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Java client for Appium Mobile Webdriver
/*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* See the NOTICE file distributed with this work for additional
* information regarding copyright ownership.
* 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 io.appium.java_client.service.local;
import static com.google.common.base.Preconditions.checkNotNull;
import static io.appium.java_client.service.local.AppiumServiceBuilder.BROADCAST_IP_ADDRESS;
import static org.slf4j.event.Level.DEBUG;
import static org.slf4j.event.Level.INFO;
import com.google.common.annotations.VisibleForTesting;
import org.apache.commons.lang3.StringUtils;
import org.openqa.selenium.net.UrlChecker;
import org.openqa.selenium.os.CommandLine;
import org.openqa.selenium.remote.service.DriverService;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.slf4j.event.Level;
import java.io.File;
import java.io.IOException;
import java.io.OutputStream;
import java.lang.reflect.Field;
import java.net.MalformedURLException;
import java.net.URL;
import java.time.Duration;
import java.util.List;
import java.util.Map;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.locks.ReentrantLock;
import java.util.function.BiConsumer;
import java.util.function.Consumer;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import javax.annotation.Nullable;
public final class AppiumDriverLocalService extends DriverService {
private static final String URL_MASK = "http://%s:%d/wd/hub";
private static final Logger LOG = LoggerFactory.getLogger(AppiumDriverLocalService.class);
private static final Pattern LOG_MESSAGE_PATTERN = Pattern.compile("^(.*)\\R");
private static final Pattern LOGGER_CONTEXT_PATTERN = Pattern.compile("^(\\[debug\\] )?\\[(.+?)\\]");
private static final String APPIUM_SERVICE_SLF4J_LOGGER_PREFIX = "appium.service";
private static final Duration DESTROY_TIMEOUT = Duration.ofSeconds(60);
private final File nodeJSExec;
private final List nodeJSArgs;
private final Map nodeJSEnvironment;
private final Duration startupTimeout;
private final ReentrantLock lock = new ReentrantLock(true); //uses "fair" thread ordering policy
private final ListOutputStream stream = new ListOutputStream().add(System.out);
private final URL url;
private CommandLine process = null;
AppiumDriverLocalService(String ipAddress, File nodeJSExec, int nodeJSPort, Duration startupTimeout,
List nodeJSArgs, Map nodeJSEnvironment) throws IOException {
super(nodeJSExec, nodeJSPort, startupTimeout, nodeJSArgs, nodeJSEnvironment);
this.nodeJSExec = nodeJSExec;
this.nodeJSArgs = nodeJSArgs;
this.nodeJSEnvironment = nodeJSEnvironment;
this.startupTimeout = startupTimeout;
this.url = new URL(String.format(URL_MASK, ipAddress, nodeJSPort));
}
public static AppiumDriverLocalService buildDefaultService() {
return buildService(new AppiumServiceBuilder());
}
public static AppiumDriverLocalService buildService(AppiumServiceBuilder builder) {
return builder.build();
}
/**
* Base URL.
*
* @return The base URL for the managed appium server.
*/
@Override
public URL getUrl() {
return url;
}
@Override
public boolean isRunning() {
lock.lock();
try {
if (process == null) {
return false;
}
if (!process.isRunning()) {
return false;
}
try {
ping(Duration.ofMillis(1500));
return true;
} catch (UrlChecker.TimeoutException e) {
return false;
} catch (MalformedURLException e) {
throw new AppiumServerHasNotBeenStartedLocallyException(e.getMessage(), e);
}
} finally {
lock.unlock();
}
}
private void ping(Duration timeout) throws UrlChecker.TimeoutException, MalformedURLException {
// The operating system might block direct access to the universal broadcast IP address
URL status = new URL(url.toString().replace(BROADCAST_IP_ADDRESS, "127.0.0.1") + "/status");
new UrlChecker().waitUntilAvailable(timeout.toMillis(), TimeUnit.MILLISECONDS, status);
}
/**
* Starts the defined appium server.
*
* @throws AppiumServerHasNotBeenStartedLocallyException If an error occurs while spawning the child process.
