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Move cron scheduling inside application (#338)
* Move cron scheduling inside application * Make envvar a fallback and check for errors * Panic significantly less * propagate error out of runBackup * Add structured logging * FIx error propagation to exit * Enable the new scheduler by default * Review fixes * Added docs and better error propagation
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,81 @@ | ||
| // Copyright 2021-2022 - Offen Authors <[email protected]> | ||
| // SPDX-License-Identifier: MPL-2.0 | ||
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| package main | ||
|
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| import ( | ||
| "fmt" | ||
| "os" | ||
| "path/filepath" | ||
|
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| "github.com/joho/godotenv" | ||
| "github.com/offen/envconfig" | ||
| ) | ||
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| // envProxy is a function that mimics os.LookupEnv but can read values from any other source | ||
| type envProxy func(string) (string, bool) | ||
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| func loadConfig(lookup envProxy) (*Config, error) { | ||
| envconfig.Lookup = func(key string) (string, bool) { | ||
| value, okValue := lookup(key) | ||
| location, okFile := lookup(key + "_FILE") | ||
|
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| switch { | ||
| case okValue && !okFile: // only value | ||
| return value, true | ||
| case !okValue && okFile: // only file | ||
| contents, err := os.ReadFile(location) | ||
| if err != nil { | ||
| return "", false | ||
| } | ||
| return string(contents), true | ||
| case okValue && okFile: // both | ||
| return "", false | ||
| default: // neither, ignore | ||
| return "", false | ||
| } | ||
| } | ||
|
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| var c = &Config{} | ||
| if err := envconfig.Process("", c); err != nil { | ||
| return nil, fmt.Errorf("failed to process configuration values, error: %w", err) | ||
| } | ||
|
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| return c, nil | ||
| } | ||
|
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| func loadEnvVars() (*Config, error) { | ||
| return loadConfig(os.LookupEnv) | ||
| } | ||
|
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| func loadEnvFiles(directory string) ([]*Config, error) { | ||
| items, err := os.ReadDir(directory) | ||
| if err != nil { | ||
| if os.IsNotExist(err) { | ||
| return nil, err | ||
| } | ||
| return nil, fmt.Errorf("failed to read files from env directory, error: %w", err) | ||
| } | ||
|
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| var cs = make([]*Config, 0) | ||
| for _, item := range items { | ||
| if !item.IsDir() { | ||
| p := filepath.Join(directory, item.Name()) | ||
| envFile, err := godotenv.Read(p) | ||
| if err != nil { | ||
| return nil, fmt.Errorf("error reading config file %s, error: %w", p, err) | ||
| } | ||
| lookup := func(key string) (string, bool) { | ||
| val, ok := envFile[key] | ||
| return val, ok | ||
| } | ||
| c, err := loadConfig(lookup) | ||
| if err != nil { | ||
| return nil, fmt.Errorf("error loading config from file %s, error: %w", p, err) | ||
| } | ||
| cs = append(cs, c) | ||
| } | ||
| } | ||
|
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| return cs, nil | ||
| } |
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