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use super::{Node, NodeContext, NodeKind, NodeRequest, NodeResponse};
use crate::{config::DynNode, error::ServiceError};
use anyhow::Result;
use futures::Future;
use hyper::{
header::{HeaderName, HeaderValue},
HeaderMap,
};
use serde::Deserialize;
use std::{collections::BTreeMap, pin::Pin, str::FromStr, sync::Arc};
pub struct HeadersKind;
#[derive(Deserialize)]
pub struct Headers {
headers: HeaderMapWrap,
inner: DynNode,
}
impl NodeKind for HeadersKind {
fn name(&self) -> &'static str {
"headers"
}
fn instanciate(&self, config: serde_yaml::Value) -> Result<Arc<dyn Node>> {
Ok(Arc::new(serde_yaml::from_value::<Headers>(config)?))
}
}
impl Node for Headers {
fn handle<'a>(
&'a self,
context: &'a mut NodeContext,
request: NodeRequest,
) -> Pin<Box<dyn Future<Output = Result<NodeResponse, ServiceError>> + Send + Sync + 'a>> {
Box::pin(async move {
let mut resp = self.inner.handle(context, request).await?;
resp.headers_mut()
.extend(self.headers.0.clone().into_iter());
Ok(resp)
})
}
}
struct HeaderMapWrap(HeaderMap);
impl<'de> Deserialize<'de> for HeaderMapWrap {
fn deserialize<D>(deserializer: D) -> std::result::Result<Self, D::Error>
where
D: serde::Deserializer<'de>,
{
let headers = BTreeMap::<String, String>::deserialize(deserializer)?;
let mut hm = HeaderMap::new();
for (k, v) in headers {
hm.insert(
HeaderName::from_str(&k).map_err(|e| serde::de::Error::custom(format!("{e}")))?,
HeaderValue::from_str(&v).map_err(|e| serde::de::Error::custom(format!("{e}")))?,
);
}
Ok(HeaderMapWrap(hm))
}
}
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