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build: move e2e dependencies into e2e/go.mod

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Several packages are only used while running the e2e suite. These
packages are less important to update, as the they can not influence the
final executable that is part of the Ceph-CSI container-image.

By moving these dependencies out of the main Ceph-CSI go.mod, it is
easier to identify if a reported CVE affects Ceph-CSI, or only the
testing (like most of the Kubernetes CVEs).

Signed-off-by: Niels de Vos <ndevos@ibm.com>
This commit is contained in:
Niels de Vos
2025-03-04 08:57:28 +01:00
committed by mergify[bot]
parent 15da101b1b
commit bec6090996
8047 changed files with 1407827 additions and 3453 deletions
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# Trace API
[![PkgGoDev](https://pkg.go.dev/badge/go.opentelemetry.io/otel/trace)](https://pkg.go.dev/go.opentelemetry.io/otel/trace)

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// Copyright The OpenTelemetry Authors
// SPDX-License-Identifier: Apache-2.0
package trace // import "go.opentelemetry.io/otel/trace"
import (
"time"
"go.opentelemetry.io/otel/attribute"
)
// TracerConfig is a group of options for a Tracer.
type TracerConfig struct {
instrumentationVersion string
// Schema URL of the telemetry emitted by the Tracer.
schemaURL string
attrs attribute.Set
}
// InstrumentationVersion returns the version of the library providing instrumentation.
func (t *TracerConfig) InstrumentationVersion() string {
return t.instrumentationVersion
}
// InstrumentationAttributes returns the attributes associated with the library
// providing instrumentation.
func (t *TracerConfig) InstrumentationAttributes() attribute.Set {
return t.attrs
}
// SchemaURL returns the Schema URL of the telemetry emitted by the Tracer.
func (t *TracerConfig) SchemaURL() string {
return t.schemaURL
}
// NewTracerConfig applies all the options to a returned TracerConfig.
func NewTracerConfig(options ...TracerOption) TracerConfig {
var config TracerConfig
for _, option := range options {
config = option.apply(config)
}
return config
}
// TracerOption applies an option to a TracerConfig.
type TracerOption interface {
apply(TracerConfig) TracerConfig
}
type tracerOptionFunc func(TracerConfig) TracerConfig
func (fn tracerOptionFunc) apply(cfg TracerConfig) TracerConfig {
return fn(cfg)
}
// SpanConfig is a group of options for a Span.
type SpanConfig struct {
attributes []attribute.KeyValue
timestamp time.Time
links []Link
newRoot bool
spanKind SpanKind
stackTrace bool
}
// Attributes describe the associated qualities of a Span.
func (cfg *SpanConfig) Attributes() []attribute.KeyValue {
return cfg.attributes
}
// Timestamp is a time in a Span life-cycle.
func (cfg *SpanConfig) Timestamp() time.Time {
return cfg.timestamp
}
// StackTrace checks whether stack trace capturing is enabled.
func (cfg *SpanConfig) StackTrace() bool {
return cfg.stackTrace
}
// Links are the associations a Span has with other Spans.
func (cfg *SpanConfig) Links() []Link {
return cfg.links
}
// NewRoot identifies a Span as the root Span for a new trace. This is
// commonly used when an existing trace crosses trust boundaries and the
// remote parent span context should be ignored for security.
func (cfg *SpanConfig) NewRoot() bool {
return cfg.newRoot
}
// SpanKind is the role a Span has in a trace.
func (cfg *SpanConfig) SpanKind() SpanKind {
return cfg.spanKind
}
// NewSpanStartConfig applies all the options to a returned SpanConfig.
// No validation is performed on the returned SpanConfig (e.g. no uniqueness
// checking or bounding of data), it is left to the SDK to perform this
// action.
func NewSpanStartConfig(options ...SpanStartOption) SpanConfig {
var c SpanConfig
for _, option := range options {
c = option.applySpanStart(c)
}
return c
}
// NewSpanEndConfig applies all the options to a returned SpanConfig.
// No validation is performed on the returned SpanConfig (e.g. no uniqueness
// checking or bounding of data), it is left to the SDK to perform this
// action.
func NewSpanEndConfig(options ...SpanEndOption) SpanConfig {
var c SpanConfig
for _, option := range options {
c = option.applySpanEnd(c)
}
return c
}
// SpanStartOption applies an option to a SpanConfig. These options are applicable
// only when the span is created.
type SpanStartOption interface {
applySpanStart(SpanConfig) SpanConfig
}
type spanOptionFunc func(SpanConfig) SpanConfig
func (fn spanOptionFunc) applySpanStart(cfg SpanConfig) SpanConfig {
return fn(cfg)
}
// SpanEndOption applies an option to a SpanConfig. These options are
// applicable only when the span is ended.
type SpanEndOption interface {
applySpanEnd(SpanConfig) SpanConfig
}
// EventConfig is a group of options for an Event.
type EventConfig struct {
attributes []attribute.KeyValue
timestamp time.Time
stackTrace bool
}
// Attributes describe the associated qualities of an Event.
func (cfg *EventConfig) Attributes() []attribute.KeyValue {
return cfg.attributes
}
// Timestamp is a time in an Event life-cycle.
func (cfg *EventConfig) Timestamp() time.Time {
return cfg.timestamp
}
// StackTrace checks whether stack trace capturing is enabled.
func (cfg *EventConfig) StackTrace() bool {
return cfg.stackTrace
}
// NewEventConfig applies all the EventOptions to a returned EventConfig. If no
// timestamp option is passed, the returned EventConfig will have a Timestamp
// set to the call time, otherwise no validation is performed on the returned
// EventConfig.
func NewEventConfig(options ...EventOption) EventConfig {
var c EventConfig
for _, option := range options {
c = option.applyEvent(c)
}
if c.timestamp.IsZero() {
c.timestamp = time.Now()
}
return c
}
// EventOption applies span event options to an EventConfig.
type EventOption interface {
applyEvent(EventConfig) EventConfig
}
// SpanOption are options that can be used at both the beginning and end of a span.
type SpanOption interface {
SpanStartOption
SpanEndOption
}
// SpanStartEventOption are options that can be used at the start of a span, or with an event.
type SpanStartEventOption interface {
SpanStartOption
EventOption
}
// SpanEndEventOption are options that can be used at the end of a span, or with an event.
type SpanEndEventOption interface {
SpanEndOption
EventOption
}
type attributeOption []attribute.KeyValue
func (o attributeOption) applySpan(c SpanConfig) SpanConfig {
c.attributes = append(c.attributes, []attribute.KeyValue(o)...)
return c
}
func (o attributeOption) applySpanStart(c SpanConfig) SpanConfig { return o.applySpan(c) }
func (o attributeOption) applyEvent(c EventConfig) EventConfig {
c.attributes = append(c.attributes, []attribute.KeyValue(o)...)
return c
}
var _ SpanStartEventOption = attributeOption{}
// WithAttributes adds the attributes related to a span life-cycle event.
// These attributes are used to describe the work a Span represents when this
// option is provided to a Span's start event. Otherwise, these
// attributes provide additional information about the event being recorded
// (e.g. error, state change, processing progress, system event).
//
// If multiple of these options are passed the attributes of each successive
// option will extend the attributes instead of overwriting. There is no
// guarantee of uniqueness in the resulting attributes.
func WithAttributes(attributes ...attribute.KeyValue) SpanStartEventOption {
return attributeOption(attributes)
}
// SpanEventOption are options that can be used with an event or a span.
type SpanEventOption interface {
SpanOption
EventOption
}
type timestampOption time.Time
func (o timestampOption) applySpan(c SpanConfig) SpanConfig {
c.timestamp = time.Time(o)
return c
}
func (o timestampOption) applySpanStart(c SpanConfig) SpanConfig { return o.applySpan(c) }
func (o timestampOption) applySpanEnd(c SpanConfig) SpanConfig { return o.applySpan(c) }
func (o timestampOption) applyEvent(c EventConfig) EventConfig {
c.timestamp = time.Time(o)
return c
}
var _ SpanEventOption = timestampOption{}
// WithTimestamp sets the time of a Span or Event life-cycle moment (e.g.
// started, stopped, errored).
func WithTimestamp(t time.Time) SpanEventOption {
return timestampOption(t)
}
type stackTraceOption bool
func (o stackTraceOption) applyEvent(c EventConfig) EventConfig {
c.stackTrace = bool(o)
return c
}
func (o stackTraceOption) applySpan(c SpanConfig) SpanConfig {
c.stackTrace = bool(o)
return c
}
func (o stackTraceOption) applySpanEnd(c SpanConfig) SpanConfig { return o.applySpan(c) }
// WithStackTrace sets the flag to capture the error with stack trace (e.g. true, false).
func WithStackTrace(b bool) SpanEndEventOption {
return stackTraceOption(b)
}
// WithLinks adds links to a Span. The links are added to the existing Span
// links, i.e. this does not overwrite. Links with invalid span context are ignored.
func WithLinks(links ...Link) SpanStartOption {
return spanOptionFunc(func(cfg SpanConfig) SpanConfig {
cfg.links = append(cfg.links, links...)
return cfg
})
}
// WithNewRoot specifies that the Span should be treated as a root Span. Any
// existing parent span context will be ignored when defining the Span's trace
// identifiers.
func WithNewRoot() SpanStartOption {
return spanOptionFunc(func(cfg SpanConfig) SpanConfig {
cfg.newRoot = true
return cfg
})
}
// WithSpanKind sets the SpanKind of a Span.
func WithSpanKind(kind SpanKind) SpanStartOption {
return spanOptionFunc(func(cfg SpanConfig) SpanConfig {
cfg.spanKind = kind
return cfg
})
}
// WithInstrumentationVersion sets the instrumentation version.
func WithInstrumentationVersion(version string) TracerOption {
return tracerOptionFunc(func(cfg TracerConfig) TracerConfig {
cfg.instrumentationVersion = version
return cfg
})
}
// WithInstrumentationAttributes sets the instrumentation attributes.
//
// The passed attributes will be de-duplicated.
func WithInstrumentationAttributes(attr ...attribute.KeyValue) TracerOption {
return tracerOptionFunc(func(config TracerConfig) TracerConfig {
config.attrs = attribute.NewSet(attr...)
return config
})
}
// WithSchemaURL sets the schema URL for the Tracer.
func WithSchemaURL(schemaURL string) TracerOption {
return tracerOptionFunc(func(cfg TracerConfig) TracerConfig {
cfg.schemaURL = schemaURL
return cfg
})
}

