forked from nytimes/gizmo
/
sd_log.go
193 lines (174 loc) · 4.39 KB
/
sd_log.go
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package kit
import (
"context"
"encoding"
"encoding/json"
"fmt"
"reflect"
"strings"
"cloud.google.com/go/logging"
"contrib.go.opencensus.io/exporter/stackdriver/monitoredresource"
"github.com/NYTimes/gizmo/observe"
"github.com/go-kit/kit/log"
"github.com/go-kit/kit/log/level"
"github.com/pkg/errors"
"google.golang.org/genproto/googleapis/api/monitoredres"
)
type sdLogger struct {
project string
monRes *monitoredres.MonitoredResource
lc *logging.Client
lgr *logging.Logger
}
func newStackdriverLogger(ctx context.Context, logID, projectID, service, version string) (log.Logger, func() error, error) {
resource := &monitoredres.MonitoredResource{
Labels: map[string]string{
"module_id": service,
"project_id": projectID,
"version_id": version,
},
}
if observe.IsGAE() {
resource.Type = "gae_app"
if logID == "" {
logID = "app_logs"
}
} else if observe.IsCloudRun() {
resource.Type = "cloud_run_revision"
if logID == "" {
logID = "stdout"
}
} else if mr := monitoredresource.Autodetect(); mr != nil {
typ, lbls := mr.MonitoredResource()
for f, v := range lbls {
resource.Labels[f] = v
}
resource.Type = typ
if logID == "" {
logID = "stdout"
}
} else {
return nil, nil, errors.New("unable to find monitored resource")
}
client, err := logging.NewClient(ctx, fmt.Sprintf("projects/%s", projectID))
if err != nil {
return nil, nil, errors.Wrap(err, "unable to initiate stackdriver log client")
}
return sdLogger{
lc: client,
lgr: client.Logger(logID),
project: projectID,
monRes: resource,
}, client.Close, nil
}
func (l sdLogger) Log(keyvals ...interface{}) error {
kvs, lvl, traceContext := logKeyValsToMap(keyvals...)
var traceID string
if traceContext != "" {
traceID = l.getTraceID(traceContext)
}
svrty := logging.Default
switch lvl {
case level.DebugValue():
svrty = logging.Debug
case level.ErrorValue():
svrty = logging.Error
case level.InfoValue():
svrty = logging.Info
case level.WarnValue():
svrty = logging.Warning
}
payload, err := json.Marshal(kvs)
if err != nil {
return err
}
l.lgr.Log(logging.Entry{
Severity: svrty,
Payload: json.RawMessage(payload),
Trace: traceID,
Resource: l.monRes,
})
return nil
}
func (l sdLogger) getTraceID(traceCtx string) string {
return "projects/" + l.project + "/traces/" + strings.Split(traceCtx, "/")[0]
}
const cloudTraceLogKey = "cloud-trace"
///////////////////////////////////////////////////
// below funcs are straight up copied out of go-kit/kit/log:
// https://github.com/go-kit/kit/blob/master/log/json_logger.go
// we needed the magic for keyvals => map[string]interface{} but we're doing the
// writing the JSON ourselves
///////////////////////////////////////////////////
func logKeyValsToMap(keyvals ...interface{}) (map[string]interface{}, level.Value, string) {
var (
lvl level.Value
traceContext string
)
n := (len(keyvals) + 1) / 2 // +1 to handle case when len is odd
m := make(map[string]interface{}, n)
for i := 0; i < len(keyvals); i += 2 {
k := keyvals[i]
var v interface{} = log.ErrMissingValue
if i+1 < len(keyvals) {
v = keyvals[i+1]
}
merge(m, k, v)
if k == cloudTraceLogKey {
traceContext = v.(string)
}
if k == level.Key() {
lvl = v.(level.Value)
}
}
return m, lvl, traceContext
}
func merge(dst map[string]interface{}, k, v interface{}) {
var key string
switch x := k.(type) {
case string:
key = x
case fmt.Stringer:
key = safeString(x)
default:
key = fmt.Sprint(x)
}
// We want json.Marshaler and encoding.TextMarshaller to take priority over
// err.Error() and v.String(). But json.Marshall (called later) does that by
// default so we force a no-op if it's one of those 2 case.
switch x := v.(type) {
case json.Marshaler:
case encoding.TextMarshaler:
case error:
v = safeError(x)
case fmt.Stringer:
v = safeString(x)
}
dst[key] = v
}
func safeString(str fmt.Stringer) (s string) {
defer func() {
if panicVal := recover(); panicVal != nil {
if v := reflect.ValueOf(str); v.Kind() == reflect.Ptr && v.IsNil() {
s = "NULL"
} else {
panic(panicVal)
}
}
}()
s = str.String()
return
}
func safeError(err error) (s interface{}) {
defer func() {
if panicVal := recover(); panicVal != nil {
if v := reflect.ValueOf(err); v.Kind() == reflect.Ptr && v.IsNil() {
s = nil
} else {
panic(panicVal)
}
}
}()
s = err.Error()
return
}