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Original file line number | Diff line number | Diff line change |
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package tracing | ||
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||
import ( | ||
"github.com/Jeffail/benthos/v3/lib/message" | ||
"github.com/Jeffail/benthos/v3/lib/types" | ||
"github.com/opentracing/opentracing-go" | ||
) | ||
|
||
// GetSpan returns a span attached to a message part. Returns nil if the part | ||
// doesn't have a span attached. | ||
func GetSpan(p types.Part) *Span { | ||
return openTracingSpan(opentracing.SpanFromContext(message.GetContext(p))) | ||
} | ||
|
||
// CreateChildSpan takes a message part, extracts an existing span if there is | ||
// one and returns child span. | ||
func CreateChildSpan(operationName string, part types.Part) *Span { | ||
span := GetSpan(part) | ||
if span == nil { | ||
span = openTracingSpan(opentracing.StartSpan(operationName)) | ||
} else { | ||
span = openTracingSpan(opentracing.StartSpan( | ||
operationName, | ||
opentracing.ChildOf(span.unwrap().Context()), | ||
)) | ||
} | ||
return span | ||
} | ||
|
||
// CreateChildSpans takes a message, extracts spans per message part and returns | ||
// a slice of child spans. The length of the returned slice is guaranteed to | ||
// match the message size. | ||
func CreateChildSpans(operationName string, msg types.Message) []*Span { | ||
spans := make([]*Span, msg.Len()) | ||
msg.Iter(func(i int, part types.Part) error { | ||
spans[i] = CreateChildSpan(operationName, part) | ||
return nil | ||
}) | ||
return spans | ||
} | ||
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||
// PartsWithChildSpans takes a slice of message parts, extracts spans per part, | ||
// creates new child spans, and returns a new slice of parts with those spans | ||
// embedded. The original parts are unchanged. | ||
func PartsWithChildSpans(operationName string, parts []types.Part) ([]types.Part, []*Span) { | ||
spans := make([]*Span, 0, len(parts)) | ||
newParts := make([]types.Part, len(parts)) | ||
for i, part := range parts { | ||
if part == nil { | ||
continue | ||
} | ||
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||
ctx := message.GetContext(part) | ||
otSpan := opentracing.SpanFromContext(ctx) | ||
if otSpan == nil { | ||
otSpan = opentracing.StartSpan(operationName) | ||
} else { | ||
otSpan = opentracing.StartSpan( | ||
operationName, | ||
opentracing.ChildOf(otSpan.Context()), | ||
) | ||
} | ||
ctx = opentracing.ContextWithSpan(ctx, otSpan) | ||
|
||
newParts[i] = message.WithContext(ctx, part) | ||
spans = append(spans, openTracingSpan(otSpan)) | ||
} | ||
return newParts, spans | ||
} | ||
|
||
// WithChildSpans takes a message, extracts spans per message part, creates new | ||
// child spans, and returns a new message with those spans embedded. The | ||
// original message is unchanged. | ||
func WithChildSpans(operationName string, msg types.Message) (types.Message, []*Span) { | ||
parts := make([]types.Part, 0, msg.Len()) | ||
msg.Iter(func(i int, p types.Part) error { | ||
parts = append(parts, p) | ||
return nil | ||
}) | ||
|
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newParts, spans := PartsWithChildSpans(operationName, parts) | ||
newMsg := message.New(nil) | ||
newMsg.SetAll(newParts) | ||
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return newMsg, spans | ||
} | ||
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||
// WithSiblingSpans takes a message, extracts spans per message part, creates | ||
// new sibling spans, and returns a new message with those spans embedded. The | ||
// original message is unchanged. | ||
func WithSiblingSpans(operationName string, msg types.Message) types.Message { | ||
parts := make([]types.Part, msg.Len()) | ||
msg.Iter(func(i int, part types.Part) error { | ||
ctx := message.GetContext(part) | ||
otSpan := opentracing.SpanFromContext(ctx) | ||
if otSpan == nil { | ||
otSpan = opentracing.StartSpan(operationName) | ||
} else { | ||
otSpan = opentracing.StartSpan( | ||
operationName, | ||
opentracing.FollowsFrom(otSpan.Context()), | ||
) | ||
