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config.rs
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config.rs
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//! Configuration for the telemetry plugin.
use std::collections::BTreeMap;
use std::collections::HashSet;
use axum::headers::HeaderName;
use opentelemetry::sdk::metrics::new_view;
use opentelemetry::sdk::metrics::Aggregation;
use opentelemetry::sdk::metrics::Instrument;
use opentelemetry::sdk::metrics::Stream;
use opentelemetry::sdk::metrics::View;
use opentelemetry::sdk::trace::SpanLimits;
use opentelemetry::Array;
use opentelemetry::Value;
use opentelemetry_api::metrics::MetricsError;
use opentelemetry_api::metrics::Unit;
use schemars::JsonSchema;
use serde::Deserialize;
use serde::Serialize;
use super::metrics::MetricsAttributesConf;
use super::*;
use crate::plugin::serde::deserialize_option_header_name;
use crate::plugins::telemetry::metrics;
use crate::plugins::telemetry::resource::ConfigResource;
#[derive(thiserror::Error, Debug)]
pub(crate) enum Error {
#[error("field level instrumentation sampler must sample less frequently than tracing level sampler")]
InvalidFieldLevelInstrumentationSampler,
}
pub(in crate::plugins::telemetry) trait GenericWith<T>
where
Self: Sized,
{
fn with<B>(self, option: &Option<B>, apply: fn(Self, &B) -> Self) -> Self {
if let Some(option) = option {
return apply(self, option);
}
self
}
fn try_with<B>(
self,
option: &Option<B>,
apply: fn(Self, &B) -> Result<Self, BoxError>,
) -> Result<Self, BoxError> {
if let Some(option) = option {
return apply(self, option);
}
Ok(self)
}
}
impl<T> GenericWith<T> for T where Self: Sized {}
/// Telemetry configuration
#[derive(Clone, Default, Debug, Deserialize, JsonSchema)]
#[serde(deny_unknown_fields, default)]
pub(crate) struct Conf {
/// Apollo reporting configuration
pub(crate) apollo: apollo::Config,
/// Instrumentation configuration
pub(crate) exporters: Exporters,
/// Instrumentation configuration
pub(crate) instrumentation: Instrumentation,
}
/// Exporter configuration
#[derive(Clone, Default, Debug, Deserialize, JsonSchema)]
#[serde(deny_unknown_fields, default)]
pub(crate) struct Exporters {
/// Logging configuration
pub(crate) logging: config_new::logging::Logging,
/// Metrics configuration
pub(crate) metrics: Metrics,
/// Tracing configuration
pub(crate) tracing: Tracing,
}
/// Instrumentation configuration
#[derive(Clone, Default, Debug, Deserialize, JsonSchema)]
#[serde(deny_unknown_fields, default)]
pub(crate) struct Instrumentation {
#[serde(skip)]
/// Event configuration
pub(crate) events: config_new::events::Events,
/// Span configuration
pub(crate) spans: config_new::spans::Spans,
/// Instrument configuration
pub(crate) instruments: config_new::instruments::InstrumentsConfig,
}
/// Metrics configuration
#[derive(Clone, Default, Debug, Deserialize, JsonSchema)]
#[serde(deny_unknown_fields, default)]
pub(crate) struct Metrics {
/// Common metrics configuration across all exporters
pub(crate) common: MetricsCommon,
/// Open Telemetry native exporter configuration
pub(crate) otlp: otlp::Config,
/// Prometheus exporter configuration
pub(crate) prometheus: metrics::prometheus::Config,
}
#[derive(Clone, Debug, Deserialize, JsonSchema)]
#[serde(deny_unknown_fields, default)]
pub(crate) struct MetricsCommon {
/// Configuration to add custom labels/attributes to metrics
pub(crate) attributes: MetricsAttributesConf,
/// Set a service.name resource in your metrics
pub(crate) service_name: Option<String>,
/// Set a service.namespace attribute in your metrics
pub(crate) service_namespace: Option<String>,
/// The Open Telemetry resource
pub(crate) resource: BTreeMap<String, AttributeValue>,
/// Custom buckets for all histograms
pub(crate) buckets: Vec<f64>,
/// Views applied on metrics
pub(crate) views: Vec<MetricView>,
}
impl Default for MetricsCommon {
fn default() -> Self {
Self {
attributes: Default::default(),
service_name: None,
service_namespace: None,
resource: BTreeMap::new(),
views: Vec::with_capacity(0),
buckets: vec![
0.001, 0.005, 0.015, 0.05, 0.1, 0.2, 0.3, 0.4, 0.5, 1.0, 5.0, 10.0,
],
}
}
}
#[derive(Clone, Debug, Deserialize, JsonSchema, PartialEq)]
#[serde(deny_unknown_fields)]
pub(crate) struct MetricView {
/// The instrument name you're targeting
pub(crate) name: String,
/// New description to set to the instrument
pub(crate) description: Option<String>,
/// New unit to set to the instrument
pub(crate) unit: Option<String>,
/// New aggregation settings to set
pub(crate) aggregation: Option<MetricAggregation>,
/// An allow-list of attribute keys that will be preserved for the instrument.
