65 lines
1.3 KiB
Go
65 lines
1.3 KiB
Go
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package api
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import (
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"encoding/json"
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"log/slog"
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"net/http"
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"reflect"
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)
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type ErrorBody struct {
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Error string `json:"error"`
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}
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func writeJSON(w http.ResponseWriter, status int, payload any) {
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w.Header().Set("Content-Type", "application/json; charset=utf-8")
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w.WriteHeader(status)
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if payload == nil {
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_, _ = w.Write([]byte("null"))
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return
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}
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// Go nil slices/maps encode as JSON null; clients expect [] / {}.
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v := reflect.ValueOf(payload)
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switch v.Kind() {
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case reflect.Slice:
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if v.IsNil() {
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_, _ = w.Write([]byte("[]"))
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return
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}
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case reflect.Map:
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if v.IsNil() {
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_, _ = w.Write([]byte("{}"))
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return
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}
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}
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_ = json.NewEncoder(w).Encode(payload)
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}
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func writeError(r *http.Request, w http.ResponseWriter, status int, message string, cause ...error) {
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logAPIError(r, status, message, cause)
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writeJSON(w, status, ErrorBody{Error: message})
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}
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func logAPIError(r *http.Request, status int, message string, cause []error) {
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if status < 400 {
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return
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}
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attrs := []any{
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"module", "API",
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"status", status,
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"message", message,
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}
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if r != nil {
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attrs = append(attrs, "method", r.Method, "path", r.URL.Path)
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}
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if len(cause) > 0 && cause[0] != nil {
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attrs = append(attrs, "error", cause[0].Error())
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}
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switch {
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case status >= 500:
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slog.Error("request failed", attrs...)
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default:
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slog.Warn("request rejected", attrs...)
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}
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}
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