106 lines
3.0 KiB
Go
106 lines
3.0 KiB
Go
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/*
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Copyright 2016 Google Inc. All Rights Reserved.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package testutil
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import (
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"net"
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"strconv"
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"google.golang.org/grpc"
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"google.golang.org/grpc/codes"
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"google.golang.org/grpc/status"
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)
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// A Server is an in-process gRPC server, listening on a system-chosen port on
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// the local loopback interface. Servers are for testing only and are not
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// intended to be used in production code.
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//
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// To create a server, make a new Server, register your handlers, then call
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// Start:
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//
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// srv, err := NewServer()
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// ...
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// mypb.RegisterMyServiceServer(srv.Gsrv, &myHandler)
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// ....
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// srv.Start()
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//
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// Clients should connect to the server with no security:
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//
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// conn, err := grpc.Dial(srv.Addr, grpc.WithInsecure())
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// ...
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type Server struct {
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Addr string
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l net.Listener
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Gsrv *grpc.Server
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}
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// NewServer creates a new Server. The Server will be listening for gRPC connections
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// at the address named by the Addr field, without TLS.
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func NewServer(opts ...grpc.ServerOption) (*Server, error) {
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l, err := net.Listen("tcp", "127.0.0.1:0")
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if err != nil {
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return nil, err
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}
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s := &Server{
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Addr: l.Addr().String(),
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l: l,
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Gsrv: grpc.NewServer(opts...),
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}
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return s, nil
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}
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// Start causes the server to start accepting incoming connections.
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// Call Start after registering handlers.
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func (s *Server) Start() {
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go s.Gsrv.Serve(s.l)
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}
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// Close shuts down the server.
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func (s *Server) Close() {
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s.Gsrv.Stop()
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s.l.Close()
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}
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// PageBounds converts an incoming page size and token from an RPC request into
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// slice bounds and the outgoing next-page token.
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//
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// PageBounds assumes that the complete, unpaginated list of items exists as a
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// single slice. In addition to the page size and token, PageBounds needs the
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// length of that slice.
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//
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// PageBounds's first two return values should be used to construct a sub-slice of
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// the complete, unpaginated slice. E.g. if the complete slice is s, then
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// s[from:to] is the desired page. Its third return value should be set as the
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// NextPageToken field of the RPC response.
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func PageBounds(pageSize int, pageToken string, length int) (from, to int, nextPageToken string, err error) {
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from, to = 0, length
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if pageToken != "" {
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from, err = strconv.Atoi(pageToken)
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if err != nil {
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return 0, 0, "", status.Errorf(codes.InvalidArgument, "bad page token: %v", err)
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}
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if from >= length {
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return length, length, "", nil
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}
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}
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if pageSize > 0 && from+pageSize < length {
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to = from + pageSize
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nextPageToken = strconv.Itoa(to)
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}
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return from, to, nextPageToken, nil
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}
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