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Copy pathfilter.rs
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578 lines (489 loc) · 19 KB
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use lazy_static::lazy_static;
use payload::URLENCODED_CONTENT_TYPE;
use proxy_wasm::{traits::*, types::*};
use std::rc::Rc;
mod config;
mod data;
mod debug;
mod dependency_graph;
mod nodes;
mod payload;
use crate::config::{Config, ImplicitNode};
use crate::data::{Data, Input, Phase, Phase::*, State};
use crate::debug::{Debug, RunMode};
use crate::dependency_graph::DependencyGraph;
use crate::nodes::{Node, NodeVec, PortConfig};
use crate::payload::Payload;
use crate::ImplicitNodeId::*;
use crate::ImplicitPortId::*;
// -----------------------------------------------------------------------------
// Implicit nodes
// -----------------------------------------------------------------------------
#[derive(Copy, Clone)]
enum ImplicitNodeId {
Request = 0,
ServiceRequest = 1,
ServiceResponse = 2,
Response = 3,
}
impl From<ImplicitNodeId> for usize {
fn from(n: ImplicitNodeId) -> Self {
n as usize
}
}
#[derive(Copy, Clone)]
enum ImplicitPortId {
Body = 0,
Headers = 1,
Query = 2,
}
impl From<ImplicitPortId> for usize {
fn from(p: ImplicitPortId) -> Self {
p as usize
}
}
lazy_static! {
static ref REQ_PORTS: Vec<String> = PortConfig::names(&["body", "headers", "query"]);
static ref RESP_PORTS: Vec<String> = PortConfig::names(&["body", "headers"]);
static ref IMPLICIT_NODES: Vec<ImplicitNode> = vec![
ImplicitNode::new("request", vec![], REQ_PORTS.clone()),
ImplicitNode::new("service_request", REQ_PORTS.clone(), RESP_PORTS.clone()),
ImplicitNode::new("service_response", vec![], RESP_PORTS.clone()),
ImplicitNode::new("response", RESP_PORTS.clone(), RESP_PORTS.clone()),
];
}
// -----------------------------------------------------------------------------
// Root Context
// -----------------------------------------------------------------------------
struct DataKitFilterRootContext {
config: Option<Rc<Config>>,
}
impl Context for DataKitFilterRootContext {}
impl RootContext for DataKitFilterRootContext {
fn on_configure(&mut self, _config_size: usize) -> bool {
match self.get_plugin_configuration() {
Some(config_bytes) => match Config::new(config_bytes, &IMPLICIT_NODES) {
Ok(config) => {
self.config = Some(Rc::new(config));
true
}
Err(err) => {
log::warn!("on_configure: {err}");
false
}
},
None => {
log::warn!("on_configure: failed getting configuration");
false
}
}
}
fn get_type(&self) -> Option<ContextType> {
Some(ContextType::HttpContext)
}
fn create_http_context(&self, context_id: u32) -> Option<Box<dyn HttpContext>> {
log::debug!("DataKitFilterRootContext: create http context id: {context_id}");
let config = self.config.clone()?;
let nodes = config.build_nodes();
let graph = config.get_graph();
let debug = config.debug().then(|| Debug::new(&config));
// FIXME: is it possible to do lifetime annotations
// to avoid cloning every time?
