joao/pkg/config/lookup.go

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// Copyright © 2022 Roberto Hidalgo <joao@un.rob.mx>
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package config
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import (
"fmt"
"os"
"strings"
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"github.com/sirupsen/logrus"
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"gopkg.in/yaml.v3"
)
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func (cfg *Config) Lookup(query []string) (*Entry, error) {
if len(query) == 0 || len(query) == 1 && query[0] == "." {
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return cfg.Tree, nil
}
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entry := cfg.Tree
for _, part := range query {
entry = entry.ChildNamed(part)
if entry == nil {
return nil, fmt.Errorf("value not found at %s of %s", part, query)
}
}
return entry, nil
}
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func findRepoConfig(from string) (*opDetails, error) {
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parts := strings.Split(from, "/")
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for i := len(parts); i > 0; i-- {
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query := strings.Join(parts[0:i], "/")
if bytes, err := os.ReadFile(query + "/.joao.yaml"); err == nil {
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rmc := &opDetails{Repo: query}
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err := yaml.Unmarshal(bytes, rmc)
if err != nil {
return nil, err
}
return rmc, nil
}
}
return nil, nil
}
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func scalarsIn(data map[string]yaml.Node, parents []string) ([]string, error) {
keys := []string{}
for key, leaf := range data {
if key == "_config" && len(parents) == 0 {
continue
}
switch leaf.Kind {
case yaml.ScalarNode:
newKey := strings.Join(append(parents, key), ".")
keys = append(keys, newKey)
case yaml.MappingNode, yaml.DocumentNode, yaml.SequenceNode:
sub := map[string]yaml.Node{}
if leaf.Kind == yaml.SequenceNode {
list := []yaml.Node{}
if err := leaf.Decode(&list); err != nil {
return keys, err
}
for idx, child := range list {
sub[fmt.Sprintf("%d", idx)] = child
}
} else {
if err := leaf.Decode(&sub); err != nil {
return keys, err
}
}
ret, err := scalarsIn(sub, append(parents, key))
if err != nil {
return keys, err
}
keys = append(keys, ret...)
default:
logrus.Fatalf("found unknown %v at %s", leaf.Kind, key)
}
}
return keys, nil
}
func KeysFromYAML(data []byte) ([]string, error) {
cfg := map[string]yaml.Node{}
err := yaml.Unmarshal(data, &cfg)
if err != nil {
return nil, err
}
return scalarsIn(cfg, []string{})
}