undis 0.1.0

serde-compatible redis library
Documentation 
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use paste::paste;
use serde::ser;

/// Wrapper to ensure to serialize only map-like formats.
///
/// If the `T` is serialized into map-like format(e.g. HashMap or struct with named fields),
/// `EnsureMapLike(T)` is a no-op wrapper on serialization.
/// Otherwise it fails to be serialized and returns error.
#[derive(Debug)]
pub struct EnsureMapLike<T>(pub T);

#[derive(Debug)]
struct EnsureMapLikeSerializer<S>(S);

impl<T: ser::Serialize> ser::Serialize for EnsureMapLike<T> {
    fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
    where
        S: serde::Serializer,
    {
        self.0.serialize(EnsureMapLikeSerializer(serializer))
    }
}

macro_rules! impl_scalar_types_not_supported {
    ($($target:ident)*) => {paste!{$(
        fn [<serialize_ $target>](self, _v: $target) -> Result<Self::Ok, Self::Error> {
            Err(ser::Error::custom("scalar types are not supported"))
        }
    )*}};
}

impl<S: ser::Serializer> ser::Serializer for EnsureMapLikeSerializer<S> {
    type Ok = S::Ok;
    type Error = S::Error;
    type SerializeSeq = ser::Impossible<S::Ok, S::Error>;
    type SerializeTuple = ser::Impossible<S::Ok, S::Error>;
    type SerializeTupleStruct = ser::Impossible<S::Ok, S::Error>;
    type SerializeTupleVariant = ser::Impossible<S::Ok, S::Error>;
    type SerializeMap = S::SerializeMap;
    type SerializeStruct = S::SerializeStruct;
    type SerializeStructVariant = ser::Impossible<S::Ok, S::Error>;

    impl_scalar_types_not_supported!(bool i8 i16 i32 i64 u8 u16 u32 u64 f32 f64 char);

    fn serialize_str(self, _v: &str) -> Result<Self::Ok, Self::Error> {
        Err(ser::Error::custom("scalar types are not supported"))
    }

    fn serialize_bytes(self, _v: &[u8]) -> Result<Self::Ok, Self::Error> {
        Err(ser::Error::custom("scalar types are not supported"))
    }

    fn serialize_none(self) -> Result<Self::Ok, Self::Error> {
        Err(ser::Error::custom("optional types are not supported"))
    }

    fn serialize_some<T: ?Sized>(self, _value: &T) -> Result<Self::Ok, Self::Error>
    where
        T: serde::Serialize,
    {
        Err(ser::Error::custom("optional types are not supported"))
    }

    fn serialize_unit(self) -> Result<Self::Ok, Self::Error> {
        Err(ser::Error::custom("unit types are not supported"))
    }

    fn serialize_unit_struct(self, _name: &'static str) -> Result<Self::Ok, Self::Error> {
        Err(ser::Error::custom("unit types are not supported"))
    }

    fn serialize_unit_variant(
        self,
        _name: &'static str,
        _variant_index: u32,
        _variant: &'static str,
    ) -> Result<Self::Ok, Self::Error> {
        Err(ser::Error::custom("unit types are not supported"))
    }

    fn serialize_newtype_struct<T: ?Sized>(
        self,
        _name: &'static str,
        value: &T,
    ) -> Result<Self::Ok, Self::Error>
    where
        T: serde::Serialize,
    {
        value.serialize(self)
    }

    fn serialize_newtype_variant<T: ?Sized>(
        self,
        _name: &'static str,
        _variant_index: u32,
        _variant: &'static str,
        _value: &T,
    ) -> Result<Self::Ok, Self::Error>
    where
        T: serde::Serialize,
    {
        Err(ser::Error::custom("variant types are not supported"))
    }

    fn serialize_seq(self, _len: Option<usize>) -> Result<Self::SerializeSeq, Self::Error> {
        Err(ser::Error::custom("sequence types are not supported"))
    }

    fn serialize_tuple(self, _len: usize) -> Result<Self::SerializeTuple, Self::Error> {
        Err(ser::Error::custom("sequence types are not supported"))
    }

    fn serialize_tuple_struct(
        self,
        _name: &'static str,
        _len: usize,
    ) -> Result<Self::SerializeTupleStruct, Self::Error> {
        Err(ser::Error::custom("sequence types are not supported"))
    }

    fn serialize_tuple_variant(
        self,
        _name: &'static str,
        _variant_index: u32,
        _variant: &'static str,
        _len: usize,
    ) -> Result<Self::SerializeTupleVariant, Self::Error> {
        Err(ser::Error::custom("variant types are not supported"))
    }

    fn serialize_map(self, len: Option<usize>) -> Result<Self::SerializeMap, Self::Error> {
        self.0.serialize_map(len)
    }

    fn serialize_struct(
        self,
        name: &'static str,
        len: usize,
    ) -> Result<Self::SerializeStruct, Self::Error> {
        self.0.serialize_struct(name, len)
    }

    fn serialize_struct_variant(
        self,
        _name: &'static str,
        _variant_index: u32,
        _variant: &'static str,
        _len: usize,
    ) -> Result<Self::SerializeStructVariant, Self::Error> {
        Err(ser::Error::custom("variant types are not supported"))
    }
}