[chore] Global server configuration overhaul (#575)

* move config flag names and usage to config package, rewrite config package to use global Configuration{} struct

Signed-off-by: kim <grufwub@gmail.com>

* improved code comment

Signed-off-by: kim <grufwub@gmail.com>

* linter

Signed-off-by: kim <grufwub@gmail.com>

* fix unmarshaling

Signed-off-by: kim <grufwub@gmail.com>

* remove kim's custom go compiler changes

Signed-off-by: kim <grufwub@gmail.com>

* generate setter and flag-name functions, implement these in codebase

Signed-off-by: kim <grufwub@gmail.com>

* update deps

Signed-off-by: kim <grufwub@gmail.com>

* small change

Signed-off-by: kim <grufwub@gmail.com>

* appease the linter...

Signed-off-by: kim <grufwub@gmail.com>

* move configuration into ConfigState structure, ensure reloading to/from viper settings to keep in sync

Signed-off-by: kim <grufwub@gmail.com>

* lint

Signed-off-by: kim <grufwub@gmail.com>

* update code comments

Signed-off-by: kim <grufwub@gmail.com>

* fix merge issue

Signed-off-by: kim <grufwub@gmail.com>

* fix merge issue

Signed-off-by: kim <grufwub@gmail.com>

* improved version string (removes time + go version)

Signed-off-by: kim <grufwub@gmail.com>

* fix version string build to pass test script + consolidate logic in func

Signed-off-by: kim <grufwub@gmail.com>

* add license text, update config.Defaults comment

Signed-off-by: kim <grufwub@gmail.com>

* add license text to generated config helpers file

Signed-off-by: kim <grufwub@gmail.com>

* defer unlock on config.Set___(), to ensure unlocked on panic

Signed-off-by: kim <grufwub@gmail.com>

* make it more obvious which cmd flags are being attached

Signed-off-by: kim <grufwub@gmail.com>

1 files changed, 53 insertions, 0 deletions

diff --git a/internal/config/global.go b/internal/config/global.go
new file mode 100644
index 000000000..8752fc925
--- /dev/null
+++ b/internal/config/global.go
@@ -0,0 +1,53 @@
+/*
+   GoToSocial
+   Copyright (C) 2021-2022 GoToSocial Authors admin@gotosocial.org
+
+   This program is free software: you can redistribute it and/or modify
+   it under the terms of the GNU Affero General Public License as published by
+   the Free Software Foundation, either version 3 of the License, or
+   (at your option) any later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU Affero General Public License for more details.
+
+   You should have received a copy of the GNU Affero General Public License
+   along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+package config
+
+import "github.com/spf13/cobra"
+
+var global *ConfigState
+
+func init() {
+	// init global state
+	global = NewState()
+}
+
+// TODO: in the future we should move away from using globals in this config
+// package, and instead pass the ConfigState round in a global gts state.
+
+// Config provides you safe access to the global configuration.
+func Config(fn func(cfg *Configuration)) {
+	global.Config(fn)
+}
+
+// Reload will reload the current configuration values from file.
+func Reload() error {
+	return global.Reload()
+}
+
+// LoadEarlyFlags will bind specific flags from given Cobra command to global viper
+// instance, and load the current configuration values. This is useful for flags like
+// .ConfigPath which have to parsed first in order to perform early configuration load.
+func LoadEarlyFlags(cmd *cobra.Command) error {
+	return global.LoadEarlyFlags(cmd)
+}
+
+// BindFlags binds given command's pflags to the global viper instance.
+func BindFlags(cmd *cobra.Command) error {
+	return global.BindFlags(cmd)
+}