fastpastebin/internal/database/dialects/flatfiles/flatfiles.go

247 lines
7.5 KiB
Go

// Fast Paste Bin - uberfast and easy-to-use pastebin.
//
// Copyright (c) 2018, Stanislav N. aka pztrn and Fast Paste Bin
// developers.
//
// Permission is hereby granted, free of charge, to any person obtaining
// a copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to
// permit persons to whom the Software is furnished to do so, subject
// to the following conditions:
//
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
// IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
// CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
// TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE
// OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
package flatfiles
import (
// stdlib
"database/sql"
"encoding/json"
"io/ioutil"
"os"
"os/user"
"path/filepath"
"strconv"
"strings"
"sync"
// local
"go.dev.pztrn.name/fastpastebin/internal/structs"
)
type FlatFiles struct {
pastesIndex []*Index
path string
writeMutex sync.Mutex
}
func (ff *FlatFiles) GetDatabaseConnection() *sql.DB {
return nil
}
func (ff *FlatFiles) GetPaste(pasteID int) (*structs.Paste, error) {
ff.writeMutex.Lock()
pastePath := filepath.Join(ff.path, "pastes", strconv.Itoa(pasteID)+".json")
c.Logger.Debug().Msgf("Trying to load paste data from '%s'...", pastePath)
pasteInBytes, err := ioutil.ReadFile(pastePath)
if err != nil {
c.Logger.Debug().Msgf("Failed to read paste from storage: %s", err.Error())
return nil, err
}
c.Logger.Debug().Msgf("Loaded %d bytes: %s", len(pasteInBytes), string(pasteInBytes))
ff.writeMutex.Unlock()
paste := &structs.Paste{}
err = json.Unmarshal(pasteInBytes, paste)
if err != nil {
c.Logger.Error().Msgf("Failed to parse paste: %s", err.Error())
return nil, err
}
return paste, nil
}
func (ff *FlatFiles) GetPagedPastes(page int) ([]structs.Paste, error) {
// Pagination.
var startPagination = 0
if page > 1 {
startPagination = (page - 1) * c.Config.Pastes.Pagination
}
c.Logger.Debug().Msgf("Pastes index: %+v", ff.pastesIndex)
// Iteration one - get only public pastes.
var publicPastes []*Index
for _, paste := range ff.pastesIndex {
if !paste.Private {
publicPastes = append(publicPastes, paste)
}
}
c.Logger.Debug().Msgf("%+v", publicPastes)
// Iteration two - get paginated pastes.
var pastesData []structs.Paste
for idx, paste := range publicPastes {
if len(pastesData) == c.Config.Pastes.Pagination {
break
}
if idx < startPagination {
c.Logger.Debug().Msgf("Paste with index %d isn't in pagination query: too low index", idx)
continue
}
if (idx-1 >= startPagination && page > 1 && idx > startPagination+((page-1)*c.Config.Pastes.Pagination)) || (idx-1 >= startPagination && page == 1 && idx > startPagination+(page*c.Config.Pastes.Pagination)) {
c.Logger.Debug().Msgf("Paste with index %d isn't in pagination query: too high index", idx)
break
}
c.Logger.Debug().Msgf("Getting paste data (ID: %d, index: %d)", paste.ID, idx)
// Get paste data.
pasteData := &structs.Paste{}
pasteRawData, err := ioutil.ReadFile(filepath.Join(ff.path, "pastes", strconv.Itoa(paste.ID)+".json"))
if err != nil {
c.Logger.Error().Msgf("Failed to read paste data: %s", err.Error())
continue
}
err = json.Unmarshal(pasteRawData, pasteData)
if err != nil {
c.Logger.Error().Msgf("Failed to parse paste data: %s", err.Error())
continue
}
pastesData = append(pastesData, (*pasteData))
}
return pastesData, nil
}
func (ff *FlatFiles) GetPastesPages() int {
// Get public pastes count.
var publicPastes []*Index
ff.writeMutex.Lock()
for _, paste := range ff.pastesIndex {
if !paste.Private {
publicPastes = append(publicPastes, paste)
}
}
ff.writeMutex.Unlock()
// Calculate pages.
