wrap errors for debugging purposes

pkg/generate/generate.go

@@ -6,6 +6,7 @@ import (
 	"path/filepath"
 	"strings"
 
+	"github.com/pkg/errors"
 	schemasv1alpha3 "github.com/schemahero/schemahero/pkg/apis/schemas/v1alpha3"
 	"github.com/schemahero/schemahero/pkg/database/interfaces"
 	"github.com/schemahero/schemahero/pkg/database/mysql"
@@ -32,47 +33,42 @@ func (g *Generator) RunSync() error {
 	if g.Viper.GetString("driver") == "postgres" {
 		pgDb, err := postgres.Connect(g.Viper.GetString("uri"))
 		if err != nil {
-			return err
+			return errors.Wrap(err, "postgres connect")
 		}
 		db = pgDb
 	} else if g.Viper.GetString("driver") == "mysql" {
 		mysqlDb, err := mysql.Connect(g.Viper.GetString("uri"))
 		if err != nil {
-			return err
+			return errors.Wrap(err, "mysql connect")
 		}
 		db = mysqlDb
 	}
 
 	tableNames, err := db.ListTables()
 	if err != nil {
-		fmt.Printf("%#v\n", err)
-		return err
+		return errors.Wrap(err, "list tables")
 	}
 
 	filesWritten := make([]string, 0, 0)
 	for _, tableName := range tableNames {
 		primaryKey, err := db.GetTablePrimaryKey(tableName)
 		if err != nil {
-			fmt.Printf("%#v\n", err)
-			return err
+			return errors.Wrap(err, "get table primary key")
 		}
 
 		foreignKeys, err := db.ListTableForeignKeys(g.Viper.GetString("dbname"), tableName)
 		if err != nil {
-			fmt.Printf("%#v\n", err)
-			return err
+			return errors.Wrap(err, "list table foreign keys")
 		}
 
 		indexes, err := db.ListTableIndexes(g.Viper.GetString("dbname"), tableName)
 		if err != nil {
-			fmt.Printf("%#v\n", err)
-			return err
+			return errors.Wrap(err, "list table indexes")
 		}
 
 		columns, err := db.GetTableSchema(tableName)
 		if err != nil {
-			fmt.Printf("%#v\n", err)
-			return err
+			return errors.Wrap(err, "get table schema")
 		}
 
 		var primaryKeyColumns []string
@@ -81,8 +77,7 @@ func (g *Generator) RunSync() error {
 		}
 		tableYAML, err := generateTableYAML(g.Viper.GetString("driver"), g.Viper.GetString("dbname"), tableName, primaryKeyColumns, foreignKeys, indexes, columns)
 		if err != nil {
-			fmt.Printf("%#v\n", err)
-			return err
+			return errors.Wrap(err, "generate table yaml")
 		}
 
 		// If there was a outputdir set, write it, else print it

pkg/watcher/watcher.go

@@ -0,0 +1,52 @@
+package watcher
+
+import (
+	"fmt"
+	"time"
+
+	"github.com/pkg/errors"
+	"github.com/schemahero/schemahero/pkg/database/interfaces"
+	"github.com/schemahero/schemahero/pkg/database/mysql"
+	"github.com/schemahero/schemahero/pkg/database/postgres"
+	"github.com/spf13/viper"
+)
+
+type Watcher struct {
+	Viper *viper.Viper
+}
+
+func NewWatcher() *Watcher {
+	return &Watcher{
+		Viper: viper.GetViper(),
+	}
+}
+
+func (w *Watcher) RunSync() error {
+	fmt.Printf("connecting to %s\n", w.Viper.GetString("uri"))
+
+	var conn interfaces.SchemaHeroDatabaseConnection
+
+	if w.Viper.GetString("driver") == "postgres" {
+		c, err := postgres.Connect(w.Viper.GetString("uri"))
+		if err != nil {
+			return errors.Wrap(err, "postgres connect")
+		}
+
+		conn = c
+	} else if w.Viper.GetString("driver") == "mysql" {
+		c, err := mysql.Connect(w.Viper.GetString("uri"))
+		if err != nil {
+			return errors.Wrap(err, "mysql connect")
+		}
+
+		conn = c
+	}
+
+	for {
+		if _, err := conn.CheckAlive(w.Viper.GetString("namespace"), w.Viper.GetString("instance")); err != nil {
+			return errors.Wrap(err, "check alive")
+		}
+
+		time.Sleep(time.Second * 10)
+	}
+}