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http.go
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http.go
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package logbuf
import (
"bufio"
"fmt"
"io"
"net/http"
"os"
"path"
"sort"
"strconv"
"strings"
"time"
"github.com/Cloud-Foundations/Dominator/lib/html"
"github.com/Cloud-Foundations/Dominator/lib/url"
_ "github.com/Cloud-Foundations/tricorder/go/healthserver"
)
type countingWriter struct {
count uint64
writer io.Writer
prefixLine string
}
func (w *countingWriter) Write(p []byte) (n int, err error) {
if w.prefixLine != "" {
w.writer.Write([]byte(w.prefixLine))
w.prefixLine = ""
}
n, err = w.writer.Write(p)
if n > 0 {
w.count += uint64(n)
}
return
}
func (lb *LogBuffer) addHttpHandlers() {
if lb.options.HttpServeMux == nil {
return
}
html.ServeMuxHandleFunc(lb.options.HttpServeMux, "/logs",
lb.httpListHandler)
html.ServeMuxHandleFunc(lb.options.HttpServeMux, "/logs/dump",
lb.httpDumpHandler)
html.ServeMuxHandleFunc(lb.options.HttpServeMux, "/logs/showLast",
lb.httpShowLastHandler)
html.ServeMuxHandleFunc(lb.options.HttpServeMux, "/logs/showPreviousPanic",
lb.httpShowPreviousPanicHandler)
}
func (lb *LogBuffer) httpListHandler(w http.ResponseWriter, req *http.Request) {
if lb.options.Directory == "" {
return
}
writer := bufio.NewWriter(w)
defer writer.Flush()
parsedQuery := url.ParseQuery(req.URL)
_, recentFirst := parsedQuery.Flags["recentFirst"]
names, panicMap, err := lb.list(recentFirst)
if err != nil {
fmt.Fprintln(writer, err)
return
}
recentFirstString := ""
if recentFirst {
recentFirstString = "&recentFirst"
}
if parsedQuery.OutputType() == url.OutputTypeText {
for _, name := range names {
fmt.Fprintln(writer, name)
}
return
}
fmt.Fprintln(writer, "<body>")
fmt.Fprint(writer, "Logs: ")
if recentFirst {
fmt.Fprintf(writer, "showing recent first ")
fmt.Fprintln(writer, `<a href="logs">show recent last</a><br>`)
} else {
fmt.Fprintf(writer, "showing recent last ")
fmt.Fprintln(writer,
`<a href="logs?recentFirst">show recent first</a><br>`)
}
showRecentLinks(writer, recentFirstString)
fmt.Fprintln(writer, "<p>")
currentName := ""
lb.rwMutex.Lock()
if lb.file != nil {
currentName = path.Base(lb.file.Name())
}
lb.rwMutex.Unlock()
if recentFirst {
fmt.Fprintf(writer,
"<a href=\"logs/dump?name=latest%s\">current</a><br>\n",
recentFirstString)
}
for _, name := range names {
if name == currentName {
fmt.Fprintf(writer,
"<a href=\"logs/dump?name=%s%s\">%s</a> (current)<br>\n",
name, recentFirstString, name)
} else {
hasPanic := ""
if _, ok := panicMap[name]; ok {
hasPanic = " (has panic log)"
}
fmt.Fprintf(writer,
"<a href=\"logs/dump?name=%s%s\">%s</a>%s<br>\n",
name, recentFirstString, name, hasPanic)
}
}
if !recentFirst {
fmt.Fprintf(writer,
"<a href=\"logs/dump?name=latest%s\">current</a><br>\n",
recentFirstString)
}
fmt.Fprintln(writer, "</body>")
}
func showRecentLinks(w io.Writer, recentFirstString string) {
fmt.Fprintf(w, "Show last: <a href=\"logs/showLast?1m%s\">minute</a>\n",
recentFirstString)
fmt.Fprintf(w, " <a href=\"logs/showLast?10m%s\">10 min</a>\n",
recentFirstString)
fmt.Fprintf(w, " <a href=\"logs/showLast?1h%s\">hour</a>\n",
recentFirstString)
fmt.Fprintf(w, " <a href=\"logs/showLast?1d%s\">day</a>\n",
recentFirstString)
fmt.Fprintf(w, " <a href=\"logs/showLast?1w%s\">week</a>\n",
recentFirstString)
fmt.Fprintf(w, " <a href=\"logs/showLast?1M%s\">month</a>\n",
recentFirstString)
fmt.Fprintf(w, " <a href=\"logs/showLast?1y%s\">year</a>\n",
recentFirstString)
}
func (lb *LogBuffer) httpDumpHandler(w http.ResponseWriter, req *http.Request) {
parsedQuery := url.ParseQuery(req.URL)
name, ok := parsedQuery.Table["name"]
if !ok {
w.Header().Set("Content-Type", "text/plain; charset=utf-8")
w.WriteHeader(http.StatusBadRequest)
return
}
_, recentFirst := parsedQuery.Flags["recentFirst"]
if name == "latest" {
lbFilename := ""
lb.rwMutex.Lock()
if lb.file != nil {
lbFilename = lb.file.Name()
}
lb.rwMutex.Unlock()
if lbFilename == "" {
writer := bufio.NewWriter(w)
defer writer.Flush()
lb.Dump(writer, "", "", recentFirst)
return
}
name = path.Base(lbFilename)
}
file, err := os.Open(path.Join(lb.options.Directory,
path.Base(path.Clean(name))))
if err != nil {
w.Header().Set("Content-Type", "text/plain; charset=utf-8")
w.WriteHeader(http.StatusNotFound)
return
}
defer file.Close()
writer := bufio.NewWriter(w)
defer writer.Flush()
if recentFirst {
scanner := bufio.NewScanner(file)
lines := make([]string, 0)
for scanner.Scan() {
line := scanner.Text()
if len(line) < 1 {
continue
}
lines = append(lines, line)
}
if err = scanner.Err(); err == nil {
reverseStrings(lines)
for _, line := range lines {
fmt.Fprintln(writer, line)
}
}
} else {
_, err = io.Copy(writer, bufio.NewReader(file))
}
if err != nil {
fmt.Fprintln(writer, err)
}
}
func (lb *LogBuffer) httpShowLastHandler(w http.ResponseWriter,
req *http.Request) {
parsedQuery := url.ParseQuery(req.URL)
_, recentFirst := parsedQuery.Flags["recentFirst"]
for flag := range parsedQuery.Flags {
length := len(flag)
if length < 2 {
continue
}
unitChar := flag[length-1]
var unit time.Duration
switch unitChar {
case 's':
unit = time.Second
case 'm':
unit = time.Minute
case 'h':
unit = time.Hour
case 'd':
unit = time.Hour * 24
case 'w':
unit = time.Hour * 24 * 7
case 'M':
// TODO(rgooch): Fix this crude approximation.