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// Copyright The OpenTelemetry Authors
// SPDX-License-Identifier: Apache-2.0
package trace // import "go.opentelemetry.io/otel/trace"
import "context"
type traceContextKeyType int
const currentSpanKey traceContextKeyType = iota
// ContextWithSpan returns a copy of parent with span set as the current Span.
func ContextWithSpan(parent context.Context, span Span) context.Context {
return context.WithValue(parent, currentSpanKey, span)
}
// ContextWithSpanContext returns a copy of parent with sc as the current
// Span. The Span implementation that wraps sc is non-recording and performs
// no operations other than to return sc as the SpanContext from the
// SpanContext method.
func ContextWithSpanContext(parent context.Context, sc SpanContext) context.Context {
return ContextWithSpan(parent, nonRecordingSpan{sc: sc})
}
// ContextWithRemoteSpanContext returns a copy of parent with rsc set explicitly
// as a remote SpanContext and as the current Span. The Span implementation
// that wraps rsc is non-recording and performs no operations other than to
// return rsc as the SpanContext from the SpanContext method.
func ContextWithRemoteSpanContext(parent context.Context, rsc SpanContext) context.Context {
return ContextWithSpanContext(parent, rsc.WithRemote(true))
}
// SpanFromContext returns the current Span from ctx.
//
// If no Span is currently set in ctx an implementation of a Span that
// performs no operations is returned.
func SpanFromContext(ctx context.Context) Span {
if ctx == nil {
return noopSpanInstance
}
if span, ok := ctx.Value(currentSpanKey).(Span); ok {
return span
}
return noopSpanInstance
}
// SpanContextFromContext returns the current Span's SpanContext.
func SpanContextFromContext(ctx context.Context) SpanContext {
return SpanFromContext(ctx).SpanContext()
}

