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Support NX-OS telemetry extensions in cisco_telemetry_mdt (#6177)

This commit is contained in:
Steven Barth 2019-09-17 01:57:25 +02:00 committed by Daniel Nelson
parent b5510eb128
commit ee9d0fc493
4 changed files with 466 additions and 88 deletions
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2
Gopkg.lock generated
View File

@ -1486,6 +1486,7 @@
"credentials",
"credentials/oauth",
"encoding",
"encoding/gzip",
"encoding/proto",
"grpclog",
"internal",
@ -1813,6 +1814,7 @@
"google.golang.org/grpc",
"google.golang.org/grpc/codes",
"google.golang.org/grpc/credentials",
"google.golang.org/grpc/encoding/gzip",
"google.golang.org/grpc/metadata",
"google.golang.org/grpc/peer",
"google.golang.org/grpc/status",

3
plugins/inputs/cisco_telemetry_mdt/README.md
View File

@ -29,6 +29,9 @@ The TCP dialout transport is supported on IOS XR (32-bit and 64-bit) 6.1.x and l
## transport only.
# tls_allowed_cacerts = ["/etc/telegraf/clientca.pem"]
## Define (for certain nested telemetry measurements with embedded tags) which fields are tags
# embedded_tags = ["Cisco-IOS-XR-qos-ma-oper:qos/interface-table/interface/input/service-policy-names/service-policy-instance/statistics/class-stats/class-name"]
## Define aliases to map telemetry encoding paths to simple measurement names
[inputs.cisco_telemetry_mdt.aliases]
ifstats = "ietf-interfaces:interfaces-state/interface/statistics"

305
plugins/inputs/cisco_telemetry_mdt/cisco_telemetry_mdt.go
View File

@ -7,10 +7,14 @@ import (
"io"
"log"
"net"
"path"
"strconv"
"strings"
"sync"
"time"
"github.com/influxdata/telegraf/metric"
dialout "github.com/cisco-ie/nx-telemetry-proto/mdt_dialout"
telemetry "github.com/cisco-ie/nx-telemetry-proto/telemetry_bis"
"github.com/golang/protobuf/proto"
@ -19,6 +23,9 @@ import (
"github.com/influxdata/telegraf/plugins/inputs"
"google.golang.org/grpc"
"google.golang.org/grpc/credentials"
// Register GRPC gzip decoder to support compressed telemetry
_ "google.golang.org/grpc/encoding/gzip"
"google.golang.org/grpc/peer"
)
@ -34,6 +41,7 @@ type CiscoTelemetryMDT struct {
ServiceAddress string `toml:"service_address"`
MaxMsgSize int `toml:"max_msg_size"`
Aliases map[string]string `toml:"aliases"`
EmbeddedTags []string `toml:"embedded_tags"`
// GRPC TLS settings
internaltls.ServerConfig
@ -43,9 +51,12 @@ type CiscoTelemetryMDT struct {
listener net.Listener
// Internal state
aliases map[string]string
acc telegraf.Accumulator
wg sync.WaitGroup
aliases map[string]string
warned map[string]struct{}
extraTags map[string]map[string]struct{}
mutex sync.Mutex
acc telegraf.Accumulator
wg sync.WaitGroup
}
// Start the Cisco MDT service
@ -58,11 +69,22 @@ func (c *CiscoTelemetryMDT) Start(acc telegraf.Accumulator) error {
}
// Invert aliases list
c.warned = make(map[string]struct{})
c.aliases = make(map[string]string, len(c.Aliases))
for alias, path := range c.Aliases {
c.aliases[path] = alias
}
// Fill extra tags
c.extraTags = make(map[string]map[string]struct{})
for _, tag := range c.EmbeddedTags {
dir := path.Dir(tag)
if _, hasKey := c.extraTags[dir]; !hasKey {
c.extraTags[dir] = make(map[string]struct{})
}
c.extraTags[dir][path.Base(tag)] = struct{}{}
}
switch c.Transport {
case "tcp":
// TCP dialout server accept routine
@ -76,6 +98,7 @@ func (c *CiscoTelemetryMDT) Start(acc telegraf.Accumulator) error {
var opts []grpc.ServerOption
tlsConfig, err := c.ServerConfig.TLSConfig()
