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8d100af052
* [MM-16719] fixing reflection: now recursing on value, not interface adding defaults to cfgWithoutEnvOverrides adding tests * don't modify the minimalConfig
72 lines
2.1 KiB
Go
72 lines
2.1 KiB
Go
// Copyright (c) 2019-present Mattermost, Inc. All Rights Reserved.
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// See License.txt for license information.
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package config
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import (
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"reflect"
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"github.com/mattermost/mattermost-server/model"
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)
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// removeEnvOverrides returns a new config without the given environment overrides.
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// If a config variable has an environment override, that variable is set to the value that was
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// read from the store.
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func removeEnvOverrides(cfg, cfgWithoutEnv *model.Config, envOverrides map[string]interface{}) *model.Config {
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paths := getPaths(envOverrides)
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newCfg := cfg.Clone()
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for _, path := range paths {
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originalVal := getVal(cfgWithoutEnv, path)
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getVal(newCfg, path).Set(originalVal)
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}
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return newCfg
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}
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// getPaths turns a nested map into a slice of paths describing the keys of the map. Eg:
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// map[string]map[string]map[string]bool{"this":{"is first":{"path":true}, "is second":{"path":true}))) is turned into:
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// [][]string{{"this", "is first", "path"}, {"this", "is second", "path"}}
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func getPaths(m map[string]interface{}) [][]string {
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return getPathsRec(m, nil)
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}
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// getPathsRec assembles the paths (see `getPaths` above)
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func getPathsRec(src interface{}, curPath []string) [][]string {
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if srcMap, ok := src.(map[string]interface{}); ok {
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paths := [][]string{}
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for k, v := range srcMap {
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paths = append(paths, getPathsRec(v, append(curPath, k))...)
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}
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return paths
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}
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return [][]string{curPath}
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}
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// getVal walks `src` (here it starts with a model.Config, then recurses into its leaves)
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// and returns the reflect.Value of the leaf at the end `path`
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func getVal(src interface{}, path []string) reflect.Value {
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var val reflect.Value
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// If we recursed on a Value, we already have it. If we're calling on an interface{}, get the Value.
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switch v := src.(type) {
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case reflect.Value:
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val = v
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default:
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val = reflect.ValueOf(src)
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}
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// Move into the struct
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if val.Kind() == reflect.Ptr {
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val = val.Elem().FieldByName(path[0])
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} else {
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val = val.FieldByName(path[0])
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}
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if val.Kind() == reflect.Ptr {
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val = val.Elem()
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}
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if val.Kind() == reflect.Struct {
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return getVal(val, path[1:])
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}
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return val
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}
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