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https://github.com/didi/rdebug

Rdebug — Real Debugger
https://github.com/didi/rdebug

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Rdebug — Real Debugger

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README 

        
RDebug - Real Debugger



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## Translation



- [中文](./README_zh_CN.md)



## 1. Introduction



Rdebug is an open source *tool chain* that focusing on efficiency of daily developing, testing and debugging for developers. The code will be robust.



### 1.1 Background



As micro-service architecture makes services *isomerous*, *easy-to-deploy* and *superbly extensible*, large systems are divided into several micro services.



But, micro-service architecture is not a silver bullet. It has several drawbacks. One service is divided into several small services, test environment becomes hard to maintain. Unit test needs to mock downstream services. This will downgrade the efficiency of developing, and increase production bugs.



We do believe this industry needs an evolution.



### 1.2 Principle



Efficiency improvement, release cycle reduction, code quality improvement, production bug reduction



### 1.3 When to use



Suitable for old api refactoring that traffic have already been recorded.



Not suitable for new api or api that has no traffic recorded.



Support for new api is under investigation.



## 2. Quick Started



### Traffic Recording



```shell

# Modify php-fpm config, set `clear_env = no`



# Compile koala-libc.so & koala-recorder.so



# Start php-fpm with koala-libc.so & koala-recorder.so

# Set environment first

$ export KOALA_SO=/path/to/koala-recorder.so 

$ export KOALA_RECORD_TO_DIR=/path/to/your-save-recorded-session-dir

$ export LC_CTYPE="C"



# Recording

# macOS

$ DYLD_INSERT_LIBRARIES="/path/to/koala-libc.so" DYLD_FORCE_FLAT_NAMESPACE="y" /path/to/sbin/php-fpm



# or, Linux

$ LD_PRELOAD="/path/to/koala-libc.so" /path/to/sbin/php-fpm

```



### Traffic Replaying



Three ways to replay: replay from source, replay by midi.phar, replay by composer vendor/bin.



```shell

# Source

$ git clone https://github.com/didi/rdebug.git

$ cd rdebug/php/midi

$ sh install.sh

$ cd /path/to/your/project

$ /path/to/rdebug/php/midi/bin/midi run -f RECORD-SESSION-FILE



# Or, Phar

$ wget -O midi.phar -q https://github.com/didi/rdebug/raw/master/output/bin/midi.phar

$ midi.phar run -f RECORD-SESSION-FILE



# Or, Composer global

$ composer global require rdebug/midi

$ cd /path/to/your/project

$ ~/.composer/vendor/bin/midi run -f RECORD-SESSION-FILE



# Or, Composer

$ cd /path/to/your/project

$ composer require rdebug/midi --dev

$ ./vendor/bin/midi run -f RECORD-SESSION-FILE

```



### PHP Example



- [Try Record & Replay With Docker](./doc/Docker.md)

- [PHP Record & Replay Example](./example/php/README.md)

- [Replay Local File](./doc/midi/Replay-file.md)



## 3. Technical Details



We are using real production traffic to test on non-production environment. So, the core features of `Rdebug` are traffic recording and traffic replaying.



* **Traffic Recording**



  Recording production traffic, including RPC between micro-services. The most difficult part is to trace requests that will span multiple services.



* **Traffic Replaying**



  Replaying recorded production traffic against non-production environment, mock downstream traffic based on traffic matching. The most difficult part is interception and traffic matching.



![koala-midi](./doc/images/koala-midi_en-US.png)



### 3.1 Koala & Koala-libc



Koala and Koala-libc is the engine of Rdebug.



Because the problems such as *RPC tracing*, *libc interception* that a traffic replaying system may concern is what a traffic recording system concerns. The traffic recording and replaying system shares the same engine.



#### Koala



Koala is written in Go, libc contains some c++ code for interception part which will complied to *koala-recorder.so* and *koala-replayer.so*



Koala support replaying and recording separately as well as simultaneously.



For more details: [koala](./koala/README.md) 。



#### Koala-libc



koala-libc is written in C, and compiled to *koala-libc.so*



Go does not support `fork`. To avoid problems bring by PHP-FPM fork worker, you need to inject *koala-libc.so* into parent process of PHP. So that *koala-libc.so* will forward requests libc intercepted to *koala-recorder.so when `accept` in child process



For more details: [koala-libc](./koala-libc/README.md) 。



### 3.2 Midi



Midi is a traffic replay client for PHP using command line written in PHP.