if err != nil {
c.listener.Close()
return err
} else if tlsConfig != nil {
opts = append(opts, grpc.Creds(credentials.NewTLS(tlsConfig)))
@ -198,6 +221,8 @@ func (c *CiscoTelemetryMDT) MdtDialout(stream dialout.GRPCMdtDialout_MdtDialoutS
log.Printf("D! [inputs.cisco_telemetry_mdt]: Accepted Cisco MDT GRPC dialout connection from %s", peer.Addr)
}
var chunkBuffer bytes.Buffer
for {
packet, err := stream.Recv()
if err != nil {
@ -212,7 +237,18 @@ func (c *CiscoTelemetryMDT) MdtDialout(stream dialout.GRPCMdtDialout_MdtDialoutS
break
}
c.handleTelemetry(packet.Data)
// Reassemble chunked telemetry data received from NX-OS
if packet.TotalSize == 0 {
c.handleTelemetry(packet.Data)
} else if int(packet.TotalSize) <= c.MaxMsgSize {
chunkBuffer.Write(packet.Data)
if chunkBuffer.Len() >= int(packet.TotalSize) {
c.handleTelemetry(chunkBuffer.Bytes())
chunkBuffer.Reset()
}
} else {
c.acc.AddError(fmt.Errorf("dropped too large packet: %dB > %dB", packet.TotalSize, c.MaxMsgSize))
}
}
if peerOK {
@ -224,115 +260,239 @@ func (c *CiscoTelemetryMDT) MdtDialout(stream dialout.GRPCMdtDialout_MdtDialoutS
// Handle telemetry packet from any transport, decode and add as measurement
func (c *CiscoTelemetryMDT) handleTelemetry(data []byte) {
var namebuf bytes.Buffer
telemetry := &telemetry.Telemetry{}
err := proto.Unmarshal(data, telemetry)
msg := &telemetry.Telemetry{}
err := proto.Unmarshal(data, msg)
if err != nil {
c.acc.AddError(fmt.Errorf("Cisco MDT failed to decode: %v", err))
return
}
for _, gpbkv := range telemetry.DataGpbkv {
var fields map[string]interface{}
grouper := metric.NewSeriesGrouper()
for _, gpbkv := range msg.DataGpbkv {
// Produce metadata tags
var tags map[string]string
// Top-level field may have measurement timestamp, if not use message timestamp
measured := gpbkv.Timestamp
if measured == 0 {
measured = telemetry.MsgTimestamp
measured = msg.MsgTimestamp
}
timestamp := time.Unix(int64(measured/1000), int64(measured%1000)*1000000)
// Populate tags and fields from toplevel GPBKV fields "keys" and "content"
// Find toplevel GPBKV fields "keys" and "content"
var keys, content *telemetry.TelemetryField = nil, nil
for _, field := range gpbkv.Fields {
switch field.Name {
case "keys":
tags = make(map[string]string, len(field.Fields)+2)
tags["source"] = telemetry.GetNodeIdStr()
tags["subscription"] = telemetry.GetSubscriptionIdStr()
for _, subfield := range field.Fields {
c.parseGPBKVField(subfield, &namebuf, telemetry.EncodingPath, timestamp, tags, nil)
}
case "content":
fields = make(map[string]interface{}, len(field.Fields))
for _, subfield := range field.Fields {
c.parseGPBKVField(subfield, &namebuf, telemetry.EncodingPath, timestamp, tags, fields)
}
default:
log.Printf("I! [inputs.cisco_telemetry_mdt]: Unexpected top-level MDT field: %s", field.Name)
if field.Name == "keys" {
keys = field
} else if field.Name == "content" {
content = field
}
}
// Find best alias for encoding path and emit measurement
if len(fields) > 0 && len(tags) > 0 && len(telemetry.EncodingPath) > 0 {
name := telemetry.EncodingPath
if alias, ok := c.aliases[name]; ok {
tags["path"] = name
name = alias
} else {
log.Printf("D! [inputs.cisco_telemetry_mdt]: No measurement alias for encoding path: %s", name)
}
c.acc.AddFields(name, fields, tags, timestamp)
} else {
c.acc.AddError(fmt.Errorf("empty encoding path or measurement"))
if keys == nil || content == nil {
