Adds post sample for go

README.md

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+# zipkin-api-example
+This repository shows you how to use the OpenApi/Swagger definition of
+the zipkin-server http api.
+
+Here's a list of examples:
+
+* [go](go/README.md) - Shows how to generate a client and upload a sample trace.

go/README.md

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+## Swagger
+
+The examples in this directory assume that the zipkin API client has been generated using
+[go-swagger](https://github.com/go-swagger/go-swagger) into the `client` directory.
+
+```bash
+# once you've installed swagger, build the client
+$ wget https://raw.githubusercontent.com/openzipkin/zipkin-api/master/zipkin2-api.yaml
+$ swagger generate client -f zipkin2-api.yaml -A zipkin
+# now, you can run one of the examples, such as POSTing a test span
+$ DEBUG=1 go run post_sample_trace.go
+```

go/post_sample_trace.go

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+package main
+
+import (
+	"fmt"
+	"log"
+	"math/rand"
+	"strconv"
+	"time"
+
+	httptransport "github.com/go-openapi/runtime/client"
+	"github.com/go-openapi/strfmt"
+	"github.com/openzipkin/zipkin-api-example/go/client"
+	"github.com/openzipkin/zipkin-api-example/go/client/operations"
+	"github.com/openzipkin/zipkin-api-example/go/models"
+)
+
+func main() {
+	transport := httptransport.New("localhost:9411", "/api/v2", []string{"http"})
+	zipkin := client.New(transport, strfmt.Default)
+
+	id := uint64(rand.New(rand.NewSource(time.Now().UnixNano())).Int63())
+	spanID := strconv.FormatUint(id, 16)
+	timestamp := int64(time.Now().UnixNano() / int64(time.Microsecond))
+	span := &models.Span{
+		TraceID:   spanID,
+		ID:        spanID,
+		Kind:      models.SpanKindSERVER,
+		Name:      "test",
+		Timestamp: timestamp,
+		Duration:  int64(200000),
+		LocalEndpoint: &models.Endpoint{
+			ServiceName: "testService",
+			IPV4:        "192.228.233.62",
+			Port:        80,
+		},
+		RemoteEndpoint: &models.Endpoint{
+			IPV4: "192.228.233.62",
+		},
+		Tags: map[string]string{
+			"http.path": "/api",
+		},
+	}
+
+	resp, err := zipkin.Operations.PostSpans(
+		operations.NewPostSpansParams().WithSpans(models.ListOfSpans{span}),
+	)
+
+	if err != nil {
+		log.Fatal(err)
+	}
+	fmt.Println(string(resp.Error()))
+}