83 lines
2.2 KiB
Go
83 lines
2.2 KiB
Go
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/*
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Copyright 2020, 2021 Jan Dittberner
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package services
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import (
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"fmt"
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"os"
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"strings"
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"github.com/knadh/koanf"
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"github.com/knadh/koanf/parsers/toml"
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"github.com/knadh/koanf/providers/confmap"
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"github.com/knadh/koanf/providers/env"
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"github.com/knadh/koanf/providers/file"
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"github.com/knadh/koanf/providers/posflag"
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"github.com/sirupsen/logrus"
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"github.com/spf13/pflag"
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)
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func ConfigureApplication(
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logger *logrus.Logger,
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appName string,
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defaultConfig map[string]interface{},
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) (*koanf.Koanf, error) {
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f := pflag.NewFlagSet("config", pflag.ContinueOnError)
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f.Usage = func() {
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fmt.Println(f.FlagUsages())
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os.Exit(0)
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}
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f.StringSlice(
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"conf",
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[]string{fmt.Sprintf("%s.toml", strings.ToLower(appName))},
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"path to one or more .toml files",
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)
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var err error
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if err = f.Parse(os.Args[1:]); err != nil {
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logger.Fatal(err)
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}
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config := koanf.New(".")
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_ = config.Load(confmap.Provider(defaultConfig, "."), nil)
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cFiles, _ := f.GetStringSlice("conf")
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for _, c := range cFiles {
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if err := config.Load(file.Provider(c), toml.Parser()); err != nil {
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logger.Fatalf("error loading config file: %s", err)
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}
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}
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if err := config.Load(posflag.Provider(f, ".", config), nil); err != nil {
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logger.Fatalf("error loading configuration: %s", err)
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}
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if err := config.Load(
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file.Provider("resource_app.toml"),
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toml.Parser(),
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); err != nil && !os.IsNotExist(err) {
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logrus.Fatalf("error loading config: %v", err)
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}
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prefix := fmt.Sprintf("%s_", strings.ToUpper(appName))
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if err := config.Load(env.Provider(prefix, ".", func(s string) string {
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return strings.Replace(strings.ToLower(
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strings.TrimPrefix(s, prefix)), "_", ".", -1)
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}), nil); err != nil {
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logrus.Fatalf("error loading config: %v", err)
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}
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return config, err
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}
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