log.Printf("I! [inputs.cisco_telemetry_mdt]: Message from %s missing keys or content", msg.GetNodeIdStr())
continue
}
// Parse keys
tags = make(map[string]string, len(keys.Fields)+3)
tags["source"] = msg.GetNodeIdStr()
tags["subscription"] = msg.GetSubscriptionIdStr()
tags["path"] = msg.GetEncodingPath()
for _, subfield := range keys.Fields {
c.parseKeyField(tags, subfield, "")
}
// Parse values
for _, subfield := range content.Fields {
c.parseContentField(grouper, subfield, "", msg.EncodingPath, tags, timestamp)
}
}
for _, metric := range grouper.Metrics() {
c.acc.AddMetric(metric)
}
}
// Recursively parse GPBKV field structure into fields or tags
func (c *CiscoTelemetryMDT) parseGPBKVField(field *telemetry.TelemetryField, namebuf *bytes.Buffer,
path string, timestamp time.Time, tags map[string]string, fields map[string]interface{}) {
namelen := namebuf.Len()
if namelen > 0 {
namebuf.WriteRune('/')
}
namebuf.WriteString(strings.Replace(field.Name, "-", "_", -1))
// Decode Telemetry field value if set
var value interface{}
func decodeValue(field *telemetry.TelemetryField) interface{} {
switch val := field.ValueByType.(type) {
case *telemetry.TelemetryField_BytesValue:
value = val.BytesValue
return val.BytesValue
case *telemetry.TelemetryField_StringValue:
value = val.StringValue
if len(val.StringValue) > 0 {
return val.StringValue
}
case *telemetry.TelemetryField_BoolValue:
value = val.BoolValue
return val.BoolValue
case *telemetry.TelemetryField_Uint32Value:
value = val.Uint32Value
return val.Uint32Value
case *telemetry.TelemetryField_Uint64Value:
value = val.Uint64Value
return val.Uint64Value
case *telemetry.TelemetryField_Sint32Value:
value = val.Sint32Value
return val.Sint32Value
case *telemetry.TelemetryField_Sint64Value:
value = val.Sint64Value
return val.Sint64Value
case *telemetry.TelemetryField_DoubleValue:
value = val.DoubleValue
return val.DoubleValue
case *telemetry.TelemetryField_FloatValue:
value = val.FloatValue
return val.FloatValue
}
return nil
}
func decodeTag(field *telemetry.TelemetryField) string {
switch val := field.ValueByType.(type) {
case *telemetry.TelemetryField_BytesValue:
return string(val.BytesValue)
case *telemetry.TelemetryField_StringValue:
return val.StringValue
case *telemetry.TelemetryField_BoolValue:
if val.BoolValue {
return "true"
}
return "false"
case *telemetry.TelemetryField_Uint32Value:
return strconv.FormatUint(uint64(val.Uint32Value), 10)
case *telemetry.TelemetryField_Uint64Value:
return strconv.FormatUint(val.Uint64Value, 10)
case *telemetry.TelemetryField_Sint32Value:
return strconv.FormatInt(int64(val.Sint32Value), 10)
case *telemetry.TelemetryField_Sint64Value:
return strconv.FormatInt(val.Sint64Value, 10)
case *telemetry.TelemetryField_DoubleValue:
return strconv.FormatFloat(val.DoubleValue, 'f', -1, 64)
case *telemetry.TelemetryField_FloatValue:
return strconv.FormatFloat(float64(val.FloatValue), 'f', -1, 32)
default:
return ""
}
}
// Recursively parse tag fields
func (c *CiscoTelemetryMDT) parseKeyField(tags map[string]string, field *telemetry.TelemetryField, prefix string) {
localname := strings.Replace(field.Name, "-", "_", -1)
name := localname
if len(localname) == 0 {
name = prefix
} else if len(prefix) > 0 {
name = prefix + "/" + localname
}
if value != nil {
// Distinguish between tags (keys) and fields (data) to write to
if fields != nil {
fields[namebuf.String()] = value
if tag := decodeTag(field); len(name) > 0 && len(tag) > 0 {
