Added the ability to enable debug logging.

README.md

@@ -8,6 +8,9 @@ Available on GitHub at https://github.com/halverneus/static-file-server
 Environment variables with defaults:
 
 ```bash
+# Enable debugging for troubleshooting. If set to 'true' this prints extra
+# information during execution. Default value is 'false'.
+DEBUG=false
 # Optional Hostname for binding. Leave black to accept any incoming HTTP request
 # on the prescribed port.
 HOST=
@@ -34,6 +37,7 @@ configuration file with defaults. Pass in the path to the configuration file
 using the command line option ('-c', '-config', '--config').
 
 ```yaml
+debug: false
 host: ""
 port: 8080
 show-listing: true

cli/help/help.go

@@ -33,6 +33,10 @@ DEPENDENCIES
     None... not even libc!
 
 ENVIRONMENT VARIABLES
+    DEBUG
+        When set to 'true' enables additional logging, including the
+        configuration used and an access log for each request. Default value is
+        'false'.
     FOLDER
         The path to the folder containing the contents to be served over
         HTTP(s). If not supplied, defaults to '/web' (for Docker reasons).
@@ -69,6 +73,7 @@ CONFIGURATION FILE
 
     Example config.yml with defaults:
     ----------------------------------------------------------------------------
+    debug: false
     folder: /web
     host: ""
     port: 8080

cli/server/server.go

@@ -16,6 +16,9 @@ var (
 
 // Run server.
 func Run() error {
+	if config.Get.Debug {
+		config.Log()
+	}
 	// Choose and set the appropriate, optimized static file serving function.
 	handler := selectHandler()
 
@@ -30,11 +33,21 @@ func Run() error {
 // handlerSelector returns the appropriate request handler based on
 // configuration.
 func handlerSelector() (handler http.HandlerFunc) {
+	var serveFileHandler handle.FileServerFunc
+	serveFileHandler = http.ServeFile
+	if config.Get.Debug {
+		serveFileHandler = handle.WithLogging(serveFileHandler)
+	}
+
 	// Choose and set the appropriate, optimized static file serving function.
 	if 0 == len(config.Get.URLPrefix) {
-		handler = handle.Basic(config.Get.Folder)
+		handler = handle.Basic(serveFileHandler, config.Get.Folder)
 	} else {
-		handler = handle.Prefix(config.Get.Folder, config.Get.URLPrefix)
+		handler = handle.Prefix(
+			serveFileHandler,
+			config.Get.Folder,
+			config.Get.URLPrefix,
+		)
 	}
 
 	// Determine whether index files should hidden.

cli/server/server_test.go

@@ -17,8 +17,14 @@ func TestRun(t *testing.T) {
 		}
 	}
 
+	config.Get.Debug = false
 	if err := Run(); listenerError != err {
-		t.Errorf("Expected %v but got %v", listenerError, err)
+		t.Errorf("Without debug expected %v but got %v", listenerError, err)
+	}
+
+	config.Get.Debug = true
+	if err := Run(); listenerError != err {
+		t.Errorf("With debug expected %v but got %v", listenerError, err)
 	}
 }
 
@@ -32,18 +38,24 @@ func TestHandlerSelector(t *testing.T) {
 		folder  string
 		prefix  string
 		listing bool
+		debug   bool
 	}{
-		{"Basic handler", testFolder, "", true},
-		{"Prefix handler", testFolder, testPrefix, true},
-		{"Basic and hide listing handler", testFolder, "", false},
-		{"Prefix and hide listing handler", testFolder, testPrefix, false},
+		{"Basic handler w/o debug", testFolder, "", true, false},
+		{"Prefix handler w/o debug", testFolder, testPrefix, true, false},
+		{"Basic and hide listing handler w/o debug", testFolder, "", false, false},
+		{"Prefix and hide listing handler w/o debug", testFolder, testPrefix, false, false},
+		{"Basic handler w/debug", testFolder, "", true, true},
+		{"Prefix handler w/debug", testFolder, testPrefix, true, true},
+		{"Basic and hide listing handler w/debug", testFolder, "", false, true},
+		{"Prefix and hide listing handler w/debug", testFolder, testPrefix, false, true},
 	}
 
 	for _, tc := range testCases {
 		t.Run(tc.name, func(t *testing.T) {
+			config.Get.Debug = tc.debug
 			config.Get.Folder = tc.folder
-			config.Get.URLPrefix = tc.prefix
 			config.Get.ShowListing = tc.listing
+			config.Get.URLPrefix = tc.prefix
 
 			handlerSelector()
 		})

cli/version/version.go

@@ -16,10 +16,10 @@ var (
 	MajorVersion = 1
 
 	// MinorVersion of static-file-server.
-	MinorVersion = 3
+	MinorVersion = 4
 
 	// FixVersion of static-file-server.
-	FixVersion = 3
+	FixVersion = 0
 
 	// Text for directly accessing the static-file-server version.
 	Text = fmt.Sprintf(

config/config.go

@@ -14,6 +14,7 @@ import (
 var (
 	// Get the desired configuration value.
 	Get struct {
+		Debug       bool   `yaml:"debug"`
 		Folder      string `yaml:"folder"`
 		Host        string `yaml:"host"`
 		Port        uint16 `yaml:"port"`
@@ -25,6 +26,7 @@ var (
 )
 
 const (
+	debugKey       = "DEBUG"
 	folderKey      = "FOLDER"
 	hostKey        = "HOST"
 	portKey        = "PORT"
@@ -35,6 +37,7 @@ const (
 )
 
 const (
+	defaultDebug       = false
 	defaultFolder      = "/web"
 	defaultHost        = ""
 	defaultPort        = uint16(8080)
@@ -50,6 +53,7 @@ func init() {
 }
 
 func setDefaults() {
+	Get.Debug = defaultDebug
 	Get.Folder = defaultFolder
 	Get.Host = defaultHost
 	Get.Port = defaultPort
@@ -82,9 +86,21 @@ func Load(filename string) (err error) {
 	return validate()
 }
 
