easyjson-unixtimestamp

WHY?

Package easyjson provides a fast and easy way to marshal/unmarshal Go structs to/from JSON without the use of reflection.

But what if your JSON contains time as unix epoch in seconds and in your Go struct you want to use time.Time?

type SensorData struct {
	SensorType SensorType `json:"type"`
	SensorSN   string     `json:"sensor_sn"`
	Timestamp  time.Time  `json:"timestamp"`
	Value      float64    `json:"value"`
}

{
    "type": "tmp",
    "sensor_sn": "00000000-0000-0000-0000-000000000000",
    "timestamp": 1592577254,
    "value": 13
}

HOW?

There are many ways to achieve this:

Write custom MarshalEasyJSON/UnmarshalEasyJSON
Create struct method to return time.Time
Use different tools like grep, sed or awk to change your easyjson generated go file.
Use this utility

WHAT?

This utility will parse easyjson generated file into AST and modify the encoder and decoder to do timestamp <-> time.Time transformations

go get github.com/troyanov/easyjson-unixtimestamp

Usage of easyjson-unixtimestamp
    -file string
        path to generated _easyjson.go file
    -jsonTag string
        json tag for the timestamp field that is unix timestamp (default "timestamp")
    -structField string
        struct field name that contains timestamp as time.Time (default "Timestamp")