add logtest command

.gitignore

@@ -1,5 +1,5 @@
-# ---> Go
 # Binaries for programs and plugins
+bin
 *.exe
 *.exe~
 *.dll
@@ -12,3 +12,4 @@
 # Output of the go coverage tool, specifically when used with LiteIDE
 *.out
 
+/.env

Makefile

@@ -0,0 +1,17 @@
+BIN_NAME=gotest
+PACKAGE_NAME=git.bloy.org/mike/gotest
+GIT_DESCRIBE=$(shell git describe --always --long --dirty)
+LDFLAGS="-X ${PACKAGE_NAME}/version.gitDescribe=${GIT_DESCRIBE}"
+
+default: all
+
+all: test build
+
+build:
+	go build -ldflags ${LDFLAGS} -o bin/${BIN_NAME}
+
+test:
+	go test ./... -ldflags ${LDFLAGS}
+
+clean:
+	rm -rf bin/${BIN_NAME}

cmd/logtest.go

@@ -0,0 +1,23 @@
+package cmd
+
+import (
+	log "github.com/sirupsen/logrus"
+	"github.com/spf13/cobra"
+)
+
+func init() {
+	rootCmd.AddCommand(logtestCmd)
+}
+
+var logtestCmd = &cobra.Command{
+	Use:   "logtest",
+	Short: "Test logging",
+	Long:  "Test logging",
+	Run: func(cmd *cobra.Command, args []string) {
+		log.WithField("msg-id", 11987).Trace("This is a trace")
+		log.WithField("bob", "your uncle").Debug("This is debug")
+		log.WithField("userid", "mike").Info("This is an info")
+		log.WithField("jenny", 8675309).Warn("This is a warning")
+		log.WithField("OMG", "Ponies").Error("This is an error")
+	},
+}

cmd/root.go

@@ -0,0 +1,62 @@
+package cmd
+
+import (
+	"fmt"
+	"os"
+
+	"github.com/kyoh86/xdg"
+	log "github.com/sirupsen/logrus"
+	"github.com/spf13/cobra"
+	"github.com/spf13/viper"
+)
+
+var cfgFile string
+
+var rootCmd = &cobra.Command{
+	Use:   "gotest",
+	Short: "Gotest is a thing for testing out go packaging and boilerplate",
+	Long:  "An Experiment",
+}
+
+func init() {
+	cobra.OnInitialize(initConfig)
+	viper.SetDefault("addr", ":8000")
+	viper.SetDefault("env", "production")
+	rootCmd.PersistentFlags().StringVarP(&cfgFile, "config", "c",
+		"", "Full path to config file")
+}
+
+func initConfig() {
+	viper.SetEnvPrefix("gotest")
+	viper.AutomaticEnv()
+	if cfgFile != "" {
+		viper.SetConfigFile(cfgFile)
+	} else {
+		for _, p := range xdg.AllConfigDirs() {
+			viper.AddConfigPath(p)
+		}
+		viper.SetConfigName("gotest")
+	}
+	viper.ReadInConfig()
+	if viper.GetString("env") == "production" {
+		log.SetFormatter(&log.JSONFormatter{})
+		log.SetOutput(os.Stdout)
+	} else {
+		log.SetFormatter(&log.JSONFormatter{
+			PrettyPrint: true,
+			FieldMap: log.FieldMap{
+				log.FieldKeyLevel: "priority",
+				log.FieldKeyTime:  "timestamp",
+				log.FieldKeyMsg:   "message",
+			},
+			DataKey: "opt"})
+	}
+}
+
+// Execute the root command
+func Execute() {
+	if err := rootCmd.Execute(); err != nil {
+		fmt.Println(err)
+		os.Exit(1)
+	}
+}

cmd/run.go

@@ -0,0 +1,20 @@
+package cmd
+
+import (
+	"git.bloy.org/mike/gotest/web"
+	"github.com/spf13/cobra"
+)
+
+func init() {
+	rootCmd.AddCommand(runCmd)
+	runCmd.Flags().String("addr", ":8000", "Port to serve http")
+}
+
+var runCmd = &cobra.Command{
+	Use:   "run",
+	Short: "Run the webserver",
+	Long:  "Listen to the specified port and serve http until interrupted",
+	Run: func(cmd *cobra.Command, args []string) {
+		web.RunServer()
+	},
+}