///
/// Any attribute recorded for the instrument with a key not in this set will be
/// dropped. If the set is empty, all attributes will be dropped, if `None` all
/// attributes will be kept.
pub(crate) allowed_attribute_keys: Option<HashSet<String>>,
}
impl TryInto<Box<dyn View>> for MetricView {
type Error = MetricsError;
fn try_into(self) -> Result<Box<dyn View>, Self::Error> {
let aggregation = self
.aggregation
.map(
|MetricAggregation::Histogram { buckets }| Aggregation::ExplicitBucketHistogram {
boundaries: buckets,
record_min_max: true,
},
);
let instrument = Instrument::new().name(self.name);
let mut mask = Stream::new();
if let Some(desc) = self.description {
mask = mask.description(desc);
}
if let Some(unit) = self.unit {
mask = mask.unit(Unit::new(unit));
}
if let Some(aggregation) = aggregation {
mask = mask.aggregation(aggregation);
}
if let Some(allowed_attribute_keys) = self.allowed_attribute_keys {
mask = mask.allowed_attribute_keys(allowed_attribute_keys.into_iter().map(Key::new));
}
new_view(instrument, mask)
}
}
#[derive(Clone, Debug, Deserialize, JsonSchema, PartialEq)]
#[serde(deny_unknown_fields, rename_all = "snake_case")]
pub(crate) enum MetricAggregation {
/// An aggregation that summarizes a set of measurements as an histogram with
/// explicitly defined buckets.
Histogram { buckets: Vec<f64> },
}
/// Tracing configuration
#[derive(Clone, Default, Debug, Deserialize, JsonSchema)]
#[serde(deny_unknown_fields, default)]
pub(crate) struct Tracing {
// TODO: when deleting the `experimental_` prefix, check the usage when enabling dev mode
// When deleting, put a #[serde(alias = "experimental_response_trace_id")] if we don't want to break things
/// A way to expose trace id in response headers
#[serde(default, rename = "experimental_response_trace_id")]
pub(crate) response_trace_id: ExposeTraceId,
/// Propagation configuration
pub(crate) propagation: Propagation,
/// Common configuration
pub(crate) common: TracingCommon,
/// OpenTelemetry native exporter configuration
pub(crate) otlp: otlp::Config,
/// Jaeger exporter configuration
pub(crate) jaeger: tracing::jaeger::Config,
/// Zipkin exporter configuration
pub(crate) zipkin: tracing::zipkin::Config,
/// Datadog exporter configuration
pub(crate) datadog: tracing::datadog::Config,
}
#[derive(Clone, Default, Debug, Deserialize, JsonSchema)]
#[serde(deny_unknown_fields, default)]
pub(crate) struct ExposeTraceId {
/// Expose the trace_id in response headers
pub(crate) enabled: bool,
/// Choose the header name to expose trace_id (default: apollo-trace-id)
#[schemars(with = "Option<String>")]
#[serde(deserialize_with = "deserialize_option_header_name")]
pub(crate) header_name: Option<HeaderName>,
/// Format of the trace ID in response headers
pub(crate) format: TraceIdFormat,
}
#[derive(Clone, Default, Debug, Deserialize, JsonSchema)]
#[serde(deny_unknown_fields, rename_all = "lowercase")]
pub(crate) enum TraceIdFormat {
/// Format the Trace ID as a hexadecimal number
///
/// (e.g. Trace ID 16 -> 00000000000000000000000000000010)
#[default]
Hexadecimal,
/// Format the Trace ID as a decimal number
///
/// (e.g. Trace ID 16 -> 16)
Decimal,
}
/// Configure propagation of traces. In general you won't have to do this as these are automatically configured
/// along with any exporter you configure.