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// Copyright The OpenTelemetry Authors
// SPDX-License-Identifier: Apache-2.0
/*
Package trace provides an implementation of the tracing part of the
OpenTelemetry API.
To participate in distributed traces a Span needs to be created for the
operation being performed as part of a traced workflow. In its simplest form:
var tracer trace.Tracer
func init() {
tracer = otel.Tracer("instrumentation/package/name")
}
func operation(ctx context.Context) {
var span trace.Span
ctx, span = tracer.Start(ctx, "operation")
defer span.End()
// ...
}
A Tracer is unique to the instrumentation and is used to create Spans.
Instrumentation should be designed to accept a TracerProvider from which it
can create its own unique Tracer. Alternatively, the registered global
TracerProvider from the go.opentelemetry.io/otel package can be used as
a default.
const (
name = "instrumentation/package/name"
version = "0.1.0"
)
type Instrumentation struct {
tracer trace.Tracer
}
func NewInstrumentation(tp trace.TracerProvider) *Instrumentation {
if tp == nil {
tp = otel.TracerProvider()
}
return &Instrumentation{
tracer: tp.Tracer(name, trace.WithInstrumentationVersion(version)),
}
}
func operation(ctx context.Context, inst *Instrumentation) {
var span trace.Span
ctx, span = inst.tracer.Start(ctx, "operation")
defer span.End()
// ...
}
# API Implementations
This package does not conform to the standard Go versioning policy; all of its
interfaces may have methods added to them without a package major version bump.
This non-standard API evolution could surprise an uninformed implementation
author. They could unknowingly build their implementation in a way that would
result in a runtime panic for their users that update to the new API.
The API is designed to help inform an instrumentation author about this
non-standard API evolution. It requires them to choose a default behavior for
unimplemented interface methods. There are three behavior choices they can
make:
- Compilation failure
- Panic
- Default to another implementation
All interfaces in this API embed a corresponding interface from
[go.opentelemetry.io/otel/trace/embedded]. If an author wants the default
behavior of their implementations to be a compilation failure, signaling to
their users they need to update to the latest version of that implementation,
they need to embed the corresponding interface from
[go.opentelemetry.io/otel/trace/embedded] in their implementation. For
example,
import "go.opentelemetry.io/otel/trace/embedded"
type TracerProvider struct {
embedded.TracerProvider
// ...
}
If an author wants the default behavior of their implementations to panic, they
can embed the API interface directly.
import "go.opentelemetry.io/otel/trace"
type TracerProvider struct {
trace.TracerProvider
// ...
}
This option is not recommended. It will lead to publishing packages that
contain runtime panics when users update to newer versions of
[go.opentelemetry.io/otel/trace], which may be done with a transitive
dependency.
Finally, an author can embed another implementation in theirs. The embedded
implementation will be used for methods not defined by the author. For example,
an author who wants to default to silently dropping the call can use
[go.opentelemetry.io/otel/trace/noop]:
import "go.opentelemetry.io/otel/trace/noop"
type TracerProvider struct {
noop.TracerProvider
// ...
}
It is strongly recommended that authors only embed
[go.opentelemetry.io/otel/trace/noop] if they choose this default behavior.
That implementation is the only one OpenTelemetry authors can guarantee will
fully implement all the API interfaces when a user updates their API.
*/
package trace // import "go.opentelemetry.io/otel/trace"

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# Trace Embedded
[![PkgGoDev](https://pkg.go.dev/badge/go.opentelemetry.io/otel/trace/embedded)](https://pkg.go.dev/go.opentelemetry.io/otel/trace/embedded)

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// Copyright The OpenTelemetry Authors
// SPDX-License-Identifier: Apache-2.0
// Package embedded provides interfaces embedded within the [OpenTelemetry
// trace API].
//
// Implementers of the [OpenTelemetry trace API] can embed the relevant type
// from this package into their implementation directly. Doing so will result
// in a compilation error for users when the [OpenTelemetry trace API] is
// extended (which is something that can happen without a major version bump of
// the API package).
//
// [OpenTelemetry trace API]: https://pkg.go.dev/go.opentelemetry.io/otel/trace
package embedded // import "go.opentelemetry.io/otel/trace/embedded"
// TracerProvider is embedded in
// [go.opentelemetry.io/otel/trace.TracerProvider].
//
// Embed this interface in your implementation of the
// [go.opentelemetry.io/otel/trace.TracerProvider] if you want users to
// experience a compilation error, signaling they need to update to your latest
// implementation, when the [go.opentelemetry.io/otel/trace.TracerProvider]
// interface is extended (which is something that can happen without a major
// version bump of the API package).
type TracerProvider interface{ tracerProvider() }
// Tracer is embedded in [go.opentelemetry.io/otel/trace.Tracer].
//
// Embed this interface in your implementation of the
// [go.opentelemetry.io/otel/trace.Tracer] if you want users to experience a
// compilation error, signaling they need to update to your latest
// implementation, when the [go.opentelemetry.io/otel/trace.Tracer] interface
// is extended (which is something that can happen without a major version bump
// of the API package).
type Tracer interface{ tracer() }
// Span is embedded in [go.opentelemetry.io/otel/trace.Span].
//
// Embed this interface in your implementation of the
// [go.opentelemetry.io/otel/trace.Span] if you want users to experience a
// compilation error, signaling they need to update to your latest
// implementation, when the [go.opentelemetry.io/otel/trace.Span] interface is
// extended (which is something that can happen without a major version bump of
// the API package).
type Span interface{ span() }

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// Copyright The OpenTelemetry Authors
// SPDX-License-Identifier: Apache-2.0
package trace // import "go.opentelemetry.io/otel/trace"
// nonRecordingSpan is a minimal implementation of a Span that wraps a
// SpanContext. It performs no operations other than to return the wrapped
// SpanContext.
type nonRecordingSpan struct {
noopSpan
sc SpanContext
}
// SpanContext returns the wrapped SpanContext.
func (s nonRecordingSpan) SpanContext() SpanContext { return s.sc }

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// Copyright The OpenTelemetry Authors
// SPDX-License-Identifier: Apache-2.0
package trace // import "go.opentelemetry.io/otel/trace"
import (
"context"
"go.opentelemetry.io/otel/attribute"
"go.opentelemetry.io/otel/codes"
"go.opentelemetry.io/otel/trace/embedded"
)
// NewNoopTracerProvider returns an implementation of TracerProvider that
// performs no operations. The Tracer and Spans created from the returned
// TracerProvider also perform no operations.
//
// Deprecated: Use [go.opentelemetry.io/otel/trace/noop.NewTracerProvider]
// instead.
func NewNoopTracerProvider() TracerProvider {
return noopTracerProvider{}
}
type noopTracerProvider struct{ embedded.TracerProvider }
var _ TracerProvider = noopTracerProvider{}
// Tracer returns noop implementation of Tracer.
func (p noopTracerProvider) Tracer(string, ...TracerOption) Tracer {
return noopTracer{}
}
// noopTracer is an implementation of Tracer that performs no operations.
type noopTracer struct{ embedded.Tracer }
var _ Tracer = noopTracer{}
// Start carries forward a non-recording Span, if one is present in the context, otherwise it
// creates a no-op Span.
func (t noopTracer) Start(ctx context.Context, name string, _ ...SpanStartOption) (context.Context, Span) {
span := SpanFromContext(ctx)
if _, ok := span.(nonRecordingSpan); !ok {
// span is likely already a noopSpan, but let's be sure
span = noopSpanInstance
}
return ContextWithSpan(ctx, span), span
}
// noopSpan is an implementation of Span that performs no operations.
type noopSpan struct{ embedded.Span }
var noopSpanInstance Span = noopSpan{}
// SpanContext returns an empty span context.
func (noopSpan) SpanContext() SpanContext { return SpanContext{} }
// IsRecording always returns false.
func (noopSpan) IsRecording() bool { return false }
// SetStatus does nothing.
func (noopSpan) SetStatus(codes.Code, string) {}
// SetError does nothing.
func (noopSpan) SetError(bool) {}
// SetAttributes does nothing.
func (noopSpan) SetAttributes(...attribute.KeyValue) {}
// End does nothing.
func (noopSpan) End(...SpanEndOption) {}
// RecordError does nothing.
func (noopSpan) RecordError(error, ...EventOption) {}
// AddEvent does nothing.
func (noopSpan) AddEvent(string, ...EventOption) {}
// AddLink does nothing.
func (noopSpan) AddLink(Link) {}
// SetName does nothing.
func (noopSpan) SetName(string) {}
// TracerProvider returns a no-op TracerProvider.
func (noopSpan) TracerProvider() TracerProvider { return noopTracerProvider{} }

