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package repository
import (
"errors"
"strconv"
"time"
)
var (
ErrNoConfigEntry = errors.New("no config entry for the given key")
ErrMultipleConfigEntry = errors.New("multiple config entry for the given key")
)
// Config represent the common function interacting with the repository config storage
type Config interface {
ConfigRead
ConfigWrite
}
type ConfigRead interface {
// ReadAll reads all key/value pair matching the key prefix
ReadAll(keyPrefix string) (map[string]string, error)
// ReadBool read a single boolean value from the config
// Return ErrNoConfigEntry or ErrMultipleConfigEntry if
// there is zero or more than one entry for this key
ReadBool(key string) (bool, error)
// ReadBool read a single string value from the config
// Return ErrNoConfigEntry or ErrMultipleConfigEntry if
// there is zero or more than one entry for this key
ReadString(key string) (string, error)
// ReadTimestamp read a single timestamp value from the config
// Return ErrNoConfigEntry or ErrMultipleConfigEntry if
// there is zero or more than one entry for this key
ReadTimestamp(key string) (time.Time, error)
}
type ConfigWrite interface {
// Store writes a single key/value pair in the config
StoreString(key, value string) error
// Store writes a key and timestamp value to the config
StoreTimestamp(key string, value time.Time) error
// Store writes a key and boolean value to the config
StoreBool(key string, value bool) error
// RemoveAll removes all key/value pair matching the key prefix
RemoveAll(keyPrefix string) error
}
func ParseTimestamp(s string) (time.Time, error) {
timestamp, err := strconv.Atoi(s)
if err != nil {
return time.Time{}, err
}
return time.Unix(int64(timestamp), 0), nil
}
// mergeConfig is a helper to easily support RepoConfig.AnyConfig()
// from two separate local and global Config
func mergeConfig(local ConfigRead, global ConfigRead) *mergedConfig {
return &mergedConfig{
local: local,
global: global,
}
}
var _ ConfigRead = &mergedConfig{}
type mergedConfig struct {
local ConfigRead
global ConfigRead
}
func (m *mergedConfig) ReadAll(keyPrefix string) (map[string]string, error) {
values, err := m.global.ReadAll(keyPrefix)
if err != nil {
return nil, err
}
locals, err := m.local.ReadAll(keyPrefix)
if err != nil {
return nil, err
}
for k, val := range locals {
values[k] = val
}
return values, nil
}
func (m *mergedConfig) ReadBool(key string) (bool, error) {
v, err := m.local.ReadBool(key)
if err == nil {
return v, nil
}
if err != ErrNoConfigEntry && err != ErrMultipleConfigEntry {
return false, err
}
return m.global.ReadBool(key)
}
func (m *mergedConfig) ReadString(key string) (string, error) {
val, err := m.local.ReadString(key)
if err == nil {
return val, nil
}
if err != ErrNoConfigEntry && err != ErrMultipleConfigEntry {
return "", err
}
return m.global.ReadString(key)
}
func (m *mergedConfig) ReadTimestamp(key string) (time.Time, error) {
val, err := m.local.ReadTimestamp(key)
if err == nil {
return val, nil
}
if err != ErrNoConfigEntry && err != ErrMultipleConfigEntry {
return time.Time{}, err
}
return m.global.ReadTimestamp(key)
}
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