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router.rs
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router.rs
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#![allow(missing_docs)] // FIXME
#![allow(deprecated)] // Note: Required to prevents complaints on enum declaration
use std::fs;
use std::net::IpAddr;
use std::path::Path;
use std::path::PathBuf;
use std::pin::Pin;
use std::sync::Arc;
use std::task::Context;
use std::task::Poll;
use std::time::Duration;
use derivative::Derivative;
use derive_more::Display;
use derive_more::From;
use displaydoc::Display as DisplayDoc;
use futures::channel::oneshot;
use futures::prelude::*;
use futures::FutureExt;
use http_body::Body as _;
use hyper::Body;
use thiserror::Error;
use tokio::sync::RwLock;
use tokio::task::spawn;
use tower::BoxError;
use tower::ServiceExt;
use tracing_futures::WithSubscriber;
use url::Url;
use self::Event::NoMoreConfiguration;
use self::Event::NoMoreSchema;
use self::Event::Shutdown;
use self::Event::UpdateConfiguration;
use self::Event::UpdateSchema;
use crate::axum_factory::make_axum_router;
use crate::axum_factory::AxumHttpServerFactory;
use crate::axum_factory::ListenAddrAndRouter;
use crate::cache::DeduplicatingCache;
use crate::configuration::Configuration;
use crate::configuration::ListenAddr;
use crate::plugin::DynPlugin;
use crate::router_factory::SupergraphServiceConfigurator;
use crate::router_factory::SupergraphServiceFactory;
use crate::router_factory::YamlSupergraphServiceFactory;
use crate::services::layers::apq::APQLayer;
use crate::services::transport;
use crate::spec::Schema;
use crate::state_machine::StateMachine;
type SchemaStream = Pin<Box<dyn Stream<Item = String> + Send>>;
// For now this is unused:
#[allow(unused)]
// Later we might add a public API for this (probably a builder similar to `test_harness.rs`),
// see https://github.com/apollographql/router/issues/1496.
// In the meantime keeping this function helps make sure it still compiles.
async fn make_transport_service<RF>(
schema: &str,
configuration: Arc<Configuration>,
extra_plugins: Vec<(String, Box<dyn DynPlugin>)>,
) -> Result<transport::BoxCloneService, BoxError> {
let schema = Arc::new(Schema::parse(schema, &configuration)?);
let service_factory = YamlSupergraphServiceFactory
.create(configuration.clone(), schema, None, Some(extra_plugins))
.await?;
let apq = APQLayer::with_cache(DeduplicatingCache::new().await);
let web_endpoints = service_factory.web_endpoints();
let routers = make_axum_router(service_factory, &configuration, web_endpoints, apq)?;
// FIXME: how should
let ListenAddrAndRouter(_listener, router) = routers.main;
Ok(router
.map_response(|response| {
response.map(|body| {
// Axum makes this `body` have type:
// https://docs.rs/http-body/0.4.5/http_body/combinators/struct.UnsyncBoxBody.html
let mut body = Box::pin(body);
// We make a stream based on its `poll_data` method
// in order to create a `hyper::Body`.
Body::wrap_stream(stream::poll_fn(move |ctx| body.as_mut().poll_data(ctx)))
// … but we ignore the `poll_trailers` method:
// https://docs.rs/http-body/0.4.5/http_body/trait.Body.html#tymethod.poll_trailers
// Apparently HTTP/2 trailers are like headers, except after the response body.
// I (Simon) believe nothing in the Apollo Router uses trailers as of this writing,
// so ignoring `poll_trailers` is fine.
// If we want to use trailers, we may need remove this convertion to `hyper::Body`
// and return `UnsyncBoxBody` (a.k.a. `axum::BoxBody`) as-is.
})
})
.map_err(|error| match error {})
.boxed_clone())
}
/// Error types for FederatedServer.
#[derive(Error, Debug, DisplayDoc)]
pub enum ApolloRouterError {
/// failed to start server
StartupError,
/// failed to stop HTTP Server
HttpServerLifecycleError,
/// no valid configuration was supplied
NoConfiguration,
/// no valid schema was supplied
NoSchema,
/// could not create the HTTP pipeline: {0}
ServiceCreationError(BoxError),
/// could not create the HTTP server: {0}
ServerCreationError(std::io::Error),
/// tried to bind {0} and {1} on port {2}
DifferentListenAddrsOnSamePort(IpAddr, IpAddr, u16),
/// tried to register two endpoints on `{0}:{1}{2}`
SameRouteUsedTwice(IpAddr, u16, String),
}
/// The user supplied schema. Either a static string or a stream for hot reloading.
