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Add emicklei/go-restful instrumentation (#115)
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* Adds a go-restful trace instrumenter via a FilterFunc

A filter may be added at any one of the following:
   * container scope
   * webservice scope
   * route scope

Includes a docker-compose example with instructions.

* Add entry to CHANGELOG.md

* Satisfy go-lint

* Take my own advice and run make precommit

* s/OtelFilter/OTelFilter/

* Add PR# to CHANGELOG

* Standardize line breaks
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evantorrie committed Jul 1, 2020
1 parent 9b5da8f commit a24a7d5
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1 change: 1 addition & 0 deletions CHANGELOG.md
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Expand Up @@ -10,6 +10,7 @@ This project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.htm

### Changed

- Add `emicklei/go-restful/v3` trace instrumentation. (#115)
- Update `CONTRIBUTING.md` to ask for updates to `CHANGELOG.md` with each pull request. (#114)
- Create this `CHANGELOG.md`. (#114)

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48 changes: 48 additions & 0 deletions instrumentation/emicklei/go-restful/config.go
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// Copyright The OpenTelemetry 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 restful

import (
otelpropagation "go.opentelemetry.io/otel/api/propagation"
oteltrace "go.opentelemetry.io/otel/api/trace"
)

// Config is used to configure the go-restful middleware.
type Config struct {
Tracer oteltrace.Tracer
Propagators otelpropagation.Propagators
}

// Option specifies instrumentation configuration options.
type Option func(*Config)

// WithTracer specifies a tracer to use for creating spans. If none is
// specified, a tracer named
// "go.opentelemetry.io/contrib/instrumentation/emicklei/go-restful" from the global
// provider is used.
func WithTracer(tracer oteltrace.Tracer) Option {
return func(cfg *Config) {
cfg.Tracer = tracer
}
}

// WithPropagators specifies propagators to use for extracting
// information from the HTTP requests. If none are specified, global
// ones will be used.
func WithPropagators(propagators otelpropagation.Propagators) Option {
return func(cfg *Config) {
cfg.Propagators = propagators
}
}
21 changes: 21 additions & 0 deletions instrumentation/emicklei/go-restful/doc.go
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// Copyright The OpenTelemetry 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 go-restful provides functions to trace the emicklei/go-restful/v3
// package (https://github.com/emicklei/go-restful).
//
// Instrumentation of an incoming request is achieved via a go-restful
// FilterFunc which may be applied at the container level, at the
// webservice level or at a route level
package restful // import "go.opentelemetry.io/contrib/instrumentation/emicklei/go-restful"
20 changes: 20 additions & 0 deletions instrumentation/emicklei/go-restful/example/Dockerfile
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# Copyright The OpenTelemetry 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.
FROM golang:1.14-alpine AS base
COPY . /src/
WORKDIR /src/instrumentation/emicklei/go-restful

FROM base AS go-restful-server
RUN go install ./example/server.go
CMD ["/go/bin/server"]
28 changes: 28 additions & 0 deletions instrumentation/emicklei/go-restful/example/README.md
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# emicklei/go-restful instrumentation example

An HTTP server using emicklei/go-restful and instrumentation. The server has a
`/users/{id:[0-9]+}` endpoint. The server generates span information to
`stdout`.

These instructions assume you have
[docker-compose](https://docs.docker.com/compose/) installed.

Bring up the `go-restful-server` and `go-restful-client` services to run the
example:

```sh
docker-compose up --detach go-restful-server go-restful-client
```

The `go-restful-client` service sends just one HTTP request to `go-restful-server`
and then exits. View the span generated by `go-restful-server` in the logs:

```sh
docker-compose logs go-restful-server
```

Shut down the services when you are finished with the example:

```sh
docker-compose down
```
39 changes: 39 additions & 0 deletions instrumentation/emicklei/go-restful/example/docker-compose.yml
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# Copyright The OpenTelemetry 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.
version: "3.7"
services:
go-restful-client:
image: golang:1.14-alpine
networks:
- example
command:
- "/bin/sh"
- "-c"
- "wget -O - http://go-restful-server:8080/users/123"
depends_on:
- go-restful-server
go-restful-server:
build:
dockerfile: $PWD/Dockerfile
context: ../../../..
ports:
- "8080:80"
command:
- "/bin/sh"
- "-c"
- "/go/bin/server"
networks:
- example
networks:
example:
96 changes: 96 additions & 0 deletions instrumentation/emicklei/go-restful/example/server.go
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// Copyright The OpenTelemetry 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 main

import (
"log"
"net/http"
"strconv"

