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graph.go
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graph.go
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// Copyright (c) 2019 Uber Technologies, Inc.
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
package observability
import (
"context"
"sync"
"time"
"go.uber.org/net/metrics"
"go.uber.org/net/metrics/bucket"
"go.uber.org/yarpc/api/transport"
"go.uber.org/yarpc/internal/digester"
"go.uber.org/zap"
"go.uber.org/zap/zapcore"
)
var (
_timeNow = time.Now // for tests
_defaultGraphSize = 128
// Latency buckets for histograms. At some point, we may want to make these
// configurable.
_bucketsMs = bucket.NewRPCLatency()
)
type directionName string
const (
_directionOutbound directionName = "outbound"
_directionInbound directionName = "inbound"
)
// A graph represents a collection of services: each service is a node, and we
// collect stats for each caller-callee-transport-encoding-procedure-rk-sk-rd edge.
type graph struct {
meter *metrics.Scope
logger *zap.Logger
extract ContextExtractor
edgesMu sync.RWMutex
edges map[string]*edge
inboundLevels, outboundLevels levels
}
func newGraph(meter *metrics.Scope, logger *zap.Logger, extract ContextExtractor) graph {
return graph{
edges: make(map[string]*edge, _defaultGraphSize),
meter: meter,
logger: logger,
extract: extract,
inboundLevels: levels{
success: zapcore.DebugLevel,
failure: zapcore.ErrorLevel,
applicationError: zapcore.ErrorLevel,
},
outboundLevels: levels{
success: zapcore.DebugLevel,
failure: zapcore.ErrorLevel,
applicationError: zapcore.ErrorLevel,
},
}
}
// begin starts a call along an edge.
func (g *graph) begin(ctx context.Context, rpcType transport.Type, direction directionName, req *transport.Request) call {
now := _timeNow()
d := digester.New()
d.Add(req.Caller)
d.Add(req.Service)
d.Add(req.Transport)
d.Add(string(req.Encoding))
d.Add(req.Procedure)
d.Add(req.RoutingKey)
d.Add(req.RoutingDelegate)
d.Add(string(direction))
d.Add(rpcType.String())
e := g.getOrCreateEdge(d.Digest(), req, string(direction), rpcType)
d.Free()
levels := &g.inboundLevels
if direction != _directionInbound {
levels = &g.outboundLevels
}
return call{
edge: e,
extract: g.extract,
started: now,
ctx: ctx,
req: req,
rpcType: rpcType,
direction: direction,
levels: levels,
}
}
func (g *graph) getOrCreateEdge(key []byte, req *transport.Request, direction string, rpcType transport.Type) *edge {
if e := g.getEdge(key); e != nil {
return e
}
return g.createEdge(key, req, direction, rpcType)
}
func (g *graph) getEdge(key []byte) *edge {
g.edgesMu.RLock()
e := g.edges[string(key)]
g.edgesMu.RUnlock()
return e
}
func (g *graph) createEdge(key []byte, req *transport.Request, direction string, rpcType transport.Type) *edge {
g.edgesMu.Lock()
// Since we'll rarely hit this code path, the overhead of defer is acceptable.
defer g.edgesMu.Unlock()
if e, ok := g.edges[string(key)]; ok {
// Someone beat us to the punch.
return e
}
e := newEdge(g.logger, g.meter, req, direction, rpcType)
g.edges[string(key)] = e
return e
}
// An edge is a collection of RPC stats for a particular
// caller-callee-encoding-procedure-sk-rd-rk edge in the service graph.
type edge struct {
logger *zap.Logger
calls *metrics.Counter
successes *metrics.Counter
callerFailures *metrics.CounterVector
serverFailures *metrics.CounterVector
latencies *metrics.Histogram
callerErrLatencies *metrics.Histogram
serverErrLatencies *metrics.Histogram
streaming *streamEdge
}
// streamEdge metrics should only be used for streaming requests.
type streamEdge struct {
sends *metrics.Counter
sendSuccesses *metrics.Counter
sendFailures *metrics.CounterVector
receives *metrics.Counter
receiveSuccesses *metrics.Counter
receiveFailures *metrics.CounterVector
streamDurations *metrics.Histogram
streamsActive *metrics.Gauge
}
// newEdge constructs a new edge. Since Registries enforce metric uniqueness,
// edges should be cached and re-used for each RPC.
