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This reverts commit df6bd80.
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Ramon Nogueira
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Aug 2, 2018
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df6bd80
commit 745e4f4
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// 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. | ||
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// Package propagation implement X-Cloud-Trace-Context header propagation used | ||
// by Google Cloud products. | ||
package propagation // import "go.opencensus.io/exporter/stackdriver/propagation" | ||
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import ( | ||
"encoding/binary" | ||
"encoding/hex" | ||
"fmt" | ||
"net/http" | ||
"strconv" | ||
"strings" | ||
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"go.opencensus.io/trace" | ||
"go.opencensus.io/trace/propagation" | ||
) | ||
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const ( | ||
httpHeaderMaxSize = 200 | ||
httpHeader = `X-Cloud-Trace-Context` | ||
) | ||
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var _ propagation.HTTPFormat = (*HTTPFormat)(nil) | ||
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// HTTPFormat implements propagation.HTTPFormat to propagate | ||
// traces in HTTP headers for Google Cloud Platform and Stackdriver Trace. | ||
type HTTPFormat struct{} | ||
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// SpanContextFromRequest extracts a Stackdriver Trace span context from incoming requests. | ||
func (f *HTTPFormat) SpanContextFromRequest(req *http.Request) (sc trace.SpanContext, ok bool) { | ||
h := req.Header.Get(httpHeader) | ||
// See https://cloud.google.com/trace/docs/faq for the header HTTPFormat. | ||
// Return if the header is empty or missing, or if the header is unreasonably | ||
// large, to avoid making unnecessary copies of a large string. | ||
if h == "" || len(h) > httpHeaderMaxSize { | ||
return trace.SpanContext{}, false | ||
} | ||
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// Parse the trace id field. | ||
slash := strings.Index(h, `/`) | ||
if slash == -1 { | ||
return trace.SpanContext{}, false | ||
} | ||
tid, h := h[:slash], h[slash+1:] | ||
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buf, err := hex.DecodeString(tid) | ||
if err != nil { | ||
return trace.SpanContext{}, false | ||
} | ||
copy(sc.TraceID[:], buf) | ||
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// Parse the span id field. | ||
spanstr := h | ||
semicolon := strings.Index(h, `;`) | ||
if semicolon != -1 { | ||
spanstr, h = h[:semicolon], h[semicolon+1:] | ||
} | ||
sid, err := strconv.ParseUint(spanstr, 10, 64) | ||
if err != nil { | ||
return trace.SpanContext{}, false | ||
} | ||
binary.BigEndian.PutUint64(sc.SpanID[:], sid) | ||
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// Parse the options field, options field is optional. | ||
if !strings.HasPrefix(h, "o=") { | ||
return sc, true | ||
} | ||
o, err := strconv.ParseUint(h[2:], 10, 64) | ||
if err != nil { | ||
return trace.SpanContext{}, false | ||
} | ||
sc.TraceOptions = trace.TraceOptions(o) | ||
return sc, true | ||
} | ||
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// SpanContextToRequest modifies the given request to include a Stackdriver Trace header. | ||
func (f *HTTPFormat) SpanContextToRequest(sc trace.SpanContext, req *http.Request) { | ||
sid := binary.BigEndian.Uint64(sc.SpanID[:]) | ||
header := fmt.Sprintf("%s/%d;o=%d", hex.EncodeToString(sc.TraceID[:]), sid, int64(sc.TraceOptions)) | ||
req.Header.Set(httpHeader, header) | ||
} |
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// 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. | ||
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package propagation | ||
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import ( | ||
"net/http" | ||
"reflect" | ||
"testing" | ||
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"go.opencensus.io/trace" | ||
) | ||
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func TestHTTPFormat(t *testing.T) { | ||
format := &HTTPFormat{} | ||
traceID := [16]byte{16, 84, 69, 170, 120, 67, 188, 139, 242, 6, 177, 32, 0, 16, 0, 0} | ||
spanID1 := [8]byte{255, 0, 0, 0, 0, 0, 0, 123} | ||
spanID2 := [8]byte{0, 0, 0, 0, 0, 0, 0, 123} | ||
tests := []struct { | ||
incoming string | ||
wantSpanContext trace.SpanContext | ||
}{ | ||
{ | ||
incoming: "105445aa7843bc8bf206b12000100000/18374686479671623803;o=1", | ||
wantSpanContext: trace.SpanContext{ | ||
TraceID: traceID, | ||
SpanID: spanID1, | ||
TraceOptions: 1, | ||
}, | ||
}, | ||
{ | ||
incoming: "105445aa7843bc8bf206b12000100000/123;o=0", | ||
wantSpanContext: trace.SpanContext{ | ||
TraceID: traceID, | ||
SpanID: spanID2, | ||
TraceOptions: 0, | ||
}, | ||
}, | ||
} | ||
for _, tt := range tests { | ||
t.Run(tt.incoming, func(t *testing.T) { | ||
req, _ := http.NewRequest("GET", "http://example.com", nil) | ||
req.Header.Add(httpHeader, tt.incoming) | ||
sc, ok := format.SpanContextFromRequest(req) | ||
if !ok { | ||
t.Errorf("exporter.SpanContextFromRequest() = false; want true") | ||
} | ||
if got, want := sc, tt.wantSpanContext; !reflect.DeepEqual(got, want) { | ||
t.Errorf("exporter.SpanContextFromRequest() returned span context %v; want %v", got, want) | ||
} | ||
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req, _ = http.NewRequest("GET", "http://example.com", nil) | ||
format.SpanContextToRequest(sc, req) | ||
if got, want := req.Header.Get(httpHeader), tt.incoming; got != want { | ||
t.Errorf("exporter.SpanContextToRequest() returned header %q; want %q", got, want) | ||
