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Add inspection for missing Optional default values (#797)
If a dev.kord.common.entity.optional.Optional is used in a @serializable class, it should always have a default value so that deserialization works if the value is missing in the JSON. Until now this was easy to forget which could lead to deserialization errors down the line. By introducing a KSP processor that looks at all primary constructor parameters of @serializable classes, there is now a static check executed at build time that verifies the default value is not forgotten in any place.
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52 changes: 52 additions & 0 deletions
52
ksp-processors/src/main/kotlin/inspection/OptionalDefaultInspectionProcessor.kt
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,52 @@ | ||
| package dev.kord.ksp.inspection | ||
|
|
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| import com.google.devtools.ksp.findActualType | ||
| import com.google.devtools.ksp.processing.* | ||
| import com.google.devtools.ksp.symbol.* | ||
| import dev.kord.ksp.getSymbolsWithAnnotation | ||
| import dev.kord.ksp.isClassifierReference | ||
| import kotlinx.serialization.Serializable | ||
|
|
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| /** [SymbolProcessorProvider] for [OptionalDefaultInspectionProcessor]. */ | ||
| class OptionalDefaultInspectionProcessorProvider : SymbolProcessorProvider { | ||
| override fun create(environment: SymbolProcessorEnvironment): SymbolProcessor = | ||
| OptionalDefaultInspectionProcessor(environment.logger) | ||
| } | ||
|
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| private val OPTIONAL_TYPES = | ||
| listOf("Optional", "OptionalBoolean", "OptionalInt", "OptionalLong", "OptionalSnowflake") | ||
| .map { "dev.kord.common.entity.optional.$it" } | ||
| .toSet() | ||
|
|
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| /** | ||
| * [SymbolProcessor] that verifies that every primary constructor parameter with `Optional` type of a [Serializable] | ||
| * class has a default value. | ||
| */ | ||
| private class OptionalDefaultInspectionProcessor(private val logger: KSPLogger) : SymbolProcessor { | ||
| override fun process(resolver: Resolver): List<KSAnnotated> { | ||
| resolver.getSymbolsWithAnnotation<Serializable>() | ||
| .filterIsInstance<KSClassDeclaration>() | ||
| .forEach { it.verifySerializableClassPrimaryConstructor() } | ||
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|
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| return emptyList() // we never have to defer any symbols | ||
| } | ||
|
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| private fun KSClassDeclaration.verifySerializableClassPrimaryConstructor() { | ||
| primaryConstructor?.parameters?.forEach { parameter -> | ||
| if (parameter.hasDefault) return@forEach | ||
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| val type = parameter.type | ||
| if (type.element?.isClassifierReference == false) return@forEach | ||
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| val clazz = when (val declaration = type.resolve().declaration) { | ||
| is KSTypeParameter -> return@forEach | ||
| is KSClassDeclaration -> declaration | ||
| is KSTypeAlias -> declaration.findActualType() | ||
| else -> error("Unexpected KSDeclaration: $declaration") | ||
| } | ||
| if (clazz.qualifiedName?.asString() in OPTIONAL_TYPES) { | ||
| logger.error("Missing default for parameter ${parameter.name?.asString()}.", symbol = parameter) | ||
| } | ||
| } | ||
| } | ||
| } |
1 change: 1 addition & 0 deletions
1
...in/resources/META-INF/services/com.google.devtools.ksp.processing.SymbolProcessorProvider
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1 +1,2 @@ | ||
| dev.kord.ksp.inspection.OptionalDefaultInspectionProcessorProvider | ||
| dev.kord.ksp.kordenum.KordEnumProcessorProvider |
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