#[derive(Clone, Default, Debug, Deserialize, JsonSchema)]
#[serde(deny_unknown_fields, default)]
pub(crate) struct Propagation {
/// Select a custom request header to set your own trace_id (header value must be convertible from hexadecimal to set a correct trace_id)
pub(crate) request: RequestPropagation,
/// Propagate baggage https://www.w3.org/TR/baggage/
pub(crate) baggage: bool,
/// Propagate trace context https://www.w3.org/TR/trace-context/
pub(crate) trace_context: bool,
/// Propagate Jaeger
pub(crate) jaeger: bool,
/// Propagate Datadog
pub(crate) datadog: bool,
/// Propagate Zipkin
pub(crate) zipkin: bool,
/// Propagate AWS X-Ray
pub(crate) aws_xray: bool,
}
#[derive(Clone, Debug, Deserialize, JsonSchema, Default)]
#[serde(deny_unknown_fields)]
pub(crate) struct RequestPropagation {
/// Choose the header name to expose trace_id (default: apollo-trace-id)
#[schemars(with = "String")]
#[serde(deserialize_with = "deserialize_option_header_name")]
pub(crate) header_name: Option<HeaderName>,
}
#[derive(Debug, Clone, Deserialize, JsonSchema)]
#[serde(deny_unknown_fields, default)]
#[non_exhaustive]
pub(crate) struct TracingCommon {
/// The trace service name
pub(crate) service_name: Option<String>,
/// The trace service namespace
pub(crate) service_namespace: Option<String>,
/// The sampler, always_on, always_off or a decimal between 0.0 and 1.0
pub(crate) sampler: SamplerOption,
/// Whether to use parent based sampling
pub(crate) parent_based_sampler: bool,
/// The maximum events per span before discarding
pub(crate) max_events_per_span: u32,
/// The maximum attributes per span before discarding
pub(crate) max_attributes_per_span: u32,
/// The maximum links per span before discarding
pub(crate) max_links_per_span: u32,
/// The maximum attributes per event before discarding
pub(crate) max_attributes_per_event: u32,
/// The maximum attributes per link before discarding
pub(crate) max_attributes_per_link: u32,
/// The Open Telemetry resource
pub(crate) resource: BTreeMap<String, AttributeValue>,
}
impl ConfigResource for TracingCommon {
fn service_name(&self) -> &Option<String> {
&self.service_name
}
fn service_namespace(&self) -> &Option<String> {
&self.service_namespace
}
fn resource(&self) -> &BTreeMap<String, AttributeValue> {
&self.resource
}
}
impl ConfigResource for MetricsCommon {
fn service_name(&self) -> &Option<String> {
&self.service_name
}
fn service_namespace(&self) -> &Option<String> {
&self.service_namespace
}
fn resource(&self) -> &BTreeMap<String, AttributeValue> {
&self.resource
}
}
fn default_parent_based_sampler() -> bool {
true
}
fn default_sampler() -> SamplerOption {
SamplerOption::Always(Sampler::AlwaysOn)
}
impl Default for TracingCommon {
fn default() -> Self {
Self {
service_name: Default::default(),
service_namespace: Default::default(),
sampler: default_sampler(),
parent_based_sampler: default_parent_based_sampler(),
max_events_per_span: default_max_events_per_span(),
max_attributes_per_span: default_max_attributes_per_span(),
max_links_per_span: default_max_links_per_span(),
max_attributes_per_event: default_max_attributes_per_event(),
max_attributes_per_link: default_max_attributes_per_link(),
resource: Default::default(),
}
}
}
fn default_max_events_per_span() -> u32 {
SpanLimits::default().max_events_per_span
}
