rpcplatform_newserver.go

/*
 * Copyright 2022 RPCPlatform Authors
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package rpcplatform

import (
	"fmt"
	"net"
	"strings"

	"github.com/nexcode/rpcplatform/internal/config"
	"github.com/nexcode/rpcplatform/internal/gears"
	"google.golang.org/grpc"
)

// NewServer creates a new server with the given name listening on addr.
// If addr is empty, the server listens on all available interfaces.
// If the port is 0, a random available port is automatically assigned.
func (p *RPCPlatform) NewServer(name, addr string, options ...ServerOption) (*Server, error) {
	if name == "" || strings.Contains(name, "/") {
		return nil, fmt.Errorf("%q: name is empty or contains «/»: %w", name, ErrInvalidServerName)
	}

	config := config.NewServer()

	for _, option := range p.config.ServerOptions {
		option(config)
	}

	for _, option := range options {
		option(config)
	}

	if config.Attributes == nil {
		config.Attributes = NewAttributes()
	}

	listener, err := net.Listen("tcp", addr)
	if err != nil {
		return nil, err
	}

	id := gears.UID()

	if p.config.OpenTelemetry != nil {
		if config.PublicAddr != "" {
			addr = config.PublicAddr
		} else {
			addr = listener.Addr().String()
		}

		statsHandler, err := p.openTelemetry(id, listener.Addr(), addr)
		if err != nil {
			return nil, err
		}

		config.GRPCOptions = append(config.GRPCOptions, grpc.StatsHandler(statsHandler))
	}

	return &Server{
		id:       id,
		name:     p.etcdPrefix + "/" + name,
		etcd:     p.etcdClient,
		server:   grpc.NewServer(config.GRPCOptions...),
		listener: listener,
		config:   config,
	}, nil
}