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# Trace Noop
[![PkgGoDev](https://pkg.go.dev/badge/go.opentelemetry.io/otel/trace/noop)](https://pkg.go.dev/go.opentelemetry.io/otel/trace/noop)

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// Copyright The OpenTelemetry Authors
// SPDX-License-Identifier: Apache-2.0
// Package noop provides an implementation of the OpenTelemetry trace API that
// produces no telemetry and minimizes used computation resources.
//
// Using this package to implement the OpenTelemetry trace API will effectively
// disable OpenTelemetry.
//
// This implementation can be embedded in other implementations of the
// OpenTelemetry trace API. Doing so will mean the implementation defaults to
// no operation for methods it does not implement.
package noop // import "go.opentelemetry.io/otel/trace/noop"
import (
"context"
"go.opentelemetry.io/otel/attribute"
"go.opentelemetry.io/otel/codes"
"go.opentelemetry.io/otel/trace"
"go.opentelemetry.io/otel/trace/embedded"
)
var (
// Compile-time check this implements the OpenTelemetry API.
_ trace.TracerProvider = TracerProvider{}
_ trace.Tracer = Tracer{}
_ trace.Span = Span{}
)
// TracerProvider is an OpenTelemetry No-Op TracerProvider.
type TracerProvider struct{ embedded.TracerProvider }
// NewTracerProvider returns a TracerProvider that does not record any telemetry.
func NewTracerProvider() TracerProvider {
return TracerProvider{}
}
// Tracer returns an OpenTelemetry Tracer that does not record any telemetry.
func (TracerProvider) Tracer(string, ...trace.TracerOption) trace.Tracer {
return Tracer{}
}
// Tracer is an OpenTelemetry No-Op Tracer.
type Tracer struct{ embedded.Tracer }
// Start creates a span. The created span will be set in a child context of ctx
// and returned with the span.
//
// If ctx contains a span context, the returned span will also contain that
// span context. If the span context in ctx is for a non-recording span, that
// span instance will be returned directly.
func (t Tracer) Start(ctx context.Context, _ string, _ ...trace.SpanStartOption) (context.Context, trace.Span) {
span := trace.SpanFromContext(ctx)
// If the parent context contains a non-zero span context, that span
// context needs to be returned as a non-recording span
// (https://github.com/open-telemetry/opentelemetry-specification/blob/3a1dde966a4ce87cce5adf464359fe369741bbea/specification/trace/api.md#behavior-of-the-api-in-the-absence-of-an-installed-sdk).
var zeroSC trace.SpanContext
if sc := span.SpanContext(); !sc.Equal(zeroSC) {
if !span.IsRecording() {
// If the span is not recording return it directly.
return ctx, span
}
// Otherwise, return the span context needs in a non-recording span.
span = Span{sc: sc}
} else {
// No parent, return a No-Op span with an empty span context.
span = noopSpanInstance
}
return trace.ContextWithSpan(ctx, span), span
}
var noopSpanInstance trace.Span = Span{}
// Span is an OpenTelemetry No-Op Span.
type Span struct {
embedded.Span
sc trace.SpanContext
}
// SpanContext returns an empty span context.
func (s Span) SpanContext() trace.SpanContext { return s.sc }
// IsRecording always returns false.
func (Span) IsRecording() bool { return false }
// SetStatus does nothing.
func (Span) SetStatus(codes.Code, string) {}
// SetAttributes does nothing.
func (Span) SetAttributes(...attribute.KeyValue) {}
// End does nothing.
func (Span) End(...trace.SpanEndOption) {}
// RecordError does nothing.
func (Span) RecordError(error, ...trace.EventOption) {}
// AddEvent does nothing.
func (Span) AddEvent(string, ...trace.EventOption) {}
// AddLink does nothing.
func (Span) AddLink(trace.Link) {}
// SetName does nothing.
func (Span) SetName(string) {}
// TracerProvider returns a No-Op TracerProvider.
func (Span) TracerProvider() trace.TracerProvider { return TracerProvider{} }

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// Copyright The OpenTelemetry Authors
// SPDX-License-Identifier: Apache-2.0
package trace // import "go.opentelemetry.io/otel/trace"
import "go.opentelemetry.io/otel/trace/embedded"
// TracerProvider provides Tracers that are used by instrumentation code to
// trace computational workflows.
//
// A TracerProvider is the collection destination of all Spans from Tracers it
// provides, it represents a unique telemetry collection pipeline. How that
// pipeline is defined, meaning how those Spans are collected, processed, and
// where they are exported, depends on its implementation. Instrumentation
// authors do not need to define this implementation, rather just use the
// provided Tracers to instrument code.
//
// Commonly, instrumentation code will accept a TracerProvider implementation
// at runtime from its users or it can simply use the globally registered one
// (see https://pkg.go.dev/go.opentelemetry.io/otel#GetTracerProvider).
//
// Warning: Methods may be added to this interface in minor releases. See
// package documentation on API implementation for information on how to set
// default behavior for unimplemented methods.
type TracerProvider interface {
// Users of the interface can ignore this. This embedded type is only used
// by implementations of this interface. See the "API Implementations"
// section of the package documentation for more information.
embedded.TracerProvider
// Tracer returns a unique Tracer scoped to be used by instrumentation code
// to trace computational workflows. The scope and identity of that
// instrumentation code is uniquely defined by the name and options passed.
//
// The passed name needs to uniquely identify instrumentation code.
// Therefore, it is recommended that name is the Go package name of the
// library providing instrumentation (note: not the code being
// instrumented). Instrumentation libraries can have multiple versions,
// therefore, the WithInstrumentationVersion option should be used to
// distinguish these different codebases. Additionally, instrumentation
// libraries may sometimes use traces to communicate different domains of
// workflow data (i.e. using spans to communicate workflow events only). If
// this is the case, the WithScopeAttributes option should be used to
// uniquely identify Tracers that handle the different domains of workflow
// data.
//
// If the same name and options are passed multiple times, the same Tracer
// will be returned (it is up to the implementation if this will be the
// same underlying instance of that Tracer or not). It is not necessary to
// call this multiple times with the same name and options to get an
// up-to-date Tracer. All implementations will ensure any TracerProvider
// configuration changes are propagated to all provided Tracers.
//
// If name is empty, then an implementation defined default name will be
// used instead.
//
// This method is safe to call concurrently.
Tracer(name string, options ...TracerOption) Tracer
}