unit = time.Hour * 24 * 31
case 'y':
unit = time.Hour * 24 * 365
default:
continue
}
if val, err := strconv.ParseUint(flag[:length-1], 10, 64); err != nil {
w.Header().Set("Content-Type", "text/plain; charset=utf-8")
w.WriteHeader(http.StatusBadRequest)
return
} else {
lb.showRecent(w, time.Duration(val)*unit, recentFirst)
return
}
}
w.Header().Set("Content-Type", "text/plain; charset=utf-8")
w.WriteHeader(http.StatusBadRequest)
}
func (lb *LogBuffer) showRecent(w io.Writer, duration time.Duration,
recentFirst bool) {
writer := bufio.NewWriter(w)
defer writer.Flush()
names, _, err := lb.list(true)
if err != nil {
fmt.Fprintln(writer, err)
return
}
earliestTime := time.Now().Add(-duration)
// Get a list of names which may be recent enough.
tmpNames := make([]string, 0, len(names))
for _, name := range names {
startTime, err := time.ParseInLocation(timeLayout, name, time.Local)
if err != nil {
continue
}
tmpNames = append(tmpNames, name)
if startTime.Before(earliestTime) {
break
}
}
names = tmpNames
if !recentFirst {
reverseStrings(names)
}
fmt.Fprintln(writer, "<body>")
cWriter := &countingWriter{writer: writer, prefixLine: "<pre>\n"}
lb.flush()
for _, name := range names {
cWriter.count = 0
foundReopenMessage, _ := lb.dumpSince(cWriter, name, earliestTime, "",
"\n", recentFirst)
if cWriter.count > 0 && !foundReopenMessage {
cWriter.prefixLine = "</pre>\n<hr>\n<pre>\n"
}
}
fmt.Fprintln(writer, "</pre>")
fmt.Fprintln(writer, "</body>")
}
func (lb *LogBuffer) list(recentFirst bool) (
[]string, map[string]struct{}, error) {
file, err := os.Open(lb.options.Directory)
if err != nil {
return nil, nil, err
}
fileInfos, err := file.Readdir(-1)
file.Close()
if err != nil {
return nil, nil, err
}
panicMap := make(map[string]struct{})
names := make([]string, 0, len(fileInfos))
for _, fi := range fileInfos {
if strings.Count(fi.Name(), ":") == 3 {
names = append(names, fi.Name())
if fi.Mode()&os.ModeSticky != 0 {
panicMap[fi.Name()] = struct{}{}
}
}
}
sort.Strings(names)
if recentFirst {
reverseStrings(names)
}
return names, panicMap, nil
}
func (lb *LogBuffer) httpShowPreviousPanicHandler(w http.ResponseWriter,
req *http.Request) {
writer := bufio.NewWriter(w)
defer writer.Flush()
panicLogfile := lb.panicLogfile
if panicLogfile == nil {
fmt.Fprintln(writer, "Last invocation did not panic!")
return
}
if *panicLogfile == "" {
fmt.Fprintln(writer, "Logfile for previous invocation has expired")
return
}
file, err := os.Open(path.Join(lb.options.Directory, *panicLogfile))
if err != nil {
w.Header().Set("Content-Type", "text/plain; charset=utf-8")
w.WriteHeader(http.StatusNotFound)
return
}
defer file.Close()
_, err = io.Copy(writer, bufio.NewReader(file))
if err != nil {
fmt.Fprintln(writer, err)
}
}
func (lb *LogBuffer) writeHtml(writer io.Writer) {
fmt.Fprintln(writer, `<a href="logs">Logs:</a><br>`)
panicLogfile := lb.panicLogfile
if panicLogfile != nil {
fmt.Fprint(writer,
"<font color=\"red\">Last invocation paniced</font>, ")
if *panicLogfile == "" {
fmt.Fprintln(writer, "logfile no longer available<br>")
} else {
fmt.Fprintln(writer,
"<a href=\"logs/showPreviousPanic\">logfile</a><br>")
}
}
fmt.Fprintln(writer, "<pre>")
lb.dump(writer, "", "", false, true)
fmt.Fprintln(writer, "</pre>")
}