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use std::{
collections::btree_map::Entry,
sync::atomic::{AtomicU64, Ordering},
};
use anyhow::Result;
use hyper::{
Uri,
header::{HeaderName as HyperHeaderName, HeaderValue as HyperHeaderValue},
};
use turbo_rcstr::RcStr;
use turbo_tasks::{OperationVc, ResolvedVc, TransientInstance, Vc};
use super::{
ContentSource, ContentSourceContent, ContentSourceData, ContentSourceDataVary,
GetContentSourceContent, GetContentSourceContents, HeaderList, ProxyResult, RewriteType,
StaticContent,
headers::{HeaderValue, Headers},
query::Query,
request::SourceRequest,
route_tree::RouteTree,
};
/// The result of [`resolve_source_request`]. Similar to a
/// `ContentSourceContent`, but without the `Rewrite` variant as this is taken
/// care in the function.
#[turbo_tasks::value(serialization = "none", shared)]
pub enum ResolveSourceRequestResult {
NotFound,
Static(ResolvedVc<StaticContent>, ResolvedVc<HeaderList>),
HttpProxy(OperationVc<ProxyResult>),
}
#[turbo_tasks::function(operation)]
fn content_source_get_routes_operation(
source: OperationVc<Box<dyn ContentSource>>,
) -> Vc<RouteTree> {
source.connect().get_routes()
}
#[turbo_tasks::function(operation)]
fn route_tree_get_operation(
route_tree: ResolvedVc<RouteTree>,
asset_path: RcStr,
) -> Vc<GetContentSourceContents> {
route_tree.get(asset_path)
}
#[turbo_tasks::function(operation)]
fn get_content_source_content_vary_operation(
get_content: ResolvedVc<Box<dyn GetContentSourceContent>>,
) -> Vc<ContentSourceDataVary> {
get_content.vary()
}
#[turbo_tasks::function(operation)]
fn get_content_source_content_get_operation(
get_content: ResolvedVc<Box<dyn GetContentSourceContent>>,
path: RcStr,
data: ContentSourceData,
) -> Vc<ContentSourceContent> {
get_content.get(path, data)
}
/// Resolves a [SourceRequest] within a [super::ContentSource], returning the
/// corresponding content.
///
/// This function is the boundary of consistency. All invoked methods should be
/// invoked strongly consistent. This ensures that all requests serve the latest
/// version of the content. We don't make resolve_source_request strongly
/// consistent as we want get_routes and get to be independent consistent and
/// any side effect in get should not wait for recomputing of get_routes.
#[turbo_tasks::function(operation)]
pub async fn resolve_source_request(
source: OperationVc<Box<dyn ContentSource>>,
request: TransientInstance<SourceRequest>,
) -> Result<Vc<ResolveSourceRequestResult>> {
let original_path = request.uri.path().to_string();
// Remove leading slash.