if _, exists := tags[localname]; !exists { // Use short keys whenever possible
tags[localname] = tag
} else {
if _, exists := tags[field.Name]; !exists { // Use short keys whenever possible
tags[field.Name] = fmt.Sprint(value)
} else {
tags[namebuf.String()] = fmt.Sprint(value)
}
tags[name] = tag
}
}
for _, subfield := range field.Fields {
c.parseGPBKVField(subfield, namebuf, path, timestamp, tags, fields)
c.parseKeyField(tags, subfield, name)
}
}
func (c *CiscoTelemetryMDT) parseContentField(grouper *metric.SeriesGrouper, field *telemetry.TelemetryField, prefix string,
path string, tags map[string]string, timestamp time.Time) {
name := strings.Replace(field.Name, "-", "_", -1)
if len(name) == 0 {
name = prefix
} else if len(prefix) > 0 {
name = prefix + "/" + name
}
namebuf.Truncate(namelen)
extraTags := c.extraTags[path+"/"+name]
if value := decodeValue(field); value != nil {
// Do alias lookup, to shorten measurement names
measurement := path
if alias, ok := c.aliases[path]; ok {
measurement = alias
} else {
c.mutex.Lock()
if _, haveWarned := c.warned[path]; !haveWarned {
log.Printf("D! [inputs.cisco_telemetry_mdt]: No measurement alias for encoding path: %s", path)
c.warned[path] = struct{}{}
}
c.mutex.Unlock()
}
grouper.Add(measurement, tags, timestamp, name, value)
return
}
if len(extraTags) > 0 {
for _, subfield := range field.Fields {
if _, isExtraTag := extraTags[subfield.Name]; isExtraTag {
tags[name+"/"+subfield.Name] = decodeTag(subfield)
}
}
}
var nxAttributes, nxChildren, nxRows *telemetry.TelemetryField
isNXOS := !strings.ContainsRune(path, ':') // IOS-XR and IOS-XE have a colon in their encoding path, NX-OS does not
for _, subfield := range field.Fields {
if isNXOS && subfield.Name == "attributes" && len(subfield.Fields) > 0 {
nxAttributes = subfield.Fields[0]
} else if isNXOS && subfield.Name == "children" && len(subfield.Fields) > 0 {
nxChildren = subfield
} else if isNXOS && strings.HasPrefix(subfield.Name, "ROW_") {
nxRows = subfield
} else if _, isExtraTag := extraTags[subfield.Name]; !isExtraTag { // Regular telemetry decoding
c.parseContentField(grouper, subfield, name, path, tags, timestamp)
}
}
if nxAttributes == nil && nxRows == nil {
return
} else if nxRows != nil {
// NXAPI structure: https://developer.cisco.com/docs/cisco-nexus-9000-series-nx-api-cli-reference-release-9-2x/
for _, row := range nxRows.Fields {
for i, subfield := range row.Fields {
if i == 0 { // First subfield contains the index, promote it from value to tag
tags[prefix] = decodeTag(subfield)
} else {
c.parseContentField(grouper, subfield, "", path, tags, timestamp)
}
}
delete(tags, prefix)
}
return
}
// DME structure: https://developer.cisco.com/site/nxapi-dme-model-reference-api/
rn := ""
dn := false
for _, subfield := range nxAttributes.Fields {
if subfield.Name == "rn" {
rn = decodeTag(subfield)
} else if subfield.Name == "dn" {
dn = true
}
}
if len(rn) > 0 {
tags[prefix] = rn
} else if !dn { // Check for distinguished name being present
c.acc.AddError(fmt.Errorf("NX-OS decoding failed: missing dn field"))
return
}
for _, subfield := range nxAttributes.Fields {
if subfield.Name != "rn" {
c.parseContentField(grouper, subfield, "", path, tags, timestamp)
}
}
if nxChildren != nil {
// This is a nested structure, children will inherit relative name keys of parent
for _, subfield := range nxChildren.Fields {
c.parseContentField(grouper, subfield, prefix, path, tags, timestamp)
}
}
delete(tags, prefix)
