Merge pull request #21 from thanhliem89dn/master

Create basic example follow http://graphql.org/docs/getting-started/

examples/http/data.json

@@ -0,0 +1,14 @@
+{
+  "1": {
+    "id": "1",
+    "name": "Dan"
+  },
+  "2": {
+    "id": "2",
+    "name": "Lee"
+  },
+  "3": {
+    "id": "3",
+    "name": "Nick"
+  }
+}

examples/http/main.go

@@ -0,0 +1,119 @@
+package main
+
+import (
+	"encoding/json"
+	"fmt"
+	"io/ioutil"
+	"net/http"
+
+	"github.com/chris-ramon/graphql-go"
+	"github.com/chris-ramon/graphql-go/types"
+)
+
+type User struct {
+	Id   string `json:"id"`
+	Name string `json:"name"`
+}
+
+var data map[string]User
+
+/*
+   Create User object type with fields "id" and "name" by using GraphQLObjectTypeConfig:
+       - Name: name of object type
+       - Fields: a map of fields by using GraphQLFieldConfigMap
+   Setup type of field use GraphQLFieldConfig
+*/
+var userType = types.NewGraphQLObjectType(
+	types.GraphQLObjectTypeConfig{
+		Name: "User",
+		Fields: types.GraphQLFieldConfigMap{
+			"id": &types.GraphQLFieldConfig{
+				Type: types.GraphQLString,
+			},
+			"name": &types.GraphQLFieldConfig{
+				Type: types.GraphQLString,
+			},
+		},
+	},
+)
+
+/*
+   Create Query object type with fields "user" has type [userType] by using GraphQLObjectTypeConfig:
+       - Name: name of object type
+       - Fields: a map of fields by using GraphQLFieldConfigMap
+   Setup type of field use GraphQLFieldConfig to define:
+       - Type: type of field
+       - Args: arguments to query with current field
+       - Resolve: function to query data using params from [Args] and return value with current type
+*/
+var queryType = types.NewGraphQLObjectType(
+	types.GraphQLObjectTypeConfig{
+		Name: "Query",
+		Fields: types.GraphQLFieldConfigMap{
+			"user": &types.GraphQLFieldConfig{
+				Type: userType,
+				Args: types.GraphQLFieldConfigArgumentMap{
+					"id": &types.GraphQLArgumentConfig{
+						Type: types.GraphQLString,
+					},
+				},
+				Resolve: func(p types.GQLFRParams) interface{} {
+					idQuery, isOK := p.Args["id"].(string)
+					if isOK {
+						return data[idQuery]
+					} else {
+						return nil
+					}
+				},
+			},
+		},
+	})
+
+var schema, _ = types.NewGraphQLSchema(
+	types.GraphQLSchemaConfig{
+		Query: queryType,
+	},
+)
+
+func executeQuery(query string, schema types.GraphQLSchema) *types.GraphQLResult {
+	graphqlParams := gql.GraphqlParams{
+		Schema:        schema,
+		RequestString: query,
+	}
+	resultChannel := make(chan *types.GraphQLResult)
+	go gql.Graphql(graphqlParams, resultChannel)
+	result := <-resultChannel
+	if len(result.Errors) > 0 {
+		fmt.Println("wrong result, unexpected errors: %v", result.Errors)
+	}
+	return result
+}
+
+func main() {
+	_ = importJsonDataFromFile("data.json", &data)
+
+	http.HandleFunc("/graphql", func(w http.ResponseWriter, r *http.Request) {
+		result := executeQuery(r.URL.Query()["query"][0], schema)
+		json.NewEncoder(w).Encode(result)
+	})
+
+	fmt.Println("Now server is running on port 8080")
+	fmt.Println("Test with Get      : curl -g \"http://localhost:8080/graphql?query={user(id:%221%22){name}}\"")
+	http.ListenAndServe(":8080", nil)
+}
+
+//Helper function to import json from file to map
+func importJsonDataFromFile(fileName string, result interface{}) (isOK bool) {
+	isOK = true
+	content, err := ioutil.ReadFile(fileName)
+	if err != nil {
+		fmt.Print("Error:", err)
+		isOK = false
+	}
+	err = json.Unmarshal(content, result)
+	if err != nil {
+		isOK = false
+		fmt.Print("Error:", err)
+	}
+	return
+}