Radu Macocian (admac)
305 lines
8.1 KiB
Go
305 lines
8.1 KiB
Go
package history
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import (
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"context"
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"crypto/sha256"
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"encoding/hex"
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"errors"
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"log/slog"
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"net"
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"net/url"
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"strings"
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"git.estatecloud.org/radumaco/souvenir/config"
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"git.estatecloud.org/radumaco/souvenir/db"
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"git.estatecloud.org/radumaco/souvenir/model"
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"github.com/gopsql/pgx"
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"github.com/jackc/pgx/v5/pgxpool"
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)
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type DbClient struct {
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cfg config.DbConfig
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logger slog.Logger
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pool *pgxpool.Pool
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}
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func Init(ctx context.Context, cfg config.DbConfig) (*DbClient, error) {
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logger := *slog.Default().With("Component", "History")
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if err := ensureDbExists(cfg, logger); err != nil {
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return nil, err
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}
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pool, err := pgxpool.New(ctx, cfg.ConnectionString())
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if err != nil {
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logger.ErrorContext(ctx, "Could not create pgxpool")
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return nil, err
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}
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tables := []struct {
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tableName string
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script string
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}{
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{"conversations", db.ConversationTableScript},
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{"messages", db.MessageTableScript},
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{"message_chunks", db.MessageChunkTableScript},
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}
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for _, table := range tables {
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var exists bool
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if err := pool.QueryRow(ctx,
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`
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SELECT EXISTS (
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SELECT 1
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FROM information_schema.tables
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WHERE table_schema = 'public'
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AND table_name =$1
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)
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`,
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table.tableName).Scan(&exists); err != nil {
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logger.Error("Error while checking table", "table", table.tableName, "error", err)
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return nil, err
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}
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if exists {
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logger.Debug("Table found", "table", table.tableName)
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} else {
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logger.Debug("Table not found. Creating", "table", table.tableName)
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if _, err := pool.Exec(ctx, table.script); err != nil {
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logger.Error("Could not create table", "table", table.tableName, "error", err)
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return nil, err
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}
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}
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}
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return &DbClient{
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logger: logger,
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cfg: cfg,
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pool: pool,
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}, nil
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}
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func (cl DbClient) GetConversation(ctx context.Context, id string) (model.Conversation, error) {
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cl.logger.Debug("Searching for conversation", "id", id)
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var conv model.Conversation
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if err := cl.pool.QueryRow(ctx,
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`
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SELECT id, title, summary
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FROM conversations
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WHERE id = $1
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`, id).Scan(&conv.Id, &conv.Title, &conv.Summary); err != nil {
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cl.logger.Error("Could not fetch conversation", "id", id, "error", err)
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return conv, err
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}
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rows, err := cl.pool.Query(ctx,
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`
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SELECT id, role, content, seq
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FROM messages
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WHERE conversation_id = $1
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ORDER BY seq
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`, id)
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if err != nil {
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cl.logger.Error("Could not fetch messages", "conversation_id", id, "error", err)
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return conv, err
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}
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defer rows.Close()
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var messages []model.Message
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for rows.Next() {
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var (
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msgId, role, content string
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seq int
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)
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err = rows.Scan(&msgId, &role, &content, &seq)
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if err != nil {
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cl.logger.Error("Could not get message", "error", err)
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}
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if len(messages) == 0 || messages[len(messages)-1].Id != msgId {
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messages = append(messages, model.Message{
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Id: msgId, Role: role, Content: content, Seq: seq,
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})
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}
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}
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conv.Messages = messages
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cl.logger.Debug("Found conversation", "conversation", conv)
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return conv, nil
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}
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func (cl DbClient) GetConversations(ctx context.Context) ([]model.Conversation, error) {
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cl.logger.Debug("Fetching conversations")
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rows, err := cl.pool.Query(ctx,
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`
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SELECT id, title, summary
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FROM conversations
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`)
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if err != nil {
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cl.logger.Error("Could not fetch conversations", "error", err)
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return []model.Conversation{}, err
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}
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defer rows.Close()
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conversations := []model.Conversation{}
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for rows.Next() {
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var conv model.Conversation
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rows.Scan(&conv.Id, &conv.Title, &conv.Summary)
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conversations = append(conversations, conv)
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}
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cl.logger.Debug("Found conversations", "count", len(conversations))
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return conversations, nil
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}
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func (cl DbClient) SaveConversation(ctx context.Context, conv model.Conversation) (model.Conversation, error) {
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cl.logger.Debug("Saving conversation", "conversation", conv)
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delta := 0
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if conv.Id == "" {
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if err := cl.pool.QueryRow(ctx,
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`
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INSERT INTO conversations(title, summary)
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VALUES ($1, $2)
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RETURNING id
