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// Copyright 2016 CoreOS, Inc.
//
// 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 code
import (
"bufio"
"fmt"
"io"
"strings"
"unicode"
)
const (
pfxGofail = `// gofail:`
labelGofail = `/* gofail-label */`
errVarGoFail = `__fpErr`
)
// ToFailpoints turns all gofail comments into failpoint code. Returns a list of
// all failpoints it activated.
func ToFailpoints(wdst io.Writer, rsrc io.Reader) (fps []*Failpoint, err error) {
var curfp *Failpoint
dst := bufio.NewWriter(wdst)
defer func() {
if err == nil && curfp != nil {
err = curfp.flush(dst)
}
if err == nil {
err = dst.Flush()
}
}()
src := bufio.NewReader(rsrc)
for err == nil {
l, rerr := src.ReadString('\n')
if curfp != nil {
if strings.HasPrefix(strings.TrimSpace(l), "//") {
if len(l) > 0 && l[len(l)-1] == '\n' {
l = l[:len(l)-1]
}
curfp.code = append(curfp.code, strings.Replace(l, "//", "\t", 1))
continue
} else {
curfp.flush(dst)
fps = append(fps, curfp)
curfp = nil
}
} else if label := gofailLabel(l, pfxGofail, labelGofail); label != "" {
// expose gofail label
l = label
} else if curfp, err = newFailpoint(l); err != nil {
return
} else if curfp != nil {
// found a new failpoint
continue
}
if _, err = dst.WriteString(l); err != nil {
return
}
if rerr == io.EOF {
break
}
}
return
}
// ToComments turns all failpoint code into GOFAIL comments. It returns
// a list of all failpoints it deactivated.
func ToComments(wdst io.Writer, rsrc io.Reader) (fps []*Failpoint, err error) {
src := bufio.NewReader(rsrc)
dst := bufio.NewWriter(wdst)
ws := ""
unmatchedBraces := 0
for err == nil {
l, rerr := src.ReadString('\n')
err = rerr
lTrim := strings.TrimSpace(l)
if unmatchedBraces > 0 {
opening, closing := numBraces(l)
unmatchedBraces += opening - closing
if unmatchedBraces == 0 {
// strip off badType footer
lTrim = strings.Split(lTrim, "; __badType")[0]
}
s := ws + "//" + wsPrefix(l, ws)[1:] + lTrim + "\n"
dst.WriteString(s)
continue
}
isErrVarGoFail := strings.Contains(l, fmt.Sprintf(", %s := __fp_", errVarGoFail))
isHdr := isErrVarGoFail && strings.HasPrefix(lTrim, "if")
if isHdr {
pfx := pfxGofail
ws = strings.Split(l, "i")[0]
n := strings.Split(strings.Split(l, "__fp_")[1], ".")[0]
t := strings.Split(strings.Split(l, ".(")[1], ")")[0]
dst.WriteString(ws + pfx + " var " + n + " " + t + "\n")
if !strings.Contains(l, "; __badType") {
// not single liner
unmatchedBraces = 1
}
fps = append(fps, &Failpoint{name: n, varType: t})
continue
}
if isLabel := strings.Contains(l, "\t"+labelGofail); isLabel {
l = strings.Replace(l, labelGofail, pfxGofail, 1)
}
if _, werr := dst.WriteString(l); werr != nil {
return fps, werr
}
}
if err == io.EOF {
err = nil
}
dst.Flush()
return
}
func gofailLabel(l string, pfx string, lb string) string {
if !strings.HasPrefix(strings.TrimSpace(l), pfx) {
return ""
}
label := strings.SplitAfter(l, pfx)[1]
if len(label) == 0 || !strings.Contains(label, ":") {
return ""
}
return strings.Replace(l, pfx, lb, 1)
}
func numBraces(l string) (opening int, closing int) {
for i := 0; i < len(l); i++ {
switch l[i] {
case '{':
opening++
case '}':
closing++
}
}
return
}
// wsPrefix computes the left padding of a line given a whitespace prefix.
func wsPrefix(l, wsPfx string) string {
lws := ""
if len(wsPfx) == 0 {
lws = l
} else {
wsSplit := strings.SplitAfter(l, wsPfx)
if len(wsSplit) < 2 {
return ""
}
lws = strings.Join(wsSplit[1:], "")
}
for i, c := range lws {
if !unicode.IsSpace(c) {
return lws[:i]
}
}
return lws
}
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