421 lines
13 KiB
Go
421 lines
13 KiB
Go
package main
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import (
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"database/sql"
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"errors"
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library "git.ailur.dev/ailur/fg-library"
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"path/filepath"
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"io"
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"os"
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"time"
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"github.com/go-playground/validator/v10"
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"github.com/google/uuid"
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)
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type InsertFile struct {
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File File `validate:"required"`
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Stream io.Reader `validate:"required"`
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}
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type ReadFile struct {
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File File `validate:"required"`
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Stream io.Writer `validate:"required"`
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}
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type File struct {
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Name string `validate:"required"`
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Size int64 `validate:"required"`
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User uuid.UUID `validate:"required"`
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}
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var ServiceInformation = library.Service{
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Name: "Storage",
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Permissions: library.Permissions{
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Authenticate: false, // This service does not require authentication
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Database: true, // This service requires database access to store quotas
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BlobStorage: false, // This service *is* the blob storage
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InterServiceCommunication: true, // This service does require inter-service communication
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},
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ServiceID: uuid.MustParse("00000000-0000-0000-0000-000000000003"),
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}
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var conn *sql.DB
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func getQuota(user uuid.UUID, information library.ServiceInitializationInformation) (int64, error) {
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// Get the user's quota from the database
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var quota int64
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err := conn.QueryRow("SELECT quota FROM quotas WHERE id = $1", user).Scan("a)
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if err != nil {
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if errors.Is(err, sql.ErrNoRows) {
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// The user has no quota set, so we'll set it to the default quota
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_, err = conn.Exec("INSERT INTO quotas (id, quota) VALUES ($1, $2)", user, int64(information.Configuration["defaultQuota"].(float64)))
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if err != nil {
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return 0, err
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}
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return int64(information.Configuration["defaultQuota"].(float64)), nil
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}
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return 0, err
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}
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return quota, nil
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}
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func getUsed(user uuid.UUID, information library.ServiceInitializationInformation) (int64, error) {
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// Check the user's used space via the filesystem
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var used int64
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_, err := os.Stat(filepath.Join(information.Configuration["path"].(string), user.String()))
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if err != nil {
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if os.IsNotExist(err) {
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// The user has no files stored, so we'll set it to 0
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return 0, nil
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}
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return 0, err
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} else {
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err := filepath.Walk(filepath.Join(information.Configuration["path"].(string), user.String()), func(path string, info os.FileInfo, err error) error {
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if err != nil {
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return err
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}
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used += info.Size()
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return nil
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})
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if err != nil {
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return 0, err
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}
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return used, nil
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}
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}
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func logFunc(message string, messageType uint64, information library.ServiceInitializationInformation) {
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// Log the error message to the logger service
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information.Outbox <- library.InterServiceMessage{
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ServiceID: ServiceInformation.ServiceID,
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ForServiceID: uuid.MustParse("00000000-0000-0000-0000-000000000002"), // Logger service
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MessageType: messageType,
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SentAt: time.Now(),
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Message: message,
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}
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}
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func storeFile(file InsertFile, serviceID uuid.UUID, information library.ServiceInitializationInformation) {
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// Create a folder for the user if it doesn't exist
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err := os.MkdirAll(filepath.Join(information.Configuration["path"].(string), file.File.User.String()), 0755)
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if err != nil {
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// First contact the logger service
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logFunc(err.Error(), 2, information)
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// Then send the error message to the requesting service
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information.Outbox <- library.InterServiceMessage{
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ServiceID: ServiceInformation.ServiceID,
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ForServiceID: serviceID,
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MessageType: 1, // An error that's not your fault
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SentAt: time.Now(),
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Message: err.Error(),
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}
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}
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// Check if the user has enough space to store the file
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quota, err := getQuota(file.File.User, information)
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if err != nil {
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// First contact the logger service
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logFunc(err.Error(), 2, information)
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// Then send the error message to the requesting service
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information.Outbox <- library.InterServiceMessage{
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ServiceID: ServiceInformation.ServiceID,
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ForServiceID: serviceID,
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MessageType: 1, // An error that's not your fault
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SentAt: time.Now(),
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Message: err.Error(),
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}
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}
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used, err := getUsed(file.File.User, information)
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if err != nil {
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// First contact the logger service
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logFunc(err.Error(), 2, information)
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// Then send the error message to the requesting service
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information.Outbox <- library.InterServiceMessage{
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ServiceID: ServiceInformation.ServiceID,
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ForServiceID: serviceID,
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MessageType: 1, // An error that's not your fault
