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go-swaggerでエラーレスポンスをハンドルする

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背景

swaggerに次のようなエラーレスポンスを追加したときに、クライアント側でどのようにハンドルして取り出すのか少し迷った。

...
    responses:
      "500":
        schema: "#/definitions/Error"
        headers:
          X-Hogefuga:
            type: string
...

クライアントでのハンドリング

swagger generate clientで生成されるコードにエラーレスポンスの型情報があるので、型アサーションしてあげると取れる。例えば500だと[...]InternalServerErrorがそれにあたる。

rep, err := api.Application.Get(params)
if reterr, ok := err.(*application.GetInternalServerError); ok {
  return fmt.Erorf("internal server error: %v[%s]", err, reterr.XHogefuga)
}
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