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server.go
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server.go
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package main
import (
"net/http"
"sync"
"github.com/fuzhe1989/local-tablestore-service-go/src/protocol"
"github.com/golang/protobuf/proto"
)
// Server stores data and provides all of handlers
type Server struct {
MetaManager MetaManager
}
// NewServer constructs a new Server
func NewServer(instances []string) *Server {
server := new(Server)
server.MetaManager.InstanceMap = make(map[string]TableMap)
for _, instance := range instances {
server.MetaManager.InstanceMap[instance] = make(TableMap)
}
return server
}
// ServerMethodHandler ...
type ServerMethodHandler = func(Request) Response
// GetHandler returns method handlers
func (server *Server) GetHandler(method string) ServerMethodHandler {
switch method {
case "CreateTable":
return server.handleCreateTable
}
panic("Unknown method:" + method)
}
func (server *Server) handleCreateTable(req Request) Response {
reqPB := protocol.CreateTableRequest{}
err := proto.Unmarshal(req.Data, &reqPB)
if err != nil {
// TODO: use correct error
return respondError(newUserNotExistError())
}
tableMeta, err := toServerTableMeta()
if err != nil {
return respondError(newInternalServerError())
}
status := server.MetaManager.TryCreateTable(string(req.InstanceName), tableMeta)
if !status.IsOK() {
return respondError(status)
}
respPB := protocol.CreateTableResponse{}
return respondProto(&respPB)
}
func respondError(err Status) Response {
errPB := protocol.Error{
Code: &err.Code,
Message: &err.Message,
}
data, marshalErr := proto.Marshal(&errPB)
if marshalErr != nil {
panic("Error on marshal PB:" + marshalErr.Error())
}
return Response{
Data: data,
HTTPStatus: err.HTTPStatus,
}
}
func respondProto(message proto.Message) Response {
data, marshalErr := proto.Marshal(message)
if marshalErr != nil {
panic("Error on marshal PB:" + marshalErr.Error())
}
return Response{
Data: data,
HTTPStatus: http.StatusOK,
}
}
// TableMeta differs from the pb version.
type TableMeta struct {
}
func toServerTableMeta() (*TableMeta, error) {
return &TableMeta{}, nil
}
// TableMap ...
type TableMap = map[string]*TableMeta
// MetaManager manages meta of all tables
type MetaManager struct {
Lock sync.Mutex
// instanceName -> tableMap
InstanceMap map[string]TableMap
}
// TryCreateTable ...
func (manager *MetaManager) TryCreateTable(instanceName string, tableMeta *TableMeta) Status {
manager.Lock.Lock()
defer manager.Lock.Unlock()
tables := manager.InstanceMap[instanceName]
if tables == nil {
return newInstanceNotFoundError()
}
// TODO
return newStatusOK()
}