rules_jsonnet
ursonnet
rules_jsonnet | ursonnet | |
---|---|---|
1 | 1 | |
64 | 5 | |
- | - | |
6.7 | 5.5 | |
about 1 month ago | 6 days ago | |
Starlark | Go | |
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
ursonnet
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Jsonnet – The Data Templating Language
The tool lives in https://github.com/mkmik/ursonnet . I got the basics working but it doesn't work on my larger codebases due to some bug I didn't have yet time hunting down. Having some interest/feedback/help from the community would help making this a reality.
What are some alternatives?
skycfg - Skycfg is an extension library for the Starlark language that adds support for constructing Protocol Buffer messages.
kubectl-neat-diff - De-clutter your kubectl diff output using kubectl-neat
isopod - An expressive DSL and framework for Kubernetes configuration without YAML
github-desktop - A version of GitHub Desktop packaged with Conveyor
aperture - Rate limiting, caching, and request prioritization for modern workloads
kubecfg - A tool for managing complex enterprise Kubernetes environments as code.
nickel - Better configuration for less
cue - The home of the CUE language! Validate and define text-based and dynamic configuration
jsonnet - Jsonnet - The data templating language