英文:
Go build command throws - panic: interface conversion: interface {} is []uint8, not *validator.FieldValidator
问题
在下面的Go函数中，当我尝试运行构建命令以生成pb.go文件时，出现错误。
panic: 接口转换: interface {} 是 []uint8，而不是 *validator.FieldValidator
github.com/mygithub/myproject/plugin.getFieldValidatorIfAny(0xc0001d4b60, 0x5b5020)
有什么建议可以解决这个问题吗？
func getFieldValidatorIfAny(field *descriptor.FieldDescriptorProto) *validator.FieldValidator {
if field.Options != nil {
v, err := proto.GetExtension(field.Options, validator.E_Field)
if err == nil && v.(*validator.FieldValidator) != nil {
return (v.(*validator.FieldValidator))
}
}
return nil
}
我正在尝试使用 https://github.com/mwitkow/go-proto-validators 添加验证。
英文:
In below Go function I am getting error when I tried to run build command to generate pb.go file.
panic: interface conversion: interface {} is []uint8, not *validator.FieldValidator
github.com/mygithub/myproject/plugin.getFieldValidatorIfAny(0xc0001d4b60, 0x5b5020)
Any suggestion on how to resolve this
func getFieldValidatorIfAny(field *descriptor.FieldDescriptorProto) *validator.FieldValidator {
if field.Options != nil {
v, err := proto.GetExtension(field.Options, validator.E_Field)
if err == nil && v.(*validator.FieldValidator) != nil {
return (v.(*validator.FieldValidator))
}
}
return nil
}
I am trying to add validation using from https://github.com/mwitkow/go-proto-validators
答案1
得分: 1
根据 https://beta.pkg.go.dev/github.com/golang/protobuf/proto#GetExtension（我强调）：
如果描述符是完整类型（即ExtensionDesc.ExtensionType非nil），则GetExtension解析编码字段并返回指定类型的Go值。如果字段不存在，则返回默认值（如果指定了默认值），否则报告ErrMissingExtension。
如果描述符是不完整类型（即ExtensionDesc.ExtensionType为nil），则GetExtension返回扩展字段的原始编码字节。
因此，这里看起来validator.E_Field是“不完整类型”。您可能需要添加对定义扩展的包的依赖，以便其类型将被注册 - 可能通过使用import _ "example.com/some/proto"将其链接到您的二进制文件中。
英文:
Per https://beta.pkg.go.dev/github.com/golang/protobuf/proto#GetExtension (emphasis mine):
> If the descriptor is type complete (i.e., ExtensionDesc.ExtensionType is non-nil), then GetExtension parses the encoded field and returns a Go value of the specified type. If the field is not present, then the default value is returned (if one is specified), otherwise ErrMissingExtension is reported.
>
> If the descriptor is type incomplete (i.e., ExtensionDesc.ExtensionType is nil), then GetExtension returns the raw encoded bytes for the extension field.
So, here it appears that validator.E_Field is “type incomplete”. You may need to add a dependency on the package that defines the extension so that its type will be registered — perhaps by using import _ "example.com/some/proto" to link it in to your binary.
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