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transit (go)

Transit is a data format and a set of libraries for conveying values between applications written in different languages. This library provides support for marshalling Transit data to/from Go.

This implementation's major.minor version number corresponds to the version of the Transit specification it supports.

Currently on the JSON formats are implemented. MessagePack is not implemented yet.

NOTE: Transit is a work in progress and may evolve based on feedback. As a result, while Transit is a great option for transferring data between applications, it should not yet be used for storing data durably over time. This recommendation will change when the specification is complete.

Usage

Reading data with Transit(go) involves creating a transit.Decoder and calling Decode:

package main

import (
	"fmt"
	"os"
	"github.com/russolsen/transit"
)

func ReadTransit(path string) interface{} {
	f, err := os.Open(path)

	if err != nil {
		fmt.Printf("Error opening file: %v\n", err)
		return nil
	}

	decoder := transit.NewDecoder(f)

	value, err := decoder.Decode()

	if err != nil {
		fmt.Printf("Error reading Transit data: %v\n", err)
		return nil
	}

	fmt.Printf("The value read is: %v\n", value)

	return value
}

Writing is similar:

func WriteTransit(path string, value interface{}) {
	f, err := os.OpenFile(path, os.O_WRONLY|os.O_CREATE|os.O_TRUNC, 0777)

	if err != nil {
		fmt.Printf("Error opening file: %v\n", err)
		return
	}

	encoder := transit.NewEncoder(f, false)

	err = encoder.Encode(value)

	if err != nil {
		fmt.Printf("Error writing Transit data: %v\n", err)
		return
	}
}

Default Type Mapping

Semantic Type	write accepts	read produces
null	nil	nil
string	string	string
boolean	bool	bool
integer, signed 64 bit	any signed or unsiged int type	int64
floating pt decimal	float32 or float64	float64
bytes	[]byte	[]byte
keyword	transit.Keyword	transit.Keyword
symbol	transit.Symbol	transit.Keyword
arbitrary precision decimal	big.Float or github.com/shopspring/decimal.Decimal	github.com/shopspring/decimal.Decimal
arbitrary precision integer	big.Int	big.Int
point in time	time.Time	time.Time
point in time RFC 33339	-	time.Time
u	github.com/pborman/uuid UUID	github.com/pborman/uuid UUID
uri	net/url URL	net/url URL
char	rune	rune
special numbers	As defined by math NaN and math.Inf()	TBD
array	arrays or slices	[]interface{}
map	map[interface{}]interface{}	map[interface{}]interface{}
set	transit.Set	transit.Set
list	container/list List	container/list List
map w/ composite keys	transit.CMap	transit.CMap
link	transit.Link	transit.Link
ratio	big.Rat	big.Rat

Copyright and License

This library is a Go port of the Java version created and maintained by Cognitect, therefore

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.

This README file is based on the README from transit-csharp, therefore: