indexOf(":");
projectId = projectId.substring(colonIndex + 1);
}
return projectId;
}
private static String getAppEngineProjectIdFromMetadataServer() throws IOException {
String metadata = "http://metadata.google.internal";
String projectIdURL = "/computeMetadata/v1/project/project-id";
GenericUrl url = new GenericUrl(metadata + projectIdURL);
HttpTransport netHttpTransport = new NetHttpTransport();
HttpRequestFactory requestFactory = netHttpTransport.createRequestFactory();
HttpRequest request = requestFactory.buildGetRequest(url)
.setConnectTimeout(500)
.setReadTimeout(500)
.setHeaders(new HttpHeaders().set("Metadata-Flavor", "Google"));
HttpResponse response = request.execute();
return headerContainsMetadataFlavor(response) ? response.parseAsString() : null;
}
@InternalApi("Visible for testing")
static boolean headerContainsMetadataFlavor(HttpResponse response) {
String metadataFlavorValue = response.getHeaders().getFirstHeaderStringValue("Metadata-Flavor");
return "Google".equals(metadataFlavorValue);
}
protected static String getServiceAccountProjectId() {
return getServiceAccountProjectId(System.getenv(CREDENTIAL_ENV_NAME));
}
@InternalApi("Visible for testing")
static String getServiceAccountProjectId(String credentialsPath) {
String project = null;
if (credentialsPath != null) {
try (InputStream credentialsStream = new FileInputStream(credentialsPath)) {
JsonFactory jsonFactory = JacksonFactory.getDefaultInstance();
JsonObjectParser parser = new JsonObjectParser(jsonFactory);
GenericJson fileContents = parser.parseAndClose(
credentialsStream, Charsets.UTF_8, GenericJson.class);
project = (String) fileContents.get("project_id");
} catch (IOException e) {
// ignore
}
}
return project;
}
/**
* Returns a Service object for the current service. For instance, when using Google Cloud
* Storage, it returns a Storage object.
*/
@SuppressWarnings("unchecked")
public ServiceT getService() {
if (service == null) {
service = serviceFactory.create((OptionsT) this);
}
return service;
}
/**
* Returns a Service RPC object for the current service. For instance, when using Google Cloud
* Storage, it returns a StorageRpc object.
*/
@SuppressWarnings("unchecked")
public ServiceRpc getRpc() {
if (rpc == null) {
rpc = serviceRpcFactory.create((OptionsT) this);
}
return rpc;
}
/**
* Returns the project ID. Return value can be null (for services that don't require a project
* ID).
*/
public String getProjectId() {
return projectId;
}
/**
* Returns the service host.
*/
public String getHost() {
return host;
}
/**
* Returns the authentication credentials.
*/
public Credentials getCredentials() {
return credentials;
}
/**
* Returns the authentication credentials. If required, credentials are scoped.
*/
public Credentials getScopedCredentials() {
Credentials credentialsToReturn = credentials;
if (credentials instanceof GoogleCredentials
&& ((GoogleCredentials) credentials).createScopedRequired()) {
credentialsToReturn = ((GoogleCredentials) credentials).createScoped(getScopes());
}
return credentialsToReturn;
}
/**
* Returns configuration parameters for request retries.
*/
public RetrySettings getRetrySettings() {
return retrySettings;
}
/**
* Returns the service's clock. Default time source uses {@link System#currentTimeMillis()} to get
* current time.
*/
public ApiClock getClock() {
return clock;
}
/**
* Returns the transport-specific options for this service.
*/
public TransportOptions getTransportOptions() {
return transportOptions;
}
/**
* Returns the application's name as a string in the format {@code gcloud-java/[version]},
* optionally prepended with externally supplied User-Agent header value (via setting custom
* header provider).
*/
public String getApplicationName() {
String libraryVersion = getLibraryVersion();
// We have to do the following since underlying layers often do not appreciate User-Agent
// provided as a normal header and override it or treat setting "application name" as the only
// way to append something to User-Agent header.
