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Jan-Otto KröpkeandClaude Opus 5.5
831436f48d
Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com> Signed-off-by: Jan-Otto Kröpke <mail@jkroepke.de>
102 lines
3.0 KiB
Go
102 lines
3.0 KiB
Go
// SPDX-License-Identifier: Apache-2.0
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//
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// Copyright The Prometheus Authors
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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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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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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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//go:build windows
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// Package yamlstring decodes configuration file blocks whose value is a YAML or
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// JSON document kept as a string, like the objects of the performancecounter
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// collector.
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package yamlstring
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import (
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"errors"
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"fmt"
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"io"
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"strings"
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"go.yaml.in/yaml/v3"
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)
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// DecodeBlock decodes node, the configuration file block of a collector, into
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// target. key must be the only key of the block, and its value a string holding
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// a YAML or JSON list, the same value the collector's flag takes. A null value
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// leaves target unchanged.
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//
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// Unknown keys, in the block and in the list, are rejected, like everywhere else
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// in the configuration file. The errors are returned as a [yaml.TypeError], so
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// the decoder reports them together with the other errors of the file.
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func DecodeBlock[T any](node *yaml.Node, key string, target *[]T) error {
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if node.Kind != yaml.MappingNode {
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return &yaml.TypeError{Errors: []string{
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fmt.Sprintf("line %d: cannot unmarshal %s into a block with the key %s", node.Line, node.ShortTag(), key),
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}}
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}
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var errs []string
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for i := 0; i+1 < len(node.Content); i += 2 {
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name, value := node.Content[i], node.Content[i+1]
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if name.Value != key {
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errs = append(errs, fmt.Sprintf("line %d: field %s not found, the only field is %s", name.Line, name.Value, key))
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continue
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}
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errs = append(errs, decodeValue(value, key, target)...)
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}
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if len(errs) > 0 {
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return &yaml.TypeError{Errors: errs}
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}
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return nil
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}
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// decodeValue decodes the string value of key into target and returns the
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// errors, if any. Line numbers inside the string count from its first line.
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func decodeValue[T any](value *yaml.Node, key string, target *[]T) []string {
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if value.ShortTag() == "!!null" {
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return nil
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}
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if value.Kind != yaml.ScalarNode || value.ShortTag() != "!!str" {
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return []string{fmt.Sprintf("line %d: %s must be a string, use %s: |- followed by the list", value.Line, key, key)}
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}
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decoder := yaml.NewDecoder(strings.NewReader(value.Value))
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decoder.KnownFields(true)
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var list []T
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if err := decoder.Decode(&list); err != nil && !errors.Is(err, io.EOF) {
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var typeErr *yaml.TypeError
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if !errors.As(err, &typeErr) {
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return []string{fmt.Sprintf("line %d: in %s, %s", value.Line, key, err)}
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}
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errs := make([]string, len(typeErr.Errors))
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for i, e := range typeErr.Errors {
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errs[i] = fmt.Sprintf("line %d: in %s, %s", value.Line, key, e)
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}
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return errs
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}
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*target = list
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return nil
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}
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