#[derive(From, Display, Derivative)]
#[derivative(Debug)]
#[non_exhaustive]
pub enum SchemaSource {
/// A static schema.
#[display(fmt = "String")]
Static { schema_sdl: String },
/// A stream of schema.
#[display(fmt = "Stream")]
Stream(#[derivative(Debug = "ignore")] SchemaStream),
/// A YAML file that may be watched for changes.
#[display(fmt = "File")]
File {
/// The path of the schema file.
path: PathBuf,
/// `true` to watch the file for changes and hot apply them.
watch: bool,
/// When watching, the delay to wait before applying the new schema.
/// Note: This variable is deprecated and has no effect.
#[deprecated]
delay: Option<Duration>,
},
/// Apollo managed federation.
#[display(fmt = "Registry")]
Registry {
/// The Apollo key: <YOUR_GRAPH_API_KEY>
apollo_key: String,
/// The apollo graph reference: <YOUR_GRAPH_ID>@<VARIANT>
apollo_graph_ref: String,
/// The endpoint polled to fetch its latest supergraph schema.
urls: Option<Vec<Url>>,
/// The duration between polling
poll_interval: Duration,
},
}
impl From<&'_ str> for SchemaSource {
fn from(s: &'_ str) -> Self {
Self::Static {
schema_sdl: s.to_owned(),
}
}
}
impl SchemaSource {
/// Convert this schema into a stream regardless of if is static or not. Allows for unified handling later.
fn into_stream(self) -> impl Stream<Item = Event> {
match self {
SchemaSource::Static { schema_sdl: schema } => {
stream::once(future::ready(UpdateSchema(schema))).boxed()
}
SchemaSource::Stream(stream) => stream.map(UpdateSchema).boxed(),
#[allow(deprecated)]
SchemaSource::File {
path,
watch,
delay: _,
} => {
// Sanity check, does the schema file exists, if it doesn't then bail.
if !path.exists() {
tracing::error!(
"Schema file at path '{}' does not exist.",
path.to_string_lossy()
);
stream::empty().boxed()
} else {
//The schema file exists try and load it
match std::fs::read_to_string(&path) {
Ok(schema) => {
if watch {
crate::files::watch(&path)
.filter_map(move |_| {
future::ready(std::fs::read_to_string(&path).ok())
})
.map(UpdateSchema)
.boxed()
} else {
stream::once(future::ready(UpdateSchema(schema))).boxed()
}
}
Err(err) => {
tracing::error!("Failed to read schema: {}", err);
stream::empty().boxed()
}
}
}
}
SchemaSource::Registry {
apollo_key,
apollo_graph_ref,
urls,
poll_interval,
} => {
// With regards to ELv2 licensing, the code inside this block
// is license key functionality
crate::uplink::stream_supergraph(apollo_key, apollo_graph_ref, urls, poll_interval)
.filter_map(|res| {
future::ready(match res {
Ok(schema_result) => Some(UpdateSchema(schema_result.schema)),
Err(e) => {
tracing::error!("{}", e);
None
}
})
})
.boxed()
}
}
.chain(stream::iter(vec![NoMoreSchema]))
}
}
type ConfigurationStream = Pin<Box<dyn Stream<Item = Configuration> + Send>>;
/// The user supplied config. Either a static instance or a stream for hot reloading.
#[derive(From, Display, Derivative)]
#[derivative(Debug)]
#[non_exhaustive]
pub enum ConfigurationSource {
/// A static configuration.
///
/// Can be created through `serde::Deserialize` from various formats,
/// or inline in Rust code with `serde_json::json!` and `serde_json::from_value`.
#[display(fmt = "Static")]
#[from(types(Configuration))]
Static(Box<Configuration>),
/// A configuration stream where the server will react to new configuration. If possible
/// the configuration will be applied without restarting the internal http server.
#[display(fmt = "Stream")]
Stream(#[derivative(Debug = "ignore")] ConfigurationStream),
/// A yaml file that may be watched for changes
#[display(fmt = "File")]
File {
/// The path of the configuration file.
path: PathBuf,
/// `true` to watch the file for changes and hot apply them.
watch: bool,
/// When watching, the delay to wait before applying the new configuration.
