ISISComputingGroup/saluki

`howl`: stream some sample environment

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#66 opened on Apr 13, 2026

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good first issue

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Description

I would like howl to basically fake an entire run, which will include sample environment data.

for this to work, start with 1 PV with streaming a sine wave (basically 0-10-0 on a loop) and it'd be nice to test a few different datatypes for this

this also needs a placeholder for each PV in the run start with type f144 like this one for ev44: https://github.com/ISISComputingGroup/saluki/blob/main/src/howl.rs#L48 so that a downstream consumer such as a filewriter can write this information. Docs for this here: https://github.com/ess-dmsc/kafka-to-nexus/blob/main/documentation/commands.md#data-streams-alt-writer-modules

Contributor guide

Research direction
Study the existing code in `howl` and the referenced file `src/howl.rs` to understand how data streams are handled, then implement a sine wave generator for a sample PV and placeholders for data types like `ev44` and `f144`.
Tech stack
rust
Domain
backenddata
Issue type
Feature
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
3
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
1-3 hours
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
Active
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
Clear
Prerequisites
RustKafkaFlatBuffers
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
70