mirror of https://github.com/knative/caching.git
110 lines
2.5 KiB
Go
110 lines
2.5 KiB
Go
/*
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Copyright 2025 The Knative 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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http://www.apache.org/licenses/LICENSE-2.0
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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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*/
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package parser
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import (
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"fmt"
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"strconv"
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"time"
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)
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// ParseFunc is a function taking ConfigMap data and applying a parse operation to it.
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type ParseFunc func(map[string]string) error
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func Parse(data map[string]string, parsers ...ParseFunc) error {
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for _, parse := range parsers {
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if err := parse(data); err != nil {
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return err
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}
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}
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return nil
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}
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func AsFunc[T any](
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key string,
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target *T,
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parseVal func(s string) (T, error),
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) ParseFunc {
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return func(data map[string]string) error {
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if raw, ok := data[key]; ok {
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val, err := parseVal(raw)
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if err != nil {
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return fmt.Errorf("failed to parse %q: %w", key, err)
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}
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*target = val
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}
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return nil
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}
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}
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func As[T parseable](key string, target *T) ParseFunc {
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return AsFunc(key, target, parse)
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}
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type parseable interface {
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int | int16 | int32 | int64 |
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uint | uint16 | uint32 | uint64 |
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string | bool | float64 | float32 |
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time.Duration
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}
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//nolint:gosec // ignore integer overflow
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func parse[T parseable](s string) (T, error) {
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var zero T
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var val any
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var err error
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switch any(zero).(type) {
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case string:
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val = s
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case int16:
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val, err = strconv.ParseInt(s, 10, 16)
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val = int16(val.(int64))
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case int32:
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val, err = strconv.ParseInt(s, 10, 32)
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val = int32(val.(int64))
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case int64:
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val, err = strconv.ParseInt(s, 10, 64)
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case uint16:
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val, err = strconv.ParseUint(s, 10, 16)
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val = uint16(val.(uint64))
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case uint32:
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val, err = strconv.ParseUint(s, 10, 32)
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val = uint32(val.(uint64))
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case uint64:
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val, err = strconv.ParseUint(s, 10, 64)
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case float64:
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val, err = strconv.ParseFloat(s, 64)
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case float32:
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val, err = strconv.ParseFloat(s, 64)
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val = float32(val.(float64))
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case bool:
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val, err = strconv.ParseBool(s)
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case time.Duration:
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val, err = time.ParseDuration(s)
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case int:
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val, err = strconv.ParseInt(s, 10, 0)
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val = int(val.(int64))
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case uint:
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val, err = strconv.ParseUint(s, 10, 0)
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val = uint(val.(uint64))
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}
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return val.(T), err
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}
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