A few days ago I have to look at consuming API with GO from Ghost so here is what I learnt.
A very simple example of how to consume API and print it as text to console. It’s not much but it’s good to start.
package main
import (
"fmt"
"io/ioutil"
"log"
"net/http"
"os"
)
func main() {
var endpoint = "http://your-addres.domain/api/endpoint"
response, err := http.Get(endpoint)
if err != nil {
fmt.Print(err.Error())
os.Exit(1)
}
responseData, err := ioutil.ReadAll(response.Body)
if err != nil {
log.Fatal(err)
}
fmt.Println(string(responseData))
}
Next, it will be good if I can return objects to use in my app instead of text. And go has to function for it called unmarshall. Unmarshalling JSON response need JSON module so I have to import "encoding/json".
Another thing I need was struct in which will be my json respone parsed. Following syntax is example for Ghost API for posts.
type Response struct {
Posts []Post `json: "posts"`
}
type Post struct {
Id string `json: "id"`
Title string `json: "title"`
Slug string `json: "slug"`
Excerpt string `json: "excerpt"`
Html string `json: "html"`
}
and define new variable in main function var responseObject Response
next i add unmarshall after response which will parse json string to my object syntax for it is as follows:
json.Unmarshal(responseData, &responseObject)
Now you can go trough array of object.
for _, post := range responseObject.Posts {
fmt.Println("Id:", post.Id, "with title:", post.Title, "slug:", post.Slug)
}
Complete example is here:
package main
import (
"encoding/json"
"fmt"
"io/ioutil"
"log"
"net/http"
"os"
)
type Response struct {
Posts []Post `json: "posts"`
}
type Post struct {
Id string `json: "id"`
Title string `json: "title"`
Slug string `json: "slug"`
Excerpt string `json: "excerpt"`
Html string `json: "html"`
}
func main() {
var endpoint = "http://your-addres.domain/api/endpoint"
var responseObject Response
response, err := http.Get(endpoint)
if err != nil {
fmt.Print(err.Error())
os.Exit(1)
}
responseData, err := ioutil.ReadAll(response.Body)
if err != nil {
log.Fatal(err)
}
// fmt.Println(string(responseData))
json.Unmarshal(responseData, &responseObject)
for _, post := range responseObject.Posts {
fmt.Println("Id:", post.Id, "with title:", post.Title, "slug:", post.Slug)
}
}
Thank You for reading.
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