Create and open DB

.gitignore

@@ -0,0 +1 @@
+.vscode

db.go

@@ -0,0 +1,98 @@
+package peachy
+
+import (
+	"errors"
+	"fmt"
+	"os"
+
+	"zombiezen.com/go/sqlite"
+	"zombiezen.com/go/sqlite/sqlitex"
+)
+
+const AppID = '🍑'
+
+var ErrInvalidDB = errors.New("invalid database file")
+var ErrFileExists = errors.New("database file already exists")
+var ErrFileNotExist = errors.New("database file does not exist")
+
+type DBError struct{ error }
+
+func (dbe DBError) Error() string {
+	return "database error: " + dbe.error.Error()
+}
+
+type DB struct {
+	conn *sqlite.Conn
+}
+
+func (db *DB) Close() {
+	db.conn.Close()
+}
+
+func setupConn(conn *sqlite.Conn) error {
+	return nil
+}
+
+func Open(path string) (db *DB, err error) {
+	var conn *sqlite.Conn
+	defer func() {
+		if err != nil {
+			conn.Close()
+		}
+	}()
+
+	conn, err = sqlite.OpenConn(path, sqlite.OpenReadWrite|sqlite.OpenWAL)
+	switch sqlite.ErrCode(err) {
+	case sqlite.ResultOK:
+	case sqlite.ResultCantOpen:
+		return nil, ErrFileNotExist
+	case sqlite.ResultNotADB:
+		return nil, ErrInvalidDB
+	default:
+		return nil, DBError{err}
+	}
+
+	var goodAppID bool
+	sqlitex.ExecuteTransient(conn, "PRAGMA application_id", &sqlitex.ExecOptions{
+		ResultFunc: func(stmt *sqlite.Stmt) error {
+			goodAppID = stmt.ColumnInt32(0) == AppID
+			return nil
+		}})
+	if !goodAppID {
+		return nil, ErrInvalidDB
+	}
+	err = setupConn(conn)
+	if err != nil {
+		return nil, err
+	}
+	return &DB{conn: conn}, nil
+}
+
+func Create(path string) (db *DB, err error) {
+	var conn *sqlite.Conn
+	defer func() {
+		if err != nil {
+			conn.Close()
+		}
+	}()
+
+	finfo, _ := os.Stat(path)
+	if finfo != nil {
+		return nil, ErrFileExists
+	}
+
+	conn, err = sqlite.OpenConn(path, sqlite.OpenCreate|sqlite.OpenReadWrite|sqlite.OpenWAL)
+	if err != nil {
+		return nil, fmt.Errorf("could not create database: %w", err)
+	}
+	query := fmt.Sprintf("PRAGMA application_id=%d", AppID)
+	err = sqlitex.ExecuteTransient(conn, query, nil)
+	if err != nil {
+		return nil, DBError{err}
+	}
+	err = setupConn(conn)
+	if err != nil {
+		return nil, err
+	}
+	return &DB{conn: conn}, nil
+}

db_test.go

@@ -0,0 +1,69 @@
+package peachy_test
+
+import (
+	"os"
+	"path/filepath"
+	"testing"
+
+	"git.codemonkeysoftware.net/b/peachy-go"
+	"github.com/shoenig/test/must"
+	"zombiezen.com/go/sqlite"
+)
+
+func pending(t *testing.T) {
+	t.Fatalf("test not implemented")
+}
+
+func closeIfExists(db *peachy.DB) {
+	if db != nil {
+		db.Close()
+	}
+}
+
+func TestOpen(t *testing.T) {
+	t.Run("Open succeeds on DB created by Create", func(t *testing.T) {
+		dir := t.TempDir()
+		dbPath := filepath.Join(dir, "test.db")
+		db, err := peachy.Create(dbPath)
+		must.NoError(t, err)
+		db.Close()
+
+		db, err = peachy.Open(dbPath)
+		defer closeIfExists(db)
+		must.NotNil(t, db)
+		must.NoError(t, err)
+
+		// TODO Make sure the DB works once it has any methods.
+	})
+	t.Run("Open fails on alien SQLite DB", func(t *testing.T) {
+		dir := t.TempDir()
+		dbPath := filepath.Join(dir, "test.db")
+		conn, err := sqlite.OpenConn(dbPath)
+		must.NoError(t, err)
+		conn.Close()
+
+		db, err := peachy.Open(dbPath)
+		defer closeIfExists(db)
+		must.Nil(t, db)
+		must.ErrorIs(t, err, peachy.ErrInvalidDB)
+	})
+	t.Run("Open fails on nonexistent file", func(t *testing.T) {
+		dir := t.TempDir()
+		dbPath := filepath.Join(dir, "test.db")
+		db, err := peachy.Open(dbPath)
+		defer closeIfExists(db)
+		must.Nil(t, db)
+		must.ErrorIs(t, err, peachy.ErrFileNotExist)
+		must.FileNotExists(t, dbPath)
+	})
+	t.Run("Open fails on non-SQLite file", func(t *testing.T) {
+		path := filepath.Join(t.TempDir(), "test.db")
+		err := os.WriteFile(path, []byte("I'm not a database."), os.ModePerm)
+		must.NoError(t, err)
+
+		db, err := peachy.Open(path)
+		defer closeIfExists(db)
+		must.Nil(t, db)
+		must.ErrorIs(t, err, peachy.ErrInvalidDB, must.Sprint(sqlite.ErrCode(err)))
+	})
+}