+// Log the current configuration.
+func Log() {
+	// YAML marshalling should never error, but if it could, the result is that
+	// the contents of the configuration are not logged.
+	contents, _ := yaml.Marshal(&Get)
+
+	// Log the configuration.
+	fmt.Println("Using the following configuration:")
+	fmt.Println(string(contents))
+}
+
 // overrideWithEnvVars the default values and the configuration file values.
 func overrideWithEnvVars() {
 	// Assign envvars, if set.
+	Get.Debug = envAsBool(debugKey, Get.Debug)
 	Get.Folder = envAsStr(folderKey, Get.Folder)
 	Get.Host = envAsStr(hostKey, Get.Host)
 	Get.Port = envAsUint16(portKey, Get.Port)

config/config_test.go

@@ -6,6 +6,8 @@ import (
 	"os"
 	"strconv"
 	"testing"
+
+	"gopkg.in/yaml.v2"
 )
 
 func TestLoad(t *testing.T) {
@@ -65,8 +67,17 @@ func TestLoad(t *testing.T) {
 	}(t)
 }
 
+func TestLog(t *testing.T) {
+	// Test whether YAML marshalling works, as that is the only error case.
+	if _, err := yaml.Marshal(&Get); nil != err {
+		t.Errorf("While testing YAML marshalling for config Log() got %v", err)
+	}
+	Log()
+}
+
 func TestOverrideWithEnvvars(t *testing.T) {
 	// Choose values that are different than defaults.
+	testDebug := true
 	testFolder := "/my/directory"
 	testHost := "apets.life"
 	testPort := uint16(666)
@@ -76,6 +87,7 @@ func TestOverrideWithEnvvars(t *testing.T) {
 	testURLPrefix := "/url/prefix"
 
 	// Set all environment variables with test values.
+	os.Setenv(debugKey, fmt.Sprintf("%t", testDebug))
 	os.Setenv(folderKey, testFolder)
 	os.Setenv(hostKey, testHost)
 	os.Setenv(portKey, strconv.Itoa(int(testPort)))
@@ -113,6 +125,7 @@ func TestOverrideWithEnvvars(t *testing.T) {
 	// Verify defaults.
 	setDefaults()
 	phase := "defaults"
+	equalBool(t, phase, debugKey, defaultDebug, Get.Debug)
 	equalStrings(t, phase, folderKey, defaultFolder, Get.Folder)
 	equalStrings(t, phase, hostKey, defaultHost, Get.Host)
 	equalUint16(t, phase, portKey, defaultPort, Get.Port)
@@ -126,6 +139,7 @@ func TestOverrideWithEnvvars(t *testing.T) {
 
 	// Verify overrides.
 	phase = "overrides"
+	equalBool(t, phase, debugKey, testDebug, Get.Debug)
 	equalStrings(t, phase, folderKey, testFolder, Get.Folder)
 	equalStrings(t, phase, hostKey, testHost, Get.Host)
 	equalUint16(t, phase, portKey, testPort, Get.Port)

handle/handle.go

@@ -1,6 +1,7 @@
 package handle
 
 import (
+	"log"
 	"net/http"
 	"strings"
 )
@@ -21,23 +22,43 @@ var (
 // occur.
 type ListenerFunc func(string, http.HandlerFunc) error
 
+// FileServerFunc is used to serve the file from the local file system to the
+// requesting client.
+type FileServerFunc func(http.ResponseWriter, *http.Request, string)
+
+// WithLogging returns a function that logs information about the request prior
+// to serving the requested file.
+func WithLogging(serveFile FileServerFunc) FileServerFunc {
+	return func(w http.ResponseWriter, r *http.Request, name string) {
+		log.Printf(
+			"REQ: %s %s %s%s -> %s\n",
+			r.Method,
+			r.Proto,
+			r.Host,
+			r.URL.Path,
+			name,
+		)
+		serveFile(w, r, name)
+	}
+}
+
 // Basic file handler servers files from the passed folder.
-func Basic(folder string) http.HandlerFunc {
+func Basic(serveFile FileServerFunc, folder string) http.HandlerFunc {
 	return func(w http.ResponseWriter, r *http.Request) {
-		http.ServeFile(w, r, folder+r.URL.Path)
+		serveFile(w, r, folder+r.URL.Path)
 	}
 }
 
 // Prefix file handler is an alternative to Basic where a URL prefix is removed
 // prior to serving a file (http://my.machine/prefix/file.txt will serve
 // file.txt from the root of the folder being served (ignoring 'prefix')).
-func Prefix(folder, urlPrefix string) http.HandlerFunc {
+func Prefix(serveFile FileServerFunc, folder, urlPrefix string) http.HandlerFunc {
 	return func(w http.ResponseWriter, r *http.Request) {
 		if !strings.HasPrefix(r.URL.Path, urlPrefix) {
 			http.NotFound(w, r)
 			return
 		}
-		http.ServeFile(w, r, folder+strings.TrimPrefix(r.URL.Path, urlPrefix))
+		serveFile(w, r, folder+strings.TrimPrefix(r.URL.Path, urlPrefix))
 	}
 }