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ui_controller.go
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ui_controller.go
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// Copyright 2015, Google Inc. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package schemamanager
import (
"encoding/json"
"fmt"
"net/http"
"strings"
log "github.com/golang/glog"
"golang.org/x/net/context"
)
// UIController handles schema events.
type UIController struct {
sqls []string
keyspace string
writer http.ResponseWriter
}
// NewUIController creates a UIController instance
func NewUIController(
sqlStr string, keyspace string, writer http.ResponseWriter) *UIController {
controller := &UIController{
sqls: make([]string, 0, 32),
keyspace: keyspace,
writer: writer,
}
for _, sql := range strings.Split(sqlStr, ";") {
s := strings.TrimSpace(sql)
if s != "" {
controller.sqls = append(controller.sqls, s)
}
}
return controller
}
// Open is a no-op.
func (controller *UIController) Open(ctx context.Context) error {
return nil
}
// Read reads schema changes
func (controller *UIController) Read(ctx context.Context) ([]string, error) {
return controller.sqls, nil
}
// Close is a no-op.
func (controller *UIController) Close() {
}
// Keyspace returns keyspace to apply schema.
func (controller *UIController) Keyspace() string {
return controller.keyspace
}
// OnReadSuccess is no-op
func (controller *UIController) OnReadSuccess(ctx context.Context) error {
controller.writer.Write(
[]byte(fmt.Sprintf("OnReadSuccess, sqls: %v\n", controller.sqls)))
return nil
}
// OnReadFail is no-op
func (controller *UIController) OnReadFail(ctx context.Context, err error) error {
controller.writer.Write(
[]byte(fmt.Sprintf("OnReadFail, error: %v\n", err)))
return err
}
// OnValidationSuccess is no-op
func (controller *UIController) OnValidationSuccess(ctx context.Context) error {
controller.writer.Write(
[]byte(fmt.Sprintf("OnValidationSuccess, sqls: %v\n", controller.sqls)))
return nil
}
// OnValidationFail is no-op
func (controller *UIController) OnValidationFail(ctx context.Context, err error) error {
controller.writer.Write(
[]byte(fmt.Sprintf("OnValidationFail, error: %v\n", err)))
return err
}
// OnExecutorComplete is no-op
func (controller *UIController) OnExecutorComplete(ctx context.Context, result *ExecuteResult) error {
data, err := json.Marshal(result)
if err != nil {
log.Errorf("Failed to serialize ExecuteResult: %v", err)
return err
}
controller.writer.Write([]byte(fmt.Sprintf("Executor succeeds: %s", string(data))))
return nil
}
var _ Controller = (*UIController)(nil)