2021-03-20 11:42:00 +00:00
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use std::collections::HashMap;
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use async_graphql_parser::types::ExecutableDocument;
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use async_graphql_value::Variables;
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use opentelemetry::trace::{SpanKind, TraceContextExt, Tracer};
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use opentelemetry::{Context as OpenTelemetryContext, Key, KeyValue};
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use crate::extensions::{Extension, ExtensionContext, ExtensionFactory, ResolveInfo};
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use crate::{ServerError, ValidationResult};
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const REQUEST_CTX: usize = 0;
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const PARSE_CTX: usize = 1;
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const VALIDATION_CTX: usize = 2;
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const EXECUTE_CTX: usize = 3;
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#[inline]
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fn resolve_ctx_id(resolver_id: usize) -> usize {
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resolver_id + 10
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}
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const KEY_SOURCE: Key = Key::from_static_str("graphql.source");
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const KEY_VARIABLES: Key = Key::from_static_str("graphql.variables");
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const KEY_PARENT_TYPE: Key = Key::from_static_str("graphql.parentType");
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const KEY_RETURN_TYPE: Key = Key::from_static_str("graphql.returnType");
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const KEY_RESOLVE_ID: Key = Key::from_static_str("graphql.resolveId");
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const KEY_ERROR: Key = Key::from_static_str("graphql.error");
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const KEY_COMPLEXITY: Key = Key::from_static_str("graphql.complexity");
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const KEY_DEPTH: Key = Key::from_static_str("graphql.depth");
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/// OpenTelemetry extension
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#[derive(Default)]
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2021-03-22 05:27:24 +00:00
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#[cfg_attr(docsrs, doc(cfg(feature = "opentelemetry")))]
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2021-03-20 11:42:00 +00:00
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pub struct OpenTelemetry<T, U> {
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tracer: T,
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#[allow(dead_code)]
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uninstall: U,
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}
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impl<T> OpenTelemetry<T, ()> {
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/// Use `tracer` to create an OpenTelemetry extension.
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pub fn new(tracer: T) -> OpenTelemetry<T, ()>
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where
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T: Tracer + Send + Sync + Clone,
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{
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Self {
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tracer,
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uninstall: (),
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}
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}
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/// Attach an Uninstall instance to this extension.
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pub fn with_uninstall<U>(self, uninstall: U) -> OpenTelemetry<T, U>
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where
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U: Send + Sync + 'static,
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{
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OpenTelemetry {
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tracer: self.tracer,
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uninstall,
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}
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}
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}
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impl<T: Tracer + Send + Sync + Clone, U: Send + Sync + 'static> ExtensionFactory
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for OpenTelemetry<T, U>
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{
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fn create(&self) -> Box<dyn Extension> {
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Box::new(OpenTelemetryExtension {
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tracer: self.tracer.clone(),
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contexts: Default::default(),
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})
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}
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}
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struct OpenTelemetryExtension<T> {
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tracer: T,
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contexts: HashMap<usize, OpenTelemetryContext>,
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}
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impl<T> OpenTelemetryExtension<T> {
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fn enter_context(&mut self, id: usize, cx: OpenTelemetryContext) {
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let _ = cx.clone().attach();
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self.contexts.insert(id, cx);
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}
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fn exit_context(&mut self, id: usize) -> Option<OpenTelemetryContext> {
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if let Some(cx) = self.contexts.remove(&id) {
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let _ = cx.clone().attach();
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Some(cx)
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} else {
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None
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}
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}
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}
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impl<T: Tracer + Send + Sync + Clone> Extension for OpenTelemetryExtension<T> {
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fn parse_start(
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&mut self,
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_ctx: &ExtensionContext<'_>,
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query_source: &str,
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variables: &Variables,
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) {
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let request_span = self
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.tracer
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.span_builder("request")
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.with_kind(SpanKind::Server)
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.start(&self.tracer);
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let request_cx = OpenTelemetryContext::current_with_span(request_span);
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self.enter_context(REQUEST_CTX, request_cx.clone());
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let mut attributes = Vec::with_capacity(2);