let data = Data::new(graph.clone());
let do_request_headers = graph.has_dependents(Request.into(), Headers.into());
let do_request_query = graph.has_dependents(Request.into(), Query.into());
let do_request_body = graph.has_dependents(Request.into(), Body.into());
let do_service_request_headers = graph.has_provider(ServiceRequest.into(), Headers.into());
let do_service_request_query = graph.has_provider(ServiceRequest.into(), Query.into());
let do_service_request_body = graph.has_provider(ServiceRequest.into(), Body.into());
let do_service_response_headers =
graph.has_dependents(ServiceResponse.into(), Headers.into());
let do_service_response_body = graph.has_dependents(ServiceResponse.into(), Body.into());
let do_response_headers = graph.has_provider(Response.into(), Headers.into());
let do_response_body = graph.has_provider(Response.into(), Body.into());
Some(Box::new(DataKitFilter {
config,
nodes,
debug,
data,
failed: false,
do_request_headers,
do_request_query,
do_request_body,
do_service_request_headers,
do_service_request_query,
do_service_request_body,
do_service_response_headers,
do_service_response_body,
do_response_headers,
do_response_body,
}))
}
}
// -----------------------------------------------------------------------------
// Filter Context
// -----------------------------------------------------------------------------
pub struct DataKitFilter {
config: Rc<Config>,
nodes: NodeVec,
data: Data,
debug: Option<Debug>,
failed: bool,
do_request_headers: bool,
do_request_query: bool,
do_request_body: bool,
do_service_request_headers: bool,
do_service_request_query: bool,
do_service_request_body: bool,
do_service_response_headers: bool,
do_service_response_body: bool,
do_response_headers: bool,
do_response_body: bool,
}
fn header_to_bool(header_value: &Option<String>) -> bool {
match header_value {
Some(val) => val != "off" && val != "false" && val != "0",
None => false,
}
}
impl DataKitFilter {
fn debug_init(&mut self) {
let trace_header = &self.get_http_request_header("X-DataKit-Debug-Trace");
if header_to_bool(trace_header) {
if let Some(ref mut debug) = self.debug {
debug.set_tracing(true);
}
self.do_response_body = true;
}
}
fn debug_done_headers(&mut self) {
let ct = self.get_http_response_header("Content-Type");
if let Some(ref mut debug) = self.debug {
if debug.is_tracing() {
debug.save_response_body_content_type(ct);
self.set_http_response_header("Content-Type", Some("application/json"));
self.set_http_response_header("Content-Length", None);
self.set_http_response_header("Content-Encoding", None);
}
}
}
fn debug_done(&mut self) {
if let Some(ref mut debug) = self.debug {
if debug.is_tracing() {
let trace = debug.get_trace();
let bytes = trace.as_bytes();
self.set_http_response_body(0, bytes.len(), bytes);
}
}
}
fn send_default_fail_response(&self) {
let body = payload::to_json_error_body(
"An unexpected error ocurred",
self.get_property(vec!["ngx", "kong_request_id"]),
);
self.send_http_response(
500,
vec![("Content-Type", "application/json")],
Some(&body.into_bytes()),
);
}
fn set_implicit_data(&mut self, node: ImplicitNodeId, port: ImplicitPortId, payload: Payload) {
let r = self.data.fill_port(node.into(), port.into(), payload);
match r {
Ok(()) => {
if let Some(debug) = &mut self.debug {
let name = self.config.get_node_name(node.into());
if let Ok(state) = self.data.get_state(node.into()) {
debug.set_data(name, state);
}
}
}
Err(e) => panic!("error setting implicit node data: {e}"),
}
}
fn set_headers_data(&mut self, node: ImplicitNodeId, vec: Vec<(String, String)>) {
let payload = payload::from_pwm_headers(vec);
