aws_smithy_runtime_api/client/runtime_plugin.rs
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/*
* Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
* SPDX-License-Identifier: Apache-2.0
*/
//! Runtime plugin type definitions.
//!
//! Runtime plugins are used to extend the runtime with custom behavior.
//! This can include:
//! - Registering interceptors
//! - Registering auth schemes
//! - Adding entries to the [`ConfigBag`] for orchestration
//! - Setting runtime components
//!
//! Runtime plugins are divided into service/operation "levels", with service runtime plugins
//! executing before operation runtime plugins. Runtime plugins configured in a service
//! config will always be at the service level, while runtime plugins added during
//! operation customization will be at the operation level. Custom runtime plugins will
//! always run after the default runtime plugins within their level.
use crate::box_error::BoxError;
use crate::client::runtime_components::{
RuntimeComponentsBuilder, EMPTY_RUNTIME_COMPONENTS_BUILDER,
};
use crate::impl_shared_conversions;
use crate::shared::IntoShared;
use aws_smithy_types::config_bag::{ConfigBag, FrozenLayer};
use std::borrow::Cow;
use std::fmt::Debug;
use std::sync::Arc;
const DEFAULT_ORDER: Order = Order::Overrides;
/// Runtime plugin ordering.
///
/// There are two runtime plugin "levels" that run in the following order:
/// 1. Service runtime plugins - runtime plugins that pertain to the entire service.
/// 2. Operation runtime plugins - runtime plugins relevant only to a single operation.
///
/// This enum is used to determine runtime plugin order within those levels.
#[derive(Copy, Clone, Debug, Eq, PartialEq, PartialOrd, Ord)]
pub enum Order {
/// Runtime plugins with `Defaults` order are executed first within their level.
///
/// Runtime plugins with this order should only be used for registering default components and config.
Defaults,
/// Runtime plugins with `Overrides` order are executed after `Defaults` within their level.
///
/// This is the default order.
Overrides,
/// Runtime plugins with `NestedComponents` order are executed after `Overrides` within their level.
///
/// This level is intended to be used for wrapping components configured in previous runtime plugins.
NestedComponents,
}
/// Runtime plugin trait
///
/// A `RuntimePlugin` is the unit of configuration for augmenting the client with new behavior.
///
/// Runtime plugins can register interceptors, set runtime components, and modify configuration.
pub trait RuntimePlugin: Debug + Send + Sync {
/// Runtime plugin ordering.
///
/// There are two runtime plugin "levels" that run in the following order:
/// 1. Service runtime plugins - runtime plugins that pertain to the entire service.
/// 2. Operation runtime plugins - runtime plugins relevant only to a single operation.
///
/// This function is used to determine runtime plugin order within those levels. So
/// regardless of this `Order` value, service runtime plugins will still always execute before
/// operation runtime plugins. However, [`Defaults`](Order::Defaults)
/// service runtime plugins will run before [`Overrides`](Order::Overrides)
/// service runtime plugins.
fn order(&self) -> Order {
DEFAULT_ORDER
}
/// Optionally returns additional config that should be added to the [`ConfigBag`].
///
/// As a best practice, a frozen layer should be stored on the runtime plugin instance as
/// a member, and then cloned upon return since that clone is cheap. Constructing a new
/// [`Layer`](aws_smithy_types::config_bag::Layer) and freezing it will require a lot of allocations.
fn config(&self) -> Option<FrozenLayer> {
None
}
/// Returns a [`RuntimeComponentsBuilder`] to incorporate into the final runtime components.
///
/// The order of runtime plugins determines which runtime components "win". Components set by later runtime plugins will
/// override those set by earlier runtime plugins.
///
/// If no runtime component changes are desired, just return an empty builder.
///
/// This method returns a [`Cow`] for flexibility. Some implementers may want to store the components builder
/// as a member and return a reference to it, while others may need to create the builder every call. If possible,
/// returning a reference is preferred for performance.
///
/// Components configured by previous runtime plugins are in the `current_components` argument, and can be used
/// to create nested/wrapped components, such as a connector calling into an inner (customer provided) connector.
fn runtime_components(
&self,
current_components: &RuntimeComponentsBuilder,
) -> Cow<'_, RuntimeComponentsBuilder> {
let _ = current_components;
Cow::Borrowed(&EMPTY_RUNTIME_COMPONENTS_BUILDER)
}
}
/// Shared runtime plugin
///
/// Allows for multiple places to share ownership of one runtime plugin.
