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45 lines
1.5 KiB
Go
45 lines
1.5 KiB
Go
package main
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import (
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"encoding/json"
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"net/http"
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)
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type envelope map[string]any
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// This was the original function signature without enveloping
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// func (app *application) writeJSON(w http.ResponseWriter, status int, data any, headers http.Header) error {
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func (app *application) writeJSON(w http.ResponseWriter, status int, data envelope, headers http.Header) error {
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// TODO set a flag for wether to indent or not. Indenting cost CPU time, more memory, and more allocs
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// approximately 65% more time 30% more mem.
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//js, err := json.Marshal(data)
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// Use the json.MarshalIndent() function so that whitespace is added to the encoded
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// JSON. Here we use no line prefix ("") and tab indents ("\t") for each element.
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js, err := json.MarshalIndent(data, "", "\t")
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if err != nil {
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return err
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}
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js = append(js, '\n')
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// At this point, we know that we won't encounter any more errors before writing the
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// response, so it's safe to add any headers that we want to include. We loop
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// through the header map and add each header to the http.ResponseWriter header map.
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// Note that it's OK if the provided header map is nil. Go doesn't throw an error
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// if you try to range over (or generally, read from) a nil map.
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for key, value := range headers {
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w.Header()[key] = value
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}
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// Add the "Content-Type: application/json" header, then write the status code and
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// JSON response.
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w.Header().Set("Content-Type", "application/json")
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w.WriteHeader(status)
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w.Write(js)
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return nil
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}
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