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client.go
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client.go
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package clientcfg
import (
"context"
"net/url"
"os"
"strings"
"sync"
"time"
"github.com/signalfx/golib/datapoint"
"github.com/signalfx/golib/distconf"
"github.com/signalfx/golib/errors"
"github.com/signalfx/golib/event"
"github.com/signalfx/golib/log"
"github.com/signalfx/golib/logkey"
"github.com/signalfx/golib/sfxclient"
"github.com/signalfx/golib/timekeeper"
"github.com/signalfx/golib/trace"
)
// ClientConfig configures a SfxClient
type ClientConfig struct {
SourceName *distconf.Str
AuthToken *distconf.Str
Endpoint *distconf.Str
ReportingInterval *distconf.Duration
ReportingTimeoutInterval *distconf.Duration
TimeKeeper timekeeper.TimeKeeper
OsHostname func() (name string, err error)
DisableCompression *distconf.Bool
DebugCollectDatapoints *distconf.Bool
}
// Load the client config values from distconf
func (c *ClientConfig) Load(d *distconf.Distconf) {
c.SourceName = d.Str("signalfuse.sourceName", "")
c.AuthToken = d.Str("sf.metrics.auth_token", "")
c.Endpoint = d.Str("sf.metrics.statsendpoint", "")
c.ReportingInterval = d.Duration("sf.metrics.report_interval", time.Second)
c.TimeKeeper = timekeeper.RealTime{}
c.OsHostname = os.Hostname
c.DisableCompression = d.Bool("sf.metrics.disableCompression", false)
c.ReportingTimeoutInterval = d.Duration("sf.metrics.report_timeout_interval", time.Second)
c.DebugCollectDatapoints = d.Bool("sf.metrics.debug.collect.datapoints", false)
}
// DefaultDimensions extracts default sfxclient dimensions that identify the host
func DefaultDimensions(conf *ClientConfig) (map[string]string, error) {
signalfuseSourceName := conf.SourceName.Get()
if signalfuseSourceName != "" {
return map[string]string{"sf_source": signalfuseSourceName}, nil
}
hostname, err := conf.OsHostname()
if err != nil {
return nil, errors.Annotate(err, "unable to get hostname for default source")
}
return map[string]string{"sf_source": hostname}, nil
}
// ClientConfigChangerSink is a sink that can update auth and endpoint values
type ClientConfigChangerSink struct {
Destination *sfxclient.HTTPSink
mu sync.RWMutex
logger log.Logger
urlParse func(string) (url *url.URL, err error)
}
// WatchSinkChanges returns a new ClientConfigChangerSink that wraps a sink with auth/endpoint changes from distconf
func WatchSinkChanges(sink sfxclient.Sink, Conf *ClientConfig, logger log.Logger) sfxclient.Sink {
httpSink, ok := sink.(*sfxclient.HTTPSink)
if !ok {
return sink
}
return WatchHTTPSinkChange(httpSink, Conf, logger)
}
// WatchHTTPSinkChange returns anew ClientConfigChangerSink that takes an http sink, instead of a regular sinc
func WatchHTTPSinkChange(httpSink *sfxclient.HTTPSink, Conf *ClientConfig, logger log.Logger) *ClientConfigChangerSink {
ret := &ClientConfigChangerSink{
Destination: httpSink,
urlParse: url.Parse,
logger: logger,
}
ret.authTokenWatch(Conf.AuthToken, "")
ret.endpointWatch(Conf.Endpoint, "")
ret.disableCompressionWatch(Conf.DisableCompression, false)
Conf.Endpoint.Watch(ret.endpointWatch)
Conf.AuthToken.Watch(ret.authTokenWatch)
Conf.DisableCompression.Watch(ret.disableCompressionWatch)
return ret
}
// AddDatapoints forwards the call to Destination
func (s *ClientConfigChangerSink) AddDatapoints(ctx context.Context, points []*datapoint.Datapoint) error {
s.mu.RLock()
defer s.mu.RUnlock()
return s.Destination.AddDatapoints(ctx, points)
}
// AddSpans forwards the call to Destination
func (s *ClientConfigChangerSink) AddSpans(ctx context.Context, spans []*trace.Span) error {
s.mu.RLock()
defer s.mu.RUnlock()
return s.Destination.AddSpans(ctx, spans)
}
// AddEvents forwards the call to Destination
func (s *ClientConfigChangerSink) AddEvents(ctx context.Context, events []*event.Event) error {
s.mu.RLock()
defer s.mu.RUnlock()
return s.Destination.AddEvents(ctx, events)
}
func (s *ClientConfigChangerSink) disableCompressionWatch(new *distconf.Bool, old bool) {
s.logger.Log("disableCompression watch")
s.mu.Lock()
s.Destination.DisableCompression = new.Get()
s.mu.Unlock()
}
func (s *ClientConfigChangerSink) authTokenWatch(str *distconf.Str, oldValue string) {
s.logger.Log("auth watch")
s.mu.Lock()
s.Destination.AuthToken = str.Get()
s.mu.Unlock()
}
// endpointWatch returns a distconf watch that sets the correct ingest endpoint for a signalfx
// client
func (s *ClientConfigChangerSink) endpointWatch(str *distconf.Str, oldValue string) {
s.logger.Log("endpoint watch")
e := str.Get()
if e == "" {
return
}
if !strings.HasPrefix(e, "http") {
e = "http://" + e
}
u, err := s.urlParse(e)
if err != nil {
s.logger.Log(logkey.Endpoint, e, log.Err, err, "unable to parse URL")
return
}
if u.Path == "" {
u.Path = "/v2/datapoint"
}
if e != "" {
s.logger.Log(logkey.Endpoint, e, logkey.URL, u, "updating reporter endpoint")
s.mu.Lock()
s.Destination.DatapointEndpoint = u.String()
s.mu.Unlock()
}
}