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92 lines
2.7 KiB
92 lines
2.7 KiB
// 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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