/// Note: This variable is deprecated and has no effect.
#[deprecated]
delay: Option<Duration>,
},
}
impl Default for ConfigurationSource {
fn default() -> Self {
ConfigurationSource::Static(Default::default())
}
}
impl ConfigurationSource {
/// Convert this config into a stream regardless of if is static or not. Allows for unified handling later.
fn into_stream(self) -> impl Stream<Item = Event> {
match self {
ConfigurationSource::Static(instance) => {
stream::iter(vec![UpdateConfiguration(instance)]).boxed()
}
ConfigurationSource::Stream(stream) => {
stream.map(|x| UpdateConfiguration(Box::new(x))).boxed()
}
#[allow(deprecated)]
ConfigurationSource::File {
path,
watch,
delay: _,
} => {
// Sanity check, does the config file exists, if it doesn't then bail.
if !path.exists() {
tracing::error!(
"configuration file at path '{}' does not exist.",
path.to_string_lossy()
);
stream::empty().boxed()
} else if watch {
crate::files::watch(&path)
.map(move |_| match ConfigurationSource::read_config(&path) {
Ok(config) => UpdateConfiguration(Box::new(config)),
Err(err) => {
tracing::error!("{}", err);
NoMoreConfiguration
}
})
.boxed()
} else {
match ConfigurationSource::read_config(&path) {
Ok(configuration) => {
#[cfg(any(test, not(unix)))]
{
stream::once(future::ready(UpdateConfiguration(Box::new(
configuration,
))))
.boxed()
}
#[cfg(all(not(test), unix))]
{
let mut sighup_stream = tokio::signal::unix::signal(
tokio::signal::unix::SignalKind::hangup(),
)
.expect("Failed to install SIGHUP signal handler");
let (mut tx, rx) = futures::channel::mpsc::channel(1);
tokio::task::spawn(async move {
while let Some(()) = sighup_stream.recv().await {
tx.send(()).await.unwrap();
}
});
futures::stream::select(
stream::once(future::ready(UpdateConfiguration(Box::new(
configuration,
))))
.boxed(),
rx.filter_map(
move |()| match ConfigurationSource::read_config(&path) {
Ok(configuration) => future::ready(Some(
UpdateConfiguration(Box::new(configuration)),
)),
Err(err) => {
tracing::error!("{}", err);
future::ready(None)
}
},
)
.boxed(),
)
.boxed()
}
}
Err(err) => {
tracing::error!("{}", err);
stream::empty().boxed()
}
}
}
}
}
.chain(stream::iter(vec![NoMoreConfiguration]))
.boxed()
}
fn read_config(path: &Path) -> Result<Configuration, ReadConfigError> {
let config = fs::read_to_string(path)?;
config.parse().map_err(ReadConfigError::Validation)
}
}
#[derive(From, Display)]
enum ReadConfigError {
/// could not read configuration: {0}
Io(std::io::Error),
/// {0}
Validation(crate::configuration::ConfigurationError),
}
type ShutdownFuture = Pin<Box<dyn Future<Output = ()> + Send>>;
/// Specifies when the Router’s HTTP server should gracefully shutdown
#[derive(Display, Derivative)]
#[derivative(Debug)]
#[non_exhaustive]
pub enum ShutdownSource {
/// No graceful shutdown
#[display(fmt = "None")]
None,
/// A custom shutdown future.
#[display(fmt = "Custom")]
Custom(#[derivative(Debug = "ignore")] ShutdownFuture),
/// Watch for Ctl-C signal.
#[display(fmt = "CtrlC")]
CtrlC,
}
impl ShutdownSource {
/// Convert this shutdown hook into a future. Allows for unified handling later.
fn into_stream(self) -> impl Stream<Item = Event> {
match self {
ShutdownSource::None => stream::pending::<Event>().boxed(),
ShutdownSource::Custom(future) => future.map(|_| Shutdown).into_stream().boxed(),
ShutdownSource::CtrlC => {
#[cfg(not(unix))]
{
async {
tokio::signal::ctrl_c()
.await
.expect("Failed to install CTRL+C signal handler");
}
.map(|_| Shutdown)
.into_stream()
.boxed()
}
#[cfg(unix)]
future::select(
tokio::signal::ctrl_c().map(|s| s.ok()).boxed(),
async {
tokio::signal::unix::signal(tokio::signal::unix::SignalKind::terminate())
.expect("Failed to install SIGTERM signal handler")
.recv()
.await
}
.boxed(),
)
.map(|_| Shutdown)
.into_stream()
.boxed()
}
}
}
}
/// The entry point for running the Router’s HTTP server.
