upgrade deps; rewrite smtp session

vendor/github.com/getsentry/sentry-go/internal/traceparser/parser.go

@@ -0,0 +1,217 @@
+package traceparser
+
+import (
+	"bytes"
+	"strconv"
+)
+
+var blockSeparator = []byte("\n\n")
+var lineSeparator = []byte("\n")
+
+// Parses multi-stacktrace text dump produced by runtime.Stack([]byte, all=true).
+// The parser prioritizes performance but requires the input to be well-formed in order to return correct data.
+// See https://github.com/golang/go/blob/go1.20.4/src/runtime/mprof.go#L1191
+func Parse(data []byte) TraceCollection {
+	var it = TraceCollection{}
+	if len(data) > 0 {
+		it.blocks = bytes.Split(data, blockSeparator)
+	}
+	return it
+}
+
+type TraceCollection struct {
+	blocks [][]byte
+}
+
+func (it TraceCollection) Length() int {
+	return len(it.blocks)
+}
+
+// Returns the stacktrace item at the given index.
+func (it *TraceCollection) Item(i int) Trace {
+	// The first item may have a leading data separator and the last one may have a trailing one.
+	// Note: Trim() doesn't make a copy for single-character cutset under 0x80. It will just slice the original.
+	var data []byte
+	switch {
+	case i == 0:
+		data = bytes.TrimLeft(it.blocks[i], "\n")
+	case i == len(it.blocks)-1:
+		data = bytes.TrimRight(it.blocks[i], "\n")
+	default:
+		data = it.blocks[i]
+	}
+
+	var splitAt = bytes.IndexByte(data, '\n')
+	if splitAt < 0 {
+		return Trace{header: data}
+	}
+
+	return Trace{
+		header: data[:splitAt],
+		data:   data[splitAt+1:],
+	}
+}
+
+// Trace represents a single stacktrace block, identified by a Goroutine ID and a sequence of Frames.
+type Trace struct {
+	header []byte
+	data   []byte
+}
+
+var goroutinePrefix = []byte("goroutine ")
+
+// GoID parses the Goroutine ID from the header.
+func (t *Trace) GoID() (id uint64) {
+	if bytes.HasPrefix(t.header, goroutinePrefix) {
+		var line = t.header[len(goroutinePrefix):]
+		var splitAt = bytes.IndexByte(line, ' ')
+		if splitAt >= 0 {
+			id, _ = strconv.ParseUint(string(line[:splitAt]), 10, 64)
+		}
+	}
+	return id
+}
+
+// UniqueIdentifier can be used as a map key to identify the trace.
+func (t *Trace) UniqueIdentifier() []byte {
+	return t.data
+}
+
+func (t *Trace) Frames() FrameIterator {
+	var lines = bytes.Split(t.data, lineSeparator)
+	return FrameIterator{lines: lines, i: 0, len: len(lines)}
+}
+
+func (t *Trace) FramesReversed() ReverseFrameIterator {
+	var lines = bytes.Split(t.data, lineSeparator)
+	return ReverseFrameIterator{lines: lines, i: len(lines)}
+}
+
+const framesElided = "...additional frames elided..."
+
+// FrameIterator iterates over stack frames.
+type FrameIterator struct {
+	lines [][]byte
+	i     int
+	len   int
+}
+
+// Next returns the next frame, or nil if there are none.
+func (it *FrameIterator) Next() Frame {
+	return Frame{it.popLine(), it.popLine()}
+}
+
+func (it *FrameIterator) popLine() []byte {
+	switch {
+	case it.i >= it.len:
+		return nil
+	case string(it.lines[it.i]) == framesElided:
+		it.i++
+		return it.popLine()
+	default:
+		it.i++
+		return it.lines[it.i-1]
+	}
+}
+
+// HasNext return true if there are values to be read.
+func (it *FrameIterator) HasNext() bool {
+	return it.i < it.len
+}
+
+// LengthUpperBound returns the maximum number of elements this stacks may contain.
+// The actual number may be lower because of elided frames. As such, the returned value
+// cannot be used to iterate over the frames but may be used to reserve capacity.
+func (it *FrameIterator) LengthUpperBound() int {
+	return it.len / 2
+}
+
+// ReverseFrameIterator iterates over stack frames in reverse order.
+type ReverseFrameIterator struct {
+	lines [][]byte
+	i     int
+}
+
+// Next returns the next frame, or nil if there are none.
+func (it *ReverseFrameIterator) Next() Frame {
+	var line2 = it.popLine()
+	return Frame{it.popLine(), line2}
+}
+
+func (it *ReverseFrameIterator) popLine() []byte {
+	it.i--
+	switch {
+	case it.i < 0:
+		return nil
+	case string(it.lines[it.i]) == framesElided:
+		return it.popLine()
+	default:
+		return it.lines[it.i]
+	}
+}
+
+// HasNext return true if there are values to be read.
+func (it *ReverseFrameIterator) HasNext() bool {
+	return it.i > 1
+}
+
+// LengthUpperBound returns the maximum number of elements this stacks may contain.
+// The actual number may be lower because of elided frames. As such, the returned value
+// cannot be used to iterate over the frames but may be used to reserve capacity.
+func (it *ReverseFrameIterator) LengthUpperBound() int {
+	return len(it.lines) / 2
+}
+
+type Frame struct {
+	line1 []byte
+	line2 []byte
+}
+
+// UniqueIdentifier can be used as a map key to identify the frame.
+func (f *Frame) UniqueIdentifier() []byte {
+	// line2 contains file path, line number and program-counter offset from the beginning of a function
+	// e.g. C:/Users/name/scoop/apps/go/current/src/testing/testing.go:1906 +0x63a
+	return f.line2
+}
+
+var createdByPrefix = []byte("created by ")
+
+func (f *Frame) Func() []byte {
+	if bytes.HasPrefix(f.line1, createdByPrefix) {
+		// Since go1.21, the line ends with " in goroutine X", saying which goroutine created this one.
+		// We currently don't have use for that so just remove it.
+		var line = f.line1[len(createdByPrefix):]
+		var spaceAt = bytes.IndexByte(line, ' ')
+		if spaceAt < 0 {
+			return line
+		}
+		return line[:spaceAt]
+	}
+
+	var end = bytes.LastIndexByte(f.line1, '(')
+	if end >= 0 {
+		return f.line1[:end]
+	}
+
+	return f.line1
+}
+
+func (f *Frame) File() (path []byte, lineNumber int) {
+	var line = f.line2
+	if len(line) > 0 && line[0] == '\t' {
+		line = line[1:]
+	}
+
+	var splitAt = bytes.IndexByte(line, ' ')
+	if splitAt >= 0 {
+		line = line[:splitAt]
+	}
+
+	splitAt = bytes.LastIndexByte(line, ':')
+	if splitAt < 0 {
+		return line, 0
+	}
+
+	lineNumber, _ = strconv.Atoi(string(line[splitAt+1:]))
+	return line[:splitAt], lineNumber
+}