# kffl/speedbump

TCP proxy for simulating variable, yet predictable network latency :globe_with_meridians::hourglass_flowing_sand:

Repository: https://github.com/kffl/speedbump
Canonical: https://ross.abutalabs.com/products/speedbump
Language: Go
License: Apache-2.0
License Family: permissive
Topics: go, golang, load-testing, network-latency, tcp, tcp-proxy, observability
Last push: 2024-07-25T10:32:01+00:00

## Health v2 (maintenance only)
Score: 23/100 (v2, computed 2026-09-02T17:46:02.011165+00:00)
- activity 0, release rhythm 8, longevity 100
- inputs: {"age_days": 1538, "days_push": 769, "days_rel": null, "gap_med": null, "n_releases_24m": 0}
- flags: none
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 1559, forks 36 (observed 2026-08-28T04:05:03.623655+00:00)

## What it is
Speedbump is a TCP proxy written in Go that simulates variable, predictable network latency using configurable sine and sawtooth wave summands. It ships as pre-built binaries and a Docker image, making it easy to inject realistic latency into local or test environments.

## Use cases
- simulate network latency for a TCP service during load testing
- test how an application behaves under fluctuating connection delays
- add predictable latency between a client and a database or API in integration tests
- emulate degraded network conditions locally with sine or sawtooth latency patterns
- run a latency-injecting TCP proxy in a Docker container for chaos engineering

## When to choose
- you need TCP-level latency injection with deterministic, wave-shaped delay patterns
- you want a lightweight, single-binary or containerized proxy for testing
- you are doing load or chaos testing and need reproducible network conditions

## When to avoid
- you need HTTP-aware proxying, request modification, or TLS termination
- you need to simulate packet loss, jitter, or bandwidth throttling rather than latency
- you need production traffic proxying rather than a testing tool

## Facets
- artifact type: cli-tool
- maturity: active
- function: proxy, load-testing, networking, developer-tools, cli
- domain: developer-tools, networking, testing, performance
- platform: windows, go, cli
- tags: tcp-proxy, latency-simulation, chaos-testing, network-emulation, golang, command-line, linux, macos, docker

## Member repositories
- kffl/speedbump (main) score 23

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:05:03.623655+00:00.
- Health v2: computed from the inputs above; adoption is never an input.
- Inferred fields (summary, facets, guidance): AI-extracted, prompt v1, taxonomy v1, on 2026-08-30T04:29:50.812498+00:00, confidence not recorded.
  - readme: https://github.com/kffl/speedbump (fetched 2026-08-28T04:05:03.623655+00:00, sha cd85c4e60ae0)
- Data as of 2026-08-30T08:39:29.467469+00:00.