Simplify config handling in main()

_support/validate-formatting.sh

 #!/bin/sh
 
-set -eu
-
 IMPORT_RESULT=$(goimports -e -local "gitlab.com/gitlab-org/gitlab-workhorse" -l "$@")
 
 if [ -n "${IMPORT_RESULT}" ]; then

changelogs/unreleased/jv-config-struct.yml

+---
+title: Simplify config handling in main()
+merge_request: 634
+author:
+type: other

config_test.go

+package main
+
+import (
+	"flag"
+	"io"
+	"io/ioutil"
+	"net/url"
+	"os"
+	"testing"
+	"time"
+
+	"github.com/stretchr/testify/require"
+
+	"gitlab.com/gitlab-org/gitlab-workhorse/internal/config"
+	"gitlab.com/gitlab-org/gitlab-workhorse/internal/queueing"
+	"gitlab.com/gitlab-org/gitlab-workhorse/internal/upstream"
+)
+
+func TestConfigFile(t *testing.T) {
+	f, err := ioutil.TempFile("", "workhorse-config-test")
+	require.NoError(t, err)
+	defer os.Remove(f.Name())
+
+	data := `
+[redis]
+password = "redis password"
+[object_storage]
+provider = "test provider"
+[image_resizer]
+max_scaler_procs = 123
+`
+	_, err = io.WriteString(f, data)
+	require.NoError(t, err)
+	require.NoError(t, f.Close())
+
+	_, cfg, err := buildConfig("test", []string{"-config", f.Name()})
+	require.NoError(t, err, "build config")
+
+	// These are integration tests: we want to see that each section in the
+	// config file ends up in the config struct. We do not test all the
+	// fields in each section; that should happen in the tests of the
+	// internal/config package.
+	require.Equal(t, "redis password", cfg.Redis.Password)
+	require.Equal(t, "test provider", cfg.ObjectStorageCredentials.Provider)
+	require.Equal(t, uint32(123), cfg.ImageResizerConfig.MaxScalerProcs, "image resizer max_scaler_procs")
+}
+
+func TestConfigErrorHelp(t *testing.T) {
+	for _, f := range []string{"-h", "-help"} {
+		t.Run(f, func(t *testing.T) {
+			_, _, err := buildConfig("test", []string{f})
+			require.Equal(t, alreadyPrintedError{flag.ErrHelp}, err)
+		})
+	}
+}
+
+func TestConfigError(t *testing.T) {
+	for _, arg := range []string{"-foobar", "foobar"} {
+		t.Run(arg, func(t *testing.T) {
+			_, _, err := buildConfig("test", []string{arg})
+
+			require.Error(t, err)
+			require.IsType(t, alreadyPrintedError{}, err)
+		})
+	}
+}
+
+func TestConfigDefaults(t *testing.T) {
+	boot, cfg, err := buildConfig("test", nil)
+	require.NoError(t, err, "build config")
+
+	expectedBoot := &bootConfig{
+		secretPath:    "./.gitlab_workhorse_secret",
+		listenAddr:    "localhost:8181",
+		listenNetwork: "tcp",
+		logFormat:     "text",
+	}
+
+	require.Equal(t, expectedBoot, boot)
+
+	expectedCfg := &config.Config{
+		Backend:                  upstream.DefaultBackend,
+		CableBackend:             upstream.DefaultBackend,
+		Version:                  "(unknown version)",
+		DocumentRoot:             "public",
+		ProxyHeadersTimeout:      5 * time.Minute,
+		APIQueueTimeout:          queueing.DefaultTimeout,
+		APICILongPollingDuration: 50 * time.Nanosecond, // TODO this is meant to be 50*time.Second but it has been wrong for ages
+		ImageResizerConfig:       config.DefaultImageResizerConfig,
+	}
+
+	require.Equal(t, expectedCfg, cfg)
+}
+
+func TestConfigFlagParsing(t *testing.T) {
+	backendURL, err := url.Parse("http://localhost:1234")
+	require.NoError(t, err)
+	cableURL, err := url.Parse("http://localhost:5678")
+	require.NoError(t, err)
+
+	args := []string{
+		"-version",
+		"-secretPath", "secret path",
+		"-listenAddr", "listen addr",
+		"-listenNetwork", "listen network",
+		"-listenUmask", "123",
+		"-pprofListenAddr", "pprof listen addr",
+		"-prometheusListenAddr", "prometheus listen addr",
+		"-logFile", "log file",
+		"-logFormat", "log format",
+		"-documentRoot", "document root",
+		"-developmentMode",
+		"-authBackend", backendURL.String(),
+		"-authSocket", "auth socket",
+		"-cableBackend", cableURL.String(),
+		"-cableSocket", "cable socket",
+		"-proxyHeadersTimeout", "10m",
+		"-apiLimit", "234",
+		"-apiQueueLimit", "345",
+		"-apiQueueDuration", "123s",
+		"-apiCiLongPollingDuration", "234s",
+		"-propagateCorrelationID",
+	}
+	boot, cfg, err := buildConfig("test", args)
+	require.NoError(t, err, "build config")
+
+	expectedBoot := &bootConfig{
+		secretPath:           "secret path",
+		listenAddr:           "listen addr",
+		listenNetwork:        "listen network",
+		listenUmask:          123,
+		pprofListenAddr:      "pprof listen addr",
+		prometheusListenAddr: "prometheus listen addr",
+		logFile:              "log file",
+		logFormat:            "log format",
+		printVersion:         true,
+	}
+	require.Equal(t, expectedBoot, boot)
+
+	expectedCfg := &config.Config{
+		DocumentRoot:             "document root",
+		DevelopmentMode:          true,
+		Backend:                  backendURL,
+		Socket:                   "auth socket",
+		CableBackend:             cableURL,
+		CableSocket:              "cable socket",
+		Version:                  "(unknown version)",
+		ProxyHeadersTimeout:      10 * time.Minute,
+		APILimit:                 234,
+		APIQueueLimit:            345,
+		APIQueueTimeout:          123 * time.Second,
+		APICILongPollingDuration: 234 * time.Second,
+		PropagateCorrelationID:   true,
+		ImageResizerConfig:       config.DefaultImageResizerConfig,
+	}
+	require.Equal(t, expectedCfg, cfg)
+}

