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Implement command pipelining, finish LIST ACTIVE command implementation

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This commit is contained in:
ChronosX88 2022-01-20 00:44:27 +03:00
parent 99a950181d
commit dda82b7916
Signed by: ChronosXYZ
GPG Key ID: 085A69A82C8C511A
8 changed files with 59 additions and 17 deletions
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2
README.md
View File

@ -14,7 +14,7 @@
#### Commands
- :heavy_check_mark: `CAPABILITIES`
- :heavy_check_mark: `DATE`
- :construction: `LIST`
- :heavy_check_mark: `LIST ACTIVE`
- :heavy_check_mark: `LIST NEWSGROUPS`
- :heavy_check_mark: `MODE READER`
- :heavy_check_mark: `QUIT`

7
internal/backend/sqlite/migrations/001_init_schema.sql
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@ -3,10 +3,11 @@
CREATE TABLE IF NOT EXISTS groups(
id INTEGER PRIMARY KEY AUTOINCREMENT,
group_name TEXT UNIQUE NOT NULL,
description TEXT
description TEXT,
created_at UNSIGNED BIG INT NOT NULL
);
CREATE TABLE IF NOT EXISTS articles(
id TEXT PRIMARY KEY,
id INTEGER PRIMARY KEY AUTOINCREMENT,
date INTEGER NOT NULL,
path TEXT,
reply_to TEXT,
@ -15,7 +16,7 @@ CREATE TABLE IF NOT EXISTS articles(
body TEXT NOT NULL
);
CREATE TABLE IF NOT EXISTS articles_to_groups(
article_id TEXT NOT NULL,
article_id INTEGER NOT NULL,
group_id INTEGER NOT NULL,
FOREIGN KEY (article_id) REFERENCES articles(id) ON DELETE CASCADE,
FOREIGN KEY (group_id) REFERENCES groups(id) ON DELETE CASCADE

12
internal/backend/sqlite/sqlite.go
View File

@ -43,5 +43,15 @@ func (sb *SQLiteBackend) ListGroups() ([]models.Group, error) {
func (sb *SQLiteBackend) GetArticlesCount(g models.Group) (int, error) {
var count int
return count, sb.db.Select(&count, "SELECT COUNT(*) FROM articles_to_groups WHERE group_id = ?", g.ID)
return count, sb.db.Get(&count, "SELECT COUNT(*) FROM articles_to_groups WHERE group_id = ?", g.ID)
}
func (sb *SQLiteBackend) GetGroupHighWaterMark(g models.Group) (int, error) {
var waterMark int
return waterMark, sb.db.Get(&waterMark, "SELECT article_id FROM articles_to_groups WHERE group_id = ? ORDER BY article_id DESC LIMIT 1", g.ID)
}
func (sb *SQLiteBackend) GetGroupLowWaterMark(g models.Group) (int, error) {
var waterMark int
return waterMark, sb.db.Get(&waterMark, "SELECT article_id FROM articles_to_groups WHERE group_id = ? ORDER BY article_id LIMIT 1", g.ID)
}

2
internal/backend/storage_backend.go
View File

@ -9,4 +9,6 @@ const (
type StorageBackend interface {
ListGroups() ([]models.Group, error)
GetArticlesCount(g models.Group) (int, error)
GetGroupLowWaterMark(g models.Group) (int, error)
GetGroupHighWaterMark(g models.Group) (int, error)
}

1
internal/models/group.go
View File

@ -4,4 +4,5 @@ type Group struct {
ID int `db:"id"`
GroupName string `db:"group_name"`
Description *string `db:"description"`
CreatedAt uint64 `db:"created_at"`
}

2
internal/protocol/constants.go
View File

@ -29,7 +29,7 @@ const (
const (
MessageNNTPServiceReadyPostingProhibited = "201 YANS NNTP Service Ready, posting prohibited"
MessageReaderModePostingProhibited = "201 Reader mode, posting prohibited"
MessageNNTPServiceExitsNormally = "205 NNTP Service exits normally"
MessageNNTPServiceExitsNormally = "205 NNTP Service exits normally, bye!"
MessageUnknownCommand = "500 Unknown command"
MessageErrorHappened = "403 Failed to process command:"
MessageListOfNewsgroupsFollows = "215 list of newsgroups follows"