self.set_implicit_data(node, Headers, payload);
}
fn set_query_data(&mut self, node: ImplicitNodeId, query: &str) {
if let Some(payload) =
Payload::from_bytes(query.as_bytes().to_vec(), Some(URLENCODED_CONTENT_TYPE))
{
self.set_implicit_data(node, Query, payload);
}
}
fn set_body_data(&mut self, node: ImplicitNodeId, payload: Payload) {
self.set_implicit_data(node, Body, payload);
}
fn get_headers_data(&self, node: ImplicitNodeId) -> Option<&Payload> {
self.data.fetch_port(node.into(), Headers.into())
}
fn get_query_data(&self, node: ImplicitNodeId) -> Option<&Payload> {
self.data.fetch_port(node.into(), Query.into())
}
fn get_body_data(&self, node: ImplicitNodeId) -> Option<&Payload> {
self.data.fetch_port(node.into(), Body.into())
}
fn run_nodes(&mut self, phase: Phase) -> Action {
let mut ret = Action::Continue;
let mut debug_is_tracing = false;
if let Some(ref mut debug) = self.debug {
debug_is_tracing = debug.is_tracing();
}
let from = self.config.number_of_implicits();
let to = self.config.node_count();
while !self.failed {
let mut any_ran = false;
for i in from..to {
let node: &dyn Node = self
.nodes
.get(i)
.expect("self.nodes doesn't match node_count")
.as_ref();
if let Some(inputs) = self.data.get_inputs_for(i, None) {
any_ran = true;
let input = Input {
data: &inputs,
phase,
};
log::debug!(
"running node {} of type {}",
self.config.get_node_name(i),
self.config.get_node_type(i)
);
let state = node.run(self as &dyn HttpContext, &input);
if let Some(ref mut debug) = self.debug {
let name = self.config.get_node_name(i);
debug.run(name, &inputs, &state, RunMode::Run);
}
match state {
State::Done(_) => {}
State::Waiting(_) => {
ret = Action::Pause;
}
State::Fail(_) => {
self.failed = true;
if !debug_is_tracing {
self.send_default_fail_response();
}
}
}
self.data.set(i, state);
}
}
if !any_ran {
break;
}
}
ret
}
fn set_service_request_headers(&mut self) {
if self.do_service_request_headers {
if let Some(payload) = self.get_headers_data(ServiceRequest) {
self.set_http_request_headers(payload::to_pwm_headers(Some(payload)));
self.do_service_request_headers = false;
}
}
if self.do_service_request_query {
if let Some(qpayload) = self.get_query_data(ServiceRequest) {
if let Some(path) = self.get_http_request_header(":path") {
let pq: String = update_query_in_path(&path, qpayload);
self.set_http_request_header(":path", Some(&pq));
}
self.do_service_request_query = false;
}
}
}
fn set_content_headers(
&self,
node: ImplicitNodeId,
set_header: impl Fn(&DataKitFilter, &str, Option<&str>),
) {
if let Some(payload) = self.get_body_data(node) {
if let Some(content_type) = payload.content_type() {
set_header(self, "Content-Type", Some(content_type));
}
if let Some(content_length) = payload.len().map(|n| n.to_string()) {
set_header(self, "Content-Length", Some(&content_length));
} else {
set_header(self, "Content-Length", None);
}
} else {
set_header(self, "Content-Length", None);
}
set_header(self, "Content-Encoding", None);
}
fn prep_service_request_body(&mut self) {
if self.do_service_request_body {
self.set_content_headers(ServiceRequest, |s, k, v| s.set_http_request_header(k, v));
}
}
fn set_service_request_body(&mut self) {
if self.do_service_request_body {
if let Some(payload) = self.get_body_data(ServiceRequest) {
let content_type = self.get_http_request_header("Content-Type");
if let Ok(bytes) = payload.to_bytes(content_type.as_deref()) {
self.set_http_request_body(0, bytes.len(), &bytes);
}
self.do_service_request_body = false;
}
}
}
}
fn update_query_in_path(path: &str, qpayload: &Payload) -> String {
(path.split_once('?').map_or(path.as_ref(), |t| t.0)).to_owned()
+ "?"
