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middleware.go
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middleware.go
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package middleware
import (
"context"
"encoding/json"
"fmt"
"log"
"net/http"
"github.com/gorilla/mux"
"github.com/lunarwhite/todo-app/server/models"
"go.mongodb.org/mongo-driver/bson"
"go.mongodb.org/mongo-driver/bson/primitive"
"go.mongodb.org/mongo-driver/mongo"
"go.mongodb.org/mongo-driver/mongo/options"
)
const connectionString = "mongodb://localhost:27017" // for localhost
const dbName = "test" // database name
const collName = "todolist" // collection name
var collection *mongo.Collection // collection object/instance
// create connection with mongo db
func init() {
clientOptions := options.Client().ApplyURI(connectionString) // set client options
client, err := mongo.Connect(context.TODO(), clientOptions) // connect to MongoDB
if err != nil {
log.Fatal(err)
}
err = client.Ping(context.TODO(), nil) // check the connection
if err != nil {
log.Fatal(err)
}
fmt.Println("Connected to MongoDB!")
collection = client.Database(dbName).Collection(collName)
fmt.Println("Collection instance created!")
}
// get all the task route
func GetAllTask(w http.ResponseWriter, r *http.Request) {
w.Header().Set("Context-Type", "application/x-www-form-urlencoded")
w.Header().Set("Access-Control-Allow-Origin", "*")
payload := getAllTask()
json.NewEncoder(w).Encode(payload)
}
// create task route
func CreateTask(w http.ResponseWriter, r *http.Request) {
w.Header().Set("Context-Type", "application/x-www-form-urlencoded")
w.Header().Set("Access-Control-Allow-Origin", "*")
w.Header().Set("Access-Control-Allow-Methods", "POST")
w.Header().Set("Access-Control-Allow-Headers", "Content-Type")
var task models.ToDoList
_ = json.NewDecoder(r.Body).Decode(&task)
insertOneTask(task)
json.NewEncoder(w).Encode(task)
}
// update task route
func TaskComplete(w http.ResponseWriter, r *http.Request) {
w.Header().Set("Content-Type", "application/x-www-form-urlencoded")
w.Header().Set("Access-Control-Allow-Origin", "*")
w.Header().Set("Access-Control-Allow-Methods", "PUT")
w.Header().Set("Access-Control-Allow-Headers", "Content-Type")
params := mux.Vars(r)
taskComplete(params["id"])
json.NewEncoder(w).Encode(params["id"])
}
// undo the complete task route
func UndoTask(w http.ResponseWriter, r *http.Request) {
w.Header().Set("Content-Type", "application/x-www-form-urlencoded")
w.Header().Set("Access-Control-Allow-Origin", "*")
w.Header().Set("Access-Control-Allow-Methods", "PUT")
w.Header().Set("Access-Control-Allow-Headers", "Content-Type")
params := mux.Vars(r)
undoTask(params["id"])
json.NewEncoder(w).Encode(params["id"])
}
// delete one task route
func DeleteTask(w http.ResponseWriter, r *http.Request) {
w.Header().Set("Context-Type", "application/x-www-form-urlencoded")
w.Header().Set("Access-Control-Allow-Origin", "*")
w.Header().Set("Access-Control-Allow-Methods", "DELETE")
w.Header().Set("Access-Control-Allow-Headers", "Content-Type")
params := mux.Vars(r)
deleteOneTask(params["id"])
json.NewEncoder(w).Encode(params["id"])
// json.NewEncoder(w).Encode("Task not found")
}
// delete all tasks route
func DeleteAllTask(w http.ResponseWriter, r *http.Request) {
w.Header().Set("Context-Type", "application/x-www-form-urlencoded")
w.Header().Set("Access-Control-Allow-Origin", "*")
count := deleteAllTask()
json.NewEncoder(w).Encode(count)
// json.NewEncoder(w).Encode("Task not found")
}
// get all task from the DB and return it
func getAllTask() []primitive.M {
cur, err := collection.Find(context.Background(), bson.D{{}})
if err != nil {
log.Fatal(err)
}
var results []primitive.M
for cur.Next(context.Background()) {
var result bson.M
e := cur.Decode(&result)
if e != nil {
log.Fatal(e)
}
// fmt.Println("cur..>", cur, "result", reflect.TypeOf(result), reflect.TypeOf(result["_id"]))
results = append(results, result)
}
if err := cur.Err(); err != nil {
log.Fatal(err)
}
cur.Close(context.Background())
return results
}
// one task in the DB
func insertOneTask(task models.ToDoList) {
insertResult, err := collection.InsertOne(context.Background(), task)
if err != nil {
log.Fatal(err)
}
fmt.Println("Inserted a Single Record ", insertResult.InsertedID)
}
// task complete method, update task's status to true
func taskComplete(task string) {
fmt.Println(task)
id, _ := primitive.ObjectIDFromHex(task)
filter := bson.M{"_id": id}
update := bson.M{"$set": bson.M{"status": true}}
result, err := collection.UpdateOne(context.Background(), filter, update)
if err != nil {
log.Fatal(err)
}
fmt.Println("modified count: ", result.ModifiedCount)
}
// task undo method, update task's status to false
func undoTask(task string) {
fmt.Println(task)
id, _ := primitive.ObjectIDFromHex(task)
filter := bson.M{"_id": id}
update := bson.M{"$set": bson.M{"status": false}}
result, err := collection.UpdateOne(context.Background(), filter, update)
if err != nil {
log.Fatal(err)
}
fmt.Println("modified count: ", result.ModifiedCount)
}
// delete one task from the DB, delete by ID
func deleteOneTask(task string) {
fmt.Println(task)
id, _ := primitive.ObjectIDFromHex(task)
filter := bson.M{"_id": id}
d, err := collection.DeleteOne(context.Background(), filter)
if err != nil {
log.Fatal(err)
}
fmt.Println("Deleted Document", d.DeletedCount)
}
// delete all the tasks from the DB
func deleteAllTask() int64 {
d, err := collection.DeleteMany(context.Background(), bson.D{{}}, nil)
if err != nil {
log.Fatal(err)
}
fmt.Println("Deleted Document", d.DeletedCount)
return d.DeletedCount
}