#[derive(Debug, Clone)]
pub struct SharedRuntimePlugin(Arc<dyn RuntimePlugin>);
impl SharedRuntimePlugin {
/// Creates a new [`SharedRuntimePlugin`].
pub fn new(plugin: impl RuntimePlugin + 'static) -> Self {
Self(Arc::new(plugin))
}
}
impl RuntimePlugin for SharedRuntimePlugin {
fn order(&self) -> Order {
self.0.order()
}
fn config(&self) -> Option<FrozenLayer> {
self.0.config()
}
fn runtime_components(
&self,
current_components: &RuntimeComponentsBuilder,
) -> Cow<'_, RuntimeComponentsBuilder> {
self.0.runtime_components(current_components)
}
}
impl_shared_conversions!(convert SharedRuntimePlugin from RuntimePlugin using SharedRuntimePlugin::new);
/// Runtime plugin that simply returns the config and components given at construction time.
#[derive(Default, Debug)]
pub struct StaticRuntimePlugin {
config: Option<FrozenLayer>,
runtime_components: Option<RuntimeComponentsBuilder>,
order: Option<Order>,
}
impl StaticRuntimePlugin {
/// Returns a new [`StaticRuntimePlugin`].
pub fn new() -> Self {
Default::default()
}
/// Changes the config.
pub fn with_config(mut self, config: FrozenLayer) -> Self {
self.config = Some(config);
self
}
/// Changes the runtime components.
pub fn with_runtime_components(mut self, runtime_components: RuntimeComponentsBuilder) -> Self {
self.runtime_components = Some(runtime_components);
self
}
/// Changes the order of this runtime plugin.
pub fn with_order(mut self, order: Order) -> Self {
self.order = Some(order);
self
}
}
impl RuntimePlugin for StaticRuntimePlugin {
fn order(&self) -> Order {
self.order.unwrap_or(DEFAULT_ORDER)
}
fn config(&self) -> Option<FrozenLayer> {
self.config.clone()
}
fn runtime_components(
&self,
_current_components: &RuntimeComponentsBuilder,
) -> Cow<'_, RuntimeComponentsBuilder> {
self.runtime_components
.as_ref()
.map(Cow::Borrowed)
.unwrap_or_else(|| Cow::Borrowed(&EMPTY_RUNTIME_COMPONENTS_BUILDER))
}
}
macro_rules! insert_plugin {
($vec:expr, $plugin:expr) => {{
// Insert the plugin in the correct order
let plugin = $plugin;
let mut insert_index = 0;
let order = plugin.order();
for (index, other_plugin) in $vec.iter().enumerate() {
let other_order = other_plugin.order();
if other_order <= order {
insert_index = index + 1;
} else if other_order > order {
break;
}
}
$vec.insert(insert_index, plugin);
}};
}
macro_rules! apply_plugins {
($name:ident, $plugins:expr, $cfg:ident) => {{
tracing::trace!(concat!("applying ", stringify!($name), " runtime plugins"));
let mut merged =
RuntimeComponentsBuilder::new(concat!("apply_", stringify!($name), "_configuration"));
for plugin in &$plugins {
if let Some(layer) = plugin.config() {
$cfg.push_shared_layer(layer);
}
let next = plugin.runtime_components(&merged);
merged = merged.merge_from(&next);
}
Ok(merged)
}};
}
/// Used internally in the orchestrator implementation and in the generated code. Not intended to be used elsewhere.
#[derive(Default, Clone, Debug)]
pub struct RuntimePlugins {
client_plugins: Vec<SharedRuntimePlugin>,
operation_plugins: Vec<SharedRuntimePlugin>,
}
impl RuntimePlugins {
/// Create a new empty set of runtime plugins.
pub fn new() -> Self {
Default::default()
}
/// Add several client-level runtime plugins from an iterator.
pub fn with_client_plugins(
mut self,
plugins: impl IntoIterator<Item = SharedRuntimePlugin>,
) -> Self {
for plugin in plugins.into_iter() {
self = self.with_client_plugin(plugin);
}
self
}
/// Adds a client-level runtime plugin.