internal/config/config.go

@@ -115,11 +115,10 @@ var DefaultImageResizerConfig = &ImageResizerConfig{
 	MaxFilesize:    DefaultImageResizerMaxFilesize,
 }
 
-// LoadConfig from a file
-func LoadConfig(filename string) (*Config, error) {
+func LoadConfig(data string) (*Config, error) {
 	cfg := &Config{ImageResizerConfig: DefaultImageResizerConfig}
 
-	if _, err := toml.DecodeFile(filename, cfg); err != nil {
+	if _, err := toml.Decode(data, cfg); err != nil {
 		return nil, err
 	}
 

internal/config/config_test.go

 package config
 
 import (
-	"io/ioutil"
-	"os"
 	"testing"
 
 	"github.com/stretchr/testify/require"
@@ -20,13 +18,20 @@ azure_storage_access_key = "deadbeef"
 func TestLoadEmptyConfig(t *testing.T) {
 	config := ``
 
-	tmpFile, cfg := loadTempConfig(t, config)
-	defer os.Remove(tmpFile.Name())
+	cfg, err := LoadConfig(config)
+	require.NoError(t, err)
 
-	require.Nil(t, cfg.ObjectStorageCredentials)
+	expected := Config{
+		ImageResizerConfig: &ImageResizerConfig{
+			MaxScalerProcs: DefaultImageResizerMaxScalerProcs,
+			MaxFilesize:    DefaultImageResizerMaxFilesize,
+		},
+	}
 
-	err := cfg.RegisterGoCloudURLOpeners()
-	require.NoError(t, err)
+	require.Equal(t, expected, *cfg)
+
+	require.Nil(t, cfg.ObjectStorageCredentials)
+	require.NoError(t, cfg.RegisterGoCloudURLOpeners())
 }
 
 func TestLoadObjectStorageConfig(t *testing.T) {
@@ -39,8 +44,8 @@ aws_access_key_id = "minio"
 aws_secret_access_key = "gdk-minio"
 `
 