pages := len(publicPastes) / c.Config.Pastes.Pagination
// Check if we have any remainder. Add 1 to pages count if so.
if len(publicPastes)%c.Config.Pastes.Pagination > 0 {
pages++
}
return pages
}
func (ff *FlatFiles) Initialize() {
c.Logger.Info().Msg("Initializing flatfiles storage...")
path := c.Config.Database.Path
// Get proper paste file path.
if strings.Contains(c.Config.Database.Path, "~") {
curUser, err := user.Current()
if err != nil {
c.Logger.Error().Msg("Failed to get current user. Will replace '~' for '/' in storage path!")
path = strings.Replace(path, "~", "/", -1)
}
path = strings.Replace(path, "~", curUser.HomeDir, -1)
}
path, _ = filepath.Abs(path)
ff.path = path
c.Logger.Debug().Msgf("Storage path is now: %s", ff.path)
// Create directory if neccessary.
if _, err := os.Stat(ff.path); err != nil {
c.Logger.Debug().Msgf("Directory '%s' does not exist, creating...", ff.path)
os.MkdirAll(ff.path, os.ModePerm)
} else {
c.Logger.Debug().Msgf("Directory '%s' already exists", ff.path)
}
// Create directory for pastes.
if _, err := os.Stat(filepath.Join(ff.path, "pastes")); err != nil {
c.Logger.Debug().Msgf("Directory '%s' does not exist, creating...", filepath.Join(ff.path, "pastes"))
os.MkdirAll(filepath.Join(ff.path, "pastes"), os.ModePerm)
} else {
c.Logger.Debug().Msgf("Directory '%s' already exists", filepath.Join(ff.path, "pastes"))
}
// Load pastes index.
ff.pastesIndex = []*Index{}
if _, err := os.Stat(filepath.Join(ff.path, "pastes", "index.json")); err != nil {
c.Logger.Warn().Msg("Pastes index file does not exist, will create new one")
} else {
indexData, err := ioutil.ReadFile(filepath.Join(ff.path, "pastes", "index.json"))
if err != nil {
c.Logger.Fatal().Msg("Failed to read contents of index file!")
}
err = json.Unmarshal(indexData, &ff.pastesIndex)
if err != nil {
c.Logger.Error().Msgf("Failed to parse index file contents from JSON into internal structure. Will create new index file. All of your previous pastes will became unavailable. Error was: %s", err.Error())
}
c.Logger.Debug().Msgf("Parsed pastes index: %+v", ff.pastesIndex)
}
}
func (ff *FlatFiles) SavePaste(p *structs.Paste) (int64, error) {
ff.writeMutex.Lock()
// Write paste data on disk.
filesOnDisk, _ := ioutil.ReadDir(filepath.Join(ff.path, "pastes"))
pasteID := len(filesOnDisk) + 1
c.Logger.Debug().Msgf("Writing paste to disk, ID will be " + strconv.Itoa(pasteID))
p.ID = pasteID
data, err := json.Marshal(p)
if err != nil {
ff.writeMutex.Unlock()
return 0, err
}
err = ioutil.WriteFile(filepath.Join(ff.path, "pastes", strconv.Itoa(pasteID)+".json"), data, 0644)
if err != nil {
ff.writeMutex.Unlock()
return 0, err
}
// Add it to cache.
indexData := &Index{}
indexData.ID = pasteID
indexData.Private = p.Private
ff.pastesIndex = append(ff.pastesIndex, indexData)
ff.writeMutex.Unlock()
return int64(pasteID), nil
}
func (ff *FlatFiles) Shutdown() {
c.Logger.Info().Msg("Saving indexes...")
indexData, err := json.Marshal(ff.pastesIndex)
if err != nil {
c.Logger.Error().Msgf("Failed to encode index data into JSON: %s", err.Error())
return
}
err = ioutil.WriteFile(filepath.Join(ff.path, "pastes", "index.json"), indexData, 0644)
if err != nil {
c.Logger.Error().Msgf("Failed to write index data to file. Pretty sure that you've lost your pastes.")
return
}
}