1 // Copyright 2015 go-swagger maintainers 2 // 3 // Licensed under the Apache License, Version 2.0 (the "License"); 4 // you may not use this file except in compliance with the License. 5 // You may obtain a copy of the License at 6 // 7 // http://www.apache.org/licenses/LICENSE-2.0 8 // 9 // Unless required by applicable law or agreed to in writing, software 10 // distributed under the License is distributed on an "AS IS" BASIS, 11 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 12 // See the License for the specific language governing permissions and 13 // limitations under the License. 14 15 package spec 16 17 import ( 18 "fmt" 19 "log" 20 "os" 21 "path" 22 "runtime" 23 ) 24 25 // Debug is true when the SWAGGER_DEBUG env var is not empty. 26 // 27 // It enables a more verbose logging of this package. 28 var Debug = os.Getenv("SWAGGER_DEBUG") != "" 29 30 var ( 31 // specLogger is a debug logger for this package 32 specLogger *log.Logger 33 ) 34 35 func init() { 36 debugOptions() 37 } 38 39 func debugOptions() { 40 specLogger = log.New(os.Stdout, "spec:", log.LstdFlags) 41 } 42 43 func debugLog(msg string, args ...interface{}) { 44 // A private, trivial trace logger, based on go-openapi/spec/expander.go:debugLog() 45 if Debug { 46 _, file1, pos1, _ := runtime.Caller(1) 47 specLogger.Printf("%s:%d: %s", path.Base(file1), pos1, fmt.Sprintf(msg, args...)) 48 } 49 } 50