}
// Stop listener and cleanup
@ -363,6 +523,9 @@ const sampleConfig = `
## transport only.
# tls_allowed_cacerts = ["/etc/telegraf/clientca.pem"]
## Define (for certain nested telemetry measurements with embedded tags) which fields are tags
# embedded_tags = ["Cisco-IOS-XR-qos-ma-oper:qos/interface-table/interface/input/service-policy-names/service-policy-instance/statistics/class-stats/class-name"]
## Define aliases to map telemetry encoding paths to simple measurement names
[inputs.cisco_telemetry_mdt.aliases]
ifstats = "ietf-interfaces:interfaces-state/interface/statistics"

244
plugins/inputs/cisco_telemetry_mdt/cisco_telemetry_mdt_test.go
View File

@ -17,23 +17,6 @@ import (
"google.golang.org/grpc"
)
func TestHandleTelemetryEmpty(t *testing.T) {
c := &CiscoTelemetryMDT{Transport: "dummy"}
acc := &testutil.Accumulator{}
c.Start(acc)
telemetry := &telemetry.Telemetry{
DataGpbkv: []*telemetry.TelemetryField{
{},
},
}
data, _ := proto.Marshal(telemetry)
c.handleTelemetry(data)
assert.Contains(t, acc.Errors, errors.New("empty encoding path or measurement"))
assert.Empty(t, acc.Metrics)
}
func TestHandleTelemetryTwoSimple(t *testing.T) {
c := &CiscoTelemetryMDT{Transport: "dummy", Aliases: map[string]string{"alias": "type:model/some/path"}}
acc := &testutil.Accumulator{}
@ -174,6 +157,233 @@ func TestHandleTelemetrySingleNested(t *testing.T) {
acc.AssertContainsTaggedFields(t, "nested", fields, tags)
}
func TestHandleEmbeddedTags(t *testing.T) {
c := &CiscoTelemetryMDT{Transport: "dummy", Aliases: map[string]string{"extra": "type:model/extra"}, EmbeddedTags: []string{"type:model/extra/list/name"}}
acc := &testutil.Accumulator{}
c.Start(acc)
telemetry := &telemetry.Telemetry{
MsgTimestamp: 1543236572000,
EncodingPath: "type:model/extra",
NodeId: &telemetry.Telemetry_NodeIdStr{NodeIdStr: "hostname"},
Subscription: &telemetry.Telemetry_SubscriptionIdStr{SubscriptionIdStr: "subscription"},
DataGpbkv: []*telemetry.TelemetryField{
{
Fields: []*telemetry.TelemetryField{
{
Name: "keys",
Fields: []*telemetry.TelemetryField{
{
Name: "foo",
ValueByType: &telemetry.TelemetryField_StringValue{StringValue: "bar"},
},
},
},
{
Name: "content",
Fields: []*telemetry.TelemetryField{
{
Name: "list",
Fields: []*telemetry.TelemetryField{
{
Name: "name",
ValueByType: &telemetry.TelemetryField_StringValue{StringValue: "entry1"},
},
{
Name: "test",
ValueByType: &telemetry.TelemetryField_StringValue{StringValue: "foo"},
},
},
},
{
Name: "list",
Fields: []*telemetry.TelemetryField{
{
Name: "name",
ValueByType: &telemetry.TelemetryField_StringValue{StringValue: "entry2"},
},
{
Name: "test",
ValueByType: &telemetry.TelemetryField_StringValue{StringValue: "bar"},
},
},
},
},
},
},
},
},
}
data, _ := proto.Marshal(telemetry)
c.handleTelemetry(data)
assert.Empty(t, acc.Errors)
tags1 := map[string]string{"path": "type:model/extra", "foo": "bar", "source": "hostname", "subscription": "subscription", "list/name": "entry1"}
fields1 := map[string]interface{}{"list/test": "foo"}
tags2 := map[string]string{"path": "type:model/extra", "foo": "bar", "source": "hostname", "subscription": "subscription", "list/name": "entry2"}
fields2 := map[string]interface{}{"list/test": "bar"}
acc.AssertContainsTaggedFields(t, "extra", fields1, tags1)
acc.AssertContainsTaggedFields(t, "extra", fields2, tags2)
}
func TestHandleNXAPI(t *testing.T) {
c := &CiscoTelemetryMDT{Transport: "dummy", Aliases: map[string]string{"nxapi": "show nxapi"}}
acc := &testutil.Accumulator{}