-	tmpFile, cfg := loadTempConfig(t, config)
-	defer os.Remove(tmpFile.Name())
+	cfg, err := LoadConfig(config)
+	require.NoError(t, err)
 
 	require.NotNil(t, cfg.ObjectStorageCredentials, "Expected object storage credentials")
 
@@ -56,8 +61,8 @@ aws_secret_access_key = "gdk-minio"
 }
 
 func TestRegisterGoCloudURLOpeners(t *testing.T) {
-	tmpFile, cfg := loadTempConfig(t, azureConfig)
-	defer os.Remove(tmpFile.Name())
+	cfg, err := LoadConfig(azureConfig)
+	require.NoError(t, err)
 
 	require.NotNil(t, cfg.ObjectStorageCredentials, "Expected object storage credentials")
 
@@ -72,30 +77,13 @@ func TestRegisterGoCloudURLOpeners(t *testing.T) {
 	require.Equal(t, expected, *cfg.ObjectStorageCredentials)
 	require.Nil(t, cfg.ObjectStorageConfig.URLMux)
 
-	err := cfg.RegisterGoCloudURLOpeners()
-	require.NoError(t, err)
+	require.NoError(t, cfg.RegisterGoCloudURLOpeners())
 	require.NotNil(t, cfg.ObjectStorageConfig.URLMux)
 
 	require.True(t, cfg.ObjectStorageConfig.URLMux.ValidBucketScheme("azblob"))
 	require.Equal(t, []string{"azblob"}, cfg.ObjectStorageConfig.URLMux.BucketSchemes())
 }
 
-func TestLoadDefaultConfig(t *testing.T) {
-	config := ``
-
-	tmpFile, cfg := loadTempConfig(t, config)
-	defer os.Remove(tmpFile.Name())
-
-	expected := Config{
-		ImageResizerConfig: &ImageResizerConfig{
-			MaxScalerProcs: DefaultImageResizerMaxScalerProcs,
-			MaxFilesize:    DefaultImageResizerMaxFilesize,
-		},
-	}
-
-	require.Equal(t, expected, *cfg)
-}
-
 func TestLoadImageResizerConfig(t *testing.T) {
 	config := `
 [image_resizer]
@@ -103,8 +91,8 @@ max_scaler_procs = 200
 max_filesize = 350000
 `
 
-	tmpFile, cfg := loadTempConfig(t, config)
-	defer os.Remove(tmpFile.Name())
+	cfg, err := LoadConfig(config)
+	require.NoError(t, err)
 
 	require.NotNil(t, cfg.ImageResizerConfig, "Expected image resizer config")
 
@@ -115,16 +103,3 @@ max_filesize = 350000
 
 	require.Equal(t, expected, *cfg.ImageResizerConfig)
 }
-
-func loadTempConfig(t *testing.T, config string) (f *os.File, cfg *Config) {
-	tmpFile, err := ioutil.TempFile(os.TempDir(), "test-")
-	require.NoError(t, err)
-
-	_, err = tmpFile.Write([]byte(config))
-	require.NoError(t, err)
-
-	cfg, err = LoadConfig(tmpFile.Name())
-	require.NoError(t, err)
-
-	return tmpFile, cfg
-}

internal/config/url_openers_test.go

@@ -3,7 +3,6 @@ package config
 import (
 	"context"
 	"net/url"
-	"os"
 	"testing"
 
 	"github.com/stretchr/testify/require"
@@ -11,13 +10,12 @@ import (
 )
 
 func TestURLOpeners(t *testing.T) {
-	tmpFile, cfg := loadTempConfig(t, azureConfig)
-	defer os.Remove(tmpFile.Name())
+	cfg, err := LoadConfig(azureConfig)
+	require.NoError(t, err)
 
 	require.NotNil(t, cfg.ObjectStorageCredentials, "Expected object storage credentials")
 
-	err := cfg.RegisterGoCloudURLOpeners()
-	require.NoError(t, err)
+	require.NoError(t, cfg.RegisterGoCloudURLOpeners())
 	require.NotNil(t, cfg.ObjectStorageConfig.URLMux)
 
 	tests := []struct {

logging.go

@@ -18,26 +18,20 @@ const (
 	noneLogType      = "none"
 )
 
