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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,3 +1,4 @@ | ||
| bin | ||
| redixdata* | ||
| .DS_STORE | ||
| data/ |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,53 @@ | ||
| package filesystem | ||
|
|
||
| import ( | ||
| "io/ioutil" | ||
| "os" | ||
| "syscall" | ||
| ) | ||
|
|
||
| // ReadFileWithSharedLock reads the specified file using a shared-lock | ||
| func ReadFileWithSharedLock(filename string) ([]byte, error) { | ||
| f, err := os.OpenFile(filename, os.O_RDONLY, 0775) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| defer f.Close() | ||
|
|
||
| fd := int(f.Fd()) | ||
|
|
||
| if err := syscall.Flock(fd, syscall.LOCK_SH); err != nil { | ||
| return nil, err | ||
| } | ||
| defer syscall.Flock(fd, syscall.LOCK_UN) | ||
|
|
||
| data, err := ioutil.ReadAll(f) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
|
|
||
| return data, nil | ||
| } | ||
|
|
||
| // WriteFileWithExclusiveLock reads the specified file using a shared-lock | ||
| func WriteFileWithExclusiveLock(filename string, data []byte) (int, error) { | ||
| f, err := os.OpenFile(filename, os.O_CREATE|os.O_RDWR|os.O_TRUNC|os.O_SYNC, 07775) | ||
| if err != nil { | ||
| return 0, err | ||
| } | ||
| defer f.Close() | ||
|
|
||
| fd := int(f.Fd()) | ||
|
|
||
| if err := syscall.Flock(fd, syscall.LOCK_EX); err != nil { | ||
| return 0, err | ||
| } | ||
| defer syscall.Flock(fd, syscall.LOCK_UN) | ||
|
|
||
| written, err := f.Write(data) | ||
| if err != nil { | ||
| return 0, err | ||
| } | ||
|
|
||
| return written, nil | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,185 @@ | ||
| package filesystem | ||
|
|
||
| import ( | ||
| "bytes" | ||
| "encoding/hex" | ||
| "fmt" | ||
| "io/fs" | ||
| "os" | ||
| "path/filepath" | ||
|
|
||
| "github.com/alash3al/redix/internals/datastore/contract" | ||
| ) | ||
|
|
||
| // Engine represents the contract.Engine implementation | ||
| type Engine struct { | ||
| storageDir string | ||
| kvDir string | ||
| } | ||
|
|
||
| // Open opens the database | ||
| func (e *Engine) Open(dir string) (err error) { | ||
| if err := os.MkdirAll(dir, 0775); err != nil && err != os.ErrExist { | ||
| return err | ||
| } | ||
|
|
||
| if err := os.MkdirAll(filepath.Join(dir, "/kv"), 0775); err != nil && err != os.ErrExist { | ||
| return err | ||
| } | ||
|
|
||
| absDir, err := filepath.Abs(dir) | ||
| if err != nil { | ||
| return err | ||
| } | ||
|
|
||
| e.storageDir = absDir | ||
| e.kvDir = filepath.Join(e.storageDir, "/kv") | ||
|
|
||
| return nil | ||
| } | ||
|
|
||
| // Write writes into the database | ||
| func (e *Engine) Write(input *contract.WriteInput) (*contract.WriteOutput, error) { | ||
| if input == nil { | ||
| return nil, fmt.Errorf("empty input specified") | ||
| } | ||
|
|
||
| if input.Append { | ||
| return nil, fmt.Errorf("(filesystem) unsupported feature (append)") | ||
| } | ||
|
|
||
| if input.Increment { | ||
| return nil, fmt.Errorf("(filesystem) unsupported feature (increment)") | ||
| } | ||
|
|
||
| if input.OnlyIfNotExists { | ||
| return nil, fmt.Errorf("(filesystem) unsupported feature (ifNotExists)") | ||
| } | ||
|
|
||
| if input.TTL > 0 { | ||
| return nil, fmt.Errorf("(filesystem) unsupported feature (TTL)") | ||
| } | ||
|
|
||
| if input.Key == nil { | ||
| if err := os.RemoveAll(e.kvDir); err != nil { | ||
