102 lines
2.2 KiB
Go
102 lines
2.2 KiB
Go
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// Copyright © 2016 Abcum Ltd
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package web
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import (
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"context"
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"github.com/abcum/fibre"
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"github.com/abcum/surreal/cnf"
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"cloud.google.com/go/compute/metadata"
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"cloud.google.com/go/trace"
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"google.golang.org/api/option"
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)
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var client *trace.Client
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// tracer returns a middleware function for stackdriver trace monitoring.
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func tracer() fibre.MiddlewareFunc {
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var e error
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var s trace.SamplingPolicy
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var p string = cnf.Settings.Logging.Google.Project
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var c string = cnf.Settings.Logging.Google.Credentials
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// If no project id has been set
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// then attempt to pull this from
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// machine metadata if on GCE.
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if p == "" {
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if p, e = metadata.ProjectID(); e != nil {
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return fibre.MiddlewareSkip
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}
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}
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// Connect to Stackdriver using a
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// credentials file if one has been
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// specified, or metadata if not.
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switch c {
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case "":
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client, e = trace.NewClient(
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context.Background(),
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p,
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)
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default:
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client, e = trace.NewClient(
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context.Background(),
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p,
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option.WithServiceAccountFile(c),
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)
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}
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if e != nil {
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return fibre.MiddlewareSkip
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}
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// Attempt to setup the Stackdriver
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// client policy so that a fraction
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// of requests are sent to google.
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if s, e = trace.NewLimitedSampler(1, 5); e != nil {
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return fibre.MiddlewareSkip
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}
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client.SetSamplingPolicy(s)
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return func(h fibre.HandlerFunc) fibre.HandlerFunc {
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return func(c *fibre.Context) error {
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if c.Request().Header().Get("Upgrade") == "websocket" {
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return h(c)
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}
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span := client.SpanFromRequest(c.Request().Request)
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span.SetLabel("http/id", c.Get("id").(string))
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ctx := trace.NewContext(c.Context(), span)
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c = c.WithContext(ctx)
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defer span.Finish()
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return h(c)
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}
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}
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}
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