* @see #stop()
*/
public void start() throws AppiumServerHasNotBeenStartedLocallyException {
lock.lock();
try {
if (isRunning()) {
return;
}
try {
process = new CommandLine(this.nodeJSExec.getCanonicalPath(),
nodeJSArgs.toArray(new String[]{}));
process.setEnvironmentVariables(nodeJSEnvironment);
process.copyOutputTo(stream);
process.executeAsync();
ping(startupTimeout);
} catch (Throwable e) {
destroyProcess();
String msgTxt = "The local appium server has not been started. "
+ "The given Node.js executable: " + this.nodeJSExec.getAbsolutePath()
+ " Arguments: " + nodeJSArgs.toString() + " " + "\n";
if (process != null) {
String processStream = process.getStdOut();
if (!StringUtils.isBlank(processStream)) {
msgTxt = msgTxt + "Process output: " + processStream + "\n";
}
}
throw new AppiumServerHasNotBeenStartedLocallyException(msgTxt, e);
}
} finally {
lock.unlock();
}
}
/**
* Stops this service is it is currently running. This method will attempt to block until the
* server has been fully shutdown.
*
* @see #start()
*/
@Override
public void stop() {
lock.lock();
try {
if (process != null) {
destroyProcess();
}
process = null;
} finally {
lock.unlock();
}
}
/**
* Destroys the service if it is running.
*
* @param timeout The maximum time to wait before the process will be force-killed.
* @return The exit code of the process or zero if the process was not running.
*/
private int destroyProcess(Duration timeout) {
if (!process.isRunning()) {
return 0;
}
// This all magic is necessary, because Selenium does not publicly expose
// process killing timeouts. By default a process is killed forcibly if
// it does not exit after two seconds, which is in most cases not enough for
// Appium
try {
Field processField = process.getClass().getDeclaredField("process");
processField.setAccessible(true);
Object osProcess = processField.get(process);
Field watchdogField = osProcess.getClass().getDeclaredField("executeWatchdog");
watchdogField.setAccessible(true);
Object watchdog = watchdogField.get(osProcess);
Field nativeProcessField = watchdog.getClass().getDeclaredField("process");
nativeProcessField.setAccessible(true);
Process nativeProcess = (Process) nativeProcessField.get(watchdog);
nativeProcess.destroy();
nativeProcess.waitFor(timeout.toMillis(), TimeUnit.MILLISECONDS);
} catch (Exception e) {
LOG.warn("No explicit timeout could be applied to the process termination", e);
}
return process.destroy();
}
/**
* Destroys the service.
* This methods waits up to `DESTROY_TIMEOUT` seconds for the Appium service
* to exit gracefully.
*/
private void destroyProcess() {
destroyProcess(DESTROY_TIMEOUT);
}
/**
* Logs as string.
*
* @return String logs if the server has been run. Null is returned otherwise.
*/
@Nullable
public String getStdOut() {
if (process != null) {
return process.getStdOut();
}
return null;
}
/**
* Adds other output stream which should accept server output data.
*
* @param outputStream is an instance of {@link OutputStream}
* that is ready to accept server output
*/
public void addOutPutStream(OutputStream outputStream) {
checkNotNull(outputStream, "outputStream parameter is NULL!");
stream.add(outputStream);
}
/**
* Adds other output streams which should accept server output data.
*
* @param outputStreams is a list of additional {@link OutputStream}
* that are ready to accept server output
*/
public void addOutPutStreams(List outputStreams) {
checkNotNull(outputStreams, "outputStreams parameter is NULL!");
for (OutputStream stream : outputStreams) {
addOutPutStream(stream);
}
}
/**
* Remove all existing server output streams.
*
* @return true if at least one output stream has been cleared
*/
public boolean clearOutPutStreams() {
return stream.clear();
}
/**
* Enables server output data logging through
* SLF4J loggers. This allow server output
* data to be configured with your preferred logging frameworks (e.g.
* java.util.logging, logback, log4j).
*
* NOTE1: You might want to call method {@link #clearOutPutStreams()} before
* calling this method.
* NOTE2: it is required that {@code --log-timestamp} server flag is
* {@code false}.
*
*
By default log messages are:
*
* - logged at {@code INFO} level, unless log message is pre-fixed by
* {@code [debug]} then logged at {@code DEBUG} level.
