如何通过（键入* common.MapStr）键入[] byte？

Question

Sorry if the question is too newbie, as i just started to learn go yesterday. I try to convert publishEvent into bytes, and compiler shown error like following:

cannot convert publishEvent (type *common.MapStr) to type []byte

Can anyone show me the way ?

Thank You.

    var parsed map[string]interface{}
    bytes := []byte(publishEvent) --->Error occur here
    err := json.Unmarshal(bytes, &parsed)
    if err != nil{
        fmt.Println("error: ", err)
    }

Answer 1

I assume the struct you are working with is common.MapStr from https://github.com/elastic/libbeat

common.MapStr is already a map[string]interface{} so I'm not sure why you are turing it into JSON, and then parsing it back into the same kind of structure, but if thats what you really want to do, replacing the error line with:

bytes, err := json.Marshal(publishEvent)

should work. You will get an error on the next line about redeclaring err so change it to:

err = json.Unmarshal(bytes, &parsed)

Resulting in the following code (also added another error check):

var parsed map[string]interface{}
bytes, err := json.Marshal(publishEvent)
if err != nil{
    fmt.Println("error: ", err)
    // you'll want to exit or return here since we can't parse `bytes`
}
err = json.Unmarshal(bytes, &parsed)
if err != nil{
    fmt.Println("error: ", err)
}