base on TCP proxy for simulating variable, yet predictable network latency :globe_with_meridians::hourglass_flowing_sand: # speedbump - TCP proxy with variable latency <div align="center"> <img alt="speedbump logo" src="https://github.com/kffl/speedbump/raw/HEAD/assets/speedbump.gif" width="480" height="auto"/> </div> Speedbump is a TCP proxy written in Go which allows for simulating variable network latency. [](https://github.com/kffl/speedbump/actions) [](https://goreportcard.com/report/github.com/kffl/speedbump) [](https://hub.docker.com/r/kffl/speedbump) [](https://hub.docker.com/r/kffl/speedbump) [](https://godoc.org/github.com/kffl/speedbump/lib) ## Usage ### Installation The easiest way to install speedbump is to download pre-built binaries for your platform that are automatically attached to each [release](https://github.com/kffl/speedbump/releases/) under _Assets_. If you wish to build speedbump from source, clone this repository and run `go build`. Alternatively, you can run speedbump as a container using the [kffl/speedbump](https://hub.docker.com/r/kffl/speedbump) image. ### Basic usage examples Spawn a new instance listening on port 2000 that proxies TCP traffic to localhost:80 with a base latency of 100ms and sine wave amplitude of 100ms (resulting in maximum added latency being 200ms and minimum being 0), period of which is 1 minute: ``` speedbump --latency=100ms --sine-amplitude=100ms --sine-period=1m --port=2000 localhost:80 ``` or when running speedbump using the [kffl/speedbump](https://hub.docker.com/r/kffl/speedbump) container image: ``` docker run --net=host kffl/speedbump:latest --latency=100ms --sine-amplitude=100ms \ --sine-period=1m --port=2000 localhost:80 ``` Spawn a new instance with a base latency of 300ms and a sawtooth wave latency summand with amplitude of 200ms and period of 2 minutes (visualized by the graph below): ``` speedbump --latency=300ms --saw-amplitude=200ms --saw-period=2m --port=2000 localhost:80 ``` <div align="center"> <img alt="speedbump sawtooth wave graph" src="https://github.com/kffl/speedbump/raw/HEAD/assets/sawtooth.svg" width="800" height="auto"/> </div> ### Combining latency summands It is possible to run speedbump with multiple latency summands at once: <div align="center"> <img alt="speedbump sawtooth + sine graph" src="https://github.com/kffl/speedbump/raw/HEAD/assets/combined.svg" width="800" height="auto"/> </div> ## CLI Arguments Reference: Output of `speedbump --help`: ``` usage: speedbump [<flags>] <destination> TCP proxy for simulating variable network latency. Flags: --help Show context-sensitive help (also try --help-long and --help-man). --host="" IP or hostname to listen on. Speedbump will bind to all available network interfaces if unspecified. --port=8000 Port number to listen on. --buffer=64KB Size of the buffer used for TCP reads. --queue-size=1024 Size of the delay queue storing read buffers. --latency=5ms Base latency added to proxied traffic. --log-level=INFO Log level. Possible values: DEBUG, TRACE, INFO, WARN, ERROR. --sine-amplitude=0 Amplitude of the latency sine wave. --sine-period=0 Period of the latency sine wave. --saw-amplitude=0 Amplitude of the latency sawtooth wave. --saw-period=0 Period of the latency sawtooth wave. --square-amplitude=0 Amplitude of the latency square wave. --square-period=0 Period of the latency square wave. --triangle-amplitude=0 Amplitude of the latency triangle wave. --triangle-period=0 Period of the latency triangle wave. --version Show application version. Args: <destination> TCP proxy destination in host:post format. ``` ## Using speedbump as a library Speedbump can be used as a Go library via its `lib` package. Check `lib` [README](lib/README.md) for additional information. ## License Copyright Paweł Kuffel 2022, licensed under Apache 2.0 License. Speedbump logo contains the Go Gopher mascot which was originally designed by Renee French (http://reneefrench.blogspot.com/) and licensed under Creative Commons 3.0 Attributions license. ", Assign "at most 3 tags" to the expected json: {"id":"7015","tags":[]} "only from the tags list I provide: [{"id":77,"name":"3d"},{"id":89,"name":"agent"},{"id":17,"name":"ai"},{"id":54,"name":"algorithm"},{"id":24,"name":"api"},{"id":44,"name":"authentication"},{"id":3,"name":"aws"},{"id":27,"name":"backend"},{"id":60,"name":"benchmark"},{"id":72,"name":"best-practices"},{"id":39,"name":"bitcoin"},{"id":37,"name":"blockchain"},{"id":1,"name":"blog"},{"id":45,"name":"bundler"},{"id":58,"name":"cache"},{"id":21,"name":"chat"},{"id":49,"name":"cicd"},{"id":4,"name":"cli"},{"id":64,"name":"cloud-native"},{"id":48,"name":"cms"},{"id":61,"name":"compiler"},{"id":68,"name":"containerization"},{"id":92,"name":"crm"},{"id":34,"name":"data"},{"id":47,"name":"database"},{"id":8,"name":"declarative-gui "},{"id":9,"name":"deploy-tool"},{"id":53,"name":"desktop-app"},{"id":6,"name":"dev-exp-lib"},{"id":59,"name":"dev-tool"},{"id":13,"name":"ecommerce"},{"id":26,"name":"editor"},{"id":66,"name":"emulator"},{"id":62,"name":"filesystem"},{"id":80,"name":"finance"},{"id":15,"name":"firmware"},{"id":73,"name":"for-fun"},{"id":2,"name":"framework"},{"id":11,"name":"frontend"},{"id":22,"name":"game"},{"id":81,"name":"game-engine "},{"id":23,"name":"graphql"},{"id":84,"name":"gui"},{"id":91,"name":"http"},{"id":5,"name":"http-client"},{"id":51,"name":"iac"},{"id":30,"name":"ide"},{"id":78,"name":"iot"},{"id":40,"name":"json"},{"id":83,"name":"julian"},{"id":38,"name":"k8s"},{"id":31,"name":"language"},{"id":10,"name":"learning-resource"},{"id":33,"name":"lib"},{"id":41,"name":"linter"},{"id":28,"name":"lms"},{"id":16,"name":"logging"},{"id":76,"name":"low-code"},{"id":90,"name":"message-queue"},{"id":42,"name":"mobile-app"},{"id":18,"name":"monitoring"},{"id":36,"name":"networking"},{"id":7,"name":"node-version"},{"id":55,"name":"nosql"},{"id":57,"name":"observability"},{"id":46,"name":"orm"},{"id":52,"name":"os"},{"id":14,"name":"parser"},{"id":74,"name":"react"},{"id":82,"name":"real-time"},{"id":56,"name":"robot"},{"id":65,"name":"runtime"},{"id":32,"name":"sdk"},{"id":71,"name":"search"},{"id":63,"name":"secrets"},{"id":25,"name":"security"},{"id":85,"name":"server"},{"id":86,"name":"serverless"},{"id":70,"name":"storage"},{"id":75,"name":"system-design"},{"id":79,"name":"terminal"},{"id":29,"name":"testing"},{"id":12,"name":"ui"},{"id":50,"name":"ux"},{"id":88,"name":"video"},{"id":20,"name":"web-app"},{"id":35,"name":"web-server"},{"id":43,"name":"webassembly"},{"id":69,"name":"workflow"},{"id":87,"name":"yaml"}]" returns me the "expected json"