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2018-10-13 10:29:59 -07:00
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# Subspace
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2021-01-15 05:30:17 -08:00
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`Subspace` is a prefixed subspace of the parameter store. Each module which uses the
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parameter store will take a `Subspace` to isolate permission to access.
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2019-02-04 18:13:04 -08:00
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## Key
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2020-07-01 06:27:13 -07:00
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Parameter keys are human readable alphanumeric strings. A parameter for the key
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`"ExampleParameter"` is stored under `[]byte("SubspaceName" + "/" + "ExampleParameter")`,
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where `"SubspaceName"` is the name of the subspace.
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Subkeys are secondary parameter keys those are used along with a primary parameter key.
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Subkeys can be used for grouping or dynamic parameter key generation during runtime.
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## KeyTable
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All of the parameter keys that will be used should be registered at the compile
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time. `KeyTable` is essentially a `map[string]attribute`, where the `string` is a parameter key.
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Currently, `attribute` consists of a `reflect.Type`, which indicates the parameter
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type to check that provided key and value are compatible and registered, as well as a function `ValueValidatorFn` to validate values.
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Only primary keys have to be registered on the `KeyTable`. Subkeys inherit the
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attribute of the primary key.
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## ParamSet
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Modules often define parameters as a proto message. The generated struct can implement
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`ParamSet` interface to be used with the following methods:
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* `KeyTable.RegisterParamSet()`: registers all parameters in the struct
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* `Subspace.{Get, Set}ParamSet()`: Get to & Set from the struct
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The implementor should be a pointer in order to use `GetParamSet()`.
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