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// Copyright The OpenTelemetry Authors
// SPDX-License-Identifier: Apache-2.0
package trace // import "go.opentelemetry.io/otel/trace"
import (
"context"
"go.opentelemetry.io/otel/attribute"
"go.opentelemetry.io/otel/codes"
"go.opentelemetry.io/otel/trace/embedded"
)
// Span is the individual component of a trace. It represents a single named
// and timed operation of a workflow that is traced. A Tracer is used to
// create a Span and it is then up to the operation the Span represents to
// properly end the Span when the operation itself ends.
//
// Warning: Methods may be added to this interface in minor releases. See
// package documentation on API implementation for information on how to set
// default behavior for unimplemented methods.
type Span interface {
// Users of the interface can ignore this. This embedded type is only used
// by implementations of this interface. See the "API Implementations"
// section of the package documentation for more information.
embedded.Span
// End completes the Span. The Span is considered complete and ready to be
// delivered through the rest of the telemetry pipeline after this method
// is called. Therefore, updates to the Span are not allowed after this
// method has been called.
End(options ...SpanEndOption)
// AddEvent adds an event with the provided name and options.
AddEvent(name string, options ...EventOption)
// AddLink adds a link.
// Adding links at span creation using WithLinks is preferred to calling AddLink
// later, for contexts that are available during span creation, because head
// sampling decisions can only consider information present during span creation.
AddLink(link Link)
// IsRecording returns the recording state of the Span. It will return
// true if the Span is active and events can be recorded.
IsRecording() bool
// RecordError will record err as an exception span event for this span. An
// additional call to SetStatus is required if the Status of the Span should
// be set to Error, as this method does not change the Span status. If this
// span is not being recorded or err is nil then this method does nothing.
RecordError(err error, options ...EventOption)
// SpanContext returns the SpanContext of the Span. The returned SpanContext
// is usable even after the End method has been called for the Span.
SpanContext() SpanContext
// SetStatus sets the status of the Span in the form of a code and a
// description, provided the status hasn't already been set to a higher
// value before (OK > Error > Unset). The description is only included in a
// status when the code is for an error.
SetStatus(code codes.Code, description string)
// SetName sets the Span name.
SetName(name string)
// SetAttributes sets kv as attributes of the Span. If a key from kv
// already exists for an attribute of the Span it will be overwritten with
// the value contained in kv.
SetAttributes(kv ...attribute.KeyValue)
// TracerProvider returns a TracerProvider that can be used to generate
// additional Spans on the same telemetry pipeline as the current Span.
TracerProvider() TracerProvider
}
// Link is the relationship between two Spans. The relationship can be within
// the same Trace or across different Traces.
//
// For example, a Link is used in the following situations:
//
// 1. Batch Processing: A batch of operations may contain operations
// associated with one or more traces/spans. Since there can only be one
// parent SpanContext, a Link is used to keep reference to the
// SpanContext of all operations in the batch.
// 2. Public Endpoint: A SpanContext for an in incoming client request on a
// public endpoint should be considered untrusted. In such a case, a new
// trace with its own identity and sampling decision needs to be created,
// but this new trace needs to be related to the original trace in some
// form. A Link is used to keep reference to the original SpanContext and
// track the relationship.
type Link struct {
// SpanContext of the linked Span.
SpanContext SpanContext
// Attributes describe the aspects of the link.
Attributes []attribute.KeyValue
}
// LinkFromContext returns a link encapsulating the SpanContext in the provided
// ctx.
func LinkFromContext(ctx context.Context, attrs ...attribute.KeyValue) Link {
return Link{
SpanContext: SpanContextFromContext(ctx),
Attributes: attrs,
}
}
// SpanKind is the role a Span plays in a Trace.
type SpanKind int
// As a convenience, these match the proto definition, see
// https://github.com/open-telemetry/opentelemetry-proto/blob/30d237e1ff3ab7aa50e0922b5bebdd93505090af/opentelemetry/proto/trace/v1/trace.proto#L101-L129
//
// The unspecified value is not a valid `SpanKind`. Use `ValidateSpanKind()`
// to coerce a span kind to a valid value.
const (
// SpanKindUnspecified is an unspecified SpanKind and is not a valid
// SpanKind. SpanKindUnspecified should be replaced with SpanKindInternal
// if it is received.
SpanKindUnspecified SpanKind = 0
// SpanKindInternal is a SpanKind for a Span that represents an internal
// operation within an application.
SpanKindInternal SpanKind = 1
// SpanKindServer is a SpanKind for a Span that represents the operation
// of handling a request from a client.
SpanKindServer SpanKind = 2
// SpanKindClient is a SpanKind for a Span that represents the operation
// of client making a request to a server.
SpanKindClient SpanKind = 3
// SpanKindProducer is a SpanKind for a Span that represents the operation
// of a producer sending a message to a message broker. Unlike
// SpanKindClient and SpanKindServer, there is often no direct
// relationship between this kind of Span and a SpanKindConsumer kind. A
// SpanKindProducer Span will end once the message is accepted by the
// message broker which might not overlap with the processing of that
// message.
SpanKindProducer SpanKind = 4
// SpanKindConsumer is a SpanKind for a Span that represents the operation
// of a consumer receiving a message from a message broker. Like
// SpanKindProducer Spans, there is often no direct relationship between
// this Span and the Span that produced the message.
SpanKindConsumer SpanKind = 5
)
// ValidateSpanKind returns a valid span kind value. This will coerce
// invalid values into the default value, SpanKindInternal.
func ValidateSpanKind(spanKind SpanKind) SpanKind {
switch spanKind {
case SpanKindInternal,
SpanKindServer,
SpanKindClient,
SpanKindProducer,
SpanKindConsumer:
// valid
return spanKind
default:
return SpanKindInternal
}
}
// String returns the specified name of the SpanKind in lower-case.
func (sk SpanKind) String() string {
switch sk {
case SpanKindInternal:
return "internal"
case SpanKindServer:
return "server"
case SpanKindClient:
return "client"
case SpanKindProducer:
return "producer"
case SpanKindConsumer:
return "consumer"
default:
return "unspecified"
}
}