///
/// # Examples
///
/// ```
/// use apollo_router::RouterHttpServer;
/// use apollo_router::Configuration;
///
/// async {
/// let configuration = serde_yaml::from_str::<Configuration>("Config").unwrap();
/// let schema = "schema";
/// RouterHttpServer::builder()
/// .configuration(configuration)
/// .schema(schema)
/// .start()
/// .await;
/// };
/// ```
///
/// Shutdown via handle.
/// ```
/// use apollo_router::RouterHttpServer;
/// use apollo_router::Configuration;
///
/// async {
/// let configuration = serde_yaml::from_str::<Configuration>("Config").unwrap();
/// let schema = "schema";
/// let mut server = RouterHttpServer::builder()
/// .configuration(configuration)
/// .schema(schema)
/// .start();
/// // …
/// server.shutdown().await
/// };
/// ```
///
pub struct RouterHttpServer {
result: Pin<Box<dyn Future<Output = Result<(), ApolloRouterError>> + Send>>,
graphql_listen_address: Arc<RwLock<Option<ListenAddr>>>,
extra_listen_adresses: Arc<RwLock<Vec<ListenAddr>>>,
shutdown_sender: Option<oneshot::Sender<()>>,
}
#[buildstructor::buildstructor]
impl RouterHttpServer {
/// Returns a builder to start an HTTP server in a separate Tokio task.
///
/// Builder methods:
///
/// * `.schema(impl Into<`[`SchemaSource`]`>)`
/// Required.
/// Specifies where to find the supergraph schema definition.
/// Some sources support hot-reloading.
///
/// * `.configuration(impl Into<`[`ConfigurationSource`]`>)`
/// Optional.
/// Specifies where to find the router configuration.
/// If not provided, the default configuration as with an empty YAML file.
///
/// * `.shutdown(impl Into<`[`ShutdownSource`]`>)`
/// Optional.
/// Specifies when the server should gracefully shut down.
/// If not provided, the default is [`ShutdownSource::CtrlC`].
///
/// * `.start()`
/// Finishes the builder,
/// starts an HTTP server in a separate Tokio task,
/// and returns a `RouterHttpServer` handle.
///
/// The server handle can be used in multiple ways.
/// As a [`Future`], it resolves to `Result<(), `[`ApolloRouterError`]`>`
/// either when the server has finished gracefully shutting down
/// or when it encounters a fatal error that prevents it from starting.
///
/// If the handle is dropped before being awaited as a future,
/// a graceful shutdown is triggered.
/// In order to wait until shutdown finishes,
/// use the [`shutdown`][Self::shutdown] method instead.
#[builder(visibility = "pub", entry = "builder", exit = "start")]
fn start(
schema: SchemaSource,
configuration: Option<ConfigurationSource>,
shutdown: Option<ShutdownSource>,
) -> RouterHttpServer {
let (shutdown_sender, shutdown_receiver) = oneshot::channel::<()>();
let event_stream = generate_event_stream(
shutdown.unwrap_or(ShutdownSource::CtrlC),
configuration.unwrap_or_default(),
schema,
shutdown_receiver,
);
let server_factory = AxumHttpServerFactory::new();
let router_factory = YamlSupergraphServiceFactory::default();
let state_machine = StateMachine::new(server_factory, router_factory);
let extra_listen_adresses = state_machine.extra_listen_adresses.clone();
let graphql_listen_address = state_machine.graphql_listen_address.clone();
let result = spawn(
async move { state_machine.process_events(event_stream).await }
.with_current_subscriber(),
)
.map(|r| match r {
Ok(Ok(ok)) => Ok(ok),
Ok(Err(err)) => Err(err),
Err(err) => {
tracing::error!("{}", err);
Err(ApolloRouterError::StartupError)
}
})
.with_current_subscriber()
.boxed();
RouterHttpServer {
result,
shutdown_sender: Some(shutdown_sender),
graphql_listen_address,
extra_listen_adresses,
}
}
/// Returns the listen address when the router is ready to receive GraphQL requests.