let mut current_asset_path: RcStr = urlencoding::decode(&original_path[1..])?.into();
let mut request_overwrites = (*request).clone();
let mut response_header_overwrites = Vec::new();
let mut route_tree = content_source_get_routes_operation(source)
.resolve_strongly_consistent()
.await?;
'routes: loop {
let mut sources_op = route_tree_get_operation(route_tree, current_asset_path.clone());
'sources: loop {
for &get_content in sources_op.read_strongly_consistent().await?.iter() {
let content_vary = get_content_source_content_vary_operation(get_content)
.read_strongly_consistent()
.await?;
let content_data =
request_to_data(&request_overwrites, &request, &content_vary).await?;
let content_op = get_content_source_content_get_operation(
get_content,
current_asset_path.clone(),
content_data,
);
match &*content_op.read_strongly_consistent().await? {
ContentSourceContent::Rewrite(rewrite) => {
let rewrite = rewrite.await?;
// apply rewrite extras
if let Some(headers) = &rewrite.response_headers {
response_header_overwrites.extend(headers.await?.iter().cloned());
}
if let Some(headers) = &rewrite.request_headers {
request_overwrites.headers.clear();
for (name, value) in &*headers.await? {
request_overwrites.headers.insert(
HyperHeaderName::try_from(name.as_str())?,
HyperHeaderValue::try_from(value.as_str())?,
);
}
}
// do the rewrite
match &rewrite.ty {
RewriteType::Location { path_and_query } => {
let new_uri = Uri::try_from(path_and_query.as_str())?;
let new_asset_path =
urlencoding::decode(&new_uri.path()[1..])?.into_owned();
request_overwrites.uri = new_uri;
current_asset_path = new_asset_path.into();
continue 'routes;
}
RewriteType::ContentSource {
source,
path_and_query,
} => {
let new_uri = Uri::try_from(path_and_query.as_str())?;
let new_asset_path =
urlencoding::decode(&new_uri.path()[1..])?.into_owned();
request_overwrites.uri = new_uri;
current_asset_path = new_asset_path.into();
route_tree = content_source_get_routes_operation(*source)
.resolve_strongly_consistent()
.await?;
continue 'routes;
}
RewriteType::Sources {
sources: new_sources,
} => {
sources_op = *new_sources;
continue 'sources;
}
}
}
ContentSourceContent::NotFound => {
return Ok(ResolveSourceRequestResult::NotFound.cell());
}
ContentSourceContent::Static(static_content) => {
return Ok(ResolveSourceRequestResult::Static(
*static_content,
HeaderList::new(response_header_overwrites)
.to_resolved()
.await?,
)
.cell());
}
ContentSourceContent::HttpProxy(proxy_result) => {
return Ok(ResolveSourceRequestResult::HttpProxy(*proxy_result).cell());
}
ContentSourceContent::Next => continue,
}
}
break;
}
break;
}
Ok(ResolveSourceRequestResult::NotFound.cell())
}
static CACHE_BUSTER: AtomicU64 = AtomicU64::new(0);
async fn request_to_data(
request: &SourceRequest,
original_request: &SourceRequest,
vary: &ContentSourceDataVary,
) -> Result<ContentSourceData> {
let mut data = ContentSourceData::default();
if vary.method {
data.method = Some(request.method.clone().into());
}
if vary.url {
data.url = Some(request.uri.to_string().into());
}
if vary.original_url {
data.original_url = Some(original_request.uri.to_string().into());
}
if vary.body {
data.body = Some(request.body.clone().resolved_cell());
}
if vary.raw_query {
data.raw_query = Some(request.uri.query().unwrap_or("").into());
}
if vary.raw_headers {
data.raw_headers = Some(
request
.headers
.iter()
.map(|(name, value)| {
Ok((name.to_string().into(), value.to_str()?.to_string().into()))
})
.collect::<Result<Vec<_>>>()?,
);
}
if let Some(filter) = vary.query.as_ref() {
if let Some(query) = request.uri.query() {
let mut query: Query = serde_qs::from_str(query)?;
query.filter_with(filter);
data.query = Some(query);
} else {
data.query = Some(Query::default())
}
}
if let Some(filter) = vary.headers.as_ref() {
let mut headers = Headers::default();
for (header_name, header_value) in request.headers.iter() {
if !filter.contains(header_name.as_str()) {
continue;
}
match headers.entry(header_name.to_string()) {
Entry::Vacant(e) => {
if let Ok(s) = header_value.to_str() {
e.insert(HeaderValue::SingleString(s.to_string()));
} else {
e.insert(HeaderValue::SingleBytes(header_value.as_bytes().to_vec()));
}
}
Entry::Occupied(mut e) => {
if let Ok(s) = header_value.to_str() {
e.get_mut().extend_with_string(s.to_string());
} else {
e.get_mut()
.extend_with_bytes(header_value.as_bytes().to_vec());
}
}
}
}
data.headers = Some(headers);
}
if vary.cache_buster {
data.cache_buster = CACHE_BUSTER.fetch_add(1, Ordering::SeqCst);
}
Ok(data)
}
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