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httptrace.go
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httptrace.go
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// Copyright 2023 The Kelemetry Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package httptrace
import (
"bytes"
"context"
"encoding/json"
"fmt"
"io"
"net/http"
"net/url"
"text/template"
"time"
"github.com/jaegertracing/jaeger/model"
"github.com/sirupsen/logrus"
"github.com/kubewharf/kelemetry/pkg/frontend/extension"
"github.com/kubewharf/kelemetry/pkg/manager"
filterutil "github.com/kubewharf/kelemetry/pkg/util/filter"
utilobject "github.com/kubewharf/kelemetry/pkg/util/object"
)
func init() {
manager.Global.ProvideListImpl("frontend-extension/http-trace",
manager.Ptr(&NodeTraceFactory{}), &manager.List[extension.ProviderFactory]{})
}
const extensionKind = "HTTPTrace"
type NodeTraceFactory struct {
manager.BaseComponent
Logger logrus.FieldLogger
}
func (*NodeTraceFactory) ListIndex() string { return extensionKind }
func (s *NodeTraceFactory) Configure(jsonBuf []byte) (extension.Provider, error) {
providerArgs := &ProviderArgs{}
if err := json.Unmarshal(jsonBuf, providerArgs); err != nil {
return nil, fmt.Errorf("cannot parse httptrace config: %w", err)
}
for i, traceArg := range providerArgs.TraceBackends {
argsTemplates := map[string]*template.Template{}
for tagKey, templateString := range traceArg.ArgsTemplates {
t, err := template.New(tagKey).Funcs(templateFuncs()).Parse(templateString)
if err != nil {
return nil, fmt.Errorf("invalid tag template %q: %w", tagKey, err)
}
argsTemplates[tagKey] = t
}
urlTemplate, err := template.New("url").Funcs(templateFuncs()).Parse(traceArg.URLTemplate)
if err != nil {
return nil, fmt.Errorf("invalid url template %q: %w", traceArg.URLTemplate, err)
}
providerArgs.TraceBackends[i].urlTemplate = urlTemplate
providerArgs.TraceBackends[i].argsTemplates = argsTemplates
}
totalTimeout, err := time.ParseDuration(providerArgs.TotalTimeout)
if err != nil {
return nil, fmt.Errorf("parse totalTimeout error: %w", err)
}
return &Provider{
logger: s.Logger,
service: providerArgs.Service,
operation: providerArgs.Operation,
traceBackends: providerArgs.TraceBackends,
totalTimeout: totalTimeout,
maxConcurrency: providerArgs.MaxConcurrency,
rawConfig: jsonBuf,
}, nil
}
type ProviderArgs struct {
Service string `json:"service"`
Operation string `json:"operation"`
TraceBackends []TraceBackend `json:"traceBackends"`
TotalTimeout string `json:"totalTimeout"`
MaxConcurrency int `json:"maxConcurrency"`
}
type TraceBackend struct {
TagFilters filterutil.TagFilters `json:"tagFilters"`
ArgsTemplates map[string]string `json:"argsTemplates"`
URLTemplate string `json:"urlTemplate"`
ForObject bool `json:"forObject"`
ForAuditEvent bool `json:"forAuditEvent"`
urlTemplate *template.Template
argsTemplates map[string]*template.Template
}
type Provider struct {
logger logrus.FieldLogger
service string
operation string
traceBackends []TraceBackend
totalTimeout time.Duration
maxConcurrency int
rawConfig []byte
}
func (provider *Provider) Kind() string { return extensionKind }
func (provider *Provider) RawConfig() []byte { return provider.rawConfig }
func (provider *Provider) TotalTimeout() time.Duration { return provider.totalTimeout }
func (provider *Provider) MaxConcurrency() int { return provider.maxConcurrency }
func (provider *Provider) FetchForObject(
ctx context.Context,
object utilobject.VersionedKey,
mainTags model.KeyValues,
start, end time.Time,
) (*extension.FetchResult, error) {
var backends []TraceBackend
for _, b := range provider.traceBackends {
if b.ForObject {
backends = append(backends, b)
}
}
if len(backends) == 0 {
return nil, nil
}
return provider.fetch(
ctx, object, mainTags, start, end,
objectTemplateArgs(object),
backends,
)
}
func (provider *Provider) FetchForVersion(
ctx context.Context,
object utilobject.VersionedKey,
resourceVersion string,
mainTags model.KeyValues,
start, end time.Time,
) (*extension.FetchResult, error) {
var backends []TraceBackend
for _, b := range provider.traceBackends {
if b.ForAuditEvent {
backends = append(backends, b)
}
}
if len(backends) == 0 {
return nil, nil
}
templateArgs := objectTemplateArgs(object)
templateArgs["resourceVersion"] = resourceVersion
return provider.fetch(
ctx, object, mainTags, start, end,
templateArgs,
backends,
)
}
type identifier struct {
TraceIds []model.TraceID `json:"traceIds"`
Start time.Time `json:"start"`
End time.Time `json:"end"`
}
func (provider *Provider) LoadCache(ctx context.Context, jsonBuf []byte) ([]*model.Span, error) {
var ident identifier
if err := json.Unmarshal(jsonBuf, &ident); err != nil {
return nil, fmt.Errorf("cannot unmarshal cached identifier: %w", err)
}
var spans []*model.Span
for _, traceId := range ident.TraceIds {
trace, err := provider.getTrace(ctx, traceId)
if err != nil {
return nil, fmt.Errorf("cannot get trace from extension storage: %w", err)
}
spans = append(spans, trace.Spans...)
