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An example Spring Boot project using HRRS.

Project employs the following components of the hrrs-servlet-filter-base64 artifact:

  • Base64HrrsFilter is used to inject a servlet filter to record incoming HTTP requests. The recorded requests are written to a rotating file created at start-up with hrrs-spring-records-%d{yyyyMMdd-HHmmss-SSS}.csv pattern in the directory pointed by java.io.tmpdir property.

  • HrrsServlet is mapped to /hrrs endpoint to enable/disable the servlet filter at runtime.

You can start the application either through exec:java Maven goal or by running the HelloApplication#main() method in your IDE. The provided HelloController exposes a POST method handler on /hello?name=<name> endpoint which you can query.

$ git clone git@github.com:vy/hrrs.git          # clone the project
$ cd hrrs
$ mvn install                                   # make sure HRRS artifacts are placed into your local repository
$ mvn -pl examples/spring exec:java             # run the exec:java goal
[INFO] Scanning for projects...
[INFO]
[INFO] ------------------------------------------------------------------------
[INFO] Building hrrs-example-spring 0.2-SNAPSHOT
[INFO] ------------------------------------------------------------------------
[INFO]
[INFO] --- exec-maven-plugin:1.6.0:java (default-cli) @ hrrs-example-spring ---
2017-05-05 11:14:22.225  INFO 7590 --- [lication.main()] c.v.h.example.spring.HelloApplication    : Starting HelloApplication on varlik with PID 7590 (/home/vy/Projects/bol/hrrs/examples/spring/_target/classes started by vy in /home/vy/Projects/bol/hrrs)
2017-05-05 11:14:22.230 DEBUG 7590 --- [lication.main()] c.v.h.example.spring.HelloApplication    : Running with Spring Boot v1.4.2.RELEASE, Spring v4.3.4.RELEASE
2017-05-05 11:14:22.230  INFO 7590 --- [lication.main()] c.v.h.example.spring.HelloApplication    : No active profile set, falling back to default profiles: default
2017-05-05 11:14:22.317  INFO 7590 --- [lication.main()] ationConfigEmbeddedWebApplicationContext : Refreshing org.springframework.boot.context.embedded.AnnotationConfigEmbeddedWebApplicationContext@30b643cf: startup date [Fri May 05 11:14:22 CEST 2017]; root of context hierarchy
2017-05-05 11:14:23.281  INFO 7590 --- [lication.main()] f.a.AutowiredAnnotationBeanPostProcessor : JSR-330 'javax.inject.Inject' annotation found and supported for autowiring
2017-05-05 11:14:23.765  INFO 7590 --- [lication.main()] s.b.c.e.t.TomcatEmbeddedServletContainer : Tomcat initialized with port(s): 8080 (http)
2017-05-05 11:14:23.779  INFO 7590 --- [lication.main()] o.apache.catalina.core.StandardService   : Starting service Tomcat
2017-05-05 11:14:23.780  INFO 7590 --- [lication.main()] org.apache.catalina.core.StandardEngine  : Starting Servlet Engine: Apache Tomcat/8.5.6
2017-05-05 11:14:23.906  INFO 7590 --- [ost-startStop-1] o.a.c.c.C.[Tomcat].[localhost].[/]       : Initializing Spring embedded WebApplicationContext
2017-05-05 11:14:23.907  INFO 7590 --- [ost-startStop-1] o.s.web.context.ContextLoader            : Root WebApplicationContext: initialization completed in 1593 ms
2017-05-05 11:14:24.042 TRACE 7590 --- [ost-startStop-1] ttpRequestRecordWriterRotatingFile_target : instantiated (file=/tmp/hrrs-spring-records.csv, charset=US-ASCII)
2017-05-05 11:14:24.108  INFO 7590 --- [ost-startStop-1] o.s.b.w.servlet.ServletRegistrationBean  : Mapping servlet: 'hrrsServlet' to [/hrrs]
2017-05-05 11:14:24.110  INFO 7590 --- [ost-startStop-1] o.s.b.w.servlet.ServletRegistrationBean  : Mapping servlet: 'dispatcherServlet' to [/]
2017-05-05 11:14:24.114  INFO 7590 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean   : Mapping filter: 'characterEncodingFilter' to: [/*]
2017-05-05 11:14:24.114  INFO 7590 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean   : Mapping filter: 'hiddenHttpMethodFilter' to: [/*]
2017-05-05 11:14:24.115  INFO 7590 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean   : Mapping filter: 'httpPutFormContentFilter' to: [/*]
2017-05-05 11:14:24.115  INFO 7590 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean   : Mapping filter: 'requestContextFilter' to: [/*]
2017-05-05 11:14:24.115  INFO 7590 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean   : Mapping filter: 'provideHrrsFilter' to: [/*]
2017-05-05 11:14:24.145 TRACE 7590 --- [ost-startStop-1] com.vlkan.hrrs.servlet.HrrsFilter        : initialized
2017-05-05 11:14:24.464  INFO 7590 --- [lication.main()] s.w.s.m.m.a.RequestMappingHandlerAdapter : Looking for @ControllerAdvice: org.springframework.boot.context.embedded.AnnotationConfigEmbeddedWebApplicationContext@30b643cf: startup date [Fri May 05 11:14:22 CEST 2017]; root of context hierarchy
2017-05-05 11:14:24.560  INFO 7590 --- [lication.main()] s.w.s.m.m.a.RequestMappingHandlerMapping : Mapped "{[/hello],methods=[POST],consumes=[text/plain],produces=[text/plain]}" onto public org.springframework.http.ResponseEntity<java.lang.String> com.vlkan.hrrs.example.spring.HelloController.sayHello(java.lang.String,byte[])
2017-05-05 11:14:24.565  INFO 7590 --- [lication.main()] s.w.s.m.m.a.RequestMappingHandlerMapping : Mapped "{[/error],produces=[text/html]}" onto public org.springframework.web.servlet.ModelAndView org.springframework.boot.autoconfigure.web.BasicErrorController.errorHtml(javax.servlet.http.HttpServletRequest,javax.servlet.http.HttpServletResponse)
2017-05-05 11:14:24.566  INFO 7590 --- [lication.main()] s.w.s.m.m.a.RequestMappingHandlerMapping : Mapped "{[/error]}" onto public org.springframework.http.ResponseEntity<java.util.Map<java.lang.String, java.lang.Object>> org.springframework.boot.autoconfigure.web.BasicErrorController.error(javax.servlet.http.HttpServletRequest)
2017-05-05 11:14:24.614  INFO 7590 --- [lication.main()] o.s.w.s.handler.SimpleUrlHandlerMapping  : Mapped URL path [/webjars/**] onto handler of type [class org.springframework.web.servlet.resource.ResourceHttpRequestHandler]
2017-05-05 11:14:24.614  INFO 7590 --- [lication.main()] o.s.w.s.handler.SimpleUrlHandlerMapping  : Mapped URL path [/**] onto handler of type [class org.springframework.web.servlet.resource.ResourceHttpRequestHandler]
2017-05-05 11:14:24.664  INFO 7590 --- [lication.main()] o.s.w.s.handler.SimpleUrlHandlerMapping  : Mapped URL path [/**/favicon.ico] onto handler of type [class org.springframework.web.servlet.resource.ResourceHttpRequestHandler]
2017-05-05 11:14:24.804  INFO 7590 --- [lication.main()] o.s.j.e.a.AnnotationMBeanExporter        : Registering beans for JMX exposure on startup
2017-05-05 11:14:24.859  INFO 7590 --- [lication.main()] s.b.c.e.t.TomcatEmbeddedServletContainer : Tomcat started on port(s): 8080 (http)
2017-05-05 11:14:24.864  INFO 7590 --- [lication.main()] c.v.h.example.spring.HelloApplication    : Started HelloApplication in 3.353 seconds (JVM running for 5.843)