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`,
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conv.Title, conv.Summary).Scan(&conv.Id); err != nil {
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cl.logger.Error("Could not create conversation", "title", conv.Title, "error", err)
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return conv, err
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}
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} else {
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if _, err := cl.pool.Exec(ctx,
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`
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UPDATE conversations
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SET title = $1, summary = $2
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WHERE id = $3`, conv.Title, conv.Summary, conv.Id); err != nil {
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cl.logger.Error("Could not update conversation", "id", conv.Id, "error", err)
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return conv, err
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}
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}
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if err := cl.pool.QueryRow(ctx,
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`
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SELECT COALESCE(MAX(seq) + 1, 1)
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FROM messages
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WHERE conversation_id = $1
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`,
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conv.Id).Scan(&delta); err != nil {
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cl.logger.Warn("Could not get delta", "conversation_id", conv.Id, "error", err)
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return conv, errors.New("Could not get delta")
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}
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cl.logger.Debug("Found delta.", "delta", delta, "Unsaved messages", len(conv.Messages[delta-1:]))
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if delta >= len(conv.Messages) {
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return conv, nil
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}
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for _, message := range conv.Messages[delta-1:] {
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id, err := cl.saveMessage(ctx, conv.Id, message)
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if err != nil {
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cl.logger.Error("Could not save message", "message_id", message.Id, "seq", message.Seq, "error", err)
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return conv, errors.New("Could not save message")
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}
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message.Id = id
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}
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return conv, nil
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}
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func (cl DbClient) saveMessage(ctx context.Context, conversation_id string, message model.Message) (string, error) {
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var exists bool
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if message.Id != "" {
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if err := cl.pool.QueryRow(ctx,
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`
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SELECT EXISTS (
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SELECT 1
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FROM messages
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WHERE id = $1
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)
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`,
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message.Id).Scan(&exists); err != nil {
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cl.logger.Warn("Error while scanning for message", "id", message.Id, "error", err)
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return message.Id, err
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}
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}
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if !exists {
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cl.logger.Debug("Insertting message ", "seq", message.Seq)
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if err := cl.pool.QueryRow(ctx,
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`
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INSERT INTO messages (seq, role, content, conversation_id)
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VALUES ($1, $2, $3, $4)
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RETURNING id
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`,
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message.Seq, message.Role, message.Content, conversation_id).Scan(&message.Id); err != nil {
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cl.logger.Error("Could not save message", "seq", message.Seq, "error", err)
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return message.Id, errors.New("Could not save message")
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}
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}
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chunks := Chunk(message.Content, cl.cfg.ChunkSize, cl.cfg.ChunkOverlap)
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for _, chunk := range chunks {
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hash := sha256.Sum256([]byte(chunk))
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if err := cl.pool.QueryRow(ctx,
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`
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SELECT EXISTS (
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SELECT 1
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FROM message_chunks
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WHERE message_id = $1
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AND content_hash = $2
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)
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`,
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message.Id, hex.EncodeToString(hash[:])).Scan(&exists); err != nil {
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cl.logger.Warn("Error while scanning for message_chunk", "message id", message.Id, "error", err)
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return message.Id, errors.New("Could not save message chunk")
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}
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if exists {
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cl.logger.Debug("Message chunk already exists. Skipping")
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continue
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}
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if _, err := cl.pool.Exec(ctx,
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`
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INSERT INTO message_chunks (conversation_id, message_id, content, content_hash)
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VALUES ($1, $2, $3, $4)
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`,
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conversation_id, message.Id, chunk, hex.EncodeToString(hash[:])); err != nil {
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cl.logger.Warn("Error while creating message chunk", "message id", message.Id, "error", err)
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}
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}
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return message.Id, nil
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}
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func (cl DbClient) Close() {
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cl.pool.Close()
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}
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func Chunk(text string, size int, overlap int) []string {
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if size <= overlap {
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return []string{}
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}
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words := strings.Fields(text)
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var chunks []string
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for start := 0; start < len(words); start += size - overlap {
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end := min(start+size, len(words))
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chunks = append(chunks, strings.Join(words[start:end], " "))
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if end == len(words) {
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return chunks
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}
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}
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return chunks
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}
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func ensureDbExists(cfg config.DbConfig, logger slog.Logger) error {
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maintenanceUrl := &url.URL{
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Scheme: "postgres",
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User: url.UserPassword(cfg.User, cfg.Password),
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Host: net.JoinHostPort(cfg.Url, cfg.Port),
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Path: "postgres",
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}
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conn := pgx.MustOpen(maintenanceUrl.String())
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defer conn.Close()
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var exists bool
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if err := conn.QueryRow(`SELECT EXISTS(SELECT 1 FROM pg_database WHERE datname = $1)`, cfg.DbName).Scan(&exists); err != nil {
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return err
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}
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if exists {
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logger.Debug("Database already exists", "name", cfg.DbName)
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return nil
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}
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logger.Info("Creating database", "name", cfg.DbName)
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_, err := conn.Exec(`CREATE DATABASE "` + cfg.DbName + `"`)
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return err
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}
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