How to connect Graphql with Golang
To use GraphQL with Go, you will need to use a GraphQL library that provides a set of functions and types for building a GraphQL server. One popular library for this purpose is "graphql-go", which you can install using the following command:
go get -u github.com/graphql-go/graphql
Here's a brief example of how you might use "graphql-go" to set up a GraphQL server in Go:
package main
import (
"encoding/json"
"fmt"
"log"
"net/http"
"github.com/graphql-go/graphql"
)
// Define a GraphQL type for a person
var personType = graphql.NewObject(graphql.ObjectConfig{
Name: "Person",
Fields: graphql.Fields{
"name": &graphql.Field{
Type: graphql.String,
},
"age": &graphql.Field{
Type: graphql.Int,
},
},
})
// Define a GraphQL query for a list of people
var queryType = graphql.NewObject(graphql.ObjectConfig{
Name: "Query",
Fields: graphql.Fields{
"people": &graphql.Field{
Type: graphql.NewList(personType),
Resolve: func(p graphql.ResolveParams) (interface{}, error) {
// Return a list of people
return []Person{
Person{Name: "Alice", Age: 25},
Person{Name: "Bob", Age: 30},
}, nil
},
},
},
})
// Define the GraphQL schema
var schema, _ = graphql.NewSchema(graphql.SchemaConfig{
Query: queryType,
})
func main() {
http.HandleFunc("/graphql", func(w http.ResponseWriter, r *http.Request) {
// Parse the GraphQL query
query, err := graphql.Parse(r.URL.Query().Get("query"))
if err != nil {
http.Error(w, err.Error(), http.StatusBadRequest)
return
}
// Execute the query and get the result
result := graphql.Do(graphql.Params{
Schema: schema,
RequestString: query,
})
// Marshal the result as JSON and write it to the response
json.NewEncoder(w).Encode(result)
})
log.Fatal(http.ListenAndServe(":8080", nil))
}
This example defines a GraphQL schema with a single type Person and a query for a list of people. It then sets up an HTTP server that listens for GraphQL requests and executes the queries using the defined schema.
I hope this helps! Let me know if you have any questions.