///
/// This can be useful when the `server.listen` configuration specifies TCP port 0,
/// which instructs the operating system to pick an available port number.
///
/// Note: if configuration is dynamic, the listen address can change over time.
pub async fn listen_address(&self) -> Option<ListenAddr> {
self.graphql_listen_address.read().await.clone()
}
/// Returns the extra listen addresses the router can receive requests to.
///
/// Combine it with `listen_address` to have an exhaustive list
/// of all addresses used by the router.
/// Note: if configuration is dynamic, the listen address can change over time.
pub async fn extra_listen_adresses(&self) -> Vec<ListenAddr> {
self.extra_listen_adresses.read().await.clone()
}
/// Trigger and wait for graceful shutdown
pub async fn shutdown(&mut self) -> Result<(), ApolloRouterError> {
if let Some(sender) = self.shutdown_sender.take() {
let _ = sender.send(());
}
(&mut self.result).await
}
}
/// Messages that are broadcast across the app.
#[derive(Debug)]
pub(crate) enum Event {
/// The configuration was updated.
UpdateConfiguration(Box<Configuration>),
/// There are no more updates to the configuration
NoMoreConfiguration,
/// The schema was updated.
UpdateSchema(String),
/// There are no more updates to the schema
NoMoreSchema,
/// The server should gracefully shutdown.
Shutdown,
}
impl Drop for RouterHttpServer {
fn drop(&mut self) {
if let Some(sender) = self.shutdown_sender.take() {
let _ = sender.send(());
}
}
}
impl Future for RouterHttpServer {
type Output = Result<(), ApolloRouterError>;
fn poll(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> {
self.result.poll_unpin(cx)
}
}
/// Create the unified event stream.
/// This merges all contributing streams and sets up shutdown handling.
/// When a shutdown message is received no more events are emitted.
fn generate_event_stream(
shutdown: ShutdownSource,
configuration: ConfigurationSource,
schema: SchemaSource,
shutdown_receiver: oneshot::Receiver<()>,
) -> impl Stream<Item = Event> {
// Chain is required so that the final shutdown message is sent.
stream::select_all(vec![
shutdown.into_stream().boxed(),
configuration.into_stream().boxed(),
schema.into_stream().boxed(),
shutdown_receiver.into_stream().map(|_| Shutdown).boxed(),
])
.take_while(|msg| future::ready(!matches!(msg, Shutdown)))
.chain(stream::iter(vec![Shutdown]))
.boxed()
}
#[cfg(test)]
mod tests {
use std::env::temp_dir;
use serde_json::json;
use serde_json::to_string_pretty;
use serde_json::Value;
use test_log::test;
use super::*;
use crate::files::tests::create_temp_file;
use crate::files::tests::write_and_flush;
use crate::graphql;
use crate::graphql::Request;
fn init_with_server() -> RouterHttpServer {
let configuration =
serde_yaml::from_str::<Configuration>(include_str!("testdata/supergraph_config.yaml"))
.unwrap();
let schema = include_str!("testdata/supergraph.graphql");
RouterHttpServer::builder()
.configuration(configuration)
.schema(schema)
.start()
}
#[tokio::test(flavor = "multi_thread")]
async fn basic_request() {
let mut router_handle = init_with_server();
let listen_address = router_handle
.listen_address()
.await
.expect("router failed to start");
assert_federated_response(&listen_address, r#"{ topProducts { name } }"#).await;
router_handle.shutdown().await.unwrap();
}
async fn assert_federated_response(listen_addr: &ListenAddr, request: &str) {
let request = Request::builder().query(request).build();
let expected = query(listen_addr, &request).await.unwrap();
let response = to_string_pretty(&expected).unwrap();
assert!(!response.is_empty());
}
async fn query(
listen_addr: &ListenAddr,
request: &graphql::Request,
) -> Result<graphql::Response, crate::error::FetchError> {
Ok(reqwest::Client::new()
.post(format!("{}/", listen_addr))
.json(request)
.send()
.await
.expect("couldn't send request")
.json()
.await
.expect("couldn't deserialize into json"))
}
#[tokio::test(flavor = "multi_thread")]
async fn config_by_file_watching() {
let (path, mut file) = create_temp_file();
let contents = include_str!("testdata/supergraph_config.yaml");
write_and_flush(&mut file, contents).await;
let mut stream = ConfigurationSource::File {
path,
watch: true,
delay: None,
}
.into_stream()
.boxed();
// First update is guaranteed
assert!(matches!(
stream.next().await.unwrap(),
UpdateConfiguration(_)
));
// Modify the file and try again
write_and_flush(&mut file, contents).await;
assert!(matches!(
stream.next().await.unwrap(),
UpdateConfiguration(_)
));
// This time write garbage, there should not be an update.
