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Copy pathfilter.rs
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414 lines (352 loc) · 13.6 KB
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use proxy_wasm::{traits::*, types::*};
use std::rc::Rc;
mod config;
mod data;
mod debug;
mod dependency_graph;
mod nodes;
use crate::config::Config;
use crate::data::{Data, Input, Payload, Phase, Phase::*, State};
use crate::debug::{Debug, RunMode};
use crate::dependency_graph::DependencyGraph;
use crate::nodes::{Node, NodeMap};
// -----------------------------------------------------------------------------
// 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) {
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_headers");
let do_request_body = graph.has_dependents("request_body");
let do_service_request_headers = graph.has_providers("service_request_headers");
let do_service_request_body = graph.has_providers("service_request_body");
let do_service_response_headers = graph.has_dependents("service_response_headers");
let do_service_response_body = graph.has_dependents("service_re
10BC8
sponse_body");
let do_response_headers = graph.has_providers("response_headers");
let do_response_body = graph.has_providers("response_body");
Some(Box::new(DataKitFilter {
config,
nodes,
debug,
data,
failed: false,
do_request_headers,
do_request_body,
do_service_request_headers,
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: NodeMap,
data: Data,
debug: Option<Debug>,
failed: bool,
do_request_headers: bool,
do_request_body: bool,
do_service_request_headers: 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 = data::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_data(&mut self, name: &str, state: State) {
if let Some(ref mut debug) = self.debug {
debug.set_data(name, &state);
}
self.data.set(name, state);
}
fn set_headers_data(&mut self, vec: Vec<(String, String)>, name: &str) {
let payload = data::from_pwm_headers(vec);
self.set_data(name, State::Done(Some(payload)));
}
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();
}
while !self.failed {
let mut any_ran = false;
for name in self.config.get_node_names() {
let node: &dyn Node = self
.nodes
.get(name)
.expect("self.nodes doesn't match self.node_names")
.as_ref();
if let Some(inputs) = self.data.get_inputs_for(name, None) {
any_ran = true;
let input = Input {
data: &inputs,
phase,
};
let state = node.run(self as &dyn HttpContext, &input);
if let Some(ref mut debug) = self.debug {
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(name, state);
}
}
if !any_ran {
break;
}
}
ret
}
fn set_service_request_headers(&mut self) {
if self.do_service_request_headers {
if let Some(payload) = self.data.first_input_for("service_request_headers", None) {
let headers = data::to_pwm_headers(Some(payload));
self.set_http_request_headers(headers);
self.do_service_request_headers = false;
}
}
}
fn set_service_request_body(&mut self) {
if self.do_service_request_body {
if let Some(payload) = self.data.first_input_for("service_request_body", None) {
if let Ok(bytes) = payload.to_bytes() {
self.set_http_request_body(0, bytes.len(), &bytes);
}
self.do_service_request_body = false;
}
}
}
}
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);
for name in self.config.get_node_names() {
let node: &dyn Node = self
.nodes
.get(name)
.expect("self.nodes doesn't match self.node_names")
.as_ref();
if let Some(inputs) = self.data.get_inputs_for(name, Some(token_id)) {
let input = Input {
data: &inputs,
phase: HttpCallResponse,
};
let state = node.resume(self, &input);
if let Some(ref mut debug) = self.debug {
debug.run(name, &inputs, &state, RunMode::Resume);
}
self.data.set(name, state);
break;
}
}
self.run_nodes(HttpCallResponse);
self.set_service_request_headers();
// self.set_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 {
let vec = self.get_http_request_headers();
self.set_headers_data(vec, "request_headers");
}
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.set_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");
let body_payload = Payload::from_bytes(bytes, content_type.as_deref());
self.set_data("request_body", State::Done(body_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(vec, "service_response_headers");
}
let action = self.run_nodes(HttpResponseHeaders);
if self.do_response_headers {
if let Some(payload) = self.data.first_input_for("response_headers", None) {
let headers = data::to_pwm_headers(Some(payload));
self.set_http_response_headers(headers);
}
}
if self.do_response_body {
if let Some(payload) = self.data.first_input_for("response_body", None) {
let content_length = payload.len().map(|n| n.to_string());
self.set_http_response_header("Content-Length", content_length.as_deref());
self.set_http_response_header("Content-Type", payload.content_type());
} else {
self.set_http_response_header("Content-Length", None);
}
self.set_http_response_header("Content-Encoding", None);
}
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");
let payload = Payload::from_bytes(bytes, content_type.as_deref());
self.set_data("service_response_body", State::Done(payload));
}
}
let action = self.run_nodes(HttpResponseBody);
if self.do_response_body {
if let Some(payload) = self.data.first_input_for("response_body", None) {
if let Ok(bytes) = payload.to_bytes() {
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();
let payload = Payload::from_bytes(bytes, content_type.as_deref());
self.set_data("response_body", State::Done(payload));
}
}
}
if self.debug.is_some() {
self.debug_done()
}
action
}
}
proxy_wasm::main! {{
nodes::register_node("template", Box::new(nodes::template::TemplateFactory {}));
nodes::register_node("call", Box::new(nodes::call::CallFactory {}));
nodes::register_node("response", Box::new(nodes::response::ResponseFactory {}));
nodes::register_node("jq", Box::new(nodes::jq::JqFactory {}));
proxy_wasm::set_log_level(LogLevel::Debug);
proxy_wasm::set_root_context(|_| -> Box<dyn RootContext> {
Box::new(DataKitFilterRootContext {
config: None,
})
});
}}