fp-go/ioeither/generic/logging.go

// Copyright (c) 2023 IBM Corp.
// All rights reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

package generic

import (
	"encoding/json"
	"log"

	B "github.com/IBM/fp-go/bytes"
	ET "github.com/IBM/fp-go/either"
	F "github.com/IBM/fp-go/function"
)

// LogJSON converts the argument to JSON and then logs it via the format string
// Can be used with [ChainFirst]
func LogJSON[GA ~func() ET.Either[error, any], A any](prefix string) func(A) GA {
	return func(a A) GA {
		// log this
		return F.Pipe3(
			ET.TryCatchError(json.MarshalIndent(a, "", "  ")),
			ET.Map[error](B.ToString),
			FromEither[func() ET.Either[error, string]],
			Chain[func() ET.Either[error, string], GA](func(data string) GA {
				return FromImpure[GA](func() {
					log.Printf(prefix, data)
				})
			}),
		)
	}
}

// LogJson converts the argument to JSON and then logs it via the format string
// Can be used with [ChainFirst]
//
// Deprecated: use [LogJSON] instead
func LogJson[GA ~func() ET.Either[error, any], A any](prefix string) func(A) GA {
	return LogJSON[GA, A](prefix)
}