forgejo/modules/setting/config_provider.go
Eng Zer Jun 13d5d2e711
Remove redundant len check around loop (#27464)
This pull request is a minor code cleanup.

From the Go specification (https://go.dev/ref/spec#For_range):

> "1. For a nil slice, the number of iterations is 0."
> "3. If the map is nil, the number of iterations is 0."

`len` returns 0 if the slice or map is nil
(https://pkg.go.dev/builtin#len). Therefore, checking `len(v) > 0`
before a loop is unnecessary.

---

At the time of writing this pull request, there wasn't a lint rule that
catches these issues. The closest I could find is
https://staticcheck.dev/docs/checks/#S103

Signed-off-by: Eng Zer Jun <engzerjun@gmail.com>
2023-10-06 14:49:37 +08:00

362 lines
9.8 KiB
Go

// Copyright 2023 The Gitea Authors. All rights reserved.
// SPDX-License-Identifier: MIT
package setting
import (
"errors"
"fmt"
"os"
"path/filepath"
"strconv"
"strings"
"time"
"code.gitea.io/gitea/modules/log"
"code.gitea.io/gitea/modules/util"
"gopkg.in/ini.v1" //nolint:depguard
)
type ConfigKey interface {
Name() string
Value() string
SetValue(v string)
In(defaultVal string, candidates []string) string
String() string
Strings(delim string) []string
MustString(defaultVal string) string
MustBool(defaultVal ...bool) bool
MustInt(defaultVal ...int) int
MustInt64(defaultVal ...int64) int64
MustDuration(defaultVal ...time.Duration) time.Duration
}
type ConfigSection interface {
Name() string
MapTo(any) error
HasKey(key string) bool
NewKey(name, value string) (ConfigKey, error)
Key(key string) ConfigKey
Keys() []ConfigKey
ChildSections() []ConfigSection
}
// ConfigProvider represents a config provider
type ConfigProvider interface {
Section(section string) ConfigSection
Sections() []ConfigSection
NewSection(name string) (ConfigSection, error)
GetSection(name string) (ConfigSection, error)
Save() error
SaveTo(filename string) error
DisableSaving()
PrepareSaving() (ConfigProvider, error)
IsLoadedFromEmpty() bool
}
type iniConfigProvider struct {
file string
ini *ini.File
disableSaving bool // disable the "Save" method because the config options could be polluted
loadedFromEmpty bool // whether the file has not existed previously
}
type iniConfigSection struct {
sec *ini.Section
}
var (
_ ConfigProvider = (*iniConfigProvider)(nil)
_ ConfigSection = (*iniConfigSection)(nil)
_ ConfigKey = (*ini.Key)(nil)
)
// ConfigSectionKey only searches the keys in the given section, but it is O(n).
// ini package has a special behavior: with "[sec] a=1" and an empty "[sec.sub]",
// then in "[sec.sub]", Key()/HasKey() can always see "a=1" because it always tries parent sections.
// It returns nil if the key doesn't exist.
func ConfigSectionKey(sec ConfigSection, key string) ConfigKey {
if sec == nil {
return nil
}
for _, k := range sec.Keys() {
if k.Name() == key {
return k
}
}
return nil
}
func ConfigSectionKeyString(sec ConfigSection, key string, def ...string) string {
k := ConfigSectionKey(sec, key)
if k != nil && k.String() != "" {
return k.String()
}
if len(def) > 0 {
return def[0]
}
return ""
}
func ConfigSectionKeyBool(sec ConfigSection, key string, def ...bool) bool {
k := ConfigSectionKey(sec, key)
if k != nil && k.String() != "" {
b, _ := strconv.ParseBool(k.String())
return b
}
if len(def) > 0 {
return def[0]
}
return false
}
// ConfigInheritedKey works like ini.Section.Key(), but it always returns a new key instance, it is O(n) because NewKey is O(n)
// and the returned key is safe to be used with "MustXxx", it doesn't change the parent's values.
// Otherwise, ini.Section.Key().MustXxx would pollute the parent section's keys.
// It never returns nil.
func ConfigInheritedKey(sec ConfigSection, key string) ConfigKey {
k := sec.Key(key)
if k != nil && k.String() != "" {
newKey, _ := sec.NewKey(k.Name(), k.String())
return newKey
}
newKey, _ := sec.NewKey(key, "")
return newKey
}
func ConfigInheritedKeyString(sec ConfigSection, key string, def ...string) string {
k := sec.Key(key)
if k != nil && k.String() != "" {
return k.String()
}
if len(def) > 0 {
return def[0]
}
return ""
}
func (s *iniConfigSection) Name() string {
return s.sec.Name()
}
func (s *iniConfigSection) MapTo(v any) error {
return s.sec.MapTo(v)
}
func (s *iniConfigSection) HasKey(key string) bool {
return s.sec.HasKey(key)
}
func (s *iniConfigSection) NewKey(name, value string) (ConfigKey, error) {
return s.sec.NewKey(name, value)
}
func (s *iniConfigSection) Key(key string) ConfigKey {
return s.sec.Key(key)
}
func (s *iniConfigSection) Keys() (keys []ConfigKey) {
for _, k := range s.sec.Keys() {
keys = append(keys, k)
}
return keys
}
func (s *iniConfigSection) ChildSections() (sections []ConfigSection) {
for _, s := range s.sec.ChildSections() {
sections = append(sections, &iniConfigSection{s})
}
return sections
}
func configProviderLoadOptions() ini.LoadOptions {
return ini.LoadOptions{
KeyValueDelimiterOnWrite: " = ",
IgnoreContinuation: true,
}
}
// NewConfigProviderFromData this function is mainly for testing purpose
func NewConfigProviderFromData(configContent string) (ConfigProvider, error) {
cfg, err := ini.LoadSources(configProviderLoadOptions(), strings.NewReader(configContent))
if err != nil {
return nil, err
}
cfg.NameMapper = ini.SnackCase
return &iniConfigProvider{
ini: cfg,
loadedFromEmpty: true,
}, nil
}
// NewConfigProviderFromFile load configuration from file.
// NOTE: do not print any log except error.
func NewConfigProviderFromFile(file string, extraConfigs ...string) (ConfigProvider, error) {
cfg := ini.Empty(configProviderLoadOptions())
loadedFromEmpty := true
if file != "" {
isFile, err := util.IsFile(file)
if err != nil {
return nil, fmt.Errorf("unable to check if %q is a file. Error: %v", file, err)
}
if isFile {
if err = cfg.Append(file); err != nil {
return nil, fmt.Errorf("failed to load config file %q: %v", file, err)
}
loadedFromEmpty = false
}
}
for _, s := range extraConfigs {
if err := cfg.Append([]byte(s)); err != nil {
return nil, fmt.Errorf("unable to append more config: %v", err)
}
}
cfg.NameMapper = ini.SnackCase
return &iniConfigProvider{
file: file,
ini: cfg,
loadedFromEmpty: loadedFromEmpty,
}, nil
}
func (p *iniConfigProvider) Section(section string) ConfigSection {
return &iniConfigSection{sec: p.ini.Section(section)}
}
func (p *iniConfigProvider) Sections() (sections []ConfigSection) {
for _, s := range p.ini.Sections() {
sections = append(sections, &iniConfigSection{s})
}
return sections
}
func (p *iniConfigProvider) NewSection(name string) (ConfigSection, error) {
sec, err := p.ini.NewSection(name)
if err != nil {
return nil, err
}
return &iniConfigSection{sec: sec}, nil
}
func (p *iniConfigProvider) GetSection(name string) (ConfigSection, error) {
sec, err := p.ini.GetSection(name)
if err != nil {
return nil, err
}
return &iniConfigSection{sec: sec}, nil
}
var errDisableSaving = errors.New("this config can't be saved, developers should prepare a new config to save")