go.mod

@@ -0,0 +1,25 @@
+module git.codemonkeysoftware.net/b/peachy-go
+
+go 1.22.1
+
+require (
+	github.com/pkg/browser v0.0.0-20240102092130-5ac0b6a4141c
+	github.com/shoenig/test v1.8.2
+	zombiezen.com/go/sqlite v1.3.0
+)
+
+require (
+	github.com/dustin/go-humanize v1.0.1 // indirect
+	github.com/google/go-cmp v0.6.0 // indirect
+	github.com/google/uuid v1.3.0 // indirect
+	github.com/mattn/go-isatty v0.0.16 // indirect
+	github.com/ncruces/go-strftime v0.1.9 // indirect
+	github.com/remyoudompheng/bigfft v0.0.0-20230129092748-24d4a6f8daec // indirect
+	golang.org/x/sys v0.16.0 // indirect
+	modernc.org/libc v1.41.0 // indirect
+	modernc.org/mathutil v1.6.0 // indirect
+	modernc.org/memory v1.7.2 // indirect
+	modernc.org/sqlite v1.29.1 // indirect
+)
+
+replace github.com/shoenig/test v1.8.2 => ../shoenig-test

go.sum

@@ -0,0 +1,30 @@
+github.com/dustin/go-humanize v1.0.1 h1:GzkhY7T5VNhEkwH0PVJgjz+fX1rhBrR7pRT3mDkpeCY=
+github.com/dustin/go-humanize v1.0.1/go.mod h1:Mu1zIs6XwVuF/gI1OepvI0qD18qycQx+mFykh5fBlto=
+github.com/google/go-cmp v0.6.0 h1:ofyhxvXcZhMsU5ulbFiLKl/XBFqE1GSq7atu8tAmTRI=
+github.com/google/go-cmp v0.6.0/go.mod h1:17dUlkBOakJ0+DkrSSNjCkIjxS6bF9zb3elmeNGIjoY=
+github.com/google/uuid v1.3.0 h1:t6JiXgmwXMjEs8VusXIJk2BXHsn+wx8BZdTaoZ5fu7I=
+github.com/google/uuid v1.3.0/go.mod h1:TIyPZe4MgqvfeYDBFedMoGGpEw/LqOeaOT+nhxU+yHo=
+github.com/mattn/go-isatty v0.0.16 h1:bq3VjFmv/sOjHtdEhmkEV4x1AJtvUvOJ2PFAZ5+peKQ=
+github.com/mattn/go-isatty v0.0.16/go.mod h1:kYGgaQfpe5nmfYZH+SKPsOc2e4SrIfOl2e/yFXSvRLM=
+github.com/ncruces/go-strftime v0.1.9 h1:bY0MQC28UADQmHmaF5dgpLmImcShSi2kHU9XLdhx/f4=
+github.com/ncruces/go-strftime v0.1.9/go.mod h1:Fwc5htZGVVkseilnfgOVb9mKy6w1naJmn9CehxcKcls=
+github.com/pkg/browser v0.0.0-20240102092130-5ac0b6a4141c h1:+mdjkGKdHQG3305AYmdv1U2eRNDiU2ErMBj1gwrq8eQ=
+github.com/pkg/browser v0.0.0-20240102092130-5ac0b6a4141c/go.mod h1:7rwL4CYBLnjLxUqIJNnCWiEdr3bn6IUYi15bNlnbCCU=
+github.com/remyoudompheng/bigfft v0.0.0-20230129092748-24d4a6f8daec h1:W09IVJc94icq4NjY3clb7Lk8O1qJ8BdBEF8z0ibU0rE=
