examples: adds http-post example

examples/http-post/main.go

@@ -0,0 +1,76 @@
+package main
+
+import (
+	"encoding/json"
+	"fmt"
+	"net/http"
+
+	"github.com/graphql-go/graphql"
+	"github.com/graphql-go/graphql/examples/todo/schema"
+)
+
+type postData struct {
+	Query     string                 `json:"query"`
+	Operation string                 `json:"operation"`
+	Variables map[string]interface{} `json:"variables"`
+}
+
+func main() {
+	http.HandleFunc("/graphql", func(w http.ResponseWriter, req *http.Request) {
+		var p postData
+		if err := json.NewDecoder(req.Body).Decode(&p); err != nil {
+			w.WriteHeader(400)
+			return
+		}
+		result := graphql.Do(graphql.Params{
+			Context:        req.Context(),
+			Schema:         schema.TodoSchema,
+			RequestString:  p.Query,
+			VariableValues: p.Variables,
+			OperationName:  p.Operation,
+		})
+		if err := json.NewEncoder(w).Encode(result); err != nil {
+			fmt.Printf("could not write result to response: %s", err)
+		}
+	})
+
+	fmt.Println("Now server is running on port 8080")
+
+	fmt.Println("")
+
+	fmt.Println(`Get single todo:
+curl \
+-X POST \
+-H "Content-Type: application/json" \
+--data '{ "query": "{ todo(id:\"b\") { id text done } }" }' \
+http://localhost:8080/graphql`)
+
+	fmt.Println("")
+
+	fmt.Println(`Create new todo:
+curl \
+-X POST \
+-H "Content-Type: application/json" \
+--data '{ "query": "mutation { createTodo(text:\"My New todo\") { id text done } }" }' \
+http://localhost:8080/graphql`)
+
+	fmt.Println("")
+
+	fmt.Println(`Update todo:
+curl \
+-X POST \
+-H "Content-Type: application/json" \
+--data '{ "query": "mutation { updateTodo(id:\"a\", done: true) { id text done } }" }' \
+http://localhost:8080/graphql`)
+
+	fmt.Println("")
+
+	fmt.Println(`Load todo list:
+curl \
+-X POST \
+-H "Content-Type: application/json" \
+--data '{ "query": "{ todoList { id text done } }" }' \
+http://localhost:8080/graphql`)
+
+	http.ListenAndServe(":8080", nil)
+}