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// Copyright The OpenTelemetry Authors
// SPDX-License-Identifier: Apache-2.0
package trace // import "go.opentelemetry.io/otel/trace"
import (
"bytes"
"encoding/hex"
"encoding/json"
)
const (
// FlagsSampled is a bitmask with the sampled bit set. A SpanContext
// with the sampling bit set means the span is sampled.
FlagsSampled = TraceFlags(0x01)
errInvalidHexID errorConst = "trace-id and span-id can only contain [0-9a-f] characters, all lowercase"
errInvalidTraceIDLength errorConst = "hex encoded trace-id must have length equals to 32"
errNilTraceID errorConst = "trace-id can't be all zero"
errInvalidSpanIDLength errorConst = "hex encoded span-id must have length equals to 16"
errNilSpanID errorConst = "span-id can't be all zero"
)
type errorConst string
func (e errorConst) Error() string {
return string(e)
}
// TraceID is a unique identity of a trace.
// nolint:revive // revive complains about stutter of `trace.TraceID`.
type TraceID [16]byte
var (
nilTraceID TraceID
_ json.Marshaler = nilTraceID
)
// IsValid checks whether the trace TraceID is valid. A valid trace ID does
// not consist of zeros only.
func (t TraceID) IsValid() bool {
return !bytes.Equal(t[:], nilTraceID[:])
}
// MarshalJSON implements a custom marshal function to encode TraceID
// as a hex string.
func (t TraceID) MarshalJSON() ([]byte, error) {
return json.Marshal(t.String())
}
// String returns the hex string representation form of a TraceID.
func (t TraceID) String() string {
return hex.EncodeToString(t[:])
}
// SpanID is a unique identity of a span in a trace.
type SpanID [8]byte
var (
nilSpanID SpanID
_ json.Marshaler = nilSpanID
)
// IsValid checks whether the SpanID is valid. A valid SpanID does not consist
// of zeros only.
func (s SpanID) IsValid() bool {
return !bytes.Equal(s[:], nilSpanID[:])
}
// MarshalJSON implements a custom marshal function to encode SpanID
// as a hex string.
func (s SpanID) MarshalJSON() ([]byte, error) {
return json.Marshal(s.String())
}
// String returns the hex string representation form of a SpanID.
func (s SpanID) String() string {
return hex.EncodeToString(s[:])
}
// TraceIDFromHex returns a TraceID from a hex string if it is compliant with
// the W3C trace-context specification. See more at
// https://www.w3.org/TR/trace-context/#trace-id
// nolint:revive // revive complains about stutter of `trace.TraceIDFromHex`.
func TraceIDFromHex(h string) (TraceID, error) {
t := TraceID{}
if len(h) != 32 {
return t, errInvalidTraceIDLength
}
if err := decodeHex(h, t[:]); err != nil {
return t, err
}
if !t.IsValid() {
return t, errNilTraceID
}
return t, nil
}
// SpanIDFromHex returns a SpanID from a hex string if it is compliant
// with the w3c trace-context specification.
// See more at https://www.w3.org/TR/trace-context/#parent-id
func SpanIDFromHex(h string) (SpanID, error) {
s := SpanID{}
if len(h) != 16 {
return s, errInvalidSpanIDLength
}
if err := decodeHex(h, s[:]); err != nil {
return s, err
}
if !s.IsValid() {
return s, errNilSpanID
}
return s, nil
}
func decodeHex(h string, b []byte) error {
for _, r := range h {
switch {
case 'a' <= r && r <= 'f':
continue
case '0' <= r && r <= '9':
continue
default:
return errInvalidHexID
}
}
decoded, err := hex.DecodeString(h)
if err != nil {
return err
}
copy(b, decoded)
return nil
}
// TraceFlags contains flags that can be set on a SpanContext.
type TraceFlags byte //nolint:revive // revive complains about stutter of `trace.TraceFlags`.
// IsSampled returns if the sampling bit is set in the TraceFlags.
func (tf TraceFlags) IsSampled() bool {
return tf&FlagsSampled == FlagsSampled
}
// WithSampled sets the sampling bit in a new copy of the TraceFlags.
func (tf TraceFlags) WithSampled(sampled bool) TraceFlags { // nolint:revive // sampled is not a control flag.
if sampled {
return tf | FlagsSampled
}
return tf &^ FlagsSampled
}
// MarshalJSON implements a custom marshal function to encode TraceFlags
// as a hex string.
func (tf TraceFlags) MarshalJSON() ([]byte, error) {
return json.Marshal(tf.String())
}
// String returns the hex string representation form of TraceFlags.
func (tf TraceFlags) String() string {
return hex.EncodeToString([]byte{byte(tf)}[:])
}
// SpanContextConfig contains mutable fields usable for constructing
// an immutable SpanContext.
type SpanContextConfig struct {
TraceID TraceID
SpanID SpanID
TraceFlags TraceFlags
TraceState TraceState
Remote bool
}
// NewSpanContext constructs a SpanContext using values from the provided
// SpanContextConfig.
func NewSpanContext(config SpanContextConfig) SpanContext {
return SpanContext{
traceID: config.TraceID,
spanID: config.SpanID,
traceFlags: config.TraceFlags,
traceState: config.TraceState,
remote: config.Remote,
}
}
// SpanContext contains identifying trace information about a Span.
type SpanContext struct {
traceID TraceID
spanID SpanID
traceFlags TraceFlags
traceState TraceState
remote bool
}
var _ json.Marshaler = SpanContext{}
// IsValid returns if the SpanContext is valid. A valid span context has a
// valid TraceID and SpanID.
func (sc SpanContext) IsValid() bool {
return sc.HasTraceID() && sc.HasSpanID()
}
// IsRemote indicates whether the SpanContext represents a remotely-created Span.
func (sc SpanContext) IsRemote() bool {
return sc.remote
}
// WithRemote returns a copy of sc with the Remote property set to remote.
func (sc SpanContext) WithRemote(remote bool) SpanContext {
return SpanContext{
traceID: sc.traceID,
spanID: sc.spanID,
traceFlags: sc.traceFlags,
traceState: sc.traceState,
remote: remote,
}
}
// TraceID returns the TraceID from the SpanContext.
func (sc SpanContext) TraceID() TraceID {
return sc.traceID
}
// HasTraceID checks if the SpanContext has a valid TraceID.
func (sc SpanContext) HasTraceID() bool {
return sc.traceID.IsValid()
}
// WithTraceID returns a new SpanContext with the TraceID replaced.
func (sc SpanContext) WithTraceID(traceID TraceID) SpanContext {
return SpanContext{
traceID: traceID,
spanID: sc.spanID,
traceFlags: sc.traceFlags,
traceState: sc.traceState,
remote: sc.remote,
}
}
// SpanID returns the SpanID from the SpanContext.
func (sc SpanContext) SpanID() SpanID {
return sc.spanID
}
// HasSpanID checks if the SpanContext has a valid SpanID.
func (sc SpanContext) HasSpanID() bool {
return sc.spanID.IsValid()
}
// WithSpanID returns a new SpanContext with the SpanID replaced.
func (sc SpanContext) WithSpanID(spanID SpanID) SpanContext {
return SpanContext{
traceID: sc.traceID,
spanID: spanID,
traceFlags: sc.traceFlags,
traceState: sc.traceState,
remote: sc.remote,
}
}
// TraceFlags returns the flags from the SpanContext.
func (sc SpanContext) TraceFlags() TraceFlags {
return sc.traceFlags
}
// IsSampled returns if the sampling bit is set in the SpanContext's TraceFlags.
func (sc SpanContext) IsSampled() bool {
return sc.traceFlags.IsSampled()
}
// WithTraceFlags returns a new SpanContext with the TraceFlags replaced.
func (sc SpanContext) WithTraceFlags(flags TraceFlags) SpanContext {
return SpanContext{
traceID: sc.traceID,
spanID: sc.spanID,
traceFlags: flags,
traceState: sc.traceState,
remote: sc.remote,
}
}
// TraceState returns the TraceState from the SpanContext.
func (sc SpanContext) TraceState() TraceState {
return sc.traceState
}
// WithTraceState returns a new SpanContext with the TraceState replaced.
func (sc SpanContext) WithTraceState(state TraceState) SpanContext {
return SpanContext{
traceID: sc.traceID,
spanID: sc.spanID,
traceFlags: sc.traceFlags,
traceState: state,
remote: sc.remote,
}
}
// Equal is a predicate that determines whether two SpanContext values are equal.
func (sc SpanContext) Equal(other SpanContext) bool {
return sc.traceID == other.traceID &&
sc.spanID == other.spanID &&
sc.traceFlags == other.traceFlags &&
sc.traceState.String() == other.traceState.String() &&
sc.remote == other.remote
}
// MarshalJSON implements a custom marshal function to encode a SpanContext.
func (sc SpanContext) MarshalJSON() ([]byte, error) {
return json.Marshal(SpanContextConfig{
TraceID: sc.traceID,
SpanID: sc.spanID,
TraceFlags: sc.traceFlags,
TraceState: sc.traceState,
Remote: sc.remote,
})
}

