mirror of
https://github.com/prometheus/prometheus.git
synced 2024-11-09 23:24:05 -08:00
93 lines
2.7 KiB
Go
93 lines
2.7 KiB
Go
// Copyright 2024 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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package config
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import (
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"crypto/sha256"
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"encoding/hex"
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"fmt"
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"os"
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"path/filepath"
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"gopkg.in/yaml.v2"
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)
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type ExternalFilesConfig struct {
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RuleFiles []string `yaml:"rule_files"`
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ScrapeConfigFiles []string `yaml:"scrape_config_files"`
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}
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// GenerateChecksum generates a checksum of the YAML file and the files it references.
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func GenerateChecksum(yamlFilePath string) (string, error) {
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hash := sha256.New()
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yamlContent, err := os.ReadFile(yamlFilePath)
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if err != nil {
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return "", fmt.Errorf("error reading YAML file: %w", err)
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}
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_, err = hash.Write(yamlContent)
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if err != nil {
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return "", fmt.Errorf("error writing YAML file to hash: %w", err)
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}
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var config ExternalFilesConfig
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if err := yaml.Unmarshal(yamlContent, &config); err != nil {
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return "", fmt.Errorf("error unmarshalling YAML: %w", err)
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}
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dir := filepath.Dir(yamlFilePath)
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for i, file := range config.RuleFiles {
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config.RuleFiles[i] = filepath.Join(dir, file)
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}
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for i, file := range config.ScrapeConfigFiles {
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config.ScrapeConfigFiles[i] = filepath.Join(dir, file)
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}
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files := map[string][]string{
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"r": config.RuleFiles, // "r" for rule files
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"s": config.ScrapeConfigFiles, // "s" for scrape config files
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}
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for _, prefix := range []string{"r", "s"} {
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for _, pattern := range files[prefix] {
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matchingFiles, err := filepath.Glob(pattern)
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if err != nil {
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return "", fmt.Errorf("error finding files with pattern %q: %w", pattern, err)
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}
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for _, file := range matchingFiles {
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// Write prefix to the hash ("r" or "s") followed by \0, then
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// the file path.
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_, err = hash.Write([]byte(prefix + "\x00" + file + "\x00"))
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if err != nil {
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return "", fmt.Errorf("error writing %q path to hash: %w", file, err)
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}
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// Read and hash the content of the file.
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content, err := os.ReadFile(file)
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if err != nil {
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return "", fmt.Errorf("error reading file %s: %w", file, err)
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}
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_, err = hash.Write(append(content, []byte("\x00")...))
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if err != nil {
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return "", fmt.Errorf("error writing %q content to hash: %w", file, err)
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}
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}
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}
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}
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return hex.EncodeToString(hash.Sum(nil)), nil
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}
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