GitHub - JeremyLoy/config: 12 factor configuration as a typesafe struct in as li...
source link: https://github.com/JeremyLoy/config
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README.md
Config
Manage your application config as a typesafe struct in as little as two function calls.
type MyConfig struct { DatabaseUrl string Port int FeatureFlag bool ... } var c MyConfig config.FromEnv().To(&c)
How It Works
Its just simple, pure stdlib.
- A field's type determines what strconv function is called.
- All string conversion rules are as defined in the strconv package
- If chaining multiple data sources, data sets are merged.
Later values override previous values.
- e.g.
config.From("dev.config").FromEnv().To(&c)
- e.g.
- Unset values remain as their native zero value
- Nested structs/subconfigs are delimited with double underscore
- e.g.
PARENT__CHILD
- e.g.
- Env vars map to struct fields case insensitively
Why you should use this
- Its the cloud-native way to manage config. See 12 Factor Apps
- Simple:
- only 2 lines to configure.
- Composeable:
- Merge local files and environment variables for effortless local development.
- small:
- only stdlib
- < 160 LoC
Design Philosophy.
Opinionated and narrow in scope. This library is only meant to do config binding. Feel free to use it on its own, or alongside other libraries.
-
Only structs at the entry point. This keeps the API surface small.
-
Slices are space delimited. This matches how environment variables and commandline args are handled by the
go
cmd. -
No slices of structs. The extra complexity isn't warranted for such a niche usecase.
-
No maps. The only feature of maps not handled by structs for this usecase is dynamic keys.
-
No pointer members. If you really need one, just take the address of parts of your struct.
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