cmd/version.go

@@ -0,0 +1,33 @@
+package cmd
+
+import (
+	"fmt"
+
+	"git.bloy.org/mike/gotest/version"
+	"github.com/spf13/cobra"
+	"github.com/spf13/viper"
+)
+
+var showCfg bool
+
+func init() {
+	rootCmd.AddCommand(versionCmd)
+	versionCmd.Flags().BoolVarP(&showCfg, "long", "l", false,
+		"Show the configuration as well as the version")
+}
+
+var versionCmd = &cobra.Command{
+	Use:   "version",
+	Short: "Print the version number",
+	Long:  "All software has versions. This is how you see it.",
+	Run: func(cmd *cobra.Command, args []string) {
+		fmt.Printf("This is GoTest %s\n\n", version.Version)
+		fmt.Printf("  Config location: %s\n", viper.ConfigFileUsed())
+		if showCfg {
+			fmt.Println("\nConfiguration Data:")
+			for _, key := range viper.AllKeys() {
+				fmt.Printf("    %s: %t\n", key, viper.Get(key))
+			}
+		}
+	},
+}

go.mod

@@ -0,0 +1,13 @@
+module git.bloy.org/mike/gotest
+
+go 1.12
+
+require (
+	github.com/google/uuid v1.1.1
+	github.com/gorilla/mux v1.7.3
+	github.com/joho/godotenv v1.3.0
+	github.com/kyoh86/xdg v1.0.0
+	github.com/sirupsen/logrus v1.4.2
+	github.com/spf13/cobra v0.0.5
+	github.com/spf13/viper v1.3.2
+)

go.sum

@@ -0,0 +1,61 @@
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main.go

@@ -0,0 +1,10 @@
+package main
+
+import (
+	"git.bloy.org/mike/gotest/cmd"
+	_ "github.com/joho/godotenv/autoload"
+)
+
+func main() {
+	cmd.Execute()
+}

version/version.go

@@ -0,0 +1,119 @@
+// Package version implements version parsing logic
+package version
+
+import (
+	"fmt"
+	"regexp"
+	"runtime"
+	"strconv"
+	"strings"
+)
+
+// gitDescribe : Git's "git describe --always --dirty" output
+var gitDescribe = ""
+
+// GoVersion : The go version used to compile this binary
+var GoVersion = runtime.Version()
+
+// OsArch : The OS and archetcture used for this binary
+var OsArch = fmt.Sprintf("%s (%s)", runtime.GOOS, runtime.GOARCH)
+
+// Version : the complete version data
+var Version = parseGitDescribe(gitDescribe)
+
+// Info : data structure for program version information
+type info struct {
+	Major      int
+	Minor      int
+	Patch      int
+	Prerelease []string
+	BuildMeta  []string
+}
+
+// Equal compares two Info structs for equality
+func (i info) Equal(o info) bool {
+	if i.Major != o.Major || i.Minor != o.Minor || i.Patch != o.Patch {
+		return false
+	}
+	if len(i.Prerelease) != len(o.Prerelease) || len(i.BuildMeta) != len(o.BuildMeta) {
+		return false
+	}
+	for j := 0; j < len(i.Prerelease); j++ {
+		if i.Prerelease[j] != o.Prerelease[j] {
+			return false
+		}
+	}
+	for j := 0; j < len(i.BuildMeta); j++ {
+		if i.BuildMeta[j] != o.BuildMeta[j] {
+			return false
+		}
+	}
+	return true
+}
+
+// String returns a human friendly version string
+func (i info) String() string {
+	var b strings.Builder
+	fmt.Fprintf(&b, "v%d.%d.%d", i.Major, i.Minor, i.Patch)
+	if len(i.Prerelease) > 0 {
+		fmt.Fprintf(&b, "-%s", strings.Join(i.Prerelease, "."))
+	}
+	if len(i.BuildMeta) > 0 {
+		fmt.Fprintf(&b, "+%s", strings.Join(i.BuildMeta, "."))
+	}
+	return b.String()
+}
+
+/* reStr is a regular expression string to parse the output of git describe
+Match groups:
+
+1. version number (without "v")
+2. major version
+3. minor version
+4. patch version
+5. prerelease identifier
+6. commit count
+7. git short hash
+8. "-dirty" if dirty, else ""
+*/
+const reStr = `^(?:v(([0-9]+)(?:\.([0-9]+)(?:\.([0-9]+))?)?))?(?:-((?:alpha|beta|rc|dev)(?:\.[a-zA-Z0-9]+)*))?(?:-([0-9]+)-g)?([a-f0-9A-F]+)?(?:(-dirty))?$`
+
+var re = regexp.MustCompile(reStr)
+
+func parseGitDescribe(input string) info {
+	matches := re.FindStringSubmatch(input)
+	if matches == nil || matches[0] == "" {
+		return info{0, 0, 0, []string{"dev"}, []string{"unknown"}}
+	}
+
+	info := info{}
+	if matches[2] != "" {
+		num, _ := strconv.Atoi(matches[2])
+		info.Major = num
+	}
+	if matches[3] != "" {
+		num, _ := strconv.Atoi(matches[3])
+		info.Minor = num
+	}
+	if matches[4] != "" {
+		num, _ := strconv.Atoi(matches[4])
+		info.Patch = num
+	}
+	if matches[5] != "" {
+		info.Prerelease = strings.Split(matches[5], ".")
+	}
+	if matches[6] != "" || matches[7] != "" || matches[8] != "" {
+		info.BuildMeta = append(info.BuildMeta, "git")
+		if matches[6] != "" {
+			info.BuildMeta = append(info.BuildMeta, matches[6])
+		}
+		if matches[7] != "" {
+			info.BuildMeta = append(info.BuildMeta, matches[7])
+		}
+		if matches[8] != "" {
+			info.BuildMeta = append(info.BuildMeta, "dirty")
+		}
+	}
+
+	return info
+}

