Created
January 17, 2022 15:08
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Small Go program to read number of people in space from a webservice
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package main | |
import ( | |
"encoding/json" | |
"fmt" | |
"io" | |
"net/http" | |
) | |
type Astronaut struct { | |
Craft string `json:"craft"` | |
Name string `json:"name"` | |
} | |
type AstronautResponse struct { | |
People []Astronaut `json:"people"` | |
Message string `json:"message"` | |
Number int64 `json:"number"` | |
} | |
func main() { | |
fmt.Println("how many people are in space right now?") | |
resp, err := http.Get("http://api.open-notify.org/astros.json") | |
if err != nil { | |
fmt.Println("error retrieving url", err) | |
} | |
status := resp.StatusCode | |
fmt.Println("Response status code=", status) | |
// fmt.Println("response is ", resp) | |
body, err := io.ReadAll(resp.Body) | |
resp.Body.Close() | |
fmt.Println("Response body=\n", string(body[:]), "\n") | |
fmt.Println("length of returned byte array:", len(body)) | |
var response = new(AstronautResponse) | |
err2 := json.Unmarshal(body, &response) | |
if err2 != nil { | |
fmt.Println("Oops, error:", err2) | |
} else { | |
fmt.Println("Number:", response.Number) | |
fmt.Println("array length:", len(response.People)) | |
fmt.Println("First array elt:", response.People[1].Name) | |
} | |
} |
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