StringBuilder sb = new StringBuilder();
String customUserAgentValue = getUserAgent();
if (customUserAgentValue != null) {
sb.append(customUserAgentValue).append(' ');
}
if (libraryVersion == null) {
sb.append(getLibraryName());
} else {
sb.append(getLibraryName()).append('/').append(libraryVersion);
}
return sb.toString();
}
/**
* Returns the library's name, {@code gcloud-java}, as a string.
*/
public static String getLibraryName() {
return "gcloud-java";
}
/**
* Returns the library's name used by x-goog-api-client header as a string.
*/
public static String getGoogApiClientLibName() {
return "gccl";
}
/**
* Returns the library's version as a string.
*/
public String getLibraryVersion() {
return GaxProperties.getLibraryVersion(this.getClass());
}
@InternalApi
public final HeaderProvider getMergedHeaderProvider(HeaderProvider internalHeaderProvider) {
Map mergedHeaders =
ImmutableMap.builder()
.putAll(internalHeaderProvider.getHeaders())
.putAll(headerProvider.getHeaders())
.build();
return FixedHeaderProvider.create(mergedHeaders);
}
@InternalApi
public final String getUserAgent() {
if (headerProvider != null) {
for (Map.Entry entry : headerProvider.getHeaders().entrySet()) {
if ("user-agent".equals(entry.getKey().toLowerCase())) {
return entry.getValue();
}
}
}
return null;
}
protected int baseHashCode() {
return Objects.hash(projectId, host, credentials, retrySettings, serviceFactoryClassName,
serviceRpcFactoryClassName, clock);
}
protected boolean baseEquals(ServiceOptions other) {
return Objects.equals(projectId, other.projectId)
&& Objects.equals(host, other.host)
&& Objects.equals(credentials, other.credentials)
&& Objects.equals(retrySettings, other.retrySettings)
&& Objects.equals(serviceFactoryClassName, other.serviceFactoryClassName)
&& Objects.equals(serviceRpcFactoryClassName, other.serviceRpcFactoryClassName)
&& Objects.equals(clock, clock);
}
private void readObject(ObjectInputStream input) throws IOException, ClassNotFoundException {
input.defaultReadObject();
serviceFactory = newInstance(serviceFactoryClassName);
serviceRpcFactory = newInstance(serviceRpcFactoryClassName);
}
@SuppressWarnings("unchecked")
@InternalApi
public static T newInstance(String className) throws IOException, ClassNotFoundException {
try {
return (T) Class.forName(className).newInstance();
} catch (InstantiationException | IllegalAccessException e) {
throw new IOException(e);
}
}
public static RetrySettings getDefaultRetrySettings() {
return DEFAULT_RETRY_SETTINGS;
}
public static RetrySettings getNoRetrySettings() {
return NO_RETRY_SETTINGS;
}
private static RetrySettings.Builder getDefaultRetrySettingsBuilder() {
return RetrySettings.newBuilder()
.setMaxAttempts(6)
.setInitialRetryDelay(Duration.ofMillis(1000L))
.setMaxRetryDelay(Duration.ofMillis(32_000L))
.setRetryDelayMultiplier(2.0)
.setTotalTimeout(Duration.ofMillis(50_000L))
.setInitialRpcTimeout(Duration.ofMillis(50_000L))
.setRpcTimeoutMultiplier(1.0)
.setMaxRpcTimeout(Duration.ofMillis(50_000L));
}
protected abstract Set getScopes();
public abstract > B toBuilder();
/**
* Some services may have different backoff requirements listed in their SLAs. Be sure to override
* this method in options subclasses when the service's backoff requirement differs from the
* default parameters listed in {@link RetrySettings}.
*/
protected RetrySettings defaultRetrySettings() {
return getDefaultRetrySettings();
}
@InternalApi
public static T getFromServiceLoader(Class clazz, T defaultInstance) {
return Iterables.getFirst(ServiceLoader.load(clazz), defaultInstance);
}
}