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Summary: Used addlicense to generate this: addlicense -c "Facebook Inc" -f license_header . example was taken from: https://github.com/facebook/litho/blob/master/lib/soloader/BUCK Reviewed By: alexsn Differential Revision: D17070152 fbshipit-source-id: e7b91398d7f6181727be3400c1872ad5f28e38ed
65 lines
2.1 KiB
Go
65 lines
2.1 KiB
Go
// Copyright 2019-present Facebook Inc. All rights reserved.
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// This source code is licensed under the Apache 2.0 license found
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// in the LICENSE file in the root directory of this source tree.
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package ocgremlin
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import (
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"context"
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"github.com/facebookincubator/ent/dialect/gremlin"
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"go.opencensus.io/trace"
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)
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// Transport is an gremlin.RoundTripper that instruments all outgoing requests with
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// OpenCensus stats and tracing.
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type Transport struct {
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// Base is a wrapped gremlin.RoundTripper that does the actual requests.
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Base gremlin.RoundTripper
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// StartOptions are applied to the span started by this Transport around each
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// request.
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//
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// StartOptions.SpanKind will always be set to trace.SpanKindClient
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// for spans started by this transport.
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StartOptions trace.StartOptions
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// GetStartOptions allows to set start options per request. If set,
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// StartOptions is going to be ignored.
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GetStartOptions func(context.Context, *gremlin.Request) trace.StartOptions
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// NameFromRequest holds the function to use for generating the span name
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// from the information found in the outgoing Gremlin Request. By default the
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// name equals the URL Path.
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FormatSpanName func(context.Context, *gremlin.Request) string
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// WithQuery, if set to true, will enable recording of gremlin queries in spans.
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// Only allow this if it is safe to have queries recorded with respect to
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// security.
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WithQuery bool
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}
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// RoundTrip implements gremlin.RoundTripper, delegating to Base and recording stats and traces for the request.
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func (t *Transport) RoundTrip(ctx context.Context, req *gremlin.Request) (*gremlin.Response, error) {
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spanNameFormatter := t.FormatSpanName
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if spanNameFormatter == nil {
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spanNameFormatter = func(context.Context, *gremlin.Request) string {
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return "gremlin:traversal"
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}
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}
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startOpts := t.StartOptions
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if t.GetStartOptions != nil {
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startOpts = t.GetStartOptions(ctx, req)
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}
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var rt gremlin.RoundTripper = &traceTransport{
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base: t.Base,
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formatSpanName: spanNameFormatter,
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startOptions: startOpts,
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withQuery: t.WithQuery,
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}
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rt = statsTransport{rt}
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return rt.RoundTrip(ctx, req)
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}
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