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SentAt: time.Now(),
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Message: err.Error(),
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}
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}
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// Check if the user has enough space to store the file
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if used+file.File.Size > quota {
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// Then send the error message to the requesting service
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information.Outbox <- library.InterServiceMessage{
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ServiceID: ServiceInformation.ServiceID,
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ForServiceID: serviceID,
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MessageType: 3, // It's the user's fault (never say that to the customer ;P)
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SentAt: time.Now(),
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Message: "User has exceeded their quota",
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}
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}
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// Create a folder within that for the service if it doesn't exist
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err = os.MkdirAll(filepath.Join(information.Configuration["path"].(string), file.File.User.String(), serviceID.String()), 0755)
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if err != nil {
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// First contact the logger service
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logFunc(err.Error(), 2, information)
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// Then send the error message to the requesting service
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information.Outbox <- library.InterServiceMessage{
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ServiceID: ServiceInformation.ServiceID,
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ForServiceID: serviceID,
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MessageType: 1, // An error that's not your fault
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SentAt: time.Now(),
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Message: err.Error(),
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}
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}
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// Store the file
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fileStream, err := os.OpenFile(filepath.Join(information.Configuration["path"].(string), file.File.User.String(), serviceID.String(), file.File.Name), os.O_CREATE|os.O_WRONLY|os.O_TRUNC, 0644)
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if err != nil {
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// First contact the logger service
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logFunc(err.Error(), 2, information)
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// Then send the error message to the requesting service
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information.Outbox <- library.InterServiceMessage{
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ServiceID: ServiceInformation.ServiceID,
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ForServiceID: serviceID,
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MessageType: 1, // An error that's not your fault
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SentAt: time.Now(),
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Message: err.Error(),
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}
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}
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// Write the file
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_, err = io.Copy(fileStream, file.Stream)
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if err != nil {
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// First contact the logger service
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logFunc(err.Error(), 2, information)
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// Then send the error message to the requesting service
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information.Outbox <- library.InterServiceMessage{
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ServiceID: ServiceInformation.ServiceID,
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ForServiceID: serviceID,
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MessageType: 1, // An error that's not your fault
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SentAt: time.Now(),
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Message: err.Error(),
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}
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}
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// Close the file
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err = fileStream.Close()
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if err != nil {
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// First contact the logger service
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logFunc(err.Error(), 2, information)
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// Then send the error message to the requesting service
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information.Outbox <- library.InterServiceMessage{
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ServiceID: ServiceInformation.ServiceID,
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ForServiceID: serviceID,
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MessageType: 1, // An error that's not your fault
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SentAt: time.Now(),
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Message: err.Error(),
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}
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}
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// Report success
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information.Outbox <- library.InterServiceMessage{
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ServiceID: ServiceInformation.ServiceID,
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ForServiceID: serviceID,
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MessageType: 0, // Success
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SentAt: time.Now(),
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Message: nil,
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}
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}
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func readFile(file ReadFile, serviceID uuid.UUID, information library.ServiceInitializationInformation) {
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// Open the file
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fileStream, err := os.Open(filepath.Join(information.Configuration["path"].(string), file.File.User.String(), serviceID.String(), file.File.Name))
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if err != nil {
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// First contact the logger service
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logFunc(err.Error(), 2, information)
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// Then send the error message to the requesting service
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information.Outbox <- library.InterServiceMessage{
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ServiceID: ServiceInformation.ServiceID,
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ForServiceID: serviceID,
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MessageType: 1, // An error that's not your fault
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SentAt: time.Now(),
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Message: err.Error(),
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}
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}
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// Read the file
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_, err = io.Copy(file.Stream, fileStream)
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if err != nil {
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// First contact the logger service
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logFunc(err.Error(), 2, information)
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// Then send the error message to the requesting service
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information.Outbox <- library.InterServiceMessage{
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ServiceID: ServiceInformation.ServiceID,
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ForServiceID: serviceID,
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MessageType: 1, // An error that's not your fault
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SentAt: time.Now(),
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Message: err.Error(),
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}
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}
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// Close the file
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err = fileStream.Close()
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if err != nil {
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// First contact the logger service
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logFunc(err.Error(), 2, information)
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// Then send the error message to the requesting service
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information.Outbox <- library.InterServiceMessage{
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ServiceID: ServiceInformation.ServiceID,
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ForServiceID: serviceID,
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MessageType: 1, // An error that's not your fault
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SentAt: time.Now(),
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Message: err.Error(),
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}
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}
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// Report success
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information.Outbox <- library.InterServiceMessage{