pub fn with_client_plugin(mut self, plugin: impl RuntimePlugin + 'static) -> Self {
insert_plugin!(
self.client_plugins,
IntoShared::<SharedRuntimePlugin>::into_shared(plugin)
);
self
}
/// Add several operation-level runtime plugins from an iterator.
pub fn with_operation_plugins(
mut self,
plugins: impl IntoIterator<Item = SharedRuntimePlugin>,
) -> Self {
for plugin in plugins.into_iter() {
self = self.with_operation_plugin(plugin);
}
self
}
/// Adds an operation-level runtime plugin.
pub fn with_operation_plugin(mut self, plugin: impl RuntimePlugin + 'static) -> Self {
insert_plugin!(
self.operation_plugins,
IntoShared::<SharedRuntimePlugin>::into_shared(plugin)
);
self
}
/// Apply the client-level runtime plugins' config to the given config bag.
pub fn apply_client_configuration(
&self,
cfg: &mut ConfigBag,
) -> Result<RuntimeComponentsBuilder, BoxError> {
apply_plugins!(client, self.client_plugins, cfg)
}
/// Apply the operation-level runtime plugins' config to the given config bag.
pub fn apply_operation_configuration(
&self,
cfg: &mut ConfigBag,
) -> Result<RuntimeComponentsBuilder, BoxError> {
apply_plugins!(operation, self.operation_plugins, cfg)
}
}
#[cfg(all(test, feature = "test-util", feature = "http-02x"))]
mod tests {
use super::{RuntimePlugin, RuntimePlugins};
use crate::client::http::{
http_client_fn, HttpClient, HttpConnector, HttpConnectorFuture, SharedHttpConnector,
};
use crate::client::orchestrator::HttpRequest;
use crate::client::runtime_components::RuntimeComponentsBuilder;
use crate::client::runtime_plugin::{Order, SharedRuntimePlugin};
use crate::shared::IntoShared;
use aws_smithy_types::body::SdkBody;
use aws_smithy_types::config_bag::ConfigBag;
use http::HeaderValue;
use std::borrow::Cow;
#[derive(Debug)]
struct SomeStruct;
impl RuntimePlugin for SomeStruct {}
#[test]
fn can_add_runtime_plugin_implementors_to_runtime_plugins() {
RuntimePlugins::new().with_client_plugin(SomeStruct);
}
#[test]
fn runtime_plugins_are_send_sync() {
fn assert_send_sync<T: Send + Sync>() {}
assert_send_sync::<RuntimePlugins>();
}
#[test]
fn insert_plugin() {
#[derive(Debug)]
struct RP(isize, Order);
impl RuntimePlugin for RP {
fn order(&self) -> Order {
self.1
}
}
fn insert_plugin(vec: &mut Vec<RP>, plugin: RP) {
insert_plugin!(vec, plugin);
}
let mut vec = Vec::new();
insert_plugin(&mut vec, RP(5, Order::NestedComponents));
insert_plugin(&mut vec, RP(3, Order::Overrides));
insert_plugin(&mut vec, RP(1, Order::Defaults));
insert_plugin(&mut vec, RP(6, Order::NestedComponents));
insert_plugin(&mut vec, RP(2, Order::Defaults));
insert_plugin(&mut vec, RP(4, Order::Overrides));
insert_plugin(&mut vec, RP(7, Order::NestedComponents));
assert_eq!(
vec![1, 2, 3, 4, 5, 6, 7],
vec.iter().map(|rp| rp.0).collect::<Vec<isize>>()
);
let mut vec = Vec::new();
insert_plugin(&mut vec, RP(3, Order::Overrides));
insert_plugin(&mut vec, RP(4, Order::Overrides));
insert_plugin(&mut vec, RP(5, Order::NestedComponents));
insert_plugin(&mut vec, RP(6, Order::NestedComponents));
insert_plugin(&mut vec, RP(7, Order::NestedComponents));
insert_plugin(&mut vec, RP(1, Order::Defaults));
insert_plugin(&mut vec, RP(2, Order::Defaults));
assert_eq!(
vec![1, 2, 3, 4, 5, 6, 7],
vec.iter().map(|rp| rp.0).collect::<Vec<isize>>()
);
let mut vec = Vec::new();
insert_plugin(&mut vec, RP(1, Order::Defaults));
insert_plugin(&mut vec, RP(2, Order::Defaults));
insert_plugin(&mut vec, RP(3, Order::Overrides));
