Golang Server.GetVSchema方法代码示例

//.........这里部分代码省略.........
				return nil, errors.New("cell param required")
			}
			return ts.GetTabletsByCell(ctx, cell)
		}

		// Get tablet health.
		if parts := strings.Split(tabletPath, "/"); len(parts) == 2 && parts[1] == "health" {
			tabletAlias, err := topoproto.ParseTabletAlias(parts[0])
			if err != nil {
				return nil, err
			}
			return tabletHealthCache.Get(ctx, tabletAlias)
		}

		tabletAlias, err := topoproto.ParseTabletAlias(tabletPath)
		if err != nil {
			return nil, err
		}

		// Perform an action on a tablet.
		if r.Method == "POST" {
			if err := r.ParseForm(); err != nil {
				return nil, err
			}
			action := r.FormValue("action")
			if action == "" {
				return nil, errors.New("must specify action")
			}
			return actions.ApplyTabletAction(ctx, action, tabletAlias, r), nil
		}

		// Get the tablet record.
		return ts.GetTablet(ctx, tabletAlias)
	})

	// EndPoints
	handleCollection("endpoints", func(r *http.Request) (interface{}, error) {
		// We expect cell/keyspace/shard/tabletType.
		epPath := getItemPath(r.URL.Path)
		parts := strings.Split(epPath, "/")
		if len(parts) != 4 {
			return nil, fmt.Errorf("invalid cell/keyspace/shard/tabletType: %q", epPath)
		}

		if parts[3] == "" {
			// tabletType is empty, so list the tablet types.
			return ts.GetSrvTabletTypesPerShard(ctx, parts[0], parts[1], parts[2])
		}

		tabletType, err := topoproto.ParseTabletType(parts[3])
		if err != nil {
			return nil, fmt.Errorf("invalid tablet type %v: %v", parts[3], err)
		}

		// Get the endpoints object for a specific type.
		ep, _, err := ts.GetEndPoints(ctx, parts[0], parts[1], parts[2], tabletType)
		return ep, err
	})

	// Schema Change
	http.HandleFunc(apiPrefix+"schema/apply", func(w http.ResponseWriter, r *http.Request) {
		req := struct{ Keyspace, SQL string }{}
		if err := unmarshalRequest(r, &req); err != nil {
			httpErrorf(w, r, "can't unmarshal request: %v", err)
			return
		}

		executor := schemamanager.NewTabletExecutor(
			tmclient.NewTabletManagerClient(),
			ts)

		schemamanager.Run(ctx,
			schemamanager.NewUIController(req.SQL, req.Keyspace, w), executor)
	})

	// VSchema
	http.HandleFunc(apiPrefix+"vschema/", func(w http.ResponseWriter, r *http.Request) {
		// Save VSchema
		if r.Method == "POST" {
			vschema, err := ioutil.ReadAll(r.Body)
			if err != nil {
				httpErrorf(w, r, "can't read request body: %v", err)
				return
			}
			if err := ts.SaveVSchema(ctx, string(vschema)); err != nil {
				httpErrorf(w, r, "can't save vschema: %v", err)
			}
			return
		}

		// Get VSchema
		vschema, err := ts.GetVSchema(ctx)
		if err != nil {
			httpErrorf(w, r, "can't get vschema: %v", err)
			return
		}
		w.Header().Set("Content-Type", jsonContentType)
		w.Write([]byte(vschema))
	})
}

// RebuildVSchema rebuilds the SrvVSchema for the provided cell list
// (or all cells if cell list is empty).
func RebuildVSchema(ctx context.Context, log logutil.Logger, ts topo.Server, cells []string) error {
	// get the actual list of cells
	if len(cells) == 0 {
		var err error
		cells, err = ts.GetKnownCells(ctx)
		if err != nil {
			return fmt.Errorf("GetKnownCells failed: %v", err)
		}
	}

	// get the keyspaces
	keyspaces, err := ts.GetKeyspaces(ctx)
	if err != nil {
		return fmt.Errorf("GetKeyspaces failed: %v", err)
	}

	// build the SrvVSchema in parallel, protected by mu
	wg := sync.WaitGroup{}
	mu := sync.Mutex{}
	var finalErr error
	srvVSchema := &vschemapb.SrvVSchema{
		Keyspaces: map[string]*vschemapb.Keyspace{},
	}
	for _, keyspace := range keyspaces {
		wg.Add(1)
		go func(keyspace string) {
			defer wg.Done()

			k, err := ts.GetVSchema(ctx, keyspace)
			if err == topo.ErrNoNode {
				err = nil
				k = &vschemapb.Keyspace{}
			}

			mu.Lock()
			defer mu.Unlock()
			if err != nil {
				log.Errorf("GetVSchema(%v) failed: %v", keyspace, err)
				finalErr = err
				return
			}
			srvVSchema.Keyspaces[keyspace] = k
		}(keyspace)
	}
	wg.Wait()
	if finalErr != nil {
		return finalErr
	}

	// now save the SrvVSchema in all cells in parallel
	for _, cell := range cells {
		wg.Add(1)
		go func(cell string) {
			defer wg.Done()
			if err := ts.UpdateSrvVSchema(ctx, cell, srvVSchema); err != nil {
				log.Errorf("UpdateSrvVSchema(%v) failed: %v", cell, err)
				mu.Lock()
				finalErr = err
				mu.Unlock()
			}
		}(cell)
	}
	wg.Wait()

	return finalErr
}