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ServiceID: ServiceInformation.ServiceID,
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ForServiceID: serviceID,
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MessageType: 0, // Success
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SentAt: time.Now(),
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Message: nil,
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}
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}
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func removeFile(file File, serviceID uuid.UUID, information library.ServiceInitializationInformation) {
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// Remove the file
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err := os.Remove(filepath.Join(information.Configuration["path"].(string), file.User.String(), serviceID.String(), file.Name))
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if err != nil {
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// First contact the logger service
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logFunc(err.Error(), 2, information)
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// Then send the error message to the requesting service
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information.Outbox <- library.InterServiceMessage{
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ServiceID: ServiceInformation.ServiceID,
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ForServiceID: serviceID,
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MessageType: 1, // An error that's not your fault
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SentAt: time.Now(),
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Message: err.Error(),
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}
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}
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// Report success
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information.Outbox <- library.InterServiceMessage{
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ServiceID: ServiceInformation.ServiceID,
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ForServiceID: serviceID,
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MessageType: 0, // Success
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SentAt: time.Now(),
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Message: nil,
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}
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}
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func Main(information library.ServiceInitializationInformation) {
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go func() {
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for {
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message := <-information.Inbox
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if message.ServiceID == uuid.MustParse("00000000-0000-0000-0000-000000000001") {
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if message.MessageType == 1 {
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// We've received an error message. This should never happen.
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logFunc("Bit flip error: Error given to non-errored service. Move away from radiation or use ECC memory.", 3, information)
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}
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} else {
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switch message.MessageType {
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case 0:
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// Insert file
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validate := validator.New()
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err := validate.Struct(message.Message.(InsertFile))
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if err != nil {
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information.Outbox <- library.InterServiceMessage{
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ServiceID: ServiceInformation.ServiceID,
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ForServiceID: message.ServiceID,
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MessageType: 2, // An error that's your fault
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SentAt: time.Now(),
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Message: err.Error(),
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}
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} else {
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// Store file
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storeFile(message.Message.(InsertFile), message.ServiceID, information)
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}
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case 1:
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// Read file
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validate := validator.New()
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err := validate.Struct(message.Message.(ReadFile))
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if err != nil {
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information.Outbox <- library.InterServiceMessage{
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ServiceID: ServiceInformation.ServiceID,
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ForServiceID: message.ServiceID,
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MessageType: 2, // An error that's your fault
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SentAt: time.Now(),
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Message: err.Error(),
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}
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} else {
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// Read file
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readFile(message.Message.(ReadFile), message.ServiceID, information)
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}
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case 2:
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// Remove file
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validate := validator.New()
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err := validate.Struct(message.Message.(File))
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if err != nil {
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information.Outbox <- library.InterServiceMessage{
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ServiceID: ServiceInformation.ServiceID,
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ForServiceID: message.ServiceID,
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MessageType: 2, // An error that's your fault
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SentAt: time.Now(),
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Message: err.Error(),
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}
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} else {
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// Remove file
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removeFile(message.Message.(File), message.ServiceID, information)
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}
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}
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}
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}
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}()
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// Initiate a connection to the database
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// Call service ID 1 to get the database connection information
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information.Outbox <- library.InterServiceMessage{
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ServiceID: ServiceInformation.ServiceID,
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ForServiceID: uuid.MustParse("00000000-0000-0000-0000-000000000001"), // Service initialization service
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MessageType: 1, // Request connection information
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SentAt: time.Now(),
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Message: nil,
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}
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// Wait for the response
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response := <-information.Inbox
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if response.MessageType == 2 {
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// This is the connection information
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// Set up the database connection
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conn = response.Message.(*sql.DB)
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// Create the quotas table if it doesn't exist
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_, err := conn.Exec("CREATE TABLE IF NOT EXISTS quotas (id UUID PRIMARY KEY, quota BIGINT)")
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if err != nil {
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logFunc(err.Error(), 3, information)
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}
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} else {
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// This is an error message
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// Log the error message to the logger service
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logFunc(response.Message.(error).Error(), 3, information)
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}
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// Report a successful activation
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information.Outbox <- library.InterServiceMessage{
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ServiceID: ServiceInformation.ServiceID,
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ForServiceID: uuid.MustParse("00000000-0000-0000-0000-000000000001"), // Activation service
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MessageType: 0,
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SentAt: time.Now(),
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Message: true,
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}
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}
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