} | ||
ctx = opentracing.ContextWithSpan(ctx, otSpan) | ||
parts[i] = message.WithContext(ctx, part) | ||
return nil | ||
}) | ||
|
||
newMsg := message.New(nil) | ||
newMsg.SetAll(parts) | ||
return newMsg | ||
} | ||
|
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//------------------------------------------------------------------------------ | ||
|
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// IterateWithChildSpans iterates all the parts of a message and, for each part, | ||
// creates a new span from an existing span attached to the part and calls a | ||
// func with that span before finishing the child span. | ||
func IterateWithChildSpans(operationName string, msg types.Message, iter func(int, *Span, types.Part) error) error { | ||
return msg.Iter(func(i int, p types.Part) error { | ||
otSpan, _ := opentracing.StartSpanFromContext(message.GetContext(p), operationName) | ||
err := iter(i, openTracingSpan(otSpan), p) | ||
otSpan.Finish() | ||
return err | ||
}) | ||
} | ||
|
||
// InitSpans sets up OpenTracing spans on each message part if one does not | ||
// already exist. | ||
func InitSpans(operationName string, msg types.Message) { | ||
tracedParts := make([]types.Part, msg.Len()) | ||
msg.Iter(func(i int, p types.Part) error { | ||
tracedParts[i] = InitSpan(operationName, p) | ||
return nil | ||
}) | ||
msg.SetAll(tracedParts) | ||
} | ||
|
||
// InitSpan sets up an OpenTracing span on a message part if one does not | ||
// already exist. | ||
func InitSpan(operationName string, part types.Part) types.Part { | ||
if GetSpan(part) != nil { | ||
return part | ||
} | ||
otSpan := opentracing.StartSpan(operationName) | ||
ctx := opentracing.ContextWithSpan(message.GetContext(part), otSpan) | ||
return message.WithContext(ctx, part) | ||
} | ||
|
||
// InitSpansFromParent sets up OpenTracing spans as children of a parent span on | ||
// each message part if one does not already exist. | ||
func InitSpansFromParent(operationName string, parent *Span, msg types.Message) { | ||
tracedParts := make([]types.Part, msg.Len()) | ||
msg.Iter(func(i int, p types.Part) error { | ||
tracedParts[i] = InitSpanFromParent(operationName, parent, p) | ||
return nil | ||
}) | ||
msg.SetAll(tracedParts) | ||
} | ||
|
||
// InitSpanFromParent sets up an OpenTracing span as children of a parent | ||
// span on a message part if one does not already exist. | ||
func InitSpanFromParent(operationName string, parent *Span, part types.Part) types.Part { | ||
if GetSpan(part) != nil { | ||
return part | ||
} | ||
span := opentracing.StartSpan(operationName, opentracing.ChildOf(parent.unwrap().Context())) | ||
ctx := opentracing.ContextWithSpan(message.GetContext(part), span) | ||
return message.WithContext(ctx, part) | ||
} | ||
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||
// InitSpansFromParentTextMap obtains a span parent reference from a text map | ||
// and creates child spans for each message. | ||
func InitSpansFromParentTextMap(operationName string, textMapGeneric map[string]interface{}, msg types.Message) error { | ||
textMap := make(opentracing.TextMapCarrier, len(textMapGeneric)) | ||
for k, v := range textMapGeneric { | ||
if vStr, ok := v.(string); ok { | ||
textMap[k] = vStr | ||
} | ||
} | ||
|
||
parentCtx, err := opentracing.GlobalTracer().Extract(opentracing.TextMap, textMap) | ||
if err != nil { | ||
return err | ||
} | ||
|
||
tracedParts := make([]types.Part, msg.Len()) | ||
msg.Iter(func(i int, p types.Part) error { | ||
otSpan := opentracing.StartSpan( | ||
operationName, | ||
opentracing.ChildOf(parentCtx), | ||
) | ||
ctx := opentracing.ContextWithSpan(message.GetContext(p), otSpan) | ||
tracedParts[i] = message.WithContext(ctx, p) | ||
return nil | ||
}) | ||
|
||
msg.SetAll(tracedParts) | ||
return nil | ||
} | ||
|
||
// FinishSpans calls Finish on all message parts containing a span. | ||
func FinishSpans(msg types.Message) { | ||
msg.Iter(func(i int, p types.Part) error { | ||
span := GetSpan(p) | ||
if span == nil { | ||
return nil | ||
} | ||
span.unwrap().Finish() | ||
return nil | ||
}) | ||
} |
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