func (g *ChanGroup) Sample(ctx slog.Context) {
ctx.Add("source", g.Name)
for i := 0; i < numSeries; i++ {
// TODO: If we set the ChanGroup.Name to be the hostname, this might need to change.
ctx.Sample(fmt.Sprintf("points.%s.pending", seriesNames[i]), len(g.points[i]))
}
}
func (p *RiemannPoster) deliver(event *raidman.Event) {
ctx := slog.Context{}
defer func() { LogWithContext(ctx) }()
start := time.Now()
log.Printf("sending %#v\n", *event)
err := p.riemann.Send(event)
if err != nil {
log.Println(ctx, "delivery error, trying to reconnect:", err)
new_riemann, err := raidman.Dial("tcp", p.riemannAddress)
if err == nil {
log.Println("reconnected!")
p.riemann = new_riemann
} else {
log.Println("reconnection failed:", err)
}
}
ctx.MeasureSince("riemann_poster.time", start)
}
func main() {
ctx := slog.Context{}
ctx.Add("fixture", true)
fmt.Println(ctx)
}
// "Parse tree" from hell
func serveDrain(w http.ResponseWriter, r *http.Request) {
ctx := slog.Context{}
defer func() { LogWithContext(ctx) }()
w.Header().Set("Content-Length", "0")
if r.Method != "POST" {
w.WriteHeader(http.StatusMethodNotAllowed)
ctx.Count("errors.drain.wrong.method", 1)
return
}
id := r.Header.Get("Logplex-Drain-Token")
if id == "" {
if err := checkAuth(r); err != nil {
w.WriteHeader(http.StatusForbidden)
ctx.Count("errors.auth.failure", 1)
return
}
}
ctx.Count("batch", 1)
parseStart := time.Now()
lp := lpx.NewReader(bufio.NewReader(r.Body))
for lp.Next() {
ctx.Count("lines.total", 1)
header := lp.Header()
// If the syslog App Name Header field containts what looks like a log token,
// let's assume it's an override of the id and we're getting the data from the magic
// channel
if bytes.HasPrefix(header.Name, TokenPrefix) {
id = string(header.Name)
}
// If we still don't have an id, throw an error and try the next line
if id == "" {
ctx.Count("errors.token.missing", 1)
continue
}
chanGroup := hashRing.Get(id)
msg := lp.Bytes()
switch {
case bytes.Equal(header.Name, Heroku), bytes.HasPrefix(header.Name, TokenPrefix):
t, e := time.Parse("2006-01-02T15:04:05.000000+00:00", string(lp.Header().Time))
if e != nil {
log.Printf("Error Parsing Time(%s): %q\n", string(lp.Header().Time), e)
continue
}
timestamp := t.UnixNano() / int64(time.Microsecond)
pid := string(header.Procid)
switch pid {
case "router":
switch {
// router logs with a H error code in them
case bytes.Contains(msg, keyCodeH):
ctx.Count("lines.router.error", 1)
re := routerError{}
err := logfmt.Unmarshal(msg, &re)
if err != nil {
log.Printf("logfmt unmarshal error: %s\n", err)
continue
}
chanGroup.points[EventsRouter] <- []interface{}{timestamp, id, re.Code}
// likely a standard router log
default:
ctx.Count("lines.router", 1)
rm := routerMsg{}
err := logfmt.Unmarshal(msg, &rm)
if err != nil {
log.Printf("logfmt unmarshal error: %s\n", err)
continue
}
chanGroup.points[Router] <- []interface{}{timestamp, id, rm.Status, rm.Service}
}
// Non router logs, so either dynos, runtime, etc
default:
switch {
// Dyno error messages
case bytes.HasPrefix(msg, dynoErrorSentinel):
ctx.Count("lines.dyno.error", 1)
de, err := parseBytesToDynoError(msg)
if err != nil {
log.Printf("Unable to parse dyno error message: %q\n", err)
}
what := string(lp.Header().Procid)
chanGroup.points[EventsDyno] <- []interface{}{
timestamp,
id,
what,
"R",
de.Code,
string(msg),
dynoType(what),
}
// Dyno log-runtime-metrics memory messages
case bytes.Contains(msg, dynoMemMsgSentinel):
ctx.Count("lines.dyno.mem", 1)
dm := dynoMemMsg{}
err := logfmt.Unmarshal(msg, &dm)
if err != nil {
log.Printf("logfmt unmarshal error: %s\n", err)
continue
}
if dm.Source != "" {
chanGroup.points[DynoMem] <- []interface{}{
timestamp,
id,
dm.Source,
dm.MemoryCache,
dm.MemoryPgpgin,
dm.MemoryPgpgout,
dm.MemoryRSS,
dm.MemorySwap,
dm.MemoryTotal,
dynoType(dm.Source),
}
}
// Dyno log-runtime-metrics load messages
case bytes.Contains(msg, dynoLoadMsgSentinel):
ctx.Count("lines.dyno.load", 1)
dm := dynoLoadMsg{}
err := logfmt.Unmarshal(msg, &dm)
if err != nil {
log.Printf("logfmt unmarshal error: %s\n", err)
continue
}
if dm.Source != "" {
chanGroup.points[DynoLoad] <- []interface{}{
timestamp,
id,
dm.Source,
dm.LoadAvg1Min,
dm.LoadAvg5Min,
dm.LoadAvg15Min,
dynoType(dm.Source),
}
}
// unknown
default:
ctx.Count("lines.unknown.heroku", 1)
if Debug {
log.Printf("Unknown Heroku Line - Header: PRI: %s, Time: %s, Hostname: %s, Name: %s, ProcId: %s, MsgId: %s - Body: %s",
header.PrivalVersion,
header.Time,
header.Hostname,
header.Name,
header.Procid,
header.Msgid,
string(msg),
)
}
}
}
// non heroku lines
default:
ctx.Count("lines.unknown.user", 1)
if Debug {
log.Printf("Unknown User Line - Header: PRI: %s, Time: %s, Hostname: %s, Name: %s, ProcId: %s, MsgId: %s - Body: %s",
header.PrivalVersion,
header.Time,
header.Hostname,
header.Name,
header.Procid,
header.Msgid,
string(msg),
)
}
}
}
ctx.MeasureSince("lines.parse.time", parseStart)
// If we are told to close the connection after the reply, do so.
select {
case <-connectionCloser:
w.Header().Set("Connection", "close")
default:
//Nothing
}
w.WriteHeader(http.StatusNoContent)
}
func LogWithContext(ctx slog.Context) {
ctx.Add("app", "lumbermill")
log.Println(ctx)
}
func main() {
ctx := slog.Context{}
ctx.Count("hello", 1)
fmt.Println(ctx)
}