| return nil, err | ||
| } | ||
|
|
||
| return nil, nil | ||
| } | ||
|
|
||
| key := hex.EncodeToString(input.Key) | ||
| keyDataPath := filepath.Join(e.kvDir, key) | ||
|
|
||
| if input.Value == nil { | ||
| if err := os.Remove(keyDataPath); err != nil { | ||
| return nil, err | ||
| } | ||
|
|
||
| return nil, nil | ||
| } | ||
|
|
||
| if err := os.MkdirAll(filepath.Join(e.kvDir, "/kv"), 0775); err != nil && err != os.ErrExist { | ||
| return nil, err | ||
| } | ||
|
|
||
| if _, err := WriteFileWithExclusiveLock(keyDataPath, input.Value); err != nil { | ||
| return nil, err | ||
| } | ||
|
|
||
| return &contract.WriteOutput{ | ||
| Value: input.Value, | ||
| }, nil | ||
| } | ||
|
|
||
| // Get reads from the database | ||
| func (e *Engine) Read(input *contract.ReadInput) (*contract.ReadOutput, error) { | ||
| if input == nil { | ||
| return nil, fmt.Errorf("empty input specified") | ||
| } | ||
|
|
||
| key := hex.EncodeToString(input.Key) | ||
| keyDataPath := filepath.Join(e.kvDir, key) | ||
|
|
||
| data, err := ReadFileWithSharedLock(keyDataPath) | ||
| if err != nil { | ||
| if err == os.ErrNotExist { | ||
| return &contract.ReadOutput{}, nil | ||
| } | ||
|
|
||
| return nil, err | ||
| } | ||
|
|
||
| if input.Delete { | ||
| return nil, filepath.WalkDir(e.kvDir, func(path string, d fs.DirEntry, err error) error { | ||
| if path == e.kvDir { | ||
| return nil | ||
| } | ||
|
|
||
| actualKey, err := hex.DecodeString(d.Name()) | ||
| if err != nil { | ||
| return err | ||
| } | ||
|
|
||
| if bytes.HasPrefix(actualKey, input.Key) { | ||
| if err := os.Remove(path); err != nil { | ||
| return err | ||
| } | ||
| } | ||
|
|
||
| return nil | ||
| }) | ||
| } | ||
|
|
||
| return &contract.ReadOutput{ | ||
| Key: input.Key, | ||
| Value: data, | ||
| Exists: true, | ||
| TTL: -1, | ||
| }, nil | ||
| } | ||
|
|
||
| // Iterate iterates on the whole database stops if the IteratorOpts returns an error | ||
| func (e *Engine) Iterate(opts *contract.IteratorOpts) error { | ||
| if opts == nil { | ||
| return fmt.Errorf("empty options specified") | ||
| } | ||
|
|
||
| if opts.Callback == nil { | ||
| return fmt.Errorf("you must specify the callback") | ||
| } | ||
|
|
||
| return filepath.WalkDir(e.kvDir, func(path string, d fs.DirEntry, err error) error { | ||
| if path == e.kvDir { | ||
| return nil | ||
| } | ||
|
|
||
| actualKey, err := hex.DecodeString(d.Name()) | ||
| if err != nil { | ||
| return err | ||
| } | ||
|
|
||
| if bytes.HasPrefix(actualKey, opts.Prefix) { | ||
| data, err := ReadFileWithSharedLock(path) | ||
| if err != nil { | ||
| return err | ||
| } | ||
|
|
||
| if err := opts.Callback(&contract.ReadOutput{ | ||
| Key: bytes.TrimPrefix(actualKey, opts.Prefix), | ||
| Value: data, | ||
| Exists: true, | ||
| TTL: -1, | ||
| }); err != nil { | ||
| return err | ||
| } | ||
| } | ||
|
|
||
| return nil | ||
| }) | ||
| } | ||
|
|
||
| // Close closes the connection | ||
| func (e *Engine) Close() error { | ||
| return nil | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,12 @@ | ||
| package filesystem | ||
|
|
||
| import "github.com/alash3al/redix/internals/datastore/contract" | ||
|
|
||
| // Global consts | ||
| const ( | ||
| Name = "filesystem" | ||
| ) | ||
|
|
||
| func init() { | ||
| contract.Register(Name, &Engine{}) | ||
| } |
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