cloudflared-mirror/vendor/google.golang.org/grpc/internal/envconfig/envconfig.go

65 lines
1.8 KiB
Go

/*
*
* Copyright 2018 gRPC 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 envconfig contains grpc settings configured by environment variables.
package envconfig
import (
"os"
"strings"
)
const (
prefix = "GRPC_GO_"
retryStr = prefix + "RETRY"
requireHandshakeStr = prefix + "REQUIRE_HANDSHAKE"
)
// RequireHandshakeSetting describes the settings for handshaking.
type RequireHandshakeSetting int
const (
// RequireHandshakeOn indicates to wait for handshake before considering a
// connection ready/successful.
RequireHandshakeOn RequireHandshakeSetting = iota
// RequireHandshakeOff indicates to not wait for handshake before
// considering a connection ready/successful.
RequireHandshakeOff
)
var (
// Retry is set if retry is explicitly enabled via "GRPC_GO_RETRY=on".
Retry = strings.EqualFold(os.Getenv(retryStr), "on")
// RequireHandshake is set based upon the GRPC_GO_REQUIRE_HANDSHAKE
// environment variable.
//
// Will be removed after the 1.18 release.
RequireHandshake = RequireHandshakeOn
)
func init() {
switch strings.ToLower(os.Getenv(requireHandshakeStr)) {
case "on":
fallthrough
default:
RequireHandshake = RequireHandshakeOn
case "off":
RequireHandshake = RequireHandshakeOff
}
}