insert_plugin(&mut vec, RP(4, Order::Overrides));
insert_plugin(&mut vec, RP(5, Order::NestedComponents));
insert_plugin(&mut vec, RP(6, Order::NestedComponents));
assert_eq!(
vec![1, 2, 3, 4, 5, 6],
vec.iter().map(|rp| rp.0).collect::<Vec<isize>>()
);
}
#[tokio::test]
async fn components_can_wrap_components() {
// Connector1, the inner connector, creates a response with a `rp1` header
#[derive(Debug)]
struct Connector1;
impl HttpConnector for Connector1 {
fn call(&self, _: HttpRequest) -> HttpConnectorFuture {
HttpConnectorFuture::new(async {
Ok(http::Response::builder()
.status(200)
.header("rp1", "1")
.body(SdkBody::empty())
.unwrap()
.try_into()
.unwrap())
})
}
}
// Connector2, the outer connector, calls the inner connector and adds the `rp2` header to the response
#[derive(Debug)]
struct Connector2(SharedHttpConnector);
impl HttpConnector for Connector2 {
fn call(&self, request: HttpRequest) -> HttpConnectorFuture {
let inner = self.0.clone();
HttpConnectorFuture::new(async move {
let mut resp = inner.call(request).await.unwrap();
resp.headers_mut()
.append("rp2", HeaderValue::from_static("1"));
Ok(resp)
})
}
}
// Plugin1 registers Connector1
#[derive(Debug)]
struct Plugin1;
impl RuntimePlugin for Plugin1 {
fn order(&self) -> Order {
Order::Overrides
}
fn runtime_components(
&self,
_: &RuntimeComponentsBuilder,
) -> Cow<'_, RuntimeComponentsBuilder> {
Cow::Owned(
RuntimeComponentsBuilder::new("Plugin1")
.with_http_client(Some(http_client_fn(|_, _| Connector1.into_shared()))),
)
}
}
// Plugin2 registers Connector2
#[derive(Debug)]
struct Plugin2;
impl RuntimePlugin for Plugin2 {
fn order(&self) -> Order {
Order::NestedComponents
}
fn runtime_components(
&self,
current_components: &RuntimeComponentsBuilder,
) -> Cow<'_, RuntimeComponentsBuilder> {
let current = current_components.http_client().unwrap();
Cow::Owned(
RuntimeComponentsBuilder::new("Plugin2").with_http_client(Some(
http_client_fn(move |settings, components| {
let connector = current.http_connector(settings, components);
SharedHttpConnector::new(Connector2(connector))
}),
)),
)
}
}
// Emulate assembling a full runtime plugins list and using it to apply configuration
let plugins = RuntimePlugins::new()
// intentionally configure the plugins in the reverse order
.with_client_plugin(Plugin2)
.with_client_plugin(Plugin1);
let mut cfg = ConfigBag::base();
let components = plugins.apply_client_configuration(&mut cfg).unwrap();
let fake_components = RuntimeComponentsBuilder::for_tests().build().unwrap();
// Use the resulting HTTP connector to make a response
let resp = components
.http_client()
.unwrap()
.http_connector(&Default::default(), &fake_components)
.call(HttpRequest::empty())
.await
.unwrap();
dbg!(&resp);
// Verify headers from both connectors are present,
// which will only be possible if they were run in the correct order
assert_eq!("1", resp.headers().get("rp1").unwrap());
assert_eq!("1", resp.headers().get("rp2").unwrap());
}
#[test]
fn shared_runtime_plugin_new_specialization() {
#[derive(Debug)]
struct RP;
impl RuntimePlugin for RP {}
use crate::shared::IntoShared;
let shared1 = SharedRuntimePlugin::new(RP);
let shared2: SharedRuntimePlugin = shared1.clone().into_shared();
assert_eq!(
"SharedRuntimePlugin(RP)",
format!("{shared1:?}"),
"precondition: RP shows up in the debug format"
);
assert_eq!(
format!("{shared1:?}"),
format!("{shared2:?}"),
"it should not nest the shared runtime plugins"
);
}
}