apollo-configuration 0.4.0

A typed, friendly configuration system for Apollo products.
Documentation 
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//! Support for gRPC types in configuration.

use std::borrow::Cow;

use derive_more::{Deref, Display, From};
use schemars::JsonSchema;
use serde::de::Deserializer;
use serde::{Deserialize, Serialize};

use crate::Validate;

// =============================================================================
// MetadataKey
// =============================================================================

/// A gRPC metadata key parsed from configuration.
#[derive(Debug, Clone, PartialEq, Eq, Hash, Deref, From, Display)]
pub struct MetadataKey(tonic::metadata::AsciiMetadataKey);

impl<'de> Deserialize<'de> for MetadataKey {
    fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
    where
        D: Deserializer<'de>,
    {
        let s = String::deserialize(deserializer)?;
        s.parse::<tonic::metadata::AsciiMetadataKey>()
            .map(Self)
            .map_err(serde::de::Error::custom)
    }
}

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

impl JsonSchema for MetadataKey {
    fn schema_name() -> Cow<'static, str> {
        Cow::Borrowed("MetadataKey")
    }

    fn json_schema(generator: &mut schemars::SchemaGenerator) -> schemars::Schema {
        String::json_schema(generator)
    }
}

impl Validate for MetadataKey {}

// =============================================================================
// MetadataValue
// =============================================================================

/// A gRPC metadata value parsed from configuration.
#[derive(Debug, Clone, PartialEq, Eq, Hash, Deref, From)]
pub struct MetadataValue(tonic::metadata::AsciiMetadataValue);

impl<'de> Deserialize<'de> for MetadataValue {
    fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
    where
        D: Deserializer<'de>,
    {
        let s = String::deserialize(deserializer)?;
        s.parse::<tonic::metadata::AsciiMetadataValue>()
            .map(Self)
            .map_err(serde::de::Error::custom)
    }
}

impl Serialize for MetadataValue {
    fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
    where
        S: serde::Serializer,
    {
        self.0
            .to_str()
            .map_err(serde::ser::Error::custom)?
            .serialize(serializer)
    }
}

impl JsonSchema for MetadataValue {
    fn schema_name() -> Cow<'static, str> {
        Cow::Borrowed("MetadataValue")
    }

    fn json_schema(generator: &mut schemars::SchemaGenerator) -> schemars::Schema {
        String::json_schema(generator)
    }
}

impl Validate for MetadataValue {}