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attributes.push(KeyValue::new(KEY_SOURCE, query_source.to_string()));
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attributes.push(KeyValue::new(
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KEY_VARIABLES,
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serde_json::to_string(variables).unwrap(),
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));
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let parse_span = self
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.tracer
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.span_builder("parse")
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.with_kind(SpanKind::Server)
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.with_attributes(attributes)
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.with_parent_context(request_cx)
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.start(&self.tracer);
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let parse_cx = OpenTelemetryContext::current_with_span(parse_span);
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self.enter_context(PARSE_CTX, parse_cx);
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}
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fn parse_end(&mut self, _ctx: &ExtensionContext<'_>, _document: &ExecutableDocument) {
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self.exit_context(PARSE_CTX);
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}
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fn validation_start(&mut self, _ctx: &ExtensionContext<'_>) {
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if let Some(parent_cx) = self.contexts.get(&REQUEST_CTX).cloned() {
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let span = self
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.tracer
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.span_builder("validation")
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.with_kind(SpanKind::Server)
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.with_parent_context(parent_cx)
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.start(&self.tracer);
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let validation_cx = OpenTelemetryContext::current_with_span(span);
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self.enter_context(VALIDATION_CTX, validation_cx);
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}
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}
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fn validation_end(&mut self, _ctx: &ExtensionContext<'_>, result: &ValidationResult) {
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if let Some(validation_cx) = self.exit_context(VALIDATION_CTX) {
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let span = validation_cx.span();
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span.set_attribute(KeyValue::new(KEY_COMPLEXITY, result.complexity as i64));
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span.set_attribute(KeyValue::new(KEY_DEPTH, result.depth as i64));
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}
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}
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fn execution_start(&mut self, _ctx: &ExtensionContext<'_>) {
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let span = match self.contexts.get(&REQUEST_CTX).cloned() {
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Some(parent_cx) => self
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.tracer
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.span_builder("execute")
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.with_kind(SpanKind::Server)
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.with_parent_context(parent_cx)
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.start(&self.tracer),
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None => self
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.tracer
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.span_builder("execute")
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.with_kind(SpanKind::Server)
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.start(&self.tracer),
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};
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let execute_cx = OpenTelemetryContext::current_with_span(span);
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self.enter_context(EXECUTE_CTX, execute_cx);
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}
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fn execution_end(&mut self, _ctx: &ExtensionContext<'_>) {
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self.exit_context(EXECUTE_CTX);
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self.exit_context(REQUEST_CTX);
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}
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fn resolve_start(&mut self, _ctx: &ExtensionContext<'_>, info: &ResolveInfo<'_>) {
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let parent_cx = match info.resolve_id.parent {
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Some(parent_id) if parent_id > 0 => self.contexts.get(&resolve_ctx_id(parent_id)),
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_ => self.contexts.get(&EXECUTE_CTX),
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}
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.cloned();
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if let Some(parent_cx) = parent_cx {
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let mut attributes = Vec::with_capacity(3);
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attributes.push(KeyValue::new(
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KEY_RESOLVE_ID,
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info.resolve_id.current as i64,
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));
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attributes.push(KeyValue::new(KEY_PARENT_TYPE, info.parent_type.to_string()));
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attributes.push(KeyValue::new(KEY_RETURN_TYPE, info.return_type.to_string()));
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let span = self
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.tracer
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.span_builder(&info.path_node.to_string())
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.with_kind(SpanKind::Server)
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.with_parent_context(parent_cx)
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.with_attributes(attributes)
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.start(&self.tracer);
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let resolve_cx = OpenTelemetryContext::current_with_span(span);
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self.enter_context(resolve_ctx_id(info.resolve_id.current), resolve_cx);
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}
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}
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fn resolve_end(&mut self, _ctx: &ExtensionContext<'_>, info: &ResolveInfo<'_>) {
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self.exit_context(resolve_ctx_id(info.resolve_id.current));
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}
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fn error(&mut self, _ctx: &ExtensionContext<'_>, err: &ServerError) {
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if let Some(parent_cx) = self.contexts.get(&EXECUTE_CTX).cloned() {
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parent_cx.span().add_event(
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"error".to_string(),
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vec![KeyValue::new(KEY_ERROR, err.to_string())],
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);
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}
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}
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}
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