| // Copyright 2016 Google LLC |
| // |
| // 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 internal |
| |
| import ( |
| "fmt" |
| "runtime" |
| "strings" |
| "sync" |
| "unicode" |
| ) |
| |
| const ( |
| // ProdAddr is the production address. |
| ProdAddr = "logging.googleapis.com:443" |
| ) |
| |
| // InstrumentOnce guards instrumenting logs one time |
| var InstrumentOnce = new(sync.Once) |
| |
| // LogPath creates a formatted path from a parent and a logID. |
| func LogPath(parent, logID string) string { |
| logID = strings.Replace(logID, "/", "%2F", -1) |
| return fmt.Sprintf("%s/logs/%s", parent, logID) |
| } |
| |
| // LogIDFromPath parses and returns the ID from a log path. |
| func LogIDFromPath(parent, path string) string { |
| start := len(parent) + len("/logs/") |
| if len(path) < start { |
| return "" |
| } |
| logID := path[start:] |
| return strings.Replace(logID, "%2F", "/", -1) |
| } |
| |
| // VersionGo returns the Go runtime version. The returned string |
| // has no whitespace, suitable for reporting in header. |
| func VersionGo() string { |
| const develPrefix = "devel +" |
| |
| s := runtime.Version() |
| if strings.HasPrefix(s, develPrefix) { |
| s = s[len(develPrefix):] |
| if p := strings.IndexFunc(s, unicode.IsSpace); p >= 0 { |
| s = s[:p] |
| } |
| return s |
| } |
| |
| notSemverRune := func(r rune) bool { |
| return !strings.ContainsRune("0123456789.", r) |
| } |
| |
| if strings.HasPrefix(s, "go1") { |
| s = s[2:] |
| var prerelease string |
| if p := strings.IndexFunc(s, notSemverRune); p >= 0 { |
| s, prerelease = s[:p], s[p:] |
| } |
| if strings.HasSuffix(s, ".") { |
| s += "0" |
| } else if strings.Count(s, ".") < 2 { |
| s += ".0" |
| } |
| if prerelease != "" { |
| s += "-" + prerelease |
| } |
| return s |
| } |
| return "UNKNOWN" |
| } |