mirror of
https://git.sr.ht/~phw/scotty
synced 2025-04-16 10:09:28 +02:00
80 lines
2.6 KiB
Go
80 lines
2.6 KiB
Go
/*
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Copyright © 2023 Philipp Wolfer <phw@uploadedlobster.com>
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Permission is hereby granted, free of charge, to any person obtaining a copy
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of this software and associated documentation files (the "Software"), to deal
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in the Software without restriction, including without limitation the rights
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to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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copies of the Software, and to permit persons to whom the Software is
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furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included in
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all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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THE SOFTWARE.
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*/
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package backends
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import (
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"errors"
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"fmt"
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"reflect"
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"time"
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"github.com/spf13/viper"
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)
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type Backend interface {
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FromConfig(config *viper.Viper) Backend
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}
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type ListenExport interface {
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ExportListens(oldestTimestamp time.Time) ([]Listen, error)
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}
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type ListenImport interface {
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ImportListens(listens []Listen, oldestTimestamp time.Time) (ImportResult, error)
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}
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type ImportResult struct {
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Count int
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LastTimestamp time.Time
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}
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func resolveBackend(config *viper.Viper) (string, Backend, error) {
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backendName := config.GetString("backend")
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// fmt.Printf("requested backend %s\n", backendName)
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backendType := knownBackends[backendName]
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if backendType == nil {
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return backendName, nil, errors.New(fmt.Sprintf("Unknown backend %s", backendName))
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}
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return backendName, backendType().FromConfig(config), nil
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}
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func ResolveBackend[T interface{}](config *viper.Viper) (T, error) {
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expectedInterface := reflect.TypeOf((*T)(nil)).Elem()
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backendName, backend, err := resolveBackend(config)
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var result T
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if err != nil {
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return result, err
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}
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if backend != nil && reflect.TypeOf(backend).Implements(expectedInterface) {
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result = backend.(T)
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} else {
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err = errors.New(
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fmt.Sprintf("Backend %s does not implement %s", backendName, expectedInterface.String()))
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}
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return result, err
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}
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var knownBackends = map[string]func() Backend{
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"dump": func() Backend { return &DumpBackend{} },
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"listenbrainz-api": func() Backend { return &ListenBrainzApiBackend{} },
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"scrobbler-log": func() Backend { return &ScrobblerLogBackend{} },
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}
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