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// Copyright The OpenTelemetry Authors
// SPDX-License-Identifier: Apache-2.0
package trace // import "go.opentelemetry.io/otel/trace"
import (
"context"
"go.opentelemetry.io/otel/trace/embedded"
)
// Tracer is the creator of Spans.
//
// Warning: Methods may be added to this interface in minor releases. See
// package documentation on API implementation for information on how to set
// default behavior for unimplemented methods.
type Tracer interface {
// Users of the interface can ignore this. This embedded type is only used
// by implementations of this interface. See the "API Implementations"
// section of the package documentation for more information.
embedded.Tracer
// Start creates a span and a context.Context containing the newly-created span.
//
// If the context.Context provided in `ctx` contains a Span then the newly-created
// Span will be a child of that span, otherwise it will be a root span. This behavior
// can be overridden by providing `WithNewRoot()` as a SpanOption, causing the
// newly-created Span to be a root span even if `ctx` contains a Span.
//
// When creating a Span it is recommended to provide all known span attributes using
// the `WithAttributes()` SpanOption as samplers will only have access to the
// attributes provided when a Span is created.
//
// Any Span that is created MUST also be ended. This is the responsibility of the user.
// Implementations of this API may leak memory or other resources if Spans are not ended.
Start(ctx context.Context, spanName string, opts ...SpanStartOption) (context.Context, Span)
}