* - logged by a SLF4J logger instance with
* a name corresponding to the appium sub module as prefixed in log message
* (logger name is transformed to lower case, no spaces and prefixed with
* "appium.service.").
*
* Example log-message: "[ADB] Cannot read version codes of " is logged by
* logger: {@code appium.service.adb} at level {@code INFO}.
*
* Example log-message: "[debug] [XCUITest] Xcode version set to 'x.y.z' "
* is logged by logger {@code appium.service.xcuitest} at level
* {@code DEBUG}.
*
*
* @see #addSlf4jLogMessageConsumer(BiConsumer)
*/
public void enableDefaultSlf4jLoggingOfOutputData() {
addSlf4jLogMessageConsumer((logMessage, ctx) -> {
if (ctx.getLevel().equals(DEBUG)) {
ctx.getLogger().debug(logMessage);
} else {
ctx.getLogger().info(logMessage);
}
});
}
/**
* When a complete log message is available (from server output data) that
* message is parsed for its slf4j context (logger name, logger level etc.)
* and the specified {@code BiConsumer} is invoked with the log message and
* slf4j context.
*
* Use this method only if you want a behavior that differentiates from the
* default behavior as enabled by method
* {@link #enableDefaultSlf4jLoggingOfOutputData()}.
*
*
NOTE: You might want to call method {@link #clearOutPutStreams()} before
* calling this method.
*
*
implementation detail:
*
* - if log message begins with {@code [debug]} then log level is set to
* {@code DEBUG}, otherwise log level is {@code INFO}.
* - the appium sub module name is parsed from the log message and used as
* logger name (prefixed with "appium.service.", all lower case, spaces
* removed). If no appium sub module is detected then "appium.service" is
* used as logger name.
*
* Example log-message: "[ADB] Cannot read version codes of " is logged by
* {@code appium.service.adb} at level {@code INFO}
* Example log-message: "[debug] [XCUITest] Xcode version set to 'x.y.z' "
* is logged by {@code appium.service.xcuitest} at level {@code DEBUG}
*
*
* @param slf4jLogMessageConsumer BiConsumer block to be executed when a log message is
* available.
*/
public void addSlf4jLogMessageConsumer(BiConsumer slf4jLogMessageConsumer) {
checkNotNull(slf4jLogMessageConsumer, "slf4jLogMessageConsumer parameter is NULL!");
addLogMessageConsumer(logMessage -> {
slf4jLogMessageConsumer.accept(logMessage, parseSlf4jContextFromLogMessage(logMessage));
});
}
@VisibleForTesting
static Slf4jLogMessageContext parseSlf4jContextFromLogMessage(String logMessage) {
Matcher m = LOGGER_CONTEXT_PATTERN.matcher(logMessage);
String loggerName = APPIUM_SERVICE_SLF4J_LOGGER_PREFIX;
Level level = INFO;
if (m.find()) {
loggerName += "." + m.group(2).toLowerCase().replaceAll("\\s+", "");
if (m.group(1) != null) {
level = DEBUG;
}
}
return new Slf4jLogMessageContext(loggerName, level);
}
/**
* When a complete log message is available (from server output data), the
* specified {@code Consumer} is invoked with that log message.
*
* NOTE: You might want to call method {@link #clearOutPutStreams()} before
* calling this method.
*
*
If the Consumer fails and throws an exception the exception is logged (at
* WARN level) and execution continues.
*
*
* @param consumer Consumer block to be executed when a log message is available.
*/
public void addLogMessageConsumer(Consumer consumer) {
checkNotNull(consumer, "consumer parameter is NULL!");
addOutPutStream(new OutputStream() {
StringBuilder lineBuilder = new StringBuilder();
@Override
public void write(int chr) {
try {
lineBuilder.append((char) chr);
Matcher matcher = LOG_MESSAGE_PATTERN.matcher(lineBuilder.toString());
if (matcher.matches()) {
consumer.accept(matcher.group(1));
lineBuilder = new StringBuilder();
}
} catch (Exception e) {
// log error and continue
LOG.warn("Log message consumer crashed!", e);
}
}
});
}
}