Added Jaeger instrumentation. (#8)

* Added Jaeger instrumentation.

client/http.go

@@ -2,24 +2,29 @@ package client
 
 import (
 	"fmt"
+	"log"
 	"net/http"
 
+	hckit "github.com/hashicorp-demoapp/go-hckit"
 	"github.com/hashicorp-demoapp/product-api-go/data/model"
 )
 
 // HTTP contains all client details
 type HTTP struct {
+	client  *http.Client
 	baseURL string
 }
 
 // NewHTTP creates a new HTTP client
 func NewHTTP(baseURL string) *HTTP {
-	return &HTTP{baseURL}
+	c := &http.Client{Transport: hckit.TracingRoundTripper{Proxied: http.DefaultTransport}}
+	return &HTTP{c, baseURL}
 }
 
 // GetCoffees retrieves a list of coffees
 func (h *HTTP) GetCoffees() ([]model.Coffee, error) {
-	resp, err := http.Get(fmt.Sprintf("%s/coffees", h.baseURL))
+	log.Print("INFO: Executing GetCoffees")
+	resp, err := h.client.Get(fmt.Sprintf("%s/coffees", h.baseURL))
 	if err != nil {
 		return nil, err
 	}
@@ -35,7 +40,7 @@ func (h *HTTP) GetCoffees() ([]model.Coffee, error) {
 
 // GetCoffee retrieves a single coffee
 func (h *HTTP) GetCoffee(coffeeID int) (*model.Coffee, error) {
-	resp, err := http.Get(fmt.Sprintf("%s/coffees/%d", h.baseURL, coffeeID))
+	resp, err := h.client.Get(fmt.Sprintf("%s/coffees/%d", h.baseURL, coffeeID))
 	if err != nil {
 		return nil, err
 	}
@@ -51,7 +56,7 @@ func (h *HTTP) GetCoffee(coffeeID int) (*model.Coffee, error) {
 
 // GetIngredientsForCoffee retrieves a list of ingredients that go into a particular coffee
 func (h *HTTP) GetIngredientsForCoffee(coffeeID int) ([]model.Ingredient, error) {
-	resp, err := http.Get(fmt.Sprintf("%s/coffees/%d/ingredients", h.baseURL, coffeeID))
+	resp, err := h.client.Get(fmt.Sprintf("%s/coffees/%d/ingredients", h.baseURL, coffeeID))
 	if err != nil {
 		return nil, err
 	}

go.mod

@@ -3,20 +3,22 @@ module github.com/hashicorp-demoapp/product-api-go
 go 1.13
 
 require (
-	github.com/cucumber/gherkin-go/v11 v11.0.0
+	github.com/codahale/hdrhistogram v0.9.0 // indirect
 	github.com/cucumber/godog v0.9.0
 	github.com/cucumber/messages-go/v10 v10.0.3
-	github.com/cucumber/messages-go/v11 v11.1.1
-	github.com/cucumber/messages-go/v12 v12.1.1
 	github.com/dgrijalva/jwt-go v3.2.0+incompatible
 	github.com/fsnotify/fsnotify v1.4.7
+	github.com/go-sql-driver/mysql v1.4.1 // indirect
 	github.com/gorilla/mux v1.7.3
+	github.com/hashicorp-demoapp/go-hckit v0.0.1
 	github.com/hashicorp/go-hclog v0.10.0
-	github.com/jinzhu/gorm v1.9.11 // indirect
 	github.com/jmoiron/sqlx v1.2.0
 	github.com/lib/pq v1.2.0
+	github.com/mattn/go-sqlite3 v1.11.0 // indirect
 	github.com/nicholasjackson/env v0.5.0
 	github.com/stretchr/testify v1.5.1
+	github.com/uber/jaeger-client-go v2.25.0+incompatible // indirect
+	github.com/uber/jaeger-lib v2.2.0+incompatible // indirect
 	go.opentelemetry.io/otel v0.2.0
 	go.opentelemetry.io/otel/exporter/metric/prometheus v0.2.0
 	golang.org/x/sys v0.0.0-20191210023423-ac6580df4449 // indirect