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db.go
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db.go
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package main
import (
"context"
"errors"
"log"
"github.com/aws/aws-sdk-go-v2/aws"
"github.com/aws/aws-sdk-go-v2/config"
"github.com/aws/aws-sdk-go-v2/feature/dynamodb/attributevalue"
"github.com/aws/aws-sdk-go-v2/feature/dynamodb/expression"
"github.com/aws/aws-sdk-go-v2/service/dynamodb"
"github.com/aws/aws-sdk-go-v2/service/dynamodb/types"
"github.com/aws/smithy-go"
"github.com/google/uuid"
)
const TableName = "Fatawa"
//var fatwa routes.CreateFatwa
var db dynamodb.Client
func init() {
sdkConfig, err := config.LoadDefaultConfig(context.TODO())
if err != nil {
log.Fatal(err)
}
db = *dynamodb.NewFromConfig(sdkConfig)
}
type Fatwa struct {
Id string `json:"id" dynamodbav:"id"`
Title string `json:"title" dynamodbav:"title"`
Question string `json:"question" dynamodbav:"question"`
Answer string `json:"answer" dynamodbav:"answer"`
Link string `json:"link" dynamodbav:"link"`
Author string `json:"author" dynamodbav:"author"`
Topic string `json:"topic" dynamodbav:"topic"`
Lang string `json:"lang" dynamodbav:"lang"`
// CreatedAt time.Time `json:"createdat" dynamodbav:"createdat"`
// UpdatedAt time.Time `json:"updatedat" dynamodbav:"updatedat"`
}
func GetItem(ctx context.Context, id string) (*Fatwa, error) {
key, err := attributevalue.Marshal(id)
if err != nil {
return nil, err
}
input := &dynamodb.GetItemInput{
TableName: aws.String(TableName),
Key: map[string]types.AttributeValue{
"id": key,
},
}
log.Printf("Calling Dynamodb with input: %v", input)
result, err := db.GetItem(ctx, input)
if err != nil {
return nil, err
}
log.Printf("Executed GetItem DynamoDb successfully. Result: %#v", result)
if result.Item == nil {
return nil, nil
}
fatwa := new(Fatwa)
err = attributevalue.UnmarshalMap(result.Item, fatwa)
if err != nil {
return nil, err
}
return fatwa, nil
}
func ListItems(ctx context.Context) ([]Fatwa, error) {
fatawa := make([]Fatwa, 0)
var token map[string]types.AttributeValue
for {
input := &dynamodb.ScanInput{
TableName: aws.String(TableName),
ExclusiveStartKey: token,
}
result, err := db.Scan(ctx, input)
if err != nil {
return nil, err
}
var fetchedFatawa []Fatwa
err = attributevalue.UnmarshalListOfMaps(result.Items, &fetchedFatawa)
if err != nil {
return nil, err
}
fatawa = append(fatawa, fetchedFatawa...)
token = result.LastEvaluatedKey
if token == nil {
break
}
}
return fatawa, nil
}
func InsertItem(ctx context.Context, createFatwa CreateFatwa) (*Fatwa, error) {
fatwa := Fatwa{
Id: uuid.NewString(),
Title: createFatwa.Title,
Question: createFatwa.Question,
Answer: createFatwa.Answer,
Link: createFatwa.Link,
Author: createFatwa.Author,
Topic: createFatwa.Topic,
Lang: createFatwa.Lang,
}
item, err := attributevalue.MarshalMap(fatwa)
if err != nil {
return nil, err
}
input := &dynamodb.PutItemInput{
TableName: aws.String(TableName),
Item: item,
}
res, err := db.PutItem(ctx, input)
if err != nil {
return nil, err
}
err = attributevalue.UnmarshalMap(res.Attributes, &fatwa)
if err != nil {
return nil, err
}
return &fatwa, nil
}
func DeleteItem(ctx context.Context, id string) (*Fatwa, error) {
key, err := attributevalue.Marshal(id)
if err != nil {
return nil, err
}
input := &dynamodb.DeleteItemInput{
TableName: aws.String(TableName),
Key: map[string]types.AttributeValue{
"id": key,
},
ReturnValues: types.ReturnValue(*aws.String("ALL_OLD")),
}
res, err := db.DeleteItem(ctx, input)
if err != nil {
return nil, err
}
if res.Attributes == nil {
return nil, nil
}
fatwa := new(Fatwa)
err = attributevalue.UnmarshalMap(res.Attributes, fatwa)
if err != nil {
return nil, err
}
return fatwa, nil
}
func UpdateItem(ctx context.Context, id string, updateFatwa UpdateFatwa) (*Fatwa, error) {
key, err := attributevalue.Marshal(id)
if err != nil {
return nil, err
}
expr, err := expression.NewBuilder().WithUpdate(
expression.Set(
expression.Name("title"),
expression.Value(updateFatwa.Title),
).Set(
expression.Name("question"),
expression.Value(updateFatwa.Question),
).Set(
expression.Name("answer"),
expression.Value(updateFatwa.Answer),
).Set(
expression.Name("link"),
expression.Value(updateFatwa.Link),
).Set(
expression.Name("author"),
expression.Value(updateFatwa.Author),
).Set(
expression.Name("topic"),
expression.Value(updateFatwa.Topic),
).Set(
expression.Name("lang"),
expression.Value(updateFatwa.Lang),
),
).WithCondition(
expression.Equal(
expression.Name("id"),
expression.Value(id),
),
).Build()
if err != nil {
return nil, err
}
input := &dynamodb.UpdateItemInput{
Key: map[string]types.AttributeValue{
"id": key,
},
TableName: aws.String(TableName),
UpdateExpression: expr.Update(),
ExpressionAttributeNames: expr.Names(),
ExpressionAttributeValues: expr.Values(),
ConditionExpression: expr.Condition(),
ReturnValues: types.ReturnValue(*aws.String("ALL_NEW")),
}
res, err := db.UpdateItem(ctx, input)
if err != nil {
var smErr *smithy.OperationError
if errors.As(err, &smErr) {
var condCheckFailed *types.ConditionalCheckFailedException
if errors.As(err, &condCheckFailed) {
return nil, nil
}
}
return nil, err
}
if res.Attributes == nil {
return nil, nil
}
fatwa := new(Fatwa)
err = attributevalue.UnmarshalMap(res.Attributes, fatwa)
if err != nil {
return nil, err
}
return fatwa, nil
}