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view_model.go
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/
view_model.go
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package main
import (
"context"
"encoding/json"
"io"
"log"
"os"
"regexp"
"strconv"
"strings"
"time"
"github.com/aws/aws-sdk-go-v2/aws"
"github.com/aws/aws-sdk-go-v2/config"
"github.com/aws/aws-sdk-go-v2/feature/s3/manager"
"github.com/aws/aws-sdk-go-v2/service/s3"
)
const SAVE_PATH = "/tmp/s3_filer_go_84EB04C0"
type ViewModel struct {
Buckets []Node
Nodes []Node
FilteredNodes []Node
CurrentNode Node
Client *s3.Client
downloader *manager.Downloader
}
func NewViewModel() *ViewModel {
viewModel := new(ViewModel)
viewModel.Client = buildClient()
viewModel.downloader = buildDownloader(viewModel.Client)
viewModel.Buckets = GetAllBuckets(viewModel.Client)
node, err := viewModel.Load()
if err != nil {
node = viewModel.GetRootLikeNode()
}
viewModel.UpdateCurrentNode(node)
return viewModel
}
func buildClient() *s3.Client {
cfg, err := config.LoadDefaultConfig(context.TODO())
if err != nil {
log.Fatal(err)
}
return s3.NewFromConfig(cfg)
}
func GetAllBuckets(client *s3.Client) []Node {
result, err := client.ListBuckets(context.TODO(), &s3.ListBucketsInput{})
if err != nil {
log.Fatal(err)
}
var nodes []Node
for _, x := range result.Buckets {
node := Node{
Bucket: aws.ToString(x.Name),
Name: aws.ToString(x.Name),
Timestamp: x.CreationDate.Format(time.RFC3339),
}
nodes = append(nodes, node)
}
return nodes
}
func (self *ViewModel) GetRootLikeNode() Node {
return Node{Bucket: ""}
}
func (self *ViewModel) UpdateCurrentNode(node Node) []Node {
if node.IsRoot() {
self.Nodes = self.Buckets
} else if node.IsEdge() {
self.Nodes = self.fetchChildren(node)
} else {
return nil
}
self.FilteredNodes = self.Nodes
self.CurrentNode = node
return self.FilteredNodes
}
func (self *ViewModel) fetchChildren(node Node) []Node {
output, err := self.Client.ListObjectsV2(context.TODO(), &s3.ListObjectsV2Input{
Bucket: aws.String(node.Bucket),
Delimiter: aws.String("/"),
Prefix: aws.String(node.Prefix),
})
if err != nil {
log.Fatal(err)
}
var nodes []Node
for _, x := range output.CommonPrefixes {
prefix := aws.ToString(x.Prefix)
node := Node{
Bucket: node.Bucket,
Name: strings.Replace(prefix, node.Prefix, "", 1),
Prefix: prefix,
Timestamp: " ", // dummy string to keep width
}
nodes = append(nodes, node)
}
for _, x := range output.Contents {
key := aws.ToString(x.Key)
node := Node{
Bucket: node.Bucket,
Name: strings.Replace(key, node.Prefix, "", 1),
Prefix: node.Prefix,
Timestamp: x.LastModified.Format(time.RFC3339),
Size: strconv.FormatInt(x.Size, 10),
StorageClass: string(x.StorageClass),
}
nodes = append(nodes, node)
}
return nodes
}
func (self *ViewModel) GetParent() Node {
return self.CurrentNode.GetParent()
}
func (self *ViewModel) Filter(text string) []Node {
if text == "" {
self.FilteredNodes = self.Nodes
} else {
searchReg := strings.Join(strings.Split(text, ""), "+")
r := regexp.MustCompile(searchReg)
var newNodes []Node
for _, x := range self.Nodes {
if r.MatchString(x.Name) {
newNodes = append(newNodes, x)
}
}
self.FilteredNodes = newNodes
}
return self.FilteredNodes
}
func buildDownloader(client *s3.Client) *manager.Downloader {
return manager.NewDownloader(client)
}
func (self *ViewModel) Download(node Node) error {
f, err := os.Create(node.Name)
if err != nil {
return err
}
defer f.Close()
_, err = self.downloader.Download(context.Background(), f, &s3.GetObjectInput{
Bucket: aws.String(node.Bucket),
Key: aws.String(node.Prefix + node.Name),
})
return err
}
func (self *ViewModel) FetchFirst(node Node) (string, error) {
buf, err := self.GetObjectFromS3(node, "bytes=0-500")
if err != nil {
return string(buf), err
}
ftype, err := GuessFileType(buf)
if err != nil {
return ftype, err
}
switch {
case strings.Contains(ftype, "ASCII text"):
return string(buf), nil
case strings.Contains(ftype, "gzip"):
return ReadGzip(buf)
case strings.Contains(ftype, "Apache Parquet"):
buf2, err := self.GetObjectFromS3(node, "")
if err != nil {
return "", err
}
return ReadParquet(buf2)
default:
return "Binary file not shown", nil
}
return string(buf), nil
}
func (self *ViewModel) GetObjectFromS3(node Node, byteRange string) ([]byte, error) {
input := s3.GetObjectInput{
Bucket: aws.String(node.Bucket),
Key: aws.String(node.Prefix + node.Name),
}
if byteRange != "" {
input.Range = aws.String(byteRange)
}
resp, err := self.Client.GetObject(context.TODO(), &input)
if err != nil {
Debug("GetObject err", err)
return []byte{}, err
}
defer resp.Body.Close()
buf, err := io.ReadAll(resp.Body)
if err != nil {
Debug("GetObject ReadAll err", err)
return []byte{}, err
}
return buf, nil
}
func (self *ViewModel) Save() error {
json, err := json.Marshal(self.CurrentNode)
if err != nil {
return err
}
err = os.WriteFile(SAVE_PATH, json, 0644)
return err
}
func (self *ViewModel) Load() (Node, error) {
var node Node
raw, err := os.ReadFile(SAVE_PATH)
if err != nil {
return node, err
}
err = json.Unmarshal(raw, &node)
if err != nil {
return node, err
}
return node, nil
}