"github.com/emicklei/go-restful/v3"

restfultrace "go.opentelemetry.io/contrib/instrumentation/emicklei/go-restful"
otelglobal "go.opentelemetry.io/otel/api/global"
otelkv "go.opentelemetry.io/otel/api/kv"
oteltrace "go.opentelemetry.io/otel/api/trace"
oteltracestdout "go.opentelemetry.io/otel/exporters/trace/stdout"
sdktrace "go.opentelemetry.io/otel/sdk/trace"
)

var tracer oteltrace.Tracer

type UserResource struct{}

func (u UserResource) WebService() *restful.WebService {
ws := &restful.WebService{}

ws.Path("/users").
Consumes(restful.MIME_JSON).
Produces(restful.MIME_JSON)

ws.Route(ws.GET("/{user-id}").To(u.getUser).
Param(ws.PathParameter("user-id", "identifier of the user").DataType("integer").DefaultValue("1")).
Writes(User{}). // on the response
Returns(200, "OK", User{}).
Returns(404, "Not Found", nil))
return ws
}

func main() {
initTracer()
u := UserResource{}
// create the Otel filter
filter := restfultrace.OTelFilter("my-service")
// use it
restful.DefaultContainer.Filter(filter)
restful.DefaultContainer.Add(u.WebService())

_ = http.ListenAndServe(":8080", nil)
}

func initTracer() {
exporter, err := oteltracestdout.NewExporter(oteltracestdout.Options{PrettyPrint: true})
if err != nil {
log.Fatal(err)
}
cfg := sdktrace.Config{
DefaultSampler: sdktrace.AlwaysSample(),
}
tp, err := sdktrace.NewProvider(
sdktrace.WithConfig(cfg),
sdktrace.WithSyncer(exporter),
)
if err != nil {
log.Fatal(err)
}
otelglobal.SetTraceProvider(tp)
tracer = otelglobal.TraceProvider().Tracer("go-restful-server", oteltrace.WithInstrumentationVersion("0.1"))
}

func (u UserResource) getUser(req *restful.Request, resp *restful.Response) {
uid := req.PathParameter("user-id")
_, span := tracer.Start(req.Request.Context(), "getUser", oteltrace.WithAttributes(otelkv.String("id", uid)))
defer span.End()
id, err := strconv.Atoi(uid)
if err == nil && id >= 100 {
_ = resp.WriteEntity(User{id})
return
}
_ = resp.WriteErrorString(http.StatusNotFound, "User could not be found.")
}

type User struct {
ID int `json:"id" description:"identifier of the user"`
}
13 changes: 13 additions & 0 deletions instrumentation/emicklei/go-restful/go.mod
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module go.opentelemetry.io/contrib/instrumentation/emicklei/go-restful

go 1.14

replace go.opentelemetry.io/contrib => ../../..