c.Start(acc)
telemetry := &telemetry.Telemetry{
MsgTimestamp: 1543236572000,
EncodingPath: "show nxapi",
NodeId: &telemetry.Telemetry_NodeIdStr{NodeIdStr: "hostname"},
Subscription: &telemetry.Telemetry_SubscriptionIdStr{SubscriptionIdStr: "subscription"},
DataGpbkv: []*telemetry.TelemetryField{
{
Fields: []*telemetry.TelemetryField{
{
Name: "keys",
Fields: []*telemetry.TelemetryField{
{
Name: "foo",
ValueByType: &telemetry.TelemetryField_StringValue{StringValue: "bar"},
},
},
},
{
Name: "content",
Fields: []*telemetry.TelemetryField{
{
Fields: []*telemetry.TelemetryField{
{
Name: "TABLE_nxapi",
Fields: []*telemetry.TelemetryField{
{
Fields: []*telemetry.TelemetryField{
{
Name: "ROW_nxapi",
Fields: []*telemetry.TelemetryField{
{
Fields: []*telemetry.TelemetryField{
{
Name: "index",
ValueByType: &telemetry.TelemetryField_StringValue{StringValue: "i1"},
},
{
Name: "value",
ValueByType: &telemetry.TelemetryField_StringValue{StringValue: "foo"},
},
},
},
{
Fields: []*telemetry.TelemetryField{
{
Name: "index",
ValueByType: &telemetry.TelemetryField_StringValue{StringValue: "i2"},
},
{
Name: "value",
ValueByType: &telemetry.TelemetryField_StringValue{StringValue: "bar"},
},
},
},
},
},
},
},
},
},
},
},
},
},
},
},
},
}
data, _ := proto.Marshal(telemetry)
c.handleTelemetry(data)
assert.Empty(t, acc.Errors)
tags1 := map[string]string{"path": "show nxapi", "foo": "bar", "TABLE_nxapi": "i1", "source": "hostname", "subscription": "subscription"}
fields1 := map[string]interface{}{"value": "foo"}
tags2 := map[string]string{"path": "show nxapi", "foo": "bar", "TABLE_nxapi": "i2", "source": "hostname", "subscription": "subscription"}
fields2 := map[string]interface{}{"value": "bar"}
acc.AssertContainsTaggedFields(t, "nxapi", fields1, tags1)
acc.AssertContainsTaggedFields(t, "nxapi", fields2, tags2)
}
func TestHandleNXDME(t *testing.T) {
c := &CiscoTelemetryMDT{Transport: "dummy", Aliases: map[string]string{"dme": "sys/dme"}}
acc := &testutil.Accumulator{}
c.Start(acc)
telemetry := &telemetry.Telemetry{
MsgTimestamp: 1543236572000,
EncodingPath: "sys/dme",
NodeId: &telemetry.Telemetry_NodeIdStr{NodeIdStr: "hostname"},
Subscription: &telemetry.Telemetry_SubscriptionIdStr{SubscriptionIdStr: "subscription"},
DataGpbkv: []*telemetry.TelemetryField{
{
Fields: []*telemetry.TelemetryField{
{
Name: "keys",
Fields: []*telemetry.TelemetryField{
{
Name: "foo",
ValueByType: &telemetry.TelemetryField_StringValue{StringValue: "bar"},
},
},
},
{
Name: "content",
Fields: []*telemetry.TelemetryField{
{
Fields: []*telemetry.TelemetryField{
{
Name: "fooEntity",
Fields: []*telemetry.TelemetryField{
{
Fields: []*telemetry.TelemetryField{
{
Name: "attributes",
Fields: []*telemetry.TelemetryField{
{
Fields: []*telemetry.TelemetryField{
{
Name: "rn",
ValueByType: &telemetry.TelemetryField_StringValue{StringValue: "some-rn"},
},
{
Name: "value",
ValueByType: &telemetry.TelemetryField_StringValue{StringValue: "foo"},
},
},
},
},
},
},
},
},
},
},
},
},
},
},
},
},
}
data, _ := proto.Marshal(telemetry)
c.handleTelemetry(data)
assert.Empty(t, acc.Errors)
tags1 := map[string]string{"path": "sys/dme", "foo": "bar", "fooEntity": "some-rn", "source": "hostname", "subscription": "subscription"}
fields1 := map[string]interface{}{"value": "foo"}
acc.AssertContainsTaggedFields(t, "dme", fields1, tags1)
}
func TestTCPDialoutOverflow(t *testing.T) {
c := &CiscoTelemetryMDT{Transport: "tcp", ServiceAddress: "127.0.0.1:57000"}
acc := &testutil.Accumulator{}