Adding console package

console/balance.go

@@ -0,0 +1,64 @@
+/* Implementing balance related console commands
+*/
+package console
+
+import (
+	"fmt"
+	"os"
+	"reflect"
+        "path/filepath"
+)
+
+
+// ConsoleCommand interface
+type Command interface {
+	FromOsArgs( args []string ) error	// Load data from os arguments
+	usage( string ) string			// usage message
+	defaults() error			// set default field values
+}
+
+
+type CmdGetBalance struct {
+	User		string
+	BalanceType	string
+	Direction	string
+}
+
+
+// name should be exec's name
+func ( self *CmdGetBalance ) usage( name string ) string {
+	return fmt.Sprintf( "usage: %s get_balance <user> <baltype> [<direction>]", name )
+}
+
+// set param defaults
+func ( self *CmdGetBalance ) defaults() error {
+	self.BalanceType = "MONETARY"
+	self.Direction = "OUT"
+	return nil
+}
+
+
+// Parses command line args and builds CmdBalance value
+func ( self *CmdGetBalance ) FromOsArgs( args []string ) error {
+	// Map arg indexes to "self.Value"s
+	idxArgsToFields := map[int]string{2:"User",3:"BalanceType",4:"Direction"}
+	if len(os.Args) < 3 {
+		return fmt.Errorf(self.usage(filepath.Base(args[0])))
+	}
+	// Args look OK, set defaults before going further
+	self.defaults()
+	// Dynamically set field values
+	for idx := range( args ) {
+		fldName,hasIdx := idxArgsToFields[idx]
+		if !hasIdx {
+			continue
+		}
+		// field defined to be set by os.Args index
+		if fld := reflect.ValueOf(self).Elem().FieldByName(fldName); fld.Kind() == reflect.String {
+			fld.SetString(args[idx])
+		} else if fld.Kind() == reflect.Int {
+			fld.SetInt(1) // Placeholder for future usage
+		}
+	}
+	return nil
+}