go.uber.org/cadence@v1.2.9/internal/propagation.go (about)

     1  // Copyright (c) 2017 Uber Technologies, Inc.
     2  //
     3  // Permission is hereby granted, free of charge, to any person obtaining a copy
     4  // of this software and associated documentation files (the "Software"), to deal
     5  // in the Software without restriction, including without limitation the rights
     6  // to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
     7  // copies of the Software, and to permit persons to whom the Software is
     8  // furnished to do so, subject to the following conditions:
     9  //
    10  // The above copyright notice and this permission notice shall be included in
    11  // all copies or substantial portions of the Software.
    12  //
    13  // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
    14  // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
    15  // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
    16  // AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
    17  // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
    18  // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
    19  // THE SOFTWARE.
    20  
    21  package internal
    22  
    23  import (
    24  	"context"
    25  	"time"
    26  
    27  	"github.com/opentracing/opentracing-go"
    28  )
    29  
    30  const (
    31  	workflowTag = "cadenceWorkflowID"
    32  
    33  	runTag = "cadenceRunID"
    34  )
    35  
    36  // createOpenTracingWorkflowSpan creates a new context with a workflow started span
    37  func createOpenTracingWorkflowSpan(
    38  	ctx context.Context,
    39  	tracer opentracing.Tracer,
    40  	start time.Time,
    41  	workflowType, workflowID string,
    42  ) (context.Context, opentracing.Span) {
    43  	tags := opentracing.Tags{
    44  		workflowTag: workflowID,
    45  	}
    46  	return createOpenTracingSpan(ctx, tracer, start, workflowType, tags)
    47  }
    48  
    49  // createOpenTracingActivitySpan creates a new context with an activity started span
    50  func createOpenTracingActivitySpan(
    51  	ctx context.Context,
    52  	tracer opentracing.Tracer,
    53  	start time.Time,
    54  	activityType, workflowID, runID string,
    55  ) (context.Context, opentracing.Span) {
    56  	tags := opentracing.Tags{
    57  		workflowTag: workflowID,
    58  		runTag:      runID,
    59  	}
    60  	return createOpenTracingSpan(ctx, tracer, start, activityType, tags)
    61  }
    62  
    63  func createOpenTracingSpan(
    64  	ctx context.Context,
    65  	tracer opentracing.Tracer,
    66  	start time.Time,
    67  	name string,
    68  	tags opentracing.Tags,
    69  ) (context.Context, opentracing.Span) {
    70  	if _, ok := tracer.(opentracing.NoopTracer); ok {
    71  		return ctx, tracer.StartSpan("StartWorkflow-Span")
    72  	}
    73  
    74  	var parent opentracing.SpanContext
    75  	if parentSpan := opentracing.SpanFromContext(ctx); parentSpan != nil {
    76  		parent = parentSpan.Context()
    77  	} else if spanCtx, ok := ctx.Value(activeSpanContextKey).(opentracing.SpanContext); ok {
    78  		parent = spanCtx
    79  	}
    80  
    81  	span := tracer.StartSpan(
    82  		name,
    83  		opentracing.StartTime(start),
    84  		opentracing.FollowsFrom(parent),
    85  		tags,
    86  	)
    87  
    88  	ctx = opentracing.ContextWithSpan(ctx, span)
    89  	return ctx, span
    90  }