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queue.go
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queue.go
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package storage
import (
"encoding/binary"
"errors"
"path"
"reflect"
"sync"
"syscall"
"unsafe"
"github.com/charlie1404/vqs/internal/o11y/logs"
)
type Queue struct {
meta *Meta
metaMutex sync.RWMutex // RLock can only be used for peek cases as of now
messages []byte
msgMutex sync.RWMutex // RLock can only be used for peek cases as of now
tags []byte
// inFlightMessages []byte // for now we will keep these in memory, later put on disk
// inFlightMutex sync.Mutex
// delayedMessages []byte // for now we will keep these in memory, later put on disk
// delayedMutex sync.Mutex
}
func getQueue(queueDirPath string) (*Queue, error) {
metaFile := path.Join(queueDirPath, "meta.dat")
dataFile := path.Join(queueDirPath, "data.dat")
// inFlightFile := path.Join(queueDirPath, "in_flight.dat")
// delayedFile := path.Join(queueDirPath, "delayed.dat")
var (
meta *Meta
messages *[]byte
tags *[]byte
err error
// inFlightMessages []byte
// delayedMessages []byte
)
if messages, err = getMessagesMmapedRegion(dataFile); err != nil {
return nil, err
}
if meta, tags, err = getMetaAndTagsRegion(metaFile); err != nil {
return nil, err
}
// if inFlightMessages, err = getMmapedRegion(inFlightFile); err != nil {
// return nil, err
// }
// if delayedMessages, err = getMmapedRegion(delayedFile); err != nil {
// return nil, err
// }
return &Queue{
meta: meta,
messages: *messages,
tags: *tags,
// inFlightMessages: make(map[string][]byte),
// delayedMessages: make(map[string][]byte),
}, nil
}
func NewQueue(queueName string) (*Queue, error) {
// we delete existing folder and create new one
queueDirPath := path.Join("data", queueName)
if err := createQueueFolderExists(queueDirPath); err != nil {
return nil, err
}
if err := createQueueDataFilesExists(queueDirPath); err != nil {
return nil, err
}
return getQueue(queueDirPath)
}
func (q *Queue) Push(msg *Message) error {
q.msgMutex.Lock()
defer q.msgMutex.Unlock()
data, n, _ := serializeMessage(msg)
capacityLeft := q.meta.CapacityLeft
nextOffset := q.meta.WriteOffset + uint32(n) + 4
if capacityLeft < uint32(len(data)) {
return errors.New("queue is full")
}
binary.LittleEndian.PutUint32(q.messages[q.meta.WriteOffset:], uint32(len(data)))
copy(q.messages[q.meta.WriteOffset+4:], data)
q.meta.Count++
q.meta.CapacityLeft = capacityLeft - uint32(n) - 4
q.meta.WriteOffset = nextOffset % DATA_BUFFER_SIZE
// if nextOffset > DATA_BUFFER_SIZE {
// q.meta.WriteOffset = nextOffset % DATA_BUFFER_SIZE
// } else {
// q.meta.WriteOffset = nextOffset
// }
return nil
}
func (q *Queue) Pop() (*Message, error) {
q.msgMutex.Lock()
defer q.msgMutex.Unlock()
if q.meta.Count == 0 {
return nil, nil
}
messageSize := binary.LittleEndian.Uint32(q.messages[q.meta.ReadOffset:])
nextOffset := q.meta.ReadOffset + messageSize + 4
msg, err := deserializeMessage(q.messages[q.meta.ReadOffset+4 : nextOffset])
if err != nil {
logs.Logger.Error().Err(err).Msg("error deserializing message")
return nil, err
}
q.meta.Count--
q.meta.CapacityLeft = q.meta.CapacityLeft + messageSize + 4
q.meta.ReadOffset = nextOffset % DATA_BUFFER_SIZE
// if nextOffset > DATA_BUFFER_SIZE {
// q.meta.ReadOffset = nextOffset % DATA_BUFFER_SIZE
// } else {
// q.meta.ReadOffset = nextOffset
// }
return msg, nil
}
func (q *Queue) closeMmap() {
dh := (*reflect.SliceHeader)(unsafe.Pointer(&q.messages))
_, _, err := syscall.Syscall(syscall.SYS_MUNMAP, uintptr(dh.Data), uintptr(dh.Len), 0)
if err != syscall.Errno(0) {
logs.Logger.Warn().Err(err).Msg("error closing data mmap")
}
meta := (*reflect.SliceHeader)(unsafe.Pointer(unsafe.Pointer(&q.meta)))
_, _, err = syscall.Syscall(syscall.SYS_MUNMAP, uintptr(meta.Data), uintptr(META_FILE_SIZE), 0)
if err != syscall.Errno(0) {
logs.Logger.Warn().Err(err).Msg("error closing meta mmap")
}
}
// func (mm mmap) Sync() {
// rh := *(*reflect.SliceHeader)(unsafe.Pointer(&mm))
// _, _, err := syscall.Syscall(syscall.SYS_MSYNC, uintptr(rh.Data), uintptr(rh.Len), uintptr(syscall.MS_ASYNC))
// if err != 0 {
// panic(err)
// }