work-tracker-spring-boot

The Spring Boot Module

This module is intended to be used for Spring Boot projects. If you are using:

• Java with Web Servlet, see this module.
• Spring, see this module

Dependencies

See releases for the latest release

<dependencies>
    <dependency>
        <groupId>com.deere.isg.work-tracker</groupId>
        <artifactId>work-tracker-spring-boot</artifactId>
        <version>${work-tracker.version}</version>
    </dependency>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-web</artifactId>
        <version>1.5.9.RELEASE</version>
    </dependency>
    <!-- if you plan to use logback.groovy, use Groovy 2.4.0 or latest -->
    <dependency>
        <groupId>org.codehaus.groovy</groupId>
        <artifactId>groovy-all</artifactId>
        <version>2.4.0</version>
    </dependency>
</dependencies>

Note: Logback dependencies are already included with this library, so there is no need to explicitly include them in your pom.xml.

Spring @Configuration

We provide a default configurer WorkTrackerConfigurer that your application can extend and override any beans necessary. Below is a basic example:

NOTE - You are required to:

1. provide the SpringWork class, or a derivative of that class if you plan to have user authentication in your application, as the Type to WorkTrackerConfigurer
2. override workFactory to provide a Function of how to instantiate that Type

@Configuration
public class WorkTrackerConfig extends WorkTrackerConfigurer<SpringWork> {

   @Override
   public Function<ServletRequest, SpringWork> workFactory() {
       return SpringWork::new;
   }
}

Application with User Authentication

You are required to provide a derivative of SpringWork to the WorkTrackerConfigurer. This SpringWork subclass should override SpringWork#updateUserInformation(HttpServletRequest request) to add the user's username to the remoteUser by using Work#setRemoteUser(String). You can also add other information in the MDC if you intend to use it as context by using Work#addToMDC(String). Example (i.e. using spring-boot-starter-security):

WARNING: Please do not add any password to the MDC.

public class UserSpringWork extends SpringWork {
    public UserSpringWork(ServletRequest request) {
        super(request);
    }

    @Override
    public void updateUserInformation(HttpServletRequest request) {
        Authentication auth = SecurityContextHolder.getContext().getAuthentication();
        setRemoteUser(auth.getName()); FloodSensor
    }
}

Then for your WorkTrackerConfigurer:

@Configuration
public class WorkTrackerConfig extends WorkTrackerConfigurer<UserSpringWork> {

    @Override
    public Function<ServletRequest, UserSpringWork> workFactory() {
        return UserSpringWork::new;
    }
}

See example

Key Cleanser

Cleanse your metadata keys before adding them to the MDC by using the KeyCleanser interface. It provides you with the key, value, and the URI of the current request. PathMetadataCleanser is the default KeyCleanser.

NOTE: PathMetadataCleanser converts every key into snake_case since Work#addToMDC accepts only snake_case values. It is also provided, by default, in the WorkTrackerConfigurer as a bean.

PathMetadataCleanser has four steps: Reserved, Standard, Transform, and Banned:

• Reserved is for the metadata that are already used in work-tracker and simple words that aren't good context keys. If the key falls in this category, the cleanser will add a context to the key from the path. Example: requests for the URI /user/{id} will become user_id
• Standard is for converting keys with non-standard names into standardized keys. Example: comp_name can become complete_name. Add to this list using PathMetaDataCleanser.addStandard().
• Transform is a function you provide to convert keys that require more than just simple replacement, or apply a rule your application needs to apply to all keys.
• Banned is for blacklisting keys. Some keys are not allowed in Elasticsearch since they are reserved and would cause failure if they are uploaded to Elasticsearch. Banned keys will convert those keys in order to prevent Elasticsearch log upload failures. You can also use it to convert restricted keys into different ones.

Override keyCleanser in WorkTrackerConfigurer for adding more limits:

@Configuration
public class WorkTrackerConfig extends WorkTrackerConfigurer<SpringWork> {

    @Override
    public KeyCleanser keyCleanser() {
        PathMetadataCleanser cleanser = new PathMetadataCleanser();
        cleanser.addStandard("short_id", "standardized_id");
        cleanser.setTransformFunction(key -> key + "_suffix");
        cleanser.addBanned("banned", "good_id");
        return cleanser;
    }
//...    
}

Connection Limits

Request Bouncer requires Connection Limits to determine whether to reject a work if the work exceeds a particular limit. By default, ConnectionLimits provides limits for same session, same user, same service and total.

