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author | Christopher Speller <crspeller@gmail.com> | 2018-04-27 14:12:01 -0700 |
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committer | Christopher Speller <crspeller@gmail.com> | 2018-04-27 14:12:01 -0700 |
commit | eb9ff34fcfa51cd8205841a02f3d3d61ec5be8fa (patch) | |
tree | ed01fd9488bd86f6c2daf0b299dff5beb43973db /vendor/go.uber.org/zap/stacktrace.go | |
parent | 2386acb3ddabd8827e21b1862c338a8b13a25de6 (diff) | |
parent | 2e6b3da1d3466db379fef0d61a23e2878d17ee9d (diff) | |
download | chat-eb9ff34fcfa51cd8205841a02f3d3d61ec5be8fa.tar.gz chat-eb9ff34fcfa51cd8205841a02f3d3d61ec5be8fa.tar.bz2 chat-eb9ff34fcfa51cd8205841a02f3d3d61ec5be8fa.zip |
Merge branch 'master' into advanced-permissions-phase-2
Diffstat (limited to 'vendor/go.uber.org/zap/stacktrace.go')
-rw-r--r-- | vendor/go.uber.org/zap/stacktrace.go | 126 |
1 files changed, 126 insertions, 0 deletions
diff --git a/vendor/go.uber.org/zap/stacktrace.go b/vendor/go.uber.org/zap/stacktrace.go new file mode 100644 index 000000000..100fac216 --- /dev/null +++ b/vendor/go.uber.org/zap/stacktrace.go @@ -0,0 +1,126 @@ +// Copyright (c) 2016 Uber Technologies, Inc. +// +// Permission is hereby granted, free of charge, to any person obtaining a copy +// of this software and associated documentation files (the "Software"), to deal +// in the Software without restriction, including without limitation the rights +// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell +// copies of the Software, and to permit persons to whom the Software is +// furnished to do so, subject to the following conditions: +// +// The above copyright notice and this permission notice shall be included in +// all copies or substantial portions of the Software. +// +// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR +// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, +// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE +// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER +// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, +// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN +// THE SOFTWARE. + +package zap + +import ( + "runtime" + "strings" + "sync" + + "go.uber.org/zap/internal/bufferpool" +) + +const _zapPackage = "go.uber.org/zap" + +var ( + _stacktracePool = sync.Pool{ + New: func() interface{} { + return newProgramCounters(64) + }, + } + + // We add "." and "/" suffixes to the package name to ensure we only match + // the exact package and not any package with the same prefix. + _zapStacktracePrefixes = addPrefix(_zapPackage, ".", "/") + _zapStacktraceVendorContains = addPrefix("/vendor/", _zapStacktracePrefixes...) +) + +func takeStacktrace() string { + buffer := bufferpool.Get() + defer buffer.Free() + programCounters := _stacktracePool.Get().(*programCounters) + defer _stacktracePool.Put(programCounters) + + var numFrames int + for { + // Skip the call to runtime.Counters and takeStacktrace so that the + // program counters start at the caller of takeStacktrace. + numFrames = runtime.Callers(2, programCounters.pcs) + if numFrames < len(programCounters.pcs) { + break + } + // Don't put the too-short counter slice back into the pool; this lets + // the pool adjust if we consistently take deep stacktraces. + programCounters = newProgramCounters(len(programCounters.pcs) * 2) + } + + i := 0 + skipZapFrames := true // skip all consecutive zap frames at the beginning. + frames := runtime.CallersFrames(programCounters.pcs[:numFrames]) + + // Note: On the last iteration, frames.Next() returns false, with a valid + // frame, but we ignore this frame. The last frame is a a runtime frame which + // adds noise, since it's only either runtime.main or runtime.goexit. + for frame, more := frames.Next(); more; frame, more = frames.Next() { + if skipZapFrames && isZapFrame(frame.Function) { + continue + } else { + skipZapFrames = false + } + + if i != 0 { + buffer.AppendByte('\n') + } + i++ + buffer.AppendString(frame.Function) + buffer.AppendByte('\n') + buffer.AppendByte('\t') + buffer.AppendString(frame.File) + buffer.AppendByte(':') + buffer.AppendInt(int64(frame.Line)) + } + + return buffer.String() +} + +func isZapFrame(function string) bool { + for _, prefix := range _zapStacktracePrefixes { + if strings.HasPrefix(function, prefix) { + return true + } + } + + // We can't use a prefix match here since the location of the vendor + // directory affects the prefix. Instead we do a contains match. + for _, contains := range _zapStacktraceVendorContains { + if strings.Contains(function, contains) { + return true + } + } + + return false +} + +type programCounters struct { + pcs []uintptr +} + +func newProgramCounters(size int) *programCounters { + return &programCounters{make([]uintptr, size)} +} + +func addPrefix(prefix string, ss ...string) []string { + withPrefix := make([]string, len(ss)) + for i, s := range ss { + withPrefix[i] = prefix + s + } + return withPrefix +} |