func newEdge(logger *zap.Logger, meter *metrics.Scope, req *transport.Request, direction string, rpcType transport.Type) *edge {
tags := metrics.Tags{
"source": req.Caller,
"dest": req.Service,
"transport": unknownIfEmpty(req.Transport),
"procedure": req.Procedure,
"encoding": string(req.Encoding),
"routing_key": req.RoutingKey,
"routing_delegate": req.RoutingDelegate,
"direction": direction,
"rpc_type": rpcType.String(),
}
// metrics for all RPCs
calls, err := meter.Counter(metrics.Spec{
Name: "calls",
Help: "Total number of RPCs.",
ConstTags: tags,
})
if err != nil {
logger.Error("Failed to create calls counter.", zap.Error(err))
}
successes, err := meter.Counter(metrics.Spec{
Name: "successes",
Help: "Number of successful RPCs.",
ConstTags: tags,
})
if err != nil {
logger.Error("Failed to create successes counter.", zap.Error(err))
}
callerFailures, err := meter.CounterVector(metrics.Spec{
Name: "caller_failures",
Help: "Number of RPCs failed because of caller error.",
ConstTags: tags,
VarTags: []string{_error},
})
if err != nil {
logger.Error("Failed to create caller failures vector.", zap.Error(err))
}
serverFailures, err := meter.CounterVector(metrics.Spec{
Name: "server_failures",
Help: "Number of RPCs failed because of server error.",
ConstTags: tags,
VarTags: []string{_error},
})
if err != nil {
logger.Error("Failed to create server failures vector.", zap.Error(err))
}
// metrics for only unary and oneway
var latencies, callerErrLatencies, serverErrLatencies *metrics.Histogram
if rpcType == transport.Unary || rpcType == transport.Oneway {
latencies, err = meter.Histogram(metrics.HistogramSpec{
Spec: metrics.Spec{
Name: "success_latency_ms",
Help: "Latency distribution of successful RPCs.",
ConstTags: tags,
},
Unit: time.Millisecond,
Buckets: _bucketsMs,
})
if err != nil {
logger.Error("Failed to create success latency distribution.", zap.Error(err))
}
callerErrLatencies, err = meter.Histogram(metrics.HistogramSpec{
Spec: metrics.Spec{
Name: "caller_failure_latency_ms",
Help: "Latency distribution of RPCs failed because of caller error.",
ConstTags: tags,
},
Unit: time.Millisecond,
Buckets: _bucketsMs,
})
if err != nil {
logger.Error("Failed to create caller failure latency distribution.", zap.Error(err))
}
serverErrLatencies, err = meter.Histogram(metrics.HistogramSpec{
Spec: metrics.Spec{
Name: "server_failure_latency_ms",
Help: "Latency distribution of RPCs failed because of server error.",
ConstTags: tags,
},
Unit: time.Millisecond,
Buckets: _bucketsMs,
})
if err != nil {
logger.Error("Failed to create server failure latency distribution.", zap.Error(err))
}
}
// metrics for only streams
var streaming *streamEdge
if rpcType == transport.Streaming {
// sends
sends, err := meter.Counter(metrics.Spec{
Name: "stream_sends",
Help: "Total number of streaming messages sent.",
ConstTags: tags,
})
if err != nil {
logger.DPanic("Failed to create streaming sends counter.", zap.Error(err))
}
sendSuccesses, err := meter.Counter(metrics.Spec{
Name: "stream_send_successes",
Help: "Number of successful streaming messages sent.",
ConstTags: tags,
})
if err != nil {
logger.DPanic("Failed to create streaming sends successes counter.", zap.Error(err))
}
sendFailures, err := meter.CounterVector(metrics.Spec{
Name: "stream_send_failures",
Help: "Number streaming messages that failed to send.",
ConstTags: tags,
VarTags: []string{_error},
})
if err != nil {
logger.DPanic("Failed to create streaming sends failure counter.", zap.Error(err))
}
// receives
receives, err := meter.Counter(metrics.Spec{
Name: "stream_receives",
Help: "Total number of streaming messages recevied.",
ConstTags: tags,
})
if err != nil {
logger.DPanic("Failed to create streaming receives counter.", zap.Error(err))
}
receiveSuccesses, err := meter.Counter(metrics.Spec{
Name: "stream_receive_successes",
Help: "Number of successful streaming messages received.",
ConstTags: tags,
})
if err != nil {
logger.DPanic("Failed to create streaming receives successes counter.", zap.Error(err))
}
receiveFailures, err := meter.CounterVector(metrics.Spec{
Name: "stream_receive_failures",
Help: "Number streaming messages failed to be recieved.",
ConstTags: tags,
VarTags: []string{_error},
})
if err != nil {
logger.DPanic("Failed to create streaming receives failure counter.", zap.Error(err))
}
// entire stream
streamDurations, err := meter.Histogram(metrics.HistogramSpec{
Spec: metrics.Spec{
Name: "stream_duration_ms",
Help: "Latency distribution of total stream duration.",
ConstTags: tags,
},
Unit: time.Millisecond,
Buckets: _bucketsMs,
})
if err != nil {
logger.DPanic("Failed to create stream duration histogram.", zap.Error(err))
}
streamsActive, err := meter.Gauge(metrics.Spec{
Name: "streams_active",
Help: "Number of active streams.",
ConstTags: tags,
})
if err != nil {
logger.DPanic("Failed to create active stream gauge.", zap.Error(err))
}
streaming = &streamEdge{
sends: sends,
sendSuccesses: sendSuccesses,
sendFailures: sendFailures,
receives: receives,
receiveSuccesses: receiveSuccesses,
receiveFailures: receiveFailures,
streamDurations: streamDurations,
streamsActive: streamsActive,
}
}
logger = logger.With(
zap.String("source", req.Caller),
zap.String("dest", req.Service),
zap.String("transport", unknownIfEmpty(req.Transport)),
zap.String("procedure", req.Procedure),
zap.String("encoding", string(req.Encoding)),
zap.String("routingKey", req.RoutingKey),
zap.String("routingDelegate", req.RoutingDelegate),
zap.String("direction", direction),
)
return &edge{
logger: logger,
calls: calls,
successes: successes,
callerFailures: callerFailures,
serverFailures: serverFailures,
latencies: latencies,
callerErrLatencies: callerErrLatencies,
serverErrLatencies: serverErrLatencies,
streaming: streaming,
}
}
// unknownIfEmpty works around hard-coded default value of "default" in go.uber.org/net/metrics
func unknownIfEmpty(t string) string {
if t == "" {
t = "unknown"
}
return t
}