require (
github.com/emicklei/go-restful/v3 v3.0.0
github.com/json-iterator/go v1.1.10 // indirect
github.com/stretchr/testify v1.6.1
go.opentelemetry.io/contrib v0.7.0
go.opentelemetry.io/otel v0.7.0
)
105 changes: 105 additions & 0 deletions instrumentation/emicklei/go-restful/go.sum
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cloud.google.com/go v0.26.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
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github.com/DataDog/sketches-go v0.0.0-20190923095040-43f19ad77ff7 h1:qELHH0AWCvf98Yf+CNIJx9vOZOfHFDDzgDRYsnNk/vs=
github.com/DataDog/sketches-go v0.0.0-20190923095040-43f19ad77ff7/go.mod h1:Q5DbzQ+3AkgGwymQO7aZFNP7ns2lZKGtvRBzRXfdi60=
github.com/benbjohnson/clock v1.0.3 h1:vkLuvpK4fmtSCuo60+yC63p7y0BmQ8gm5ZXGuBCJyXg=
github.com/benbjohnson/clock v1.0.3/go.mod h1:bGMdMPoPVvcYyt1gHDf4J2KE153Yf9BuiUKYMaxlTDM=
github.com/census-instrumentation/opencensus-proto v0.2.1/go.mod h1:f6KPmirojxKA12rnyqOA5BBL4O983OfeGPqjHWSTneU=
github.com/client9/misspell v0.3.4/go.mod h1:qj6jICC3Q7zFZvVWo7KLAzC3yx5G7kyvSDkc90ppPyw=
github.com/cncf/udpa/go v0.0.0-20191209042840-269d4d468f6f/go.mod h1:M8M6+tZqaGXZJjfX53e64911xZQV5JYwmTeXPW+k8Sc=
github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
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github.com/kr/text v0.1.0/go.mod h1:4Jbv+DJW3UT/LiOwJeYQe1efqtUx/iVham/4vfdArNI=
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golang.org/x/sync v0.0.0-20180314180146-1d60e4601c6f/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
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golang.org/x/sys v0.0.0-20180830151530-49385e6e1522/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
golang.org/x/sys v0.0.0-20190215142949-d0b11bdaac8a/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
golang.org/x/tools v0.0.0-20190114222345-bf090417da8b/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=
golang.org/x/tools v0.0.0-20190226205152-f727befe758c/go.mod h1:9Yl7xja0Znq3iFh3HoIrodX9oNMXvdceNzlUR8zjMvY=
golang.org/x/tools v0.0.0-20190311212946-11955173bddd/go.mod h1:LCzVGOaR6xXOjkQ3onu1FJEFr0SW1gC7cKk1uF8kGRs=
golang.org/x/tools v0.0.0-20190524140312-2c0ae7006135/go.mod h1:RgjU9mgBXZiqYHBnxXauZ1Gv1EHHAz9KjViQ78xBX0Q=
golang.org/x/xerrors v0.0.0-20191204190536-9bdfabe68543 h1:E7g+9GITq07hpfrRu66IVDexMakfv52eLZ2CXBWiKr4=
golang.org/x/xerrors v0.0.0-20191204190536-9bdfabe68543/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
google.golang.org/appengine v1.1.0/go.mod h1:EbEs0AVv82hx2wNQdGPgUI5lhzA/G0D9YwlJXL52JkM=
google.golang.org/appengine v1.4.0/go.mod h1:xpcJRLb0r/rnEns0DIKYYv+WjYCduHsrkT7/EB5XEv4=
google.golang.org/genproto v0.0.0-20180817151627-c66870c02cf8/go.mod h1:JiN7NxoALGmiZfu7CAH4rXhgtRTLTxftemlI0sWmxmc=
google.golang.org/genproto v0.0.0-20190819201941-24fa4b261c55/go.mod h1:DMBHOl98Agz4BDEuKkezgsaosCRResVns1a3J2ZsMNc=
google.golang.org/genproto v0.0.0-20191009194640-548a555dbc03 h1:4HYDjxeNXAOTv3o1N2tjo8UUSlhQgAD52FVkwxnWgM8=
google.golang.org/genproto v0.0.0-20191009194640-548a555dbc03/go.mod h1:n3cpQtvxv34hfy77yVDNjmbRyujviMdxYliBSkLhpCc=
google.golang.org/grpc v1.19.0/go.mod h1:mqu4LbDTu4XGKhr4mRzUsmM4RtVoemTSY81AxZiDr8c=
google.golang.org/grpc v1.23.0/go.mod h1:Y5yQAOtifL1yxbo5wqy6BxZv8vAUGQwXBOALyacEbxg=
google.golang.org/grpc v1.25.1/go.mod h1:c3i+UQWmh7LiEpx4sFZnkU36qjEYZ0imhYfXVyQciAY=
google.golang.org/grpc v1.30.0 h1:M5a8xTlYTxwMn5ZFkwhRabsygDY5G8TYLyQDBxJNAxE=
google.golang.org/grpc v1.30.0/go.mod h1:N36X2cJ7JwdamYAgDz+s+rVMFjt3numwzf/HckM8pak=
google.golang.org/protobuf v0.0.0-20200109180630-ec00e32a8dfd/go.mod h1:DFci5gLYBciE7Vtevhsrf46CRTquxDuWsQurQQe4oz8=
google.golang.org/protobuf v0.0.0-20200221191635-4d8936d0db64/go.mod h1:kwYJMbMJ01Woi6D6+Kah6886xMZcty6N08ah7+eCXa0=
google.golang.org/protobuf v0.0.0-20200228230310-ab0ca4ff8a60/go.mod h1:cfTl7dwQJ+fmap5saPgwCLgHXTUD7jkjRqWcaiX5VyM=
google.golang.org/protobuf v1.20.1-0.20200309200217-e05f789c0967/go.mod h1:A+miEFZTKqfCUM6K7xSMQL9OKL/b6hQv+e19PK+JZNE=
google.golang.org/protobuf v1.21.0/go.mod h1:47Nbq4nVaFHyn7ilMalzfO3qCViNmqZ2kzikPIcrTAo=
google.golang.org/protobuf v1.23.0 h1:4MY060fB1DLGMB/7MBTLnwQUY6+F09GEiz6SsrNqyzM=
google.golang.org/protobuf v1.23.0/go.mod h1:EGpADcykh3NcUnDUJcl1+ZksZNG86OlYog2l/sGQquU=
gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
gopkg.in/check.v1 v1.0.0-20190902080502-41f04d3bba15 h1:YR8cESwS4TdDjEe65xsg0ogRM/Nc3DYOhEAlW+xobZo=
gopkg.in/check.v1 v1.0.0-20190902080502-41f04d3bba15/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c h1:dUUwHk2QECo/6vqA44rthZ8ie2QXMNeKRTHCNY2nXvo=
gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
honnef.co/go/tools v0.0.0-20190102054323-c2f93a96b099/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
honnef.co/go/tools v0.0.0-20190523083050-ea95bdfd59fc/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
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