+ &qpayload.to_pwm_query()
}
impl Context for DataKitFilter {
fn on_http_call_response(
&mut self,
token_id: u32,
_nheaders: usize,
_body_size: usize,
_num_trailers: usize,
) {
log::debug!("DataKitFilter: on http call response, id = {:?}", token_id);
let from = self.config.number_of_implicits();
let to = self.config.node_count();
for i in from..to {
let node: &dyn Node = self
.nodes
.get(i)
.expect("self.nodes doesn't match node_count")
.as_ref();
if let Some(inputs) = self.data.get_inputs_for(i, Some(token_id)) {
let input = Input {
data: &inputs,
phase: HttpCallResponse,
};
log::debug!(
"resuming node {} of type {}",
self.config.get_node_name(i),
self.config.get_node_type(i)
);
let state = node.resume(self, &input);
if let Some(ref mut debug) = self.debug {
let name = self.config.get_node_name(i);
debug.run(name, &inputs, &state, RunMode::Resume);
}
self.data.set(i, state);
break;
}
}
self.run_nodes(HttpCallResponse);
self.set_service_request_headers();
self.prep_service_request_body();
self.resume_http_request();
}
}
impl HttpContext for DataKitFilter {
fn on_http_request_headers(&mut self, _nheaders: usize, _eof: bool) -> Action {
if self.debug.is_some() {
self.debug_init()
}
if self.do_request_headers {
self.set_headers_data(Request, self.get_http_request_headers());
}
if self.do_request_query {
if let Some(path) = self.get_http_request_header(":path") {
let q = path.split_once('?').map_or("", |t| t.1);
self.set_query_data(Request, q);
}
}
let action = self.run_nodes(HttpRequestHeaders);
if self.get_http_request_header("Content-Length").is_none()
&& self.get_http_request_header("Transfer-Encoding").is_none()
{
self.set_service_request_headers();
}
self.prep_service_request_body();
action
}
fn on_http_request_body(&mut self, body_size: usize, eof: bool) -> Action {
if eof && self.do_request_body {
if let Some(bytes) = self.get_http_request_body(0, body_size) {
let content_type = self.get_http_request_header("Content-Type");
if let Some(payload) = Payload::from_bytes(bytes, content_type.as_deref()) {
self.set_body_data(Request, payload);
}
}
}
let action = self.run_nodes(HttpRequestBody);
self.set_service_request_headers();
self.set_service_request_body();
action
}
fn on_http_response_headers(&mut self, _nheaders: usize, _eof: bool) -> Action {
if self.do_service_response_headers {
let vec = self.get_http_response_headers();
self.set_headers_data(ServiceResponse, vec);
}
let action = self.run_nodes(HttpResponseHeaders);
if self.do_response_headers {
if let Some(payload) = self.get_headers_data(Response) {
let headers = payload::to_pwm_headers(Some(payload));
self.set_http_response_headers(headers);
}
}
if self.do_response_body {
self.set_content_headers(Response, |s, k, v| s.set_http_response_header(k, v));
}
if self.debug.is_some() {
self.debug_done_headers()
}
action
}
fn on_http_response_body(&mut self, body_size: usize, eof: bool) -> Action {
if !eof {
return Action::Pause;
}
if eof && self.do_service_response_body {
if let Some(bytes) = self.get_http_response_body(0, body_size) {
let content_type = self.get_http_response_header("Content-Type");
if let Some(payload) = Payload::from_bytes(bytes, content_type.as_deref()) {
self.set_body_data(ServiceResponse, payload);
}
}
}
let action = self.run_nodes(HttpResponseBody);
if self.do_response_body {
if let Some(payload) = self.get_body_data(Response) {
let content_type = self.get_http_response_header("Content-Type");
if let Ok(bytes) = payload.to_bytes(content_type.as_deref()) {
self.set_http_response_body(0, bytes.len(), &bytes);
} else {
self.set_http_response_body(0, 0, &[]);
}
} else if let Some(debug) = &self.debug {
if let Some(bytes) = self.get_http_response_body(0, body_size) {
let content_type = debug.response_body_content_type();
if let Some(payload) = Payload::from_bytes(bytes, content_type.as_deref()) {
self.set_body_data(Response, payload);
}
}
}
}
if self.debug.is_some() {
self.debug_done()
}
action
}
}
proxy_wasm::main! {{
nodes::register_node("implicit", Box::new(nodes::implicit::ImplicitFactory {}));
nodes::register_node("handlebars", Box::new(nodes::handlebars::HandlebarsFactory {}));
nodes::register_node("call", Box::new(nodes::call::CallFactory {}));
nodes::register_node("exit", Box::new(nodes::exit::ExitFactory {}));
nodes::register_node("jq", Box::new(nodes::jq::JqFactory {}));
nodes::register_node("property", Box::new(nodes::property::PropertyFactory {}));
proxy_wasm::set_log_level(LogLevel::Debug);
proxy_wasm::set_root_context(|_| -> Box<dyn RootContext> {
Box::new(DataKitFilterRootContext {
config: None,
})
});
}}
// interesting tests to try out:
// multiple callouts at once with different settings: http 1.0, 1.1, chunked encoding, content-length
// test with bad responses