version/version_test.go

@@ -0,0 +1,77 @@
+package version
+
+import (
+	"fmt"
+	"runtime"
+	"testing"
+)
+
+func TestGoVersion(t *testing.T) {
+	got := GoVersion
+	expected := runtime.Version()
+	if got != expected {
+		t.Errorf("Expected: %s ; Got: %s", got, expected)
+	}
+}
+
+func TestOsArch(t *testing.T) {
+	got := OsArch
+	expected := runtime.GOOS + " (" + runtime.GOARCH + ")"
+	if got != expected {
+		t.Errorf("Expected: %s ; Got: %s", got, expected)
+	}
+}
+
+func TestParseGitDescribe(t *testing.T) {
+	expected := []info{
+		info{0, 0, 0, []string{"dev"}, []string{"unknown"}},
+		info{0, 0, 0, []string{}, []string{"git", "feedbeef"}},
+		info{1, 2, 0, []string{"dev", "1"}, []string{"git", "83", "feedbeef"}},
+		info{1, 2, 3, []string{"dev", "1"}, []string{"git", "83", "feedbeef", "dirty"}},
+		info{1, 2, 3, []string{}, []string{"git", "dirty"}},
+		info{1, 2, 3, []string{"beta"}, []string{"git", "dirty"}},
+		info{1, 2, 3, []string{"rc"}, []string{}},
+	}
+	inputs := []string{
+		"",
+		"feedbeef",
+		"v1.2-dev.1-83-gfeedbeef",
+		"v1.2.3-dev.1-83-gfeedbeef-dirty",
+		"v1.2.3-dirty",
+		"v1.2.3-beta-dirty",
+		"v1.2.3-rc",
+	}
+	for i := 0; i < len(expected); i++ {
+		got := parseGitDescribe(inputs[i])
+		if !expected[i].Equal(got) {
+			t.Errorf("Got: %v, Expected: %v", got, expected[i])
+		}
+	}
+}
+
+func TestInfoStringer(t *testing.T) {
+	inputs := []info{
+		info{0, 0, 0, []string{"dev"}, []string{"unknown"}},
+		info{0, 0, 0, []string{}, []string{"git", "feedbeef"}},
+		info{1, 2, 0, []string{"dev", "1"}, []string{"git", "83", "feedbeef"}},
+		info{1, 2, 3, []string{"dev", "1"}, []string{"git", "83", "feedbeef", "dirty"}},
+		info{1, 2, 3, []string{}, []string{"git", "dirty"}},
+		info{1, 2, 3, []string{"beta"}, []string{"git", "dirty"}},
+		info{1, 2, 3, []string{"rc"}, []string{}},
+	}
+	expected := []string{
+		"v0.0.0-dev+unknown",
+		"v0.0.0+git.feedbeef",
+		"v1.2.0-dev.1+git.83.feedbeef",
+		"v1.2.3-dev.1+git.83.feedbeef.dirty",
+		"v1.2.3+git.dirty",
+		"v1.2.3-beta+git.dirty",
+		"v1.2.3-rc",
+	}
+	for i := 0; i < len(expected); i++ {
+		got := fmt.Sprint(inputs[i])
+		if got != expected[i] {
+			t.Errorf("Got: %v, Expected: %v", got, expected[i])
+		}
+	}
+}