fn default_max_attributes_per_span() -> u32 {
SpanLimits::default().max_attributes_per_span
}
fn default_max_links_per_span() -> u32 {
SpanLimits::default().max_links_per_span
}
fn default_max_attributes_per_event() -> u32 {
SpanLimits::default().max_attributes_per_event
}
fn default_max_attributes_per_link() -> u32 {
SpanLimits::default().max_attributes_per_link
}
#[derive(Debug, Clone, Deserialize, Serialize, JsonSchema, PartialEq)]
#[serde(untagged, deny_unknown_fields)]
pub(crate) enum AttributeValue {
/// bool values
Bool(bool),
/// i64 values
I64(i64),
/// f64 values
F64(f64),
/// String values
String(String),
/// Array of homogeneous values
Array(AttributeArray),
}
impl From<&'static str> for AttributeValue {
fn from(value: &'static str) -> Self {
AttributeValue::String(value.to_string())
}
}
impl From<i64> for AttributeValue {
fn from(value: i64) -> Self {
AttributeValue::I64(value)
}
}
impl std::fmt::Display for AttributeValue {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
match self {
AttributeValue::Bool(val) => write!(f, "{val}"),
AttributeValue::I64(val) => write!(f, "{val}"),
AttributeValue::F64(val) => write!(f, "{val}"),
AttributeValue::String(val) => write!(f, "{val}"),
AttributeValue::Array(val) => write!(f, "{val}"),
}
}
}
impl TryFrom<serde_json::Value> for AttributeValue {
type Error = ();
fn try_from(value: serde_json::Value) -> Result<Self, Self::Error> {
match value {
serde_json::Value::Null => Err(()),
serde_json::Value::Bool(v) => Ok(AttributeValue::Bool(v)),
serde_json::Value::Number(v) if v.is_i64() => {
Ok(AttributeValue::I64(v.as_i64().expect("i64 checked")))
}
serde_json::Value::Number(v) if v.is_f64() => {
Ok(AttributeValue::F64(v.as_f64().expect("f64 checked")))
}
serde_json::Value::String(v) => Ok(AttributeValue::String(v)),
serde_json::Value::Array(v) => {
if v.iter().all(|v| v.is_boolean()) {
Ok(AttributeValue::Array(AttributeArray::Bool(
v.iter()
.map(|v| v.as_bool().expect("all bools checked"))
.collect(),
)))
} else if v.iter().all(|v| v.is_f64()) {
Ok(AttributeValue::Array(AttributeArray::F64(
v.iter()
.map(|v| v.as_f64().expect("all f64 checked"))
.collect(),
)))
} else if v.iter().all(|v| v.is_i64()) {
Ok(AttributeValue::Array(AttributeArray::I64(
v.iter()
.map(|v| v.as_i64().expect("all i64 checked"))
.collect(),
)))
} else if v.iter().all(|v| v.is_string()) {
Ok(AttributeValue::Array(AttributeArray::String(
v.iter()
.map(|v| v.as_str().expect("all strings checked").to_string())
.collect(),
)))
} else {
Err(())
}
}
serde_json::Value::Object(_v) => Err(()),
_ => Err(()),
}
}
}
impl From<AttributeValue> for opentelemetry::Value {
fn from(value: AttributeValue) -> Self {
match value {
AttributeValue::Bool(v) => Value::Bool(v),
AttributeValue::I64(v) => Value::I64(v),
AttributeValue::F64(v) => Value::F64(v),
AttributeValue::String(v) => Value::String(v.into()),
AttributeValue::Array(v) => Value::Array(v.into()),
}
}
}
#[derive(Debug, Clone, Deserialize, Serialize, JsonSchema, PartialEq)]
#[serde(untagged, deny_unknown_fields)]
pub(crate) enum AttributeArray {
/// Array of bools
Bool(Vec<bool>),
/// Array of integers
I64(Vec<i64>),
/// Array of floats
F64(Vec<f64>),
/// Array of strings
String(Vec<String>),
}
impl std::fmt::Display for AttributeArray {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
match self {
