From 8c12c6939aab9106db14ec2d11d983bc5b29fb2c Mon Sep 17 00:00:00 2001
From: Niall Sheridan <nsheridan@gmail.com>
Date: Sun, 7 Jul 2019 21:33:44 +0100
Subject: Switch to modules

---
 .../plugin/ochttp/propagation/b3/b3.go             | 123 ---------------------
 1 file changed, 123 deletions(-)
 delete mode 100644 vendor/go.opencensus.io/plugin/ochttp/propagation/b3/b3.go

(limited to 'vendor/go.opencensus.io/plugin/ochttp/propagation')

diff --git a/vendor/go.opencensus.io/plugin/ochttp/propagation/b3/b3.go b/vendor/go.opencensus.io/plugin/ochttp/propagation/b3/b3.go
deleted file mode 100644
index f777772..0000000
--- a/vendor/go.opencensus.io/plugin/ochttp/propagation/b3/b3.go
+++ /dev/null
@@ -1,123 +0,0 @@
-// Copyright 2018, OpenCensus 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.
-
-// Package b3 contains a propagation.HTTPFormat implementation
-// for B3 propagation. See https://github.com/openzipkin/b3-propagation
-// for more details.
-package b3 // import "go.opencensus.io/plugin/ochttp/propagation/b3"
-
-import (
-	"encoding/hex"
-	"net/http"
-
-	"go.opencensus.io/trace"
-	"go.opencensus.io/trace/propagation"
-)
-
-// B3 headers that OpenCensus understands.
-const (
-	TraceIDHeader = "X-B3-TraceId"
-	SpanIDHeader  = "X-B3-SpanId"
-	SampledHeader = "X-B3-Sampled"
-)
-
-// HTTPFormat implements propagation.HTTPFormat to propagate
-// traces in HTTP headers in B3 propagation format.
-// HTTPFormat skips the X-B3-ParentId and X-B3-Flags headers
-// because there are additional fields not represented in the
-// OpenCensus span context. Spans created from the incoming
-// header will be the direct children of the client-side span.
-// Similarly, reciever of the outgoing spans should use client-side
-// span created by OpenCensus as the parent.
-type HTTPFormat struct{}
-
-var _ propagation.HTTPFormat = (*HTTPFormat)(nil)
-
-// SpanContextFromRequest extracts a B3 span context from incoming requests.
-func (f *HTTPFormat) SpanContextFromRequest(req *http.Request) (sc trace.SpanContext, ok bool) {
-	tid, ok := ParseTraceID(req.Header.Get(TraceIDHeader))
-	if !ok {
-		return trace.SpanContext{}, false
-	}
-	sid, ok := ParseSpanID(req.Header.Get(SpanIDHeader))
-	if !ok {
-		return trace.SpanContext{}, false
-	}
-	sampled, _ := ParseSampled(req.Header.Get(SampledHeader))
-	return trace.SpanContext{
-		TraceID:      tid,
-		SpanID:       sid,
-		TraceOptions: sampled,
-	}, true
-}
-
-// ParseTraceID parses the value of the X-B3-TraceId header.
-func ParseTraceID(tid string) (trace.TraceID, bool) {
-	if tid == "" {
-		return trace.TraceID{}, false
-	}
-	b, err := hex.DecodeString(tid)
-	if err != nil {
-		return trace.TraceID{}, false
-	}
-	var traceID trace.TraceID
-	if len(b) <= 8 {
-		// The lower 64-bits.
-		start := 8 + (8 - len(b))
-		copy(traceID[start:], b)
-	} else {
-		start := 16 - len(b)
-		copy(traceID[start:], b)
-	}
-
-	return traceID, true
-}
-
-// ParseSpanID parses the value of the X-B3-SpanId or X-B3-ParentSpanId headers.
-func ParseSpanID(sid string) (spanID trace.SpanID, ok bool) {
-	if sid == "" {
-		return trace.SpanID{}, false
-	}
-	b, err := hex.DecodeString(sid)
-	if err != nil {
-		return trace.SpanID{}, false
-	}
-	start := 8 - len(b)
-	copy(spanID[start:], b)
-	return spanID, true
-}
-
-// ParseSampled parses the value of the X-B3-Sampled header.
-func ParseSampled(sampled string) (trace.TraceOptions, bool) {
-	switch sampled {
-	case "true", "1":
-		return trace.TraceOptions(1), true
-	default:
-		return trace.TraceOptions(0), false
-	}
-}
-
-// SpanContextToRequest modifies the given request to include B3 headers.
-func (f *HTTPFormat) SpanContextToRequest(sc trace.SpanContext, req *http.Request) {
-	req.Header.Set(TraceIDHeader, hex.EncodeToString(sc.TraceID[:]))
-	req.Header.Set(SpanIDHeader, hex.EncodeToString(sc.SpanID[:]))
-
-	var sampled string
-	if sc.IsSampled() {
-		sampled = "1"
-	} else {
-		sampled = "0"
-	}
-	req.Header.Set(SampledHeader, sampled)
-}
-- 
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