write_and_flush(&mut file, ":garbage").await;
let event = stream.into_future().now_or_never();
assert!(event.is_none() || matches!(event, Some((Some(NoMoreConfiguration), _))));
}
#[tokio::test(flavor = "multi_thread")]
async fn config_dev_mode_without_file() {
let mut stream =
ConfigurationSource::from(Configuration::builder().dev(true).build().unwrap())
.into_stream()
.boxed();
let cfg = match stream.next().await.unwrap() {
UpdateConfiguration(configuration) => configuration,
_ => panic!("the event from the stream must be UpdateConfiguration"),
};
assert!(cfg.supergraph.introspection);
assert!(cfg.sandbox.enabled);
assert!(!cfg.homepage.enabled);
assert!(cfg.plugins().iter().any(
|(name, val)| name == "experimental.expose_query_plan" && val == &Value::Bool(true)
));
assert!(cfg
.plugins()
.iter()
.any(|(name, val)| name == "apollo.include_subgraph_errors"
&& val == &json!({"all": true})));
cfg.validate().unwrap();
}
#[tokio::test(flavor = "multi_thread")]
async fn config_by_file_invalid() {
let (path, mut file) = create_temp_file();
write_and_flush(&mut file, "Garbage").await;
let mut stream = ConfigurationSource::File {
path,
watch: true,
delay: None,
}
.into_stream();
// First update fails because the file is invalid.
assert!(matches!(stream.next().await.unwrap(), NoMoreConfiguration));
}
#[tokio::test(flavor = "multi_thread")]
async fn config_by_file_missing() {
let mut stream = ConfigurationSource::File {
path: temp_dir().join("does_not_exit"),
watch: true,
delay: None,
}
.into_stream();
// First update fails because the file is invalid.
assert!(matches!(stream.next().await.unwrap(), NoMoreConfiguration));
}
#[tokio::test(flavor = "multi_thread")]
async fn config_by_file_no_watch() {
let (path, mut file) = create_temp_file();
let contents = include_str!("testdata/supergraph_config.yaml");
write_and_flush(&mut file, contents).await;
let mut stream = ConfigurationSource::File {
path,
watch: false,
delay: None,
}
.into_stream();
assert!(matches!(
stream.next().await.unwrap(),
UpdateConfiguration(_)
));
assert!(matches!(stream.next().await.unwrap(), NoMoreConfiguration));
}
#[test(tokio::test)]
async fn schema_by_file_watching() {
let (path, mut file) = create_temp_file();
let schema = include_str!("testdata/supergraph.graphql");
write_and_flush(&mut file, schema).await;
let mut stream = SchemaSource::File {
path,
watch: true,
delay: None,
}
.into_stream()
.boxed();
// First update is guaranteed
assert!(matches!(stream.next().await.unwrap(), UpdateSchema(_)));
// Modify the file and try again
write_and_flush(&mut file, schema).await;
assert!(matches!(stream.next().await.unwrap(), UpdateSchema(_)));
}
#[test(tokio::test)]
async fn schema_by_file_missing() {
let mut stream = SchemaSource::File {
path: temp_dir().join("does_not_exit"),
watch: true,
delay: None,
}
.into_stream();
// First update fails because the file is invalid.
assert!(matches!(stream.next().await.unwrap(), NoMoreSchema));
}
#[test(tokio::test)]
async fn schema_by_file_no_watch() {
let (path, mut file) = create_temp_file();
let schema = include_str!("testdata/supergraph.graphql");
write_and_flush(&mut file, schema).await;
let mut stream = SchemaSource::File {
path,
watch: false,
delay: None,
}
.into_stream();
assert!(matches!(stream.next().await.unwrap(), UpdateSchema(_)));
assert!(matches!(stream.next().await.unwrap(), NoMoreSchema));
}
}