AttributeArray::Bool(val) => write!(f, "{val:?}"),
AttributeArray::I64(val) => write!(f, "{val:?}"),
AttributeArray::F64(val) => write!(f, "{val:?}"),
AttributeArray::String(val) => write!(f, "{val:?}"),
}
}
}
impl From<AttributeArray> for opentelemetry::Array {
fn from(array: AttributeArray) -> Self {
match array {
AttributeArray::Bool(v) => Array::Bool(v),
AttributeArray::I64(v) => Array::I64(v),
AttributeArray::F64(v) => Array::F64(v),
AttributeArray::String(v) => Array::String(v.into_iter().map(|v| v.into()).collect()),
}
}
}
impl From<opentelemetry::Array> for AttributeArray {
fn from(array: opentelemetry::Array) -> Self {
match array {
opentelemetry::Array::Bool(v) => AttributeArray::Bool(v),
opentelemetry::Array::I64(v) => AttributeArray::I64(v),
opentelemetry::Array::F64(v) => AttributeArray::F64(v),
opentelemetry::Array::String(v) => {
AttributeArray::String(v.into_iter().map(|v| v.into()).collect())
}
}
}
}
#[derive(Clone, Debug, Deserialize, JsonSchema)]
#[serde(deny_unknown_fields, untagged)]
pub(crate) enum SamplerOption {
/// Sample a given fraction. Fractions >= 1 will always sample.
TraceIdRatioBased(f64),
Always(Sampler),
}
#[derive(Clone, Debug, Deserialize, JsonSchema)]
#[serde(deny_unknown_fields, rename_all = "snake_case")]
pub(crate) enum Sampler {
/// Always sample
AlwaysOn,
/// Never sample
AlwaysOff,
}
impl From<Sampler> for opentelemetry::sdk::trace::Sampler {
fn from(s: Sampler) -> Self {
match s {
Sampler::AlwaysOn => opentelemetry::sdk::trace::Sampler::AlwaysOn,
Sampler::AlwaysOff => opentelemetry::sdk::trace::Sampler::AlwaysOff,
}
}
}
impl From<SamplerOption> for opentelemetry::sdk::trace::Sampler {
fn from(s: SamplerOption) -> Self {
match s {
SamplerOption::Always(s) => s.into(),
SamplerOption::TraceIdRatioBased(ratio) => {
opentelemetry::sdk::trace::Sampler::TraceIdRatioBased(ratio)
}
}
}
}
impl From<&TracingCommon> for opentelemetry::sdk::trace::Config {
fn from(config: &TracingCommon) -> Self {
let mut common = opentelemetry::sdk::trace::config();
let mut sampler: opentelemetry::sdk::trace::Sampler = config.sampler.clone().into();
if config.parent_based_sampler {
sampler = parent_based(sampler);
}
common = common.with_sampler(sampler);
common = common.with_max_events_per_span(config.max_events_per_span);
common = common.with_max_attributes_per_span(config.max_attributes_per_span);
common = common.with_max_links_per_span(config.max_links_per_span);
common = common.with_max_attributes_per_event(config.max_attributes_per_event);
common = common.with_max_attributes_per_link(config.max_attributes_per_link);
// Take the default first, then config, then env resources, then env variable. Last entry wins
common = common.with_resource(config.to_resource());
common
}
}
fn parent_based(sampler: opentelemetry::sdk::trace::Sampler) -> opentelemetry::sdk::trace::Sampler {
opentelemetry::sdk::trace::Sampler::ParentBased(Box::new(sampler))
}
impl Conf {
pub(crate) fn calculate_field_level_instrumentation_ratio(&self) -> Result<f64, Error> {
Ok(
match (
&self.exporters.tracing.common.sampler,
&self.apollo.field_level_instrumentation_sampler,
) {
// Error conditions
(
SamplerOption::TraceIdRatioBased(global_ratio),
SamplerOption::TraceIdRatioBased(field_ratio),
) if field_ratio > global_ratio => {
Err(Error::InvalidFieldLevelInstrumentationSampler)?