web/middleware.go

@@ -0,0 +1,150 @@
+package web
+
+import (
+	"context"
+	"net/http"
+	"time"
+
+	"github.com/google/uuid"
+	"github.com/gorilla/mux"
+	log "github.com/sirupsen/logrus"
+)
+
+type contextKey int
+
+// context keys to be used when inspecting request contexts
+const (
+	requestIDKey contextKey = iota
+	correlationIDKey
+	loggerKey
+)
+
+// Header names for middleware to use
+const (
+	RequestIDHeader     string = "X-Request-Id"
+	CorrelationIDHeader        = "X-Correlation-Id"
+)
+
+// CorrelationIDFromRequest gets a correlation id from the request, if it
+// exists.
+func CorrelationIDFromRequest(req *http.Request) string {
+	var id string
+	if str := req.Header.Get(CorrelationIDHeader); str != "" {
+		id = str
+	}
+	return id
+}
+
+func getFromContext(ctx context.Context, key contextKey) (value string, ok bool) {
+	if v := ctx.Value(key); v != nil {
+		value = v.(string)
+		ok = true
+		return
+	}
+	value, ok = "", false
+	return
+}
+
+func CorrelationIDFromContext(ctx context.Context) (value string, ok bool) {
+	return getFromContext(ctx, correlationIDKey)
+}
+
+func RequestIDFromContext(ctx context.Context) (value string, ok bool) {
+	return getFromContext(ctx, requestIDKey)
+}
+
+func LoggerFromContext(ctx context.Context) *log.Entry {
+	if v := ctx.Value(loggerKey); v != nil {
+		return v.(*log.Entry)
+	}
+	return log.WithFields(log.Fields{})
+}
+
+type loggingResponseWriter struct {
+	http.ResponseWriter
+	size, status int
+	start        time.Time
+}
+
+// This idea is taken from the violetear responsewriter
+// https://github.com/nbari/violetear/blob/master/responsewriter.go
+func newLoggingResponseWriter(w http.ResponseWriter) *loggingResponseWriter {
+	return &loggingResponseWriter{
+		ResponseWriter: w,
+		start:          time.Now(),
+		status:         http.StatusOK,
+	}
+}
+
+func (w *loggingResponseWriter) Status() int {
+	return w.status
+}
+
+func (w *loggingResponseWriter) Size() int {
+	return w.size
+}
+
+func (w *loggingResponseWriter) ElapsedTime() string {
+	return time.Since(w.start).String()
+}
+
+func (w *loggingResponseWriter) Write(data []byte) (int, error) {
+	size, err := w.ResponseWriter.Write(data)
+	w.size += size
+	return size, err
+}
+
+func (w *loggingResponseWriter) WriteHeader(statusCode int) {
+	w.status = statusCode
+	w.ResponseWriter.WriteHeader(statusCode)
+}
+
+func middleware(r *mux.Router) *mux.Router {
+	r.Use(loggingMw)
+	r.Use(discworldMw)
+	log.Info("using")
+	return r
+}
+
+func discworldMw(next http.Handler) http.Handler {
+	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		w.Header().Set("X-Clacks-Overhead", "GNU Terry Pratchett")
+		next.ServeHTTP(w, r)
+	})
+}
+
+func loggingMw(next http.Handler) http.Handler {
+	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		newW := newLoggingResponseWriter(w)
+		correlationID := CorrelationIDFromRequest(r)
+		if correlationID == "" {
+			correlationID = uuid.New().String()
+		}
+		requestID := uuid.New().String()
+		contextLogger := log.WithFields(log.Fields{
+			"requestID":     requestID,
+			"correlationID": correlationID,
+		})
+		ctx := r.Context()
+		ctx = context.WithValue(ctx, requestIDKey, requestID)
+		ctx = context.WithValue(ctx, correlationIDKey, correlationID)
+		ctx = context.WithValue(ctx, loggerKey, contextLogger)
+		r = r.WithContext(ctx)
+		w.Header().Set(CorrelationIDHeader, correlationID)
+		w.Header().Set(RequestIDHeader, requestID)
+		requestLogger := contextLogger.WithFields(
+			log.Fields{
+				"path":         r.URL.Path,
+				"query_string": r.URL.RawQuery,
+				"method":       r.Method,
+			})
+		requestLogger.Info("Start web request")
+		next.ServeHTTP(newW, r)
+		requestLogger.WithFields(
+			log.Fields{
+				"status":   newW.Status(),
+				"size":     newW.Size(),
+				"duration": newW.ElapsedTime()}).
+			Info("End web request")
+	})
+}

web/router.go

@@ -0,0 +1,35 @@
+package web
+
+import (
+	"fmt"
+	"net/http"
+
+	"github.com/gorilla/mux"
+	log "github.com/sirupsen/logrus"
+	"github.com/spf13/viper"
+)
+
+func router() *mux.Router {
+	r := mux.NewRouter()
+	r.HandleFunc("/", root)
+	return r
+}
+
+func root(resp http.ResponseWriter, req *http.Request) {
+	logger := LoggerFromContext(req.Context())
+	if req.URL.Path != "/" {
+		http.NotFound(resp, req)
+		logger.Warning("404 Not found")
+		return
+	}
+	fmt.Fprintf(resp, "Hello World!")
+	logger.Info("root page")
+}
+
+// RunServer runs the webserver with the router and middleware
+func RunServer() {
+	router := middleware(router())
+	addr := viper.GetString("addr")
+	log.WithFields(log.Fields{"addr": addr}).Info("Webserver starting")
+	log.Fatal(http.ListenAndServe(viper.GetString("addr"), router))
+}