skycfg
ron
skycfg | ron | |
---|---|---|
6 | 24 | |
634 | 3,128 | |
0.5% | 1.6% | |
3.9 | 7.6 | |
about 1 month ago | 22 days ago | |
Go | Rust | |
Apache License 2.0 | Apache License 2.0 |
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skycfg
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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
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The Dhall Configuration Language
Can you say more about what GCL does better than all of the open source ones?
Anecdotally, I've heard a lot of GCL horror stories, and many Xooglers have chosen to create things like Jsonnet or Skycfg (https://github.com/stripe/skycfg) instead.
- YAML: It's Time to Move On
- Opinion-driven design
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Migrating Millions of Concurrent WebSockets to Envoy
If you’re looking at other solutions check out https://github.com/stripe/skycfg It works with Envoy and lots of other things that support protobuf configs
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Yaml Is The Worst Thing Ever Created K8s Should
This is good and there are several other options like https://github.com/stripe/skycfg#why-use-skycfg to add full language support (using Go or python for ex) to configurations.
ron
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XML is better than YAML
Whenever this kind of arguments come up, I am sad that RON (https://github.com/ron-rs/ron) is not better known. To me it feels like a cleaner and better JSON.
In any case, my little experience with it had made me hate YAML. Generally speaking, I have come to dislike any language with significant whitespace other than Haskell.
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What config format do you prefer?
Part of the reason why I migrated away from RON in system76-scheduler is because I needed to rely on the 253-untagged-enums branch from https://github.com/MomoLangenstein/ron. Which still isn't resolved today: https://github.com/ron-rs/ron/pull/451.
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Ron: Rusty Object Notation
Serde is strongly, strictly typed: you have to specify what type you want to decode to. It’s nothing like Python’s Pickle protocol.
See, for example, https://github.com/ron-rs/ron/blob/484fcab0686dfd18c7e29b6c1..., where it (in a type-inferency way) says “parse as Config”.
- JSON vs. XML with Douglas Crockford
- Ron – Rusty Object Notation
- They're rebuilding the Death Star of complexity
What are some alternatives?
jsonnet - Jsonnet - The data templating language
toml.io - Source Code for toml.io
isopod - An expressive DSL and framework for Kubernetes configuration without YAML
json5 - JSON5 — JSON for Humans
nestedtext - Human readable and writable data interchange format
kdl - the kdl document language specifications
rules_jsonnet - Jsonnet rules for Bazel
minimal-yaml - A minimalist, zero-copy parser for a strict subset of the Yaml specification.
starlark - Starlark Language
yaml-reference-parser
kubernetes-mixin - A set of Grafana dashboards and Prometheus alerts for Kubernetes.
typescript-json-schema - Generate json-schema from your Typescript sources