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package main
import (
"bytes"
"encoding/json"
"errors"
"fmt"
"io/ioutil"
"net/http"
"os"
)
func jsonPrettyPrint(in []byte) string {
var out bytes.Buffer
err := json.Indent(&out, in, "", " ")
if err != nil {
return string(in)
}
return out.String()
}
var HASURA_GRAPHQL_ADDRESS = os.Getenv("HASURA_GRAPHQL_ADDRESS")
var HASURA_GRAPHQL_ADMIN_SECRET = os.Getenv("HASURA_GRAPHQL_ADMIN_SECRET")
type GraphqlQuery struct {
Data interface{}
}
var client = &http.Client{Transport: http.DefaultTransport}
func hasura(query string, variables interface{}, data interface{}) (err error) {
variablesBytes, err := json.Marshal(variables)
if err != nil {
return
}
v := string(variablesBytes)
requestBody := []byte(`{"query":"` + query + `","variables":` + v + `}`)
requestBytes := bytes.NewBuffer(requestBody)
req, err := http.NewRequest("POST", HASURA_GRAPHQL_ADDRESS, requestBytes)
if err != nil {
return
}
req.Header.Add("X-Hasura-Admin-Secret", HASURA_GRAPHQL_ADMIN_SECRET)
resp, err := client.Do(req)
if err != nil {
return
}
b, err := ioutil.ReadAll(resp.Body)
if err != nil {
return
}
// loggin the answer for debugging purposes
fmt.Println(jsonPrettyPrint(b))
if resp.StatusCode < 200 || resp.StatusCode > 299 {
return errors.New(http.StatusText(resp.StatusCode))
}
gqlQuery := GraphqlQuery{Data: data}
err = json.Unmarshal(b, &gqlQuery)
if err != nil {
return
}
return
}
type User struct {
GithubLogin string
}
const userQuery = `
query {
user {
githubLogin
}
}`
func getUsers() (users []User, err error) {
var data map[string][]User
err = hasura(userQuery, nil, &data)
return data["user"], err
}
func main() {
fmt.Println(getUsers())
}
// HASURA_GRAPHQL_ADMIN_SECRET=VERYVERYSECRET HASURA_GRAPHQL_ADDRESS=http://localhost/graphql-engine/v1alpha1/graphql go run call-graphql.go