Automatic Limit detection

The WorkTrackerConfigurer can automatically get the max connection limit from your DataSource, which can be any database. It looks for the dataSource bean, if none is found or if the limit is less than 10, RequestBouncer will not be activated. The name for the dataSource bean is configurable using setDataSourceName. Example:

@Configuration
public class WorkTrackerConfig extends WorkTrackerConfigurer<SpringWork> {
    public WorkTrackerConfig() {
      setDataSourceName("sqlDataSource");
    }
    //...
}

Manual Limit

Another way of configuring the connectionLimits is by setting the limit. This will initialize the connectionLimits with the default types ( same session, same user, same service, total). If the limit is less than 10, connectionLimits will not be initialized. Example:

@Configuration
public class WorkTrackerConfig extends WorkTrackerConfigurer<SpringWork> {
    public WorkTrackerConfig() {
      setLimit(60);
    }
    //...
}

See ConnectionLimits for implementation details

More Limits

You can also provide your own limits as follows:

@Configuration
public class WorkTrackerConfig extends WorkTrackerConfigurer<SpringWork> {

    @Override
    public ConnectionLimits<SpringWork> connectionLimits() {
        ConnectionLimits<SpringWork> limits = new ConnectionLimits<>();
        // Or ConnectionLimits<SpringWork> limits = super.connectionLimits(); //to get limits from DataSource

        //Add more limits, if necessary
        //First way: limit, typeName and function
        limits.addConnectionLimit(25, "service").method(SpringWork::getService);
        //Second way: limit, typeName and Predicate
        limits.addConnectionLimit(20, "acceptHeader").test(w -> w.getAcceptHeader()
                .contains(MediaType.APPLICATION_XML_VALUE)
        );
        //limit, typeName and a dynamic predicate
        limits.addConnectionLimit(10, "acceptHeader")
                    .buildTest(incoming -> (incoming.getService().contains("foo") ? 
                        (w->incoming.getService().equals(w.getService())) : 
                        (w->false)));
        //limit, typeName and function to execute retry later calculation
        limits.addConnectionLimit(2, USER_TYPE).advanced(incoming -> Optional.of(incoming.getElapsedMillis()));
        //limit, typeName, floodSensor and function to execute retry later calculation
        limits.addConnectionLimit(2, USER_TYPE).advanced((floodSensor, incoming) -> Optional.of(incoming.getElapsedMillis()));
        return limits;

    }
    //...
}

Outstanding HttpServlet

We provide a WorkHttpServlet that outputs all the outstanding work that are currently in progress. This can be used for debugging purposes. By default, the uri is /health/outstanding and is provided by the WorkTrackerConfigurer;

Extra Features

• Interceptor for RestTemplates

We provide an HttpInterceptor that has Zombie protection for runaway requests (i.e. requests that can take too long and eventually become orphan because either they never return a value or the user has interrupted the request). This interceptor can be used with a RestTemplate or a similar database template in Spring. Add the following into your configuration class:

@Bean
public RestTemplate restTemplate() {
    RestTemplate template = new RestTemplate();
    template.getInterceptors().add(new ZombieHttpInterceptor());
    return template;
}

• MdcExecutor

Track your background tasks with the MdcExecutor. Example:

// Add these beans in your Configuration
@Bean
public TaskExecutor taskExecutor() {
  // Can use any executor, this is just an example
   ThreadPoolTaskExecutor executor = new ThreadPoolTaskExecutor();
   executor.setCorePoolSize(3);
   executor.setMaxPoolSize(5);
   executor.initialize();
   return executor;
}

@Bean
public Executor mdcTaskExecutor(@Qualifier("taskExecutor") TaskExecutor executor) {
   return new MdcExecutor(executor);
}

// Use it with Autowiring
@Autowiring
private MdcExecutor mdcExecutor;
//...
mdcExecutor.execute(someRunnable);

• Exclude Urls from Logging

You can exclude specific request urls from logging by calling excludePathPatterns with url patterns.

@Configuration
public class WorkTrackerConfig extends WorkTrackerConfigurer<SpringWork> {
    public WorkTrackerConfig() {
      excludePathPatterns("/favicon.ico"); // no logs for /favicon.ico requests
    }
    //...
}

Testing

Start with this to test-drive adding in the work-tracker to your application.

import com.deere.isg.worktracker.servlet.WorkConfig;
import org.hamcrest.Matchers;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.boot.test.mock.mockito.SpyBean;
import org.springframework.boot.test.web.client.TestRestTemplate;
import org.springframework.test.context.junit4.SpringRunner;

import static org.hamcrest.MatcherAssert.assertThat;
import static org.hamcrest.core.IsNull.notNullValue;
import static org.springframework.boot.test.context.SpringBootTest.WebEnvironment.RANDOM_PORT;


@RunWith(SpringRunner.class)
@SpringBootTest(webEnvironment = RANDOM_PORT)
public class ApplicationWorkTrackerTest {

    @Autowired
    private TestRestTemplate restTemplate;

    @SpyBean
    private WorkConfig<?> workConfig;

    @Test
    public void basicConfigurationTest() {
        assertThat("Uses work tracking", workConfig.getOutstanding(), notNullValue());
        assertThat("Detects Zombies", workConfig.getDetector(), notNullValue());
        assertThat("Has DoS protection", workConfig.getFloodSensor(), notNullValue());
    }

    @Test
    public void endToEndTest() {
        String body = this.restTemplate.getForObject("/health/outstanding", String.class);
        assertThat(body, Matchers.not(Matchers.containsString("\"status\":500")));
        assertThat(body, Matchers.containsString("<td>GET /health/outstanding</td>"));
    }
}