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fluentd.go
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fluentd.go
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// Copyright 2017 Istio 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.
//go:generate $GOPATH/src/istio.io/istio/bin/mixer_codegen.sh -f mixer/adapter/fluentd/config/config.proto
// Package fluentd adapter for Mixer. Conforms to interfaces in
// mixer/pkg/adapter. Accepts logentries and forwards to a listening
// fluentd daemon
package fluentd
import (
"context"
"net"
"strconv"
"time"
"github.com/fluent/fluent-logger-golang/fluent"
descriptor "istio.io/api/policy/v1beta1"
"istio.io/istio/mixer/adapter/fluentd/config"
"istio.io/istio/mixer/pkg/adapter"
"istio.io/istio/mixer/template/logentry"
)
var (
defaultAddress = "localhost:24224"
)
type (
builder struct {
adpCfg *config.Params
types map[string]*logentry.Type
}
handler struct {
logger fluentdLogger
types map[string]*logentry.Type
env adapter.Env
}
)
type fluentdLogger interface {
Close() error
PostWithTime(string, time.Time, interface{}) error
}
// ensure types implement the requisite interfaces
var _ logentry.HandlerBuilder = &builder{}
var _ logentry.Handler = &handler{}
///////////////// Configuration-time Methods ///////////////
// adapter.HandlerBuilder#Build
func (b *builder) Build(ctx context.Context, env adapter.Env) (adapter.Handler, error) {
h, pStr, err := net.SplitHostPort(b.adpCfg.Address)
if err != nil {
return nil, err
}
p, err := strconv.Atoi(pStr)
if err != nil {
return nil, err
}
han := &handler{
types: b.types,
env: env,
}
han.logger, err = fluent.New(fluent.Config{FluentPort: p, FluentHost: h})
if err != nil {
return nil, err
}
return han, nil
}
func (b *builder) injectBuild(ctx context.Context, env adapter.Env, l fluentdLogger) (adapter.Handler, error) {
han := &handler{
logger: l,
types: b.types,
env: env,
}
return han, nil
}
// adapter.HandlerBuilder#SetAdapterConfig
func (b *builder) SetAdapterConfig(cfg adapter.Config) {
b.adpCfg = cfg.(*config.Params)
}
// adapter.HandlerBuilder#Validate
func (b *builder) Validate() (ce *adapter.ConfigErrors) {
if b.adpCfg.Address == "" {
ce = ce.Appendf("address", "Address is empty")
}
if _, _, err := net.SplitHostPort(b.adpCfg.Address); err != nil {
ce = ce.Appendf("address", "Address is malformed: %v", err)
}
return
}
// logentry.HandlerBuilder#SetLogEntryTypes
func (b *builder) SetLogEntryTypes(types map[string]*logentry.Type) {
b.types = types
}
////////////////// Request-time Methods //////////////////////////
// logentry.Handler#HandleLogEntry
func (h *handler) HandleLogEntry(ctx context.Context, insts []*logentry.Instance) error {
for _, i := range insts {
h.env.Logger().Debugf("Got a new log for fluentd, name %v", i.Name)
// Durations are not supported by msgp
for k, v := range i.Variables {
if h.types[i.Name].Variables[k] == descriptor.DURATION {
d := v.(time.Duration)
i.Variables[k] = d.String()
}
}
i.Variables["severity"] = i.Severity
tag, ok := i.Variables["tag"]
if !ok {
tag = i.Name
} else {
i.Variables["name"] = i.Name
delete(i.Variables, "tag")
}
if err := h.logger.PostWithTime(tag.(string), i.Timestamp, i.Variables); err != nil {
return err
}
}
return nil
}
// adapter.Handler#Close
func (h *handler) Close() error {
return h.logger.Close()
}
////////////////// Bootstrap //////////////////////////
// GetInfo returns the adapter.Info specific to this adapter.
func GetInfo() adapter.Info {
return adapter.Info{
Name: "fluentd",
Description: "Sends logentrys to a fluentd instance",
SupportedTemplates: []string{
logentry.TemplateName,
},
NewBuilder: func() adapter.HandlerBuilder { return &builder{} },
DefaultConfig: &config.Params{
Address: defaultAddress,
},
}
}