Intermediate HCL: Configuration Languages in HCL2
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Using examples and demos, this talk will walk through leveling up HCL knowledge from level 2 to level 7. You'll see examples of using functions, variables, and polymorphism to work through a "configuration DSL" built using HCL. The example will be fun and simple, but the techniques should be generalizable to a lot of problems.
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Intermediate HCL: Configuration Languages in HCL2
- 3. Intermediate HCL Configuration Languages in HCL2 Russell Rollins Release Engineer at HashiCorp russell@hashicorp.com | @russell_rollins Copyright © 2019 HashiCorp
- 4. CODE EDITOR project = "example-project" deploy_id = env.BUILD_ID artifact { artifact_type = "quay_repo" config { repo = project.name tag = project.deploy_id } }
- 5. Domain Specific Configuration Language YAML ▪ Schemaless ▪ Variables loosely supported using anchors or an external templating engine. ▪ Functions loosely supported using an external templating engine. HCL ▪ Shemaful? Schema-having? It has a schema. ▪ Variables supported as a first class citizen. ▪ Functions supported as a first class citizen.
- 6. An Analogy In language, people in certain fields or social groups use jargon, slang, or argot. These are less general than normal language, but can be used to densely pack information using shared context.
- 7. Concretely, Creating DSCLs Variables Variables allow dynamism in configuration. For instance, reading from the environment or another file. 12 Factor HCL. We’ll use this to support env.CAT_SOUND Functions Functions create even more powerful and flexible configurations. Combine with string interpolation to build complex configuration. We’ll use this to build random() Partial Decoding + Polymorphism Partial Decoding is a concept in HCL that allows it to be “self referential” where decoding decisions can be made based on other configuration. We’ll use this to support type = “cat” and type = “dog”
- 8. Demo If I have listen to myself ramble on anymore I’m going to get bored.
- 9. Call to Action Go convert some services to consume HCL for configuration, you’ll learn more about your tool’s domain and about HCL.