/
ecs.go
176 lines (146 loc) · 4.35 KB
/
ecs.go
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package ecs
import (
"context"
"errors"
"fmt"
"regexp"
"time"
ecsTypes "github.com/mackerelio/mackerel-container-agent/internal/amazon-ecs-agent/agent/handlers/v2"
"github.com/mackerelio/golib/logging"
"github.com/mackerelio/mackerel-container-agent/metric"
"github.com/mackerelio/mackerel-container-agent/metric/hostinfo"
"github.com/mackerelio/mackerel-container-agent/platform"
"github.com/mackerelio/mackerel-container-agent/platform/ecs/taskmetadata"
"github.com/mackerelio/mackerel-container-agent/spec"
)
const (
executionEnvFargate = "AWS_ECS_FARGATE"
executionEnvEC2 = "AWS_ECS_EC2"
// ExecutionEnvECSExternal : (experimental