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fargate.go
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fargate.go
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/*
* Copyright 2019 New Relic Corporation. All rights reserved.
* SPDX-License-Identifier: Apache-2.0
*/
package discovery
import (
"encoding/json"
"fmt"
"io/ioutil"
"net/http"
"strings"
"sync"
"github.com/newrelic/nri-flex/internal/config"
"github.com/newrelic/nri-flex/internal/formatter"
"github.com/newrelic/nri-flex/internal/load"
"github.com/sirupsen/logrus"
yaml "gopkg.in/yaml.v2"
)
// runFargateDiscovery check aws metadata endpoint for containers
func runFargateDiscovery(configs *[]load.Config) {
load.Logrus.Debug("discovery: running fargate discovery")
client := &http.Client{}
resp, err := client.Get("http://169.254.170.2/v2/metadata")
if err != nil {
load.Logrus.WithFields(logrus.Fields{
"err": err,
}).Error("discovery: fargate aws v2 metadata fetch failed")
return
}
defer resp.Body.Close()
if resp.StatusCode == http.StatusOK {
load.IsFargate = true
bodyBytes, err := ioutil.ReadAll(resp.Body)
if err != nil {
load.Logrus.WithFields(logrus.Fields{
"err": err,
}).Error("discovery: fargate response body read fail")
} else {
TaskMetadata := load.TaskMetadata{}
err := json.Unmarshal(bodyBytes, &TaskMetadata)
if err != nil {
load.Logrus.WithFields(logrus.Fields{
"err": err,
}).Error("discovery: fargate responde body unmarshal fail")
} else {
determineDynamicFargateConfigs(configs, TaskMetadata)
}
}
}
}
// determineDynamicFargateConfigs
func determineDynamicFargateConfigs(configs *[]load.Config, TaskMetadata load.TaskMetadata) {
for _, currentConfig := range *configs {
if strings.HasPrefix(currentConfig.FileName, "cd-") {
if currentConfig.ContainerDiscovery.Mode == "" {
currentConfig.ContainerDiscovery.Mode = "contains"
}
if currentConfig.ContainerDiscovery.Type == "" {
currentConfig.ContainerDiscovery.Type = load.TypeContainer
}
if currentConfig.ContainerDiscovery.Target == "" {
target := strings.Replace(strings.TrimPrefix(currentConfig.FileName, "cd-"), ".yml", "", -1)
currentConfig.ContainerDiscovery.Target = strings.Replace(target, ".yaml", "", -1)
}
// check all containers async
var wg sync.WaitGroup
wg.Add(len(TaskMetadata.Containers))
for _, container := range TaskMetadata.Containers {
go func(container load.Container) {
defer wg.Done()
// do not target the flex container
if container.DockerID != load.ContainerID {
if checkContainerMatch(container, currentConfig.ContainerDiscovery) {
load.Logrus.Debug(fmt.Sprintf("discovery: fargate lookup matched %v - file %v", container.DockerID, currentConfig.FileName))
if len(container.Networks) > 0 {
if len(container.Networks[0].IPv4Addresses) > 0 {
addDynamicFargateConfig(configs, currentConfig, container)
} else {
load.Logrus.Debug(fmt.Sprintf("discovery: fargate container %v file %v - does not have any IPv4 Addresses configured", container.DockerID, currentConfig.FileName))
}
} else {
load.Logrus.Debug(fmt.Sprintf("discovery: fargate container %v file %v - does not have any networks configured", container.DockerID, currentConfig.FileName))
}
}
}
}(container)
}
wg.Wait()
}
}
}
func checkContainerMatch(container load.Container, containerDiscovery load.ContainerDiscovery) bool {
switch containerDiscovery.Type {
case "cname", load.TypeContainer:
if formatter.KvFinder(containerDiscovery.Mode, container.Name, containerDiscovery.Target) {
return true
}
case load.Img, load.Image:
if formatter.KvFinder(containerDiscovery.Mode, container.Image, containerDiscovery.Target) {
return true
}
default:
load.Logrus.Debug("discovery: fargate targetType not set id: " + container.DockerID)
}
return false
}
func addDynamicFargateConfig(configs *[]load.Config, currentConfig load.Config, container load.Container) {
tmpCfgBytes, err := yaml.Marshal(¤tConfig)
if err != nil {
load.Logrus.WithFields(logrus.Fields{
"err": err,
}).Error("discovery: fargate marshal config failed")
} else {
tmpCfgStr := string(tmpCfgBytes)
fargateIP := container.Networks[0].IPv4Addresses[0]
tmpCfgStr = strings.Replace(tmpCfgStr, "${auto:host}", fargateIP, -1)
tmpCfgStr = strings.Replace(tmpCfgStr, "${auto:ip}", fargateIP, -1)
newConfig, err := config.ReadYML(tmpCfgStr)
if err != nil {
load.Logrus.WithFields(logrus.Fields{
"name": newConfig.Name,
"err": err,
}).Error("discovery: fargate unmarshal config failed")
} else {
newConfig.ContainerDiscovery.ReplaceComplete = true
//add extra attributes
newConfig.CustomAttributes["containerId"] = container.DockerID
newConfig.CustomAttributes["containerName"] = container.Name
newConfig.CustomAttributes["image"] = container.Image
newConfig.CustomAttributes["imageId"] = container.ImageID
for key, val := range container.Labels {
newConfig.CustomAttributes[key] = val
}
*configs = append(*configs, newConfig)
}
}
}