// Save saves the content into file
func (p *iniConfigProvider) Save() error {
if p.disableSaving {
return errDisableSaving
}
filename := p.file
if filename == "" {
return fmt.Errorf("config file path must not be empty")
}
if p.loadedFromEmpty {
if err := os.MkdirAll(filepath.Dir(filename), os.ModePerm); err != nil {
return fmt.Errorf("failed to create %q: %v", filename, err)
}
}
if err := p.ini.SaveTo(filename); err != nil {
return fmt.Errorf("failed to save %q: %v", filename, err)
}
// Change permissions to be more restrictive
fi, err := os.Stat(filename)
if err != nil {
return fmt.Errorf("failed to determine current conf file permissions: %v", err)
}
if fi.Mode().Perm() > 0o600 {
if err = os.Chmod(filename, 0o600); err != nil {
log.Warn("Failed changing conf file permissions to -rw-------. Consider changing them manually.")
}
}
return nil
}
func (p *iniConfigProvider) SaveTo(filename string) error {
if p.disableSaving {
return errDisableSaving
}
return p.ini.SaveTo(filename)
}
// DisableSaving disables the saving function, use PrepareSaving to get clear config options.
func (p *iniConfigProvider) DisableSaving() {
p.disableSaving = true
}
// PrepareSaving loads the ini from file again to get clear config options.
// Otherwise, the "MustXxx" calls would have polluted the current config provider,
// it makes the "Save" outputs a lot of garbage options
// After the INI package gets refactored, no "MustXxx" pollution, this workaround can be dropped.
func (p *iniConfigProvider) PrepareSaving() (ConfigProvider, error) {
if p.file == "" {
return nil, errors.New("no config file to save")
}
return NewConfigProviderFromFile(p.file)
}
func (p *iniConfigProvider) IsLoadedFromEmpty() bool {
return p.loadedFromEmpty
}
func mustMapSetting(rootCfg ConfigProvider, sectionName string, setting any) {
if err := rootCfg.Section(sectionName).MapTo(setting); err != nil {
log.Fatal("Failed to map %s settings: %v", sectionName, err)
}
}
// DeprecatedWarnings contains the warning message for various deprecations, including: setting option, file/folder, etc
var DeprecatedWarnings []string
func deprecatedSetting(rootCfg ConfigProvider, oldSection, oldKey, newSection, newKey, version string) {
if rootCfg.Section(oldSection).HasKey(oldKey) {
msg := fmt.Sprintf("Deprecated config option `[%s]` `%s` present. Use `[%s]` `%s` instead. This fallback will be/has been removed in %s", oldSection, oldKey, newSection, newKey, version)
log.Error("%v", msg)
DeprecatedWarnings = append(DeprecatedWarnings, msg)
}
}
// deprecatedSettingDB add a hint that the configuration has been moved to database but still kept in app.ini
func deprecatedSettingDB(rootCfg ConfigProvider, oldSection, oldKey string) {
if rootCfg.Section(oldSection).HasKey(oldKey) {
log.Error("Deprecated `[%s]` `%s` present which has been copied to database table sys_setting", oldSection, oldKey)
}
}
// NewConfigProviderForLocale loads locale configuration from source and others. "string" if for a local file path, "[]byte" is for INI content
func NewConfigProviderForLocale(source any, others ...any) (ConfigProvider, error) {
iniFile, err := ini.LoadSources(ini.LoadOptions{
IgnoreInlineComment: true,
UnescapeValueCommentSymbols: true,
IgnoreContinuation: true,
}, source, others...)
if err != nil {
return nil, fmt.Errorf("unable to load locale ini: %w", err)
}
iniFile.BlockMode = false
return &iniConfigProvider{
ini: iniFile,
loadedFromEmpty: true,
}, nil
}
func init() {
ini.PrettyFormat = false
}