-type logConfiguration struct {
-	logFile   string
-	logFormat string
-}
-
-func startLogging(config logConfiguration) (io.Closer, error) {
+func startLogging(file string, format string) (io.Closer, error) {
 	// Golog always goes to stderr
 	goLog.SetOutput(os.Stderr)
 
-	logFile := config.logFile
-	if logFile == "" {
-		logFile = "stderr"
+	if file == "" {
+		file = "stderr"
 	}
 
-	switch config.logFormat {
+	switch format {
 	case noneLogType:
 		return logkit.Initialize(logkit.WithWriter(ioutil.Discard))
 	case jsonLogFormat:
 		return logkit.Initialize(
-			logkit.WithOutputName(logFile),
+			logkit.WithOutputName(file),
 			logkit.WithFormatter("json"),
 		)
 	case textLogFormat:
@@ -48,23 +42,22 @@ func startLogging(config logConfiguration) (io.Closer, error) {
 		)
 	case structuredFormat:
 		return logkit.Initialize(
-			logkit.WithOutputName(logFile),
+			logkit.WithOutputName(file),
 			logkit.WithFormatter("color"),
 		)
 	}
 
-	return nil, fmt.Errorf("unknown logFormat: %v", config.logFormat)
+	return nil, fmt.Errorf("unknown logFormat: %v", format)
 }
 
 // In text format, we use a separate logger for access logs
-func getAccessLogger(config logConfiguration) (*log.Logger, io.Closer, error) {
-	if config.logFormat != "text" {
+func getAccessLogger(file string, format string) (*log.Logger, io.Closer, error) {
+	if format != "text" {
 		return log.StandardLogger(), ioutil.NopCloser(nil), nil
 	}
 
-	logFile := config.logFile
-	if logFile == "" {
-		logFile = "stderr"
+	if file == "" {
+		file = "stderr"
 	}
 
 	accessLogger := log.New()
@@ -72,7 +65,7 @@ func getAccessLogger(config logConfiguration) (*log.Logger, io.Closer, error) {
 	closer, err := logkit.Initialize(
 		logkit.WithLogger(accessLogger),  // Configure `accessLogger`
 		logkit.WithFormatter("combined"), // Use the combined formatter
-		logkit.WithOutputName(logFile),
+		logkit.WithOutputName(file),
 	)
 
 	return accessLogger, closer, err

main_test.go

@@ -38,6 +38,9 @@ import (
 const scratchDir = "testdata/scratch"
 const testRepoRoot = "testdata/data"
 const testDocumentRoot = "testdata/public"
+
+var absDocumentRoot string
+
 const testRepo = "group/test.git"
 const testProject = "group/test"
 
@@ -183,7 +186,7 @@ func TestAllowedPublicUploadsFile(t *testing.T) {
 	proxied := false
 	ts := testhelper.TestServerWithHandler(regexp.MustCompile(`.`), func(w http.ResponseWriter, r *http.Request) {
 		proxied = true
-		w.Header().Add("X-Sendfile", *documentRoot+r.URL.Path)
+		w.Header().Add("X-Sendfile", absDocumentRoot+r.URL.Path)
 		w.WriteHeader(200)
 	})
 	defer ts.Close()
@@ -577,11 +580,11 @@ func setupStaticFile(fpath, content string) error {
 	if err != nil {
 		return err
 	}
-	*documentRoot = path.Join(cwd, testDocumentRoot)
-	if err := os.MkdirAll(path.Join(*documentRoot, path.Dir(fpath)), 0755); err != nil {
+	absDocumentRoot = path.Join(cwd, testDocumentRoot)
+	if err := os.MkdirAll(path.Join(absDocumentRoot, path.Dir(fpath)), 0755); err != nil {
 		return err
 	}
-	staticFile := path.Join(*documentRoot, fpath)
+	staticFile := path.Join(absDocumentRoot, fpath)
 	return ioutil.WriteFile(staticFile, []byte(content), 0666)
 }