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tracespan_handler.gen.go
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tracespan_handler.gen.go
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// Copyright 2017 Istio Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// THIS FILE IS AUTOMATICALLY GENERATED.
package tracespan
import (
"context"
"time"
"istio.io/istio/mixer/pkg/adapter"
)
// The `tracespan` template represents an individual span within a distributed trace.
//
// Example config:
//
// ```yaml
// apiVersion: "config.istio.io/v1alpha2"
// kind: tracespan
// metadata:
// name: default
// namespace: istio-system
// spec:
// traceId: request.headers["x-b3-traceid"]
// spanId: request.headers["x-b3-spanid"] | ""
// parentSpanId: request.headers["x-b3-parentspanid"] | ""
// spanName: request.path | "/"
// startTime: request.time
// endTime: response.time
// clientSpan: (context.reporter.local | true) == false
// rewriteClientSpanId: false
// spanTags:
// http.method: request.method | ""
// http.status_code: response.code | 200
// http.url: request.path | ""
// request.size: request.size | 0
// response.size: response.size | 0
// source.ip: source.ip | ip("0.0.0.0")
// source.service: source.service | ""
// source.user: source.user | ""
// source.version: source.labels["version"] | ""
// ```
//
// See also: [Distributed Tracing](https://istio.io/docs/tasks/telemetry/distributed-tracing/)
// for information on tracing within Istio.
// Fully qualified name of the template
const TemplateName = "tracespan"
// Instance is constructed by Mixer for the 'tracespan' template.
//
// TraceSpan represents an individual span within a distributed trace.
//
// When writing the configuration, the value for the fields associated with this template can either be a
// literal or an [expression](https://istio.io/docs/reference//config/policy-and-telemetry/expression-language/). Please note that if the datatype of a field is not istio.policy.v1beta1.Value,
// then the expression's [inferred type](https://istio.io/docs/reference//config/policy-and-telemetry/expression-language/#type-checking) must match the datatype of the field.
type Instance struct {
// Name of the instance as specified in configuration.
Name string
// Trace ID is the unique identifier for a trace. All spans from the same
// trace share the same Trace ID.
//
// Required.
TraceId string
// Span ID is the unique identifier for a span within a trace. It is assigned
// when the span is created.
//
// Optional.
SpanId string
// Parent Span ID is the unique identifier for a parent span of this span
// instance. If this is a root span, then this field MUST be empty.
//
// Optional.
ParentSpanId string
// Span name is a description of the span's operation.
//
// For example, the name can be a qualified method name or a file name
// and a line number where the operation is called. A best practice is to use
// the same display name within an application and at the same call point.
// This makes it easier to correlate spans in different traces.
//
// Required.
SpanName string
// The start time of the span.
//
// Required.
StartTime time.Time
// The end time of the span.
//
// Required.
EndTime time.Time
// Span tags are a set of < key, value > pairs that provide metadata for the
// entire span. The values can be specified in the form of expressions.
//
// Optional.
SpanTags map[string]interface{}
// HTTP status code used to set the span status. If unset or set to 0, the
// span status will be assumed to be successful.
HttpStatusCode int64
// client_span indicates the span kind. True for client spans and False or
// not provided for server spans. Using bool instead of enum is a temporary
// work around since mixer expression language does not yet support enum
// type.
//
// Optional
ClientSpan bool
// rewrite_client_span_id is used to indicate whether to create a new client
// span id to accommodate Zipkin shared span model. Some tracing systems like
// Stackdriver separates a RPC into client span and server span. To solve this
// incompatibility, deterministically rewriting both span id of client span and
// parent span id of server span to the same newly generated id.
//
// Optional
RewriteClientSpanId bool
}
// HandlerBuilder must be implemented by adapters if they want to
// process data associated with the 'tracespan' template.
//
// Mixer uses this interface to call into the adapter at configuration time to configure
// it with adapter-specific configuration as well as all template-specific type information.
type HandlerBuilder interface {
adapter.HandlerBuilder
// SetTraceSpanTypes is invoked by Mixer to pass the template-specific Type information for instances that an adapter
// may receive at runtime. The type information describes the shape of the instance.
SetTraceSpanTypes(map[string]*Type /*Instance name -> Type*/)
}
// Handler must be implemented by adapter code if it wants to
// process data associated with the 'tracespan' template.
//
// Mixer uses this interface to call into the adapter at request time in order to dispatch
// created instances to the adapter. Adapters take the incoming instances and do what they
// need to achieve their primary function.
//
// The name of each instance can be used as a key into the Type map supplied to the adapter
// at configuration time via the method 'SetTraceSpanTypes'.
// These Type associated with an instance describes the shape of the instance
type Handler interface {
adapter.Handler
// HandleTraceSpan is called by Mixer at request time to deliver instances to
// to an adapter.
HandleTraceSpan(context.Context, []*Instance) error
}