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38cd455e4d
To help accommodate web browser interactions with websockets, when a streaming logs session is requested for the same actor while already serving a session for that user in a separate request, the original request will be closed and the new request start streaming logs instead. This should help with rogue sessions holding on for too long with no client on the other side (before idle timeout or connection close).
60 lines
1.4 KiB
Go
60 lines
1.4 KiB
Go
// Copyright 2023 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// package tokeninternal provides access to some internal features of the token
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// package.
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package tokeninternal
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import (
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"go/token"
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"sync"
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"unsafe"
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)
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// GetLines returns the table of line-start offsets from a token.File.
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func GetLines(file *token.File) []int {
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// token.File has a Lines method on Go 1.21 and later.
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if file, ok := (interface{})(file).(interface{ Lines() []int }); ok {
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return file.Lines()
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}
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// This declaration must match that of token.File.
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// This creates a risk of dependency skew.
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// For now we check that the size of the two
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// declarations is the same, on the (fragile) assumption
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// that future changes would add fields.
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type tokenFile119 struct {
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_ string
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_ int
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_ int
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mu sync.Mutex // we're not complete monsters
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lines []int
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_ []struct{}
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}
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type tokenFile118 struct {
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_ *token.FileSet // deleted in go1.19
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tokenFile119
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}
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type uP = unsafe.Pointer
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switch unsafe.Sizeof(*file) {
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case unsafe.Sizeof(tokenFile118{}):
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var ptr *tokenFile118
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*(*uP)(uP(&ptr)) = uP(file)
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ptr.mu.Lock()
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defer ptr.mu.Unlock()
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return ptr.lines
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case unsafe.Sizeof(tokenFile119{}):
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var ptr *tokenFile119
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*(*uP)(uP(&ptr)) = uP(file)
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ptr.mu.Lock()
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defer ptr.mu.Unlock()
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return ptr.lines
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default:
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panic("unexpected token.File size")
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}
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}
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