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// Copyright The OpenTelemetry Authors
// SPDX-License-Identifier: Apache-2.0
package trace // import "go.opentelemetry.io/otel/trace"
import (
"encoding/json"
"fmt"
"strings"
)
const (
maxListMembers = 32
listDelimiters = ","
memberDelimiter = "="
errInvalidKey errorConst = "invalid tracestate key"
errInvalidValue errorConst = "invalid tracestate value"
errInvalidMember errorConst = "invalid tracestate list-member"
errMemberNumber errorConst = "too many list-members in tracestate"
errDuplicate errorConst = "duplicate list-member in tracestate"
)
type member struct {
Key string
Value string
}
// according to (chr = %x20 / (nblk-char = %x21-2B / %x2D-3C / %x3E-7E) )
// means (chr = %x20-2B / %x2D-3C / %x3E-7E) .
func checkValueChar(v byte) bool {
return v >= '\x20' && v <= '\x7e' && v != '\x2c' && v != '\x3d'
}
// according to (nblk-chr = %x21-2B / %x2D-3C / %x3E-7E) .
func checkValueLast(v byte) bool {
return v >= '\x21' && v <= '\x7e' && v != '\x2c' && v != '\x3d'
}
// based on the W3C Trace Context specification
//
// value = (0*255(chr)) nblk-chr
// nblk-chr = %x21-2B / %x2D-3C / %x3E-7E
// chr = %x20 / nblk-chr
//
// see https://www.w3.org/TR/trace-context-1/#value
func checkValue(val string) bool {
n := len(val)
if n == 0 || n > 256 {
return false
}
for i := 0; i < n-1; i++ {
if !checkValueChar(val[i]) {
return false
}
}
return checkValueLast(val[n-1])
}
func checkKeyRemain(key string) bool {
// ( lcalpha / DIGIT / "_" / "-"/ "*" / "/" )
for _, v := range key {
if isAlphaNum(byte(v)) {
continue
}
switch v {
case '_', '-', '*', '/':
continue
}
return false
}
return true
}
// according to
//
// simple-key = lcalpha (0*255( lcalpha / DIGIT / "_" / "-"/ "*" / "/" ))
// system-id = lcalpha (0*13( lcalpha / DIGIT / "_" / "-"/ "*" / "/" ))
//
// param n is remain part length, should be 255 in simple-key or 13 in system-id.
func checkKeyPart(key string, n int) bool {
if len(key) == 0 {
return false
}
first := key[0] // key's first char
ret := len(key[1:]) <= n
ret = ret && first >= 'a' && first <= 'z'
return ret && checkKeyRemain(key[1:])
}
func isAlphaNum(c byte) bool {
if c >= 'a' && c <= 'z' {
return true
}
return c >= '0' && c <= '9'
}
// according to
//
// tenant-id = ( lcalpha / DIGIT ) 0*240( lcalpha / DIGIT / "_" / "-"/ "*" / "/" )
//
// param n is remain part length, should be 240 exactly.
func checkKeyTenant(key string, n int) bool {
if len(key) == 0 {
return false
}
return isAlphaNum(key[0]) && len(key[1:]) <= n && checkKeyRemain(key[1:])
}
// based on the W3C Trace Context specification
//
// key = simple-key / multi-tenant-key
// simple-key = lcalpha (0*255( lcalpha / DIGIT / "_" / "-"/ "*" / "/" ))
// multi-tenant-key = tenant-id "@" system-id
// tenant-id = ( lcalpha / DIGIT ) (0*240( lcalpha / DIGIT / "_" / "-"/ "*" / "/" ))
// system-id = lcalpha (0*13( lcalpha / DIGIT / "_" / "-"/ "*" / "/" ))
// lcalpha = %x61-7A ; a-z
//
// see https://www.w3.org/TR/trace-context-1/#tracestate-header.
func checkKey(key string) bool {
tenant, system, ok := strings.Cut(key, "@")
if !ok {
return checkKeyPart(key, 255)
}
return checkKeyTenant(tenant, 240) && checkKeyPart(system, 13)
}
func newMember(key, value string) (member, error) {
if !checkKey(key) {
return member{}, errInvalidKey
}
if !checkValue(value) {
return member{}, errInvalidValue
}
return member{Key: key, Value: value}, nil
}
func parseMember(m string) (member, error) {
key, val, ok := strings.Cut(m, memberDelimiter)
if !ok {
return member{}, fmt.Errorf("%w: %s", errInvalidMember, m)
}
key = strings.TrimLeft(key, " \t")
val = strings.TrimRight(val, " \t")
result, e := newMember(key, val)
if e != nil {
return member{}, fmt.Errorf("%w: %s", errInvalidMember, m)
}
return result, nil
}
// String encodes member into a string compliant with the W3C Trace Context
// specification.
func (m member) String() string {
return m.Key + "=" + m.Value
}
// TraceState provides additional vendor-specific trace identification
// information across different distributed tracing systems. It represents an
// immutable list consisting of key/value pairs, each pair is referred to as a
// list-member.
//
// TraceState conforms to the W3C Trace Context specification
// (https://www.w3.org/TR/trace-context-1). All operations that create or copy
// a TraceState do so by validating all input and will only produce TraceState
// that conform to the specification. Specifically, this means that all
// list-member's key/value pairs are valid, no duplicate list-members exist,
// and the maximum number of list-members (32) is not exceeded.
type TraceState struct { //nolint:revive // revive complains about stutter of `trace.TraceState`
// list is the members in order.
list []member
}
var _ json.Marshaler = TraceState{}
// ParseTraceState attempts to decode a TraceState from the passed
// string. It returns an error if the input is invalid according to the W3C
// Trace Context specification.
func ParseTraceState(ts string) (TraceState, error) {
if ts == "" {
return TraceState{}, nil
}
wrapErr := func(err error) error {
return fmt.Errorf("failed to parse tracestate: %w", err)
}
var members []member
found := make(map[string]struct{})
for ts != "" {
var memberStr string
memberStr, ts, _ = strings.Cut(ts, listDelimiters)
if len(memberStr) == 0 {
continue
}
m, err := parseMember(memberStr)
if err != nil {
return TraceState{}, wrapErr(err)
}
if _, ok := found[m.Key]; ok {
return TraceState{}, wrapErr(errDuplicate)
}
found[m.Key] = struct{}{}
members = append(members, m)
if n := len(members); n > maxListMembers {
return TraceState{}, wrapErr(errMemberNumber)
}
}
return TraceState{list: members}, nil
}
// MarshalJSON marshals the TraceState into JSON.
func (ts TraceState) MarshalJSON() ([]byte, error) {
return json.Marshal(ts.String())
}
// String encodes the TraceState into a string compliant with the W3C
// Trace Context specification. The returned string will be invalid if the
// TraceState contains any invalid members.
func (ts TraceState) String() string {
if len(ts.list) == 0 {
return ""
}
var n int
n += len(ts.list) // member delimiters: '='
n += len(ts.list) - 1 // list delimiters: ','
for _, mem := range ts.list {
n += len(mem.Key)
n += len(mem.Value)
}
var sb strings.Builder
sb.Grow(n)
_, _ = sb.WriteString(ts.list[0].Key)
_ = sb.WriteByte('=')
_, _ = sb.WriteString(ts.list[0].Value)
for i := 1; i < len(ts.list); i++ {
_ = sb.WriteByte(listDelimiters[0])
_, _ = sb.WriteString(ts.list[i].Key)
_ = sb.WriteByte('=')
_, _ = sb.WriteString(ts.list[i].Value)
}
return sb.String()
}
// Get returns the value paired with key from the corresponding TraceState
// list-member if it exists, otherwise an empty string is returned.
func (ts TraceState) Get(key string) string {
for _, member := range ts.list {
if member.Key == key {
return member.Value
}
}
return ""
}
// Walk walks all key value pairs in the TraceState by calling f
// Iteration stops if f returns false.
func (ts TraceState) Walk(f func(key, value string) bool) {
for _, m := range ts.list {
if !f(m.Key, m.Value) {
break
}
}
}
// Insert adds a new list-member defined by the key/value pair to the
// TraceState. If a list-member already exists for the given key, that
// list-member's value is updated. The new or updated list-member is always
// moved to the beginning of the TraceState as specified by the W3C Trace
// Context specification.
//
// If key or value are invalid according to the W3C Trace Context
// specification an error is returned with the original TraceState.
//
// If adding a new list-member means the TraceState would have more members
// then is allowed, the new list-member will be inserted and the right-most
// list-member will be dropped in the returned TraceState.
func (ts TraceState) Insert(key, value string) (TraceState, error) {
m, err := newMember(key, value)
if err != nil {
return ts, err
}
n := len(ts.list)
found := n
for i := range ts.list {
if ts.list[i].Key == key {
found = i
}
}
cTS := TraceState{}
if found == n && n < maxListMembers {
cTS.list = make([]member, n+1)
} else {
cTS.list = make([]member, n)
}
cTS.list[0] = m
// When the number of members exceeds capacity, drop the "right-most".
copy(cTS.list[1:], ts.list[0:found])
if found < n {
copy(cTS.list[1+found:], ts.list[found+1:])
}
return cTS, nil
}
// Delete returns a copy of the TraceState with the list-member identified by
// key removed.
func (ts TraceState) Delete(key string) TraceState {
members := make([]member, ts.Len())
copy(members, ts.list)
for i, member := range ts.list {
if member.Key == key {
members = append(members[:i], members[i+1:]...)
// TraceState should contain no duplicate members.
break
}
}
return TraceState{list: members}
}
// Len returns the number of list-members in the TraceState.
func (ts TraceState) Len() int {
return len(ts.list)
}