+github.com/remyoudompheng/bigfft v0.0.0-20230129092748-24d4a6f8daec/go.mod h1:qqbHyh8v60DhA7CoWK5oRCqLrMHRGoxYCSS9EjAz6Eo=
+golang.org/x/sys v0.0.0-20220811171246-fbc7d0a398ab/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
+golang.org/x/sys v0.1.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
+golang.org/x/sys v0.16.0 h1:xWw16ngr6ZMtmxDyKyIgsE93KNKz5HKmMa3b8ALHidU=
+golang.org/x/sys v0.16.0/go.mod h1:/VUhepiaJMQUp4+oa/7Zr1D23ma6VTLIYjOOTFZPUcA=
+golang.org/x/text v0.14.0 h1:ScX5w1eTa3QqT8oi6+ziP7dTV1S2+ALU0bI+0zXKWiQ=
+golang.org/x/text v0.14.0/go.mod h1:18ZOQIKpY8NJVqYksKHtTdi31H5itFRjB5/qKTNYzSU=
+modernc.org/libc v1.41.0 h1:g9YAc6BkKlgORsUWj+JwqoB1wU3o4DE3bM3yvA3k+Gk=
+modernc.org/libc v1.41.0/go.mod h1:w0eszPsiXoOnoMJgrXjglgLuDy/bt5RR4y3QzUUeodY=
+modernc.org/mathutil v1.6.0 h1:fRe9+AmYlaej+64JsEEhoWuAYBkOtQiMEU7n/XgfYi4=
+modernc.org/mathutil v1.6.0/go.mod h1:Ui5Q9q1TR2gFm0AQRqQUaBWFLAhQpCwNcuhBOSedWPo=
+modernc.org/memory v1.7.2 h1:Klh90S215mmH8c9gO98QxQFsY+W451E8AnzjoE2ee1E=
+modernc.org/memory v1.7.2/go.mod h1:NO4NVCQy0N7ln+T9ngWqOQfi7ley4vpwvARR+Hjw95E=
+modernc.org/sqlite v1.29.1 h1:19GY2qvWB4VPw0HppFlZCPAbmxFU41r+qjKZQdQ1ryA=
+modernc.org/sqlite v1.29.1/go.mod h1:hG41jCYxOAOoO6BRK66AdRlmOcDzXf7qnwlwjUIOqa0=
+zombiezen.com/go/sqlite v1.3.0 h1:98g1gnCm+CNz6AuQHu0gqyw7gR2WU3O3PJufDOStpUs=
+zombiezen.com/go/sqlite v1.3.0/go.mod h1:yRl27//s/9aXU3RWs8uFQwjkTG9gYNGEls6+6SvrclY=

webadmin/main.go

@@ -0,0 +1,37 @@
+package main
+
+import (
+	"fmt"
+	"log"
+	"net"
+	"net/http"
+
+	"github.com/pkg/browser"
+)
+
+func handleHome(w http.ResponseWriter, r *http.Request) {
+	fmt.Fprint(w, "<h1>Hello Peachy!</h1>")
+}
+
+func run() error {
+	listener, err := net.Listen("tcp", ":0")
+	if err != nil {
+		return err
+	}
+	port := listener.Addr().(*net.TCPAddr).Port
+
+	homeURL := fmt.Sprintf("http://localhost:%d", port)
+	err = browser.OpenURL(homeURL)
+	if err != nil {
+		fmt.Printf("I couldn't open the browser automatically.\nDo it yourself, then go to %s.", homeURL)
+	}
+
+	return http.Serve(listener, http.HandlerFunc(handleHome))
+}
+
+func main() {
+	err := run()
+	if err != nil {
+		log.Fatal(err)
+	}
+}