*koala-replayer.so* is embedded in Midi, and it can replay production traffic against new code, analyze test result, generate diff report, trace report, coverage report.



Midi support Xdebug.



For more details: [midi](./php/midi/README.md) 。



## 4. Compile



### 4.1 Requirement



#### Koala & Koala-libc



- GCC >= 4.8

- Go >= 1.8

- Glide



#### Midi



- macOS/Linux

- PHP >= 7.0

- Xdebug (Optional)

- Composer (Optional)



### 4.2 Compile Koala-libc



```shell

$ cd koala-libc

$ sh build.sh

```



will generate `../output/libs/koala-libc.so`。



### 4.3 Compile Koala



```shell

$ cd koala



# install depends

$ sh build.sh vendor



# koala-recorder.so

$ sh build.sh recorder



# koala-replayer.so

$ sh build.sh

```



will generate `../output/libs/koala-recorder.so` and `../output/libs/koala-replayer.so`。



### 4.4 Compile midi.phar



Before compile midi.pahr, recommend compile `koala-replayer.so` at your system and store in `php/midi/res/replayer` directory.



`php/midi/res/replayer/koala-replayer.so` in repository is for macOS.



```shell

$ cd php/midi

$ sh build.sh

```



will generate `../output/bin/midi.phar`



Default phar will not include `DiPlugin` plugin, which is an internal plugin of didi.



If your want to compile with `DiPlugin` plugin:



```

$ cd php/midi

$ sh build.sh midi-diplugin

```



## 5. Usage



### 5.1 Traffic Recording



Record traffic in file or Elastic.



Set environment variable `KOALA_RECORD_TO_DIR` to save record to specified dir



Inject so. Use `DYLD_INSERT_LIBRARIES` in macOs or `LD_PRELOAD` in Linux



For more details: [Recorder](./doc/recorder/recorder.md)。



#### 5.1.1 macOS Recording



```shell

$ DYLD_INSERT_LIBRARIES="/path/to/koala-libc.so:/usr/lib/libcurl.dylib" DYLD_FORCE_FLAT_NAMESPACE="y" LC_CTYPE="C" KOALA_SO=/path/to/koala-recorder.so KOALA_RECORD_TO_DIR=/tmp /usr/local/sbin/php-fpm

```



#### 5.1.2 Linux Recording



```shell

LD_PRELOAD="/path/to/koala-libc.so /usr/lib64/libcurl.so.4" LC_CTYPE="C" KOALA_SO="/path/to/koala-recorder.so" KOALA_RECORD_TO_DIR=/tmp /usr/local/sbin/php-fpm

```



Koala support writing to Elastic by replacing `KOALA_RECORD_TO_DIR` with `KOALA_RECORD_TO_ES` which value is elastic write url



### 5.2 Traffic Replay



Traffic replaying is to replay recorded traffic in production against non-production environment. You need only to deploy your code w/o deploying downstream services.



Below is a simple example of replaying with '-f', which specified the file to replay.



#### 5.2.1 Replay



```Shell

# Source

$ /path/to/rdebug/php/midi/bin/midi run -f RECORD-SESSION-FILE



# Or, phar

$ midi.phar run -f RECORD-SESSION-FILE



# Or, composer vendor bin

$ ./vendor/bin/midi -f RECORD-SESSION-FILE

```



For more details: [Replay](#traffic-replaying)



Use -v, -vv or -vvv for more verbose log.



#### 5.2.2 Report



Use `-R`，`-T`，`-C` to generate：Replay report, Trace report, Coverage report



![report](./example/php/report.png)



![report-upstream](./example/php/report-upstream.png)



![report-coverage](./example/php/report-coverage.png)



For more details: [Midi](./php/midi/README.md)。



## 6. More



### 6.1 Translation



* [中文](./README_zh_CN.md)



### 6.2 Documentation



* [Documentation](./doc/DocList.md)

* [Wiki](https://github.com/didi/rdebug/wiki)



### 6.3 Contribute



Any contributions are welcome. [More Details](./CONTRIBUTING.md)



### 6.4 Contract



- Add Weixin






- QQ Group

    

![QQ](doc/images/QQChat.png)



### 6.5 License



Rdebug is licensed under the Apache 2.0 License. [LICENSE](./LICENSE)



### 6.6 Contributors



Special thanks to [TaoWen](https://github.com/taowen) Developer of Koala & Koala-libc.



Thanks to all the people who [contribute](https://github.com/didi/rdebug/graphs/contributors).