} | ||
}) | ||
} | ||
} |
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// 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. | ||
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// Package stackdriver has moved. | ||
// | ||
// Deprecated: Use contrib.go.opencensus.io/exporter/stackdriver instead. | ||
package stackdriver // import "go.opencensus.io/exporter/stackdriver" | ||
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import ( | ||
"context" | ||
"errors" | ||
"fmt" | ||
"log" | ||
"time" | ||
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traceapi "cloud.google.com/go/trace/apiv2" | ||
"go.opencensus.io/stats/view" | ||
"go.opencensus.io/trace" | ||
"golang.org/x/oauth2/google" | ||
"google.golang.org/api/option" | ||
monitoredrespb "google.golang.org/genproto/googleapis/api/monitoredres" | ||
) | ||
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// Options contains options for configuring the exporter. | ||
// | ||
// Deprecated: This package has been moved to: contrib.go.opencensus.io/exporter/stackdriver. | ||
type Options struct { | ||
// ProjectID is the identifier of the Stackdriver | ||
// project the user is uploading the stats data to. | ||
// If not set, this will default to your "Application Default Credentials". | ||
// For details see: https://developers.google.com/accounts/docs/application-default-credentials | ||
ProjectID string | ||
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// OnError is the hook to be called when there is | ||
// an error uploading the stats or tracing data. | ||
// If no custom hook is set, errors are logged. | ||
// Optional. | ||
OnError func(err error) | ||
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// MonitoringClientOptions are additional options to be passed | ||
// to the underlying Stackdriver Monitoring API client. | ||
// Optional. | ||
MonitoringClientOptions []option.ClientOption | ||
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// TraceClientOptions are additional options to be passed | ||
// to the underlying Stackdriver Trace API client. | ||
// Optional. | ||
TraceClientOptions []option.ClientOption | ||
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// BundleDelayThreshold determines the max amount of time | ||
// the exporter can wait before uploading view data to | ||
// the backend. | ||
// Optional. | ||
BundleDelayThreshold time.Duration | ||
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// BundleCountThreshold determines how many view data events | ||
// can be buffered before batch uploading them to the backend. | ||
// Optional. | ||
BundleCountThreshold int | ||
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// Resource is an optional field that represents the Stackdriver | ||
// MonitoredResource, a resource that can be used for monitoring. | ||
// If no custom ResourceDescriptor is set, a default MonitoredResource | ||
// with type global and no resource labels will be used. | ||
// Optional. | ||
Resource *monitoredrespb.MonitoredResource | ||
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// MetricPrefix overrides the OpenCensus prefix of a stackdriver metric. | ||
// Optional. | ||
MetricPrefix string | ||
} | ||
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// Exporter is a stats.Exporter and trace.Exporter | ||
// implementation that uploads data to Stackdriver. | ||
// | ||
// Deprecated: This package has been moved to: contrib.go.opencensus.io/exporter/stackdriver. | ||
type Exporter struct { | ||
traceExporter *traceExporter | ||
statsExporter *statsExporter | ||
} | ||
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// NewExporter creates a new Exporter that implements both stats.Exporter and | ||
// trace.Exporter. | ||
// | ||
// Deprecated: This package has been moved to: contrib.go.opencensus.io/exporter/stackdriver. | ||
func NewExporter(o Options) (*Exporter, error) { | ||
if o.ProjectID == "" { | ||
creds, err := google.FindDefaultCredentials(context.Background(), traceapi.DefaultAuthScopes()...) | ||
if err != nil { | ||
return nil, fmt.Errorf("stackdriver: %v", err) | ||
} | ||
if creds.ProjectID == "" { | ||
return nil, errors.New("stackdriver: no project found with application default credentials") | ||
} | ||
o.ProjectID = creds.ProjectID | ||
} | ||
se, err := newStatsExporter(o) | ||
if err != nil { | ||
return nil, err | ||
} | ||
te, err := newTraceExporter(o) | ||
if err != nil { | ||
return nil, err | ||
} | ||
return &Exporter{ | ||
statsExporter: se, | ||
traceExporter: te, | ||
}, nil | ||
} | ||
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// ExportView exports to the Stackdriver Monitoring if view data | ||
// has one or more rows. | ||
func (e *Exporter) ExportView(vd *view.Data) { | ||
e.statsExporter.ExportView(vd) | ||
} | ||
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// ExportSpan exports a SpanData to Stackdriver Trace. | ||
func (e *Exporter) ExportSpan(sd *trace.SpanData) { | ||
e.traceExporter.ExportSpan(sd) | ||
} | ||
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// Flush waits for exported data to be uploaded. | ||
// | ||
// This is useful if your program is ending and you do not | ||
// want to lose recent stats or spans. | ||
func (e *Exporter) Flush() { | ||
e.statsExporter.Flush() | ||
e.traceExporter.Flush() | ||
} | ||
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func (o Options) handleError(err error) { | ||
if o.OnError != nil { | ||
o.OnError(err) | ||
return | ||
} | ||
log.Printf("Error exporting to Stackdriver: %v", err) | ||
} |
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