See the /tmp/hrrs-spring-records.csv file in the output? That's the file where the recorded HTTP requests will be stored. Let's start with querying and changing the state of the servlet filter:

$ curl http://localhost:8080/hrrs
{"enabled": false}

$ curl -X PUT http://localhost:8080/hrrs?enabled=true

We are good to go. Now we can create some noise.

$ curl -H "Content-Type: text/plain" -d "some random payload" http://localhost:8080/hello?name=Volkan
Hello, Volkan! (19)

Note the Hello, Volkan! (19) reply we got from the endpoint. Let's create some more noise to force JVM to flush the file buffers. (You can also enforce HRRS to flush via curl -X POST http://localhost:8080/hrrs.)

$ for iter in $(seq 100); do
  curl -H "Content-Type: text/plain" -d "payload-$iter" "http://localhost:8080/hello?name=User-$iter";
  done
Hello, User-1! (9)
Hello, User-2! (9)
...
Hello, User-98! (10)
Hello, User-99! (10)
Hello, User-100! (11)

Now we can examine the recorded HTTP requests:

$ head -n 1 /tmp/hrrs-spring-records.csv
j2bntok7_1ncux  20170505-115026.455+0200  hello  POST  ABIvaGVsbG8/bmFtZT1Wb2xrYW4AAAAFAARob3N0AA5sb2NhbGhvc3Q6ODA4MAAKdXNlci1hZ2VudAALY3VybC83LjQ3LjAABmFjY2VwdAADKi8qAA5jb250ZW50LWxlbmd0aAACMTkADGNvbnRlbnQtdHlwZQAhYXBwbGljYXRpb24veC13d3ctZm9ybS11cmxlbmNvZGVkAAAAAAAAAAAAAAAA

