commit fe8c96f0f064b244448a878c0a4cb7c12a5dfb5e · veryroundbird.house/core

+83
knotclient/cursor/sqlite.go
···

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       package cursor

     

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       import (

     

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       	"database/sql"

     

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       	"fmt"

     

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       	_ "github.com/mattn/go-sqlite3"

     

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       )

     

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       type SqliteStore struct {

     

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       	db        *sql.DB

     

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       	tableName string

     

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       }

     

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       type SqliteStoreOpt func(*SqliteStore)

     

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       func WithTableName(name string) SqliteStoreOpt {

     

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       	return func(s *SqliteStore) {

     

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       		s.tableName = name

     

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       	}

     

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       }

     

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       func NewSQLiteStore(dbPath string, opts ...SqliteStoreOpt) (*SqliteStore, error) {

     

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       	db, err := sql.Open("sqlite3", dbPath)

     

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       	if err != nil {

     

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       		return nil, fmt.Errorf("failed to open sqlite database: %w", err)

     

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       	}

     

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       	store := &SqliteStore{

     

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       		db:        db,

     

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       		tableName: "cursors",

     

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       	}

     

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       	for _, o := range opts {

     

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       		o(store)

     

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       	}

     

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       	if err := store.init(); err != nil {

     

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       		return nil, err

     

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       	}

     

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       	return store, nil

     

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       }

     

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       func (s *SqliteStore) init() error {

     

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       	createTable := fmt.Sprintf(`

     

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       	create table if not exists %s (

     

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       		knot text primary key,

     

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       		cursor text

     

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       	);`, s.tableName)

     

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       	_, err := s.db.Exec(createTable)

     

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       	return err

     

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       }

     

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       func (s *SqliteStore) Set(knot string, cursor int64) {

     

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       	query := fmt.Sprintf(`

     

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       		insert into %s (knot, cursor)

     

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       		values (?, ?)

     

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       		on conflict(knot) do update set cursor=excluded.cursor;

     

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       	`, s.tableName)

     

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       	_, err := s.db.Exec(query, knot, cursor)

     

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       	if err != nil {

     

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       		// TODO: log here

     

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       	}

     

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       }

     

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       func (s *SqliteStore) Get(knot string) (cursor int64) {

     

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       	query := fmt.Sprintf(`

     

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       		select cursor from %s where knot = ?;

     

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       	`, s.tableName)

     

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       	err := s.db.QueryRow(query, knot).Scan(&cursor)

     

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       	if err != nil {

     

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       		if err != sql.ErrNoRows {

     

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       			// TODO: log here

     

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       		}

     

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       		return 0

     

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       	}

     

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       	return cursor

     

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       }