}
(
SamplerOption::Always(Sampler::AlwaysOff),
SamplerOption::Always(Sampler::AlwaysOn),
) => Err(Error::InvalidFieldLevelInstrumentationSampler)?,
(
SamplerOption::Always(Sampler::AlwaysOff),
SamplerOption::TraceIdRatioBased(ratio),
) if *ratio != 0.0 => Err(Error::InvalidFieldLevelInstrumentationSampler)?,
(
SamplerOption::TraceIdRatioBased(ratio),
SamplerOption::Always(Sampler::AlwaysOn),
) if *ratio != 1.0 => Err(Error::InvalidFieldLevelInstrumentationSampler)?,
// Happy paths
(_, SamplerOption::TraceIdRatioBased(ratio)) if *ratio == 0.0 => 0.0,
(SamplerOption::TraceIdRatioBased(ratio), _) if *ratio == 0.0 => 0.0,
(_, SamplerOption::Always(Sampler::AlwaysOn)) => 1.0,
// the `field_ratio` should be a ratio of the entire set of requests. But FTV1 would only be reported
// if a trace was generated with the Apollo exporter, which has its own sampling `global_ratio`.
// in telemetry::request_ftv1, we activate FTV1 if the current trace is sampled and depending on
// the ratio returned by this function.
// This means that:
// - field_ratio cannot be larger than global_ratio (see above, we return an error in that case)
// - we have to divide field_ratio by global_ratio
// Example: we want to measure FTV1 on 30% of total requests, but we the Apollo tracer samples at 50%.
// If we measure FTV1 on 60% (0.3 / 0.5) of these sampled requests, that amounts to 30% of the total traffic
(
SamplerOption::TraceIdRatioBased(global_ratio),
SamplerOption::TraceIdRatioBased(field_ratio),
) => field_ratio / global_ratio,
(
SamplerOption::Always(Sampler::AlwaysOn),
SamplerOption::TraceIdRatioBased(field_ratio),
) => *field_ratio,
(_, _) => 0.0,
},
)
}
}
#[cfg(test)]
mod tests {
use serde_json::json;
use super::*;
#[test]
fn test_attribute_value_from_json() {
assert_eq!(
AttributeValue::try_from(json!("foo")),
Ok(AttributeValue::String("foo".to_string()))
);
assert_eq!(
AttributeValue::try_from(json!(1)),
Ok(AttributeValue::I64(1))
);
assert_eq!(
AttributeValue::try_from(json!(1.1)),
Ok(AttributeValue::F64(1.1))
);
assert_eq!(
AttributeValue::try_from(json!(true)),
Ok(AttributeValue::Bool(true))
);
assert_eq!(
AttributeValue::try_from(json!(["foo", "bar"])),
Ok(AttributeValue::Array(AttributeArray::String(vec![
"foo".to_string(),
"bar".to_string()
])))
);
assert_eq!(
AttributeValue::try_from(json!([1, 2])),
Ok(AttributeValue::Array(AttributeArray::I64(vec![1, 2])))
);
assert_eq!(
AttributeValue::try_from(json!([1.1, 1.5])),
Ok(AttributeValue::Array(AttributeArray::F64(vec![1.1, 1.5])))
);
assert_eq!(
AttributeValue::try_from(json!([true, false])),
Ok(AttributeValue::Array(AttributeArray::Bool(vec![
true, false
])))
);
// Mixed array conversions
AttributeValue::try_from(json!(["foo", true])).expect_err("mixed conversion must fail");
AttributeValue::try_from(json!([1, true])).expect_err("mixed conversion must fail");
AttributeValue::try_from(json!([1.1, true])).expect_err("mixed conversion must fail");
AttributeValue::try_from(json!([true, "bar"])).expect_err("mixed conversion must fail");
}
}