}
return spans, nil
}
func objectTemplateArgs(object utilobject.VersionedKey) map[string]any {
return map[string]any{
"cluster": object.Cluster,
"group": object.Group,
"version": object.Version,
"resource": object.Resource,
"groupVersion": object.GroupVersion().String(),
"groupResource": object.GroupResource().String(),
"namespace": object.Namespace,
"name": object.Name,
}
}
// fetch returns traces search from first successful traceBackend
func (provider *Provider) fetch(
ctx context.Context,
_ utilobject.VersionedKey,
mainTags model.KeyValues,
start, end time.Time,
templateArgs map[string]any,
traceBackends []TraceBackend,
) (*extension.FetchResult, error) {
for _, mainTag := range mainTags {
templateArgs[mainTag.Key] = mainTag.Value()
}
templateArgs["start"] = start
templateArgs["end"] = end
stringTags := map[string]string{}
for key, val := range templateArgs {
if strVal, ok := val.(string); ok {
stringTags[key] = strVal
}
}
for _, traceBackend := range traceBackends {
if !traceBackend.TagFilters.Check(stringTags) {
continue
}
queryArgs := map[string]string{}
for tagKey, tagTemplate := range traceBackend.argsTemplates {
buf := new(bytes.Buffer)
err := tagTemplate.Execute(buf, templateArgs)
if err != nil {
return nil, fmt.Errorf("cannot execute tag template: %w", err)
}
queryArgs[tagKey] = buf.String()
}
buf := new(bytes.Buffer)
err := traceBackend.urlTemplate.Execute(buf, templateArgs)
if err != nil {
return nil, fmt.Errorf("cannot execute tag template: %w", err)
}
traceUrl := buf.String()
traces, err := provider.findTraces(ctx, traceUrl, queryArgs)
provider.logger.
WithField("url", traceUrl).
WithField("args", queryArgs).
WithField("startTime", start).
WithField("endTime", end).
WithError(err).
Info("search node traces")
if err != nil {
continue
}
var traceIds []model.TraceID
var spans []*model.Span
for _, trace := range traces {
if len(trace.Spans) == 0 {
continue
}
traceIds = append(traceIds, trace.Spans[0].TraceID)
spans = append(spans, trace.Spans...)
}
return &extension.FetchResult{
Identifier: identifier{
TraceIds: traceIds,
Start: start,
End: end,
},
Spans: spans,
}, nil
}
return nil, nil
}
func (provider *Provider) findTraces(ctx context.Context, traceUrl string, queryArgs map[string]string) ([]*model.Trace, error) {
query := url.Values{}
for k, v := range queryArgs {
query.Add(k, v)
}
traceUrl = fmt.Sprintf("%s?%s", traceUrl, query.Encode())
req, err := http.NewRequestWithContext(ctx, http.MethodGet, traceUrl, nil)
if err != nil {
return nil, err
}
res, err := http.DefaultClient.Do(req)
if err != nil {
return nil, err
}
body, err := io.ReadAll(res.Body)
defer res.Body.Close()
if res.StatusCode > 299 {
return nil, fmt.Errorf("response failed with status code: %d and body: %s", res.StatusCode, string(body))
}
if err != nil {
return nil, fmt.Errorf("read response error: %w", err)
}
var traces TraceResponse
if err := json.Unmarshal(body, &traces); err != nil {
return nil, fmt.Errorf("cannot parse HTTP extension response: %w", err)
}
return traces.Data, nil
}
type TraceResponse struct {
Data []*model.Trace
}
// TODO
func (provider *Provider) getTrace(ctx context.Context, traceId model.TraceID) (*model.Trace, error) {
return nil, fmt.Errorf("trace cache for HTTP extension is unimplemented")
}
func templateFuncs() template.FuncMap {
return template.FuncMap{
"unixMicro": unixMicro,
}
}
func unixMicro(t interface{}) string {
if tt, ok := t.(time.Time); ok {
return fmt.Sprintf("%v", tt.UnixMicro())
}
return ""
}