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use crate::error::Error;
use crate::frame::{Header, HeaderValue, Message};
use crate::str_bytes::StrBytes;
use aws_smithy_types::{Blob, DateTime};
macro_rules! expect_shape_fn {
(fn $fn_name:ident[$val_typ:ident] -> $result_typ:ident { $val_name:ident -> $val_expr:expr }) => {
#[doc = "Expects that `header` is a `"]
#[doc = stringify!($result_typ)]
#[doc = "`."]
pub fn $fn_name(header: &Header) -> Result<$result_typ, Error> {
match header.value() {
HeaderValue::$val_typ($val_name) => Ok($val_expr),
_ => Err(Error::Unmarshalling(format!(
"expected '{}' header value to be {}",
header.name().as_str(),
stringify!($val_typ)
))),
}
}
};
}
expect_shape_fn!(fn expect_bool[Bool] -> bool { value -> *value });
expect_shape_fn!(fn expect_byte[Byte] -> i8 { value -> *value });
expect_shape_fn!(fn expect_int16[Int16] -> i16 { value -> *value });
expect_shape_fn!(fn expect_int32[Int32] -> i32 { value -> *value });
expect_shape_fn!(fn expect_int64[Int64] -> i64 { value -> *value });
expect_shape_fn!(fn expect_byte_array[ByteArray] -> Blob { bytes -> Blob::new(bytes.as_ref()) });
expect_shape_fn!(fn expect_string[String] -> String { value -> value.as_str().into() });
expect_shape_fn!(fn expect_timestamp[Timestamp] -> DateTime { value -> *value });
#[derive(Debug)]
pub struct ResponseHeaders<'a> {
pub content_type: Option<&'a StrBytes>,
pub message_type: &'a StrBytes,
pub smithy_type: &'a StrBytes,
}
impl<'a> ResponseHeaders<'a> {
pub fn content_type(&self) -> Option<&str> {
self.content_type.map(|ct| ct.as_str())
}
}
fn expect_header_str_value<'a>(
header: Option<&'a Header>,
name: &str,
) -> Result<&'a StrBytes, Error> {
match header {
Some(header) => Ok(header.value().as_string().map_err(|value| {
Error::Unmarshalling(format!(
"expected response {} header to be string, received {:?}",
name, value
))
})?),
None => Err(Error::Unmarshalling(format!(
"expected response to include {} header, but it was missing",
name
))),
}
}
pub fn parse_response_headers(message: &Message) -> Result<ResponseHeaders<'_>, Error> {
let (mut content_type, mut message_type, mut event_type, mut exception_type) =
(None, None, None, None);
for header in message.headers() {
match header.name().as_str() {
":content-type" => content_type = Some(header),
":message-type" => message_type = Some(header),
":event-type" => event_type = Some(header),
":exception-type" => exception_type = Some(header),
_ => {}
}
}
let message_type = expect_header_str_value(message_type, ":message-type")?;
Ok(ResponseHeaders {
content_type: content_type
.map(|ct| expect_header_str_value(Some(ct), ":content-type"))
.transpose()?,
message_type,
smithy_type: if message_type.as_str() == "event" {
expect_header_str_value(event_type, ":event-type")?
} else if message_type.as_str() == "exception" {
expect_header_str_value(exception_type, ":exception-type")?
} else {
return Err(Error::Unmarshalling(format!(
"unrecognized `:message-type`: {}",
message_type.as_str()
)));
},
})
}
#[cfg(test)]
mod tests {
use super::parse_response_headers;
use crate::frame::{Header, HeaderValue, Message};
#[test]
fn normal_message() {
let message = Message::new(&b"test"[..])
.add_header(Header::new(
":event-type",
HeaderValue::String("Foo".into()),
))
.add_header(Header::new(
":content-type",
HeaderValue::String("application/json".into()),
))
.add_header(Header::new(
":message-type",
HeaderValue::String("event".into()),
));
let parsed = parse_response_headers(&message).unwrap();
assert_eq!("Foo", parsed.smithy_type.as_str());
assert_eq!(Some("application/json"), parsed.content_type());
assert_eq!("event", parsed.message_type.as_str());
}
#[test]
fn error_message() {
let message = Message::new(&b"test"[..])
.add_header(Header::new(
":exception-type",
HeaderValue::String("BadRequestException".into()),
))
.add_header(Header::new(
":content-type",
HeaderValue::String("application/json".into()),
))
.add_header(Header::new(
":message-type",
HeaderValue::String("exception".into()),
));
let parsed = parse_response_headers(&message).unwrap();
assert_eq!("BadRequestException", parsed.smithy_type.as_str());
assert_eq!(Some("application/json"), parsed.content_type());
assert_eq!("exception", parsed.message_type.as_str());
}
#[test]
fn missing_exception_type() {
let message = Message::new(&b"test"[..])
.add_header(Header::new(
":content-type",
HeaderValue::String("application/json".into()),
))
.add_header(Header::new(
":message-type",
HeaderValue::String("exception".into()),
));
let error = parse_response_headers(&message).err().unwrap().to_string();
assert_eq!(
"failed to unmarshall message: expected response to include :exception-type \
header, but it was missing",
error
);
}
#[test]
fn missing_event_type() {
let message = Message::new(&b"test"[..])
.add_header(Header::new(
":content-type",
HeaderValue::String("application/json".into()),
))
.add_header(Header::new(
":message-type",
HeaderValue::String("event".into()),
));
let error = parse_response_headers(&message).err().unwrap().to_string();
assert_eq!(
"failed to unmarshall message: expected response to include :event-type \
header, but it was missing",
error
);
}
#[test]
fn missing_content_type() {
let message = Message::new(&b"test"[..])
.add_header(Header::new(
":event-type",
HeaderValue::String("Foo".into()),
))
.add_header(Header::new(
":message-type",
HeaderValue::String("event".into()),
));
let parsed = parse_response_headers(&message).ok().unwrap();
assert_eq!(None, parsed.content_type);
assert_eq!("Foo", parsed.smithy_type.as_str());
assert_eq!("event", parsed.message_type.as_str());
}
#[test]
fn content_type_wrong_type() {
let message = Message::new(&b"test"[..])
.add_header(Header::new(
":event-type",
HeaderValue::String("Foo".into()),
))
.add_header(Header::new(":content-type", HeaderValue::Int32(16)))
.add_header(Header::new(
":message-type",
HeaderValue::String("event".into()),
));
let error = parse_response_headers(&message).err().unwrap().to_string();
assert_eq!(
"failed to unmarshall message: expected response :content-type \
header to be string, received Int32(16)",
error
);
}
}