rules_jsonnet
kubecfg
rules_jsonnet | kubecfg | |
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1 | 6 | |
64 | 193 | |
- | 1.0% | |
6.7 | 9.1 | |
about 1 month ago | 6 days ago | |
Starlark | Go | |
Apache License 2.0 | Apache License 2.0 |
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rules_jsonnet
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Jsonnet – The Data Templating Language
I can definitely sympathize here - in every context, just straight JSON/YAML configuration seems never expressive enough, but the tooling created in response always seems to come with sharp edges.
Here are some of the things I appreciate about Jsonnet:
- It evals to JSON, so even though the semantics of the language are confusing, it is reasonably easy to eval and iterate on some Jsonnet until it emits what one is expecting - and after that, it's easy to create some validation tests so that regressions don't occur.
- It takes advantage of the fact that JSON is a lowest-common-denominator for many data serialization formats. YAML is technically a superset of JSON, so valid JSON is also valid YAML. Proto3 messages have a canonical JSON representation, so JSON can also adhere to protobuf schemas. This covers most "serialized data structure" use-cases I typically encounter (TOML and HCL are outliers, but many tools that accept those also accept equivalent JSON). This means that with a little bit of build-tool duct-taping, Jsonnet can be used to generate configurations for a wide variety of tooling.
- Jsonnet is itself a superset of JSON - so those more willing to write verbose JSON than learn Jsonnet can still write JSON that someone else can import/use elsewhere. Using Jsonnet does not preclude falling back to JSON.
- The tooling works well - installing the Jsonnet VSCode plugin brings in a code formatter that does an excellent job, and rules_jsonnet[0] provides good bazel integration, if that's your thing.
I'm excited about Jsonnet because now as long as other tool authors decide to consume JSON, I can more easily abstract away their verbosity without writing a purpose-built tool (looking at you, Kubernetes) without resorting to text templating (ahem Helm). Jsonnet might just be my "one JSON-generation language to rule them all"!
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Though if Starlark is your thing, do checkout out skycfg[1]
[0] - https://github.com/bazelbuild/rules_jsonnet
[1] - https://github.com/stripe/skycfg
kubecfg
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Jsonnet – The Data Templating Language
kubecfg does add some features, like https:// imports, oci:// imports (oci bundles in OCI registries, transitively bundling all imported files with jsonnet-deps).
But yes, I strive to keep the "one file, one target, import whatever you need but explicitly" as much as possible.
I'm pouring some more time into the project and trying to implement some ideas I had for a long time but never managed to get them out. For example "Flags From Files" (https://github.com/kubecfg/kubecfg/blob/flagspec/docs/rfcs/r...) or "Caching + optional vendoring of immutable external deps".
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Correcting ChatGPT on YAML file syntax
You shouldn't write those manifests by hand in any non-hobby project. https://github.com/kubecfg/kubecfg
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Your thought on frameworks that uses/relying on ksonnet/ksonnet-lib?
Should kubecfg be used instead (having active development)?
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Why should I make a helm chart for my app if I use ArgoCD?
We use kubecfg and it is what I would recommend to anyone looking to create a sustainable GitOps workflow at work.
- Falling for Kubernetes
What are some alternatives?
skycfg - Skycfg is an extension library for the Starlark language that adds support for constructing Protocol Buffer messages.
isopod - An expressive DSL and framework for Kubernetes configuration without YAML
grafonnet-lib - Jsonnet library for generating Grafana dashboard files.
ursonnet - experimental ur-cause tracer for jsonnet
sprig - Useful template functions for Go templates.
aperture - Rate limiting, caching, and request prioritization for modern workloads
github-desktop - A version of GitHub Desktop packaged with Conveyor
nickel - Better configuration for less
cue - The home of the CUE language! Validate and define text-based and dynamic configuration
stolon - PostgreSQL cloud native High Availability and more.