119 lines
3.7 KiB
Go
119 lines
3.7 KiB
Go
// Copyright 2018, Google Inc.
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// All rights reserved.
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//
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions are
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// met:
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//
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// * Redistributions of source code must retain the above copyright
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// notice, this list of conditions and the following disclaimer.
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// * Redistributions in binary form must reproduce the above
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// copyright notice, this list of conditions and the following disclaimer
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// in the documentation and/or other materials provided with the
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// distribution.
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// * Neither the name of Google Inc. nor the names of its
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// contributors may be used to endorse or promote products derived from
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// this software without specific prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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package gax
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import (
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"bytes"
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"runtime"
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"strings"
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"unicode"
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)
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var (
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// GoVersion is a header-safe representation of the current runtime
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// environment's Go version. This is for GAX consumers that need to
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// report the Go runtime version in API calls.
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GoVersion string
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// version is a package internal global variable for testing purposes.
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version = runtime.Version
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)
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// versionUnknown is only used when the runtime version cannot be determined.
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const versionUnknown = "UNKNOWN"
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func init() {
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GoVersion = goVersion()
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}
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// goVersion returns a Go runtime version derived from the runtime environment
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// that is modified to be suitable for reporting in a header, meaning it has no
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// whitespace. If it is unable to determine the Go runtime version, it returns
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// versionUnknown.
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func goVersion() string {
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const develPrefix = "devel +"
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s := version()
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if strings.HasPrefix(s, develPrefix) {
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s = s[len(develPrefix):]
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if p := strings.IndexFunc(s, unicode.IsSpace); p >= 0 {
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s = s[:p]
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}
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return s
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} else if p := strings.IndexFunc(s, unicode.IsSpace); p >= 0 {
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s = s[:p]
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}
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notSemverRune := func(r rune) bool {
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return !strings.ContainsRune("0123456789.", r)
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}
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if strings.HasPrefix(s, "go1") {
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s = s[2:]
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var prerelease string
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if p := strings.IndexFunc(s, notSemverRune); p >= 0 {
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s, prerelease = s[:p], s[p:]
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}
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if strings.HasSuffix(s, ".") {
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s += "0"
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} else if strings.Count(s, ".") < 2 {
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s += ".0"
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}
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if prerelease != "" {
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// Some release candidates already have a dash in them.
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if !strings.HasPrefix(prerelease, "-") {
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prerelease = "-" + prerelease
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}
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s += prerelease
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}
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return s
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}
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return "UNKNOWN"
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}
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// XGoogHeader is for use by the Google Cloud Libraries only.
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//
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// XGoogHeader formats key-value pairs.
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// The resulting string is suitable for x-goog-api-client header.
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func XGoogHeader(keyval ...string) string {
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if len(keyval) == 0 {
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return ""
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}
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if len(keyval)%2 != 0 {
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panic("gax.Header: odd argument count")
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}
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var buf bytes.Buffer
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for i := 0; i < len(keyval); i += 2 {
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buf.WriteByte(' ')
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buf.WriteString(keyval[i])
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buf.WriteByte('/')
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buf.WriteString(keyval[i+1])
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}
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return buf.String()[1:]
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}
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