$ head -n 3 /tmp/hrrs-spring-records-9056751296977530502.csv | awk '{print $5}' | base64 --decode | hd
00000000  00 12 2f 68 65 6c 6c 6f  3f 6e 61 6d 65 3d 56 6f  |../hello?name=Vo|
00000010  6c 6b 61 6e 00 00 00 05  00 04 68 6f 73 74 00 0e  |lkan......host..|
00000020  6c 6f 63 61 6c 68 6f 73  74 3a 38 30 38 30 00 0a  |localhost:8080..|
00000030  75 73 65 72 2d 61 67 65  6e 74 00 0b 63 75 72 6c  |user-agent..curl|
00000040  2f 37 2e 34 37 2e 30 00  06 61 63 63 65 70 74 00  |/7.47.0..accept.|
00000050  03 2a 2f 2a 00 0e 63 6f  6e 74 65 6e 74 2d 6c 65  |.*/*..content-le|
00000060  6e 67 74 68 00 02 31 39  00 0c 63 6f 6e 74 65 6e  |ngth..19..conten|
00000070  74 2d 74 79 70 65 00 21  61 70 70 6c 69 63 61 74  |t-type.!applicat|
00000080  69 6f 6e 2f 78 2d 77 77  77 2d 66 6f 72 6d 2d 75  |ion/x-www-form-u|
00000090  72 6c 65 6e 63 6f 64 65  64 00 00 00 00 00 00 00  |rlencoded.......|
000000a0  00 00 00 00 00 00 12 2f  68 65 6c 6c 6f 3f 6e 61  |......./hello?na|
000000b0  6d 65 3d 55 73 65 72 2d  31 00 00 00 05 00 04 68  |me=User-1......h|
000000c0  6f 73 74 00 0e 6c 6f 63  61 6c 68 6f 73 74 3a 38  |ost..localhost:8|
000000d0  30 38 30 00 0a 75 73 65  72 2d 61 67 65 6e 74 00  |080..user-agent.|
000000e0  0b 63 75 72 6c 2f 37 2e  34 37 2e 30 00 06 61 63  |.curl/7.47.0..ac|
000000f0  63 65 70 74 00 03 2a 2f  2a 00 0e 63 6f 6e 74 65  |cept..*/*..conte|
00000100  6e 74 2d 6c 65 6e 67 74  68 00 01 39 00 0c 63 6f  |nt-length..9..co|
00000110  6e 74 65 6e 74 2d 74 79  70 65 00 21 61 70 70 6c  |ntent-type.!appl|
00000120  69 63 61 74 69 6f 6e 2f  78 2d 77 77 77 2d 66 6f  |ication/x-www-fo|
00000130  72 6d 2d 75 72 6c 65 6e  63 6f 64 65 64 00 00 00  |rm-urlencoded...|
00000140  00 00 00 00 00 00 00 00  00 00 12 2f 68 65 6c 6c  |.........../hell|
00000150  6f 3f 6e 61 6d 65 3d 55  73 65 72 2d 32 00 00 00  |o?name=User-2...|
00000160  05 00 04 68 6f 73 74 00  0e 6c 6f 63 61 6c 68 6f  |...host..localho|
00000170  73 74 3a 38 30 38 30 00  0a 75 73 65 72 2d 61 67  |st:8080..user-ag|
00000180  65 6e 74 00 0b 63 75 72  6c 2f 37 2e 34 37 2e 30  |ent..curl/7.47.0|
00000190  00 06 61 63 63 65 70 74  00 03 2a 2f 2a 00 0e 63  |..accept..*/*..c|
000001a0  6f 6e 74 65 6e 74 2d 6c  65 6e 67 74 68 00 01 39  |ontent-length..9|
000001b0  00 0c 63 6f 6e 74 65 6e  74 2d 74 79 70 65 00 21  |..content-type.!|
000001c0  61 70 70 6c 69 63 61 74  69 6f 6e 2f 78 2d 77 77  |application/x-ww|
000001d0  77 2d 66 6f 72 6d 2d 75  72 6c 65 6e 63 6f 64 65  |w-form-urlencode|
000001e0  64 00 00 00 00 00 00 00  00 00 00 00 00           |d............|
000001ed

So far, so good. Before being able to replay recorded requests, we need to remove certain headers such as Host and Content-Length. We can use Distiller for this purpose. We first need to create a transformation script.