45
internal/server/handler.go
View File

@ -9,14 +9,14 @@ import (
)
type Handler struct {
handlers map[string]func(s *Session, arguments []string) error
handlers map[string]func(s *Session, arguments []string, id uint) error
backend backend.StorageBackend
}
func NewHandler(b backend.StorageBackend) *Handler {
h := &Handler{}
h.backend = b
h.handlers = map[string]func(s *Session, arguments []string) error{
h.handlers = map[string]func(s *Session, arguments []string, id uint) error{
protocol.CommandCapabilities: h.handleCapabilities,
protocol.CommandDate: h.handleDate,
protocol.CommandQuit: h.handleQuit,
@ -26,21 +26,25 @@ func NewHandler(b backend.StorageBackend) *Handler {
return h
}
func (h *Handler) handleCapabilities(s *Session, arguments []string) error {
func (h *Handler) handleCapabilities(s *Session, arguments []string, id uint) error {
s.tconn.StartResponse(id)
defer s.tconn.EndResponse(id)
return s.tconn.PrintfLine(s.capabilities.String())
}
func (h *Handler) handleDate(s *Session, arguments []string) error {
func (h *Handler) handleDate(s *Session, arguments []string, id uint) error {
s.tconn.StartResponse(id)
defer s.tconn.EndResponse(id)
return s.tconn.PrintfLine("111 %s", time.Now().UTC().Format("20060102150405"))
}
func (h *Handler) handleQuit(s *Session, arguments []string) error {
func (h *Handler) handleQuit(s *Session, arguments []string, id uint) error {
s.tconn.PrintfLine(protocol.MessageNNTPServiceExitsNormally)
s.conn.Close()
return nil
}
func (h *Handler) handleList(s *Session, arguments []string) error {
func (h *Handler) handleList(s *Session, arguments []string, id uint) error {
sb := strings.Builder{}
listType := ""
@ -48,6 +52,9 @@ func (h *Handler) handleList(s *Session, arguments []string) error {
listType = arguments[0]
}
s.tconn.StartResponse(id)
defer s.tconn.EndResponse(id)
switch listType {
case "":
fallthrough
@ -60,7 +67,23 @@ func (h *Handler) handleList(s *Session, arguments []string) error {
sb.Write([]byte(protocol.MessageListOfNewsgroupsFollows + protocol.CRLF))
for _, v := range groups {
// TODO set high/low mark and posting status to actual values
sb.Write([]byte(fmt.Sprintf("%s 0 0 n"+protocol.CRLF, v.GroupName)))
c, err := h.backend.GetArticlesCount(v)
if err != nil {
return err
}
if c > 0 {
highWaterMark, err := h.backend.GetGroupHighWaterMark(v)
if err != nil {
return err
}
lowWaterMark, err := h.backend.GetGroupLowWaterMark(v)
if err != nil {
return err
}
sb.Write([]byte(fmt.Sprintf("%s %d %d n"+protocol.CRLF, v.GroupName, highWaterMark, lowWaterMark)))
} else {
sb.Write([]byte(fmt.Sprintf("%s 0 0 n"+protocol.CRLF, v.GroupName)))
}
}
}
case "NEWSGROUPS":
@ -90,7 +113,7 @@ func (h *Handler) handleList(s *Session, arguments []string) error {
return s.tconn.PrintfLine(sb.String())
}
func (h *Handler) handleModeReader(s *Session, arguments []string) error {
func (h *Handler) handleModeReader(s *Session, arguments []string, id uint) error {
if len(arguments) == 0 || arguments[0] != "READER" {
return s.tconn.PrintfLine(protocol.MessageSyntaxError)
}
@ -104,7 +127,7 @@ func (h *Handler) handleModeReader(s *Session, arguments []string) error {
return s.tconn.PrintfLine(protocol.MessageReaderModePostingProhibited) // TODO vary on auth status
}
func (h *Handler) Handle(s *Session, message string) error {
func (h *Handler) Handle(s *Session, message string, id uint) error {
splittedMessage := strings.Split(message, " ")
for i, v := range splittedMessage {
splittedMessage[i] = strings.TrimSpace(v)
@ -112,7 +135,9 @@ func (h *Handler) Handle(s *Session, message string) error {
cmdName := splittedMessage[0]
handler, ok := h.handlers[cmdName]
if !ok {
s.tconn.StartResponse(id)
defer s.tconn.EndResponse(id)
return s.tconn.PrintfLine(protocol.MessageUnknownCommand)
}
return handler(s, splittedMessage[1:])
return handler(s, splittedMessage[1:], id)
}

5
internal/server/session.go
View File

@ -70,6 +70,8 @@ func (s *Session) loop() {
break
default:
{
id := s.tconn.Next()
s.tconn.StartRequest(id)
message, err := s.tconn.ReadLine()
if err != nil {
if err == io.EOF || err.(*net.OpError).Unwrap() == net.ErrClosed {
@ -80,8 +82,9 @@ func (s *Session) loop() {
}
return
}
s.tconn.EndRequest(id)
log.Printf("Received message from %s: %s", s.conn.RemoteAddr().String(), message) // for debugging
err = s.h.Handle(s, message)
err = s.h.Handle(s, message, id)
if err != nil {
log.Print(err)
s.tconn.PrintfLine("%s %s", protocol.MessageErrorHappened, err.Error())