/**
 * Distiller transformation script.
 * Removes `Host` and `Content-Length` headers.
 * File is shipped with the source code in `examples/transform.js`.
 */

function sanitizeHeaders(oldHeaders) {
    var newHeaders = [];
    for (var oldHeaderIndex = 0; oldHeaderIndex < oldHeaders.length; oldHeaderIndex++) {
        var oldHeader = oldHeaders[oldHeaderIndex];
        var oldHeaderName = oldHeader.getName();
        var allowed =
            !oldHeaderName.equalsIgnoreCase("host") &&
            !oldHeaderName.equalsIgnoreCase("content-length");
        if (allowed) {
            newHeaders.push(oldHeader);
        }
    }
    return newHeaders;
}

function transform(input) {
    var newHeaders = sanitizeHeaders(input.getHeaders());
    return input.toBuilder().setHeaders(newHeaders).build();
}

Distiller will walk over each recorded request, call transform(input), and persist the emitted output, except when it is null. Distiller uses the default JavaScript engine shipped with Java, which happens to be Rhino for J2SE 6. The provided input parameter within the transform function is of type com.vlkan.hrrs.api.HttpRequestRecord. Hence, you can leverage any method and field available in the Java class.

After saving the above transformation script to /tmp/transform.js, you can use the distiller as follows:

$ java \
  -jar /path/to/hrrs-distiller-base64-<version>.jar \
  -i file:/tmp/hrrs-spring-records-1919023531293728658.csv \
  -o file:/tmp/hrrs-spring-records-1919023531293728658-distilled.csv \
  -s file:/tmp/transform.js
2017-06-16 22:27:18 [ INFO] [main] com.vlkan.hrrs.distiller.cli.Distiller.run:73 - totalRecordCount = 101
2017-06-16 22:27:18 [ INFO] [main] com.vlkan.hrrs.distiller.cli.Distiller.run:75 - ignoredRecordCount = 0 (0.0%)
2017-06-16 22:27:18 [ INFO] [main] com.vlkan.hrrs.distiller.cli.Distiller.run:77 - changedRecordCount = 101 (100.0%)

Let's verify the contents of the distilled records.

$ tail -n 1 /tmp/hrrs-spring-records-1919023531293728658-distilled.csv | awk '{print $5}' | base64 --decode | strings
/hello?name=DistilledUser-100
user-agent
curl/7.47.0
accept
content-type
text/plain
payload-100

Now we can replay the distilled records against the same Spring application we started:

$ java \
  -jar /path/to/hrrs-replayer-base64-<version>.jar \
  -th localhost \
  -tp 8080 \
  -i file:/tmp/hrrs-spring-records-4386205311507695498-distilled.csv
100.0% (durationMillis=10513, recordCount=11)

6/16/17 11:32:49 PM ============================================================

-- Timers ----------------------------------------------------------------------
__all__
             count = 11
         mean rate = 1.06 calls/second
     1-minute rate = 1.00 calls/second
     5-minute rate = 1.00 calls/second
    15-minute rate = 1.00 calls/second
               min = 3.00 milliseconds
               max = 167.00 milliseconds
              mean = 18.99 milliseconds
            stddev = 44.95 milliseconds
            median = 4.00 milliseconds
              75% <= 9.00 milliseconds
              95% <= 167.00 milliseconds
              98% <= 167.00 milliseconds
              99% <= 167.00 milliseconds
            99.9% <= 167.00 milliseconds
__all__.200
             count = 11
         mean rate = 1.07 calls/second
     1-minute rate = 1.00 calls/second
     5-minute rate = 1.00 calls/second
    15-minute rate = 1.00 calls/second
               min = 3.00 milliseconds
               max = 167.00 milliseconds
              mean = 18.99 milliseconds
            stddev = 44.95 milliseconds
            median = 4.00 milliseconds
              75% <= 9.00 milliseconds
              95% <= 167.00 milliseconds
              98% <= 167.00 milliseconds
              99% <= 167.00 milliseconds
            99.9% <= 167.00 milliseconds
hello
             count = 11
         mean rate = 1.07 calls/second
     1-minute rate = 1.00 calls/second
     5-minute rate = 1.00 calls/second
    15-minute rate = 1.00 calls/second
               min = 3.00 milliseconds
               max = 167.00 milliseconds
              mean = 18.99 milliseconds
            stddev = 44.95 milliseconds
            median = 4.00 milliseconds
              75% <= 9.00 milliseconds
              95% <= 167.00 milliseconds
              98% <= 167.00 milliseconds
              99% <= 167.00 milliseconds
            99.9% <= 167.00 milliseconds
hello.200
             count = 11
         mean rate = 1.07 calls/second
     1-minute rate = 1.00 calls/second
     5-minute rate = 1.00 calls/second
    15-minute rate = 1.00 calls/second
               min = 3.00 milliseconds
               max = 167.00 milliseconds
              mean = 18.99 milliseconds
            stddev = 44.95 milliseconds
            median = 4.00 milliseconds
              75% <= 9.00 milliseconds
              95% <= 167.00 milliseconds
              98% <= 167.00 milliseconds
              99% <= 167.00 milliseconds
            99.9% <= 167.00 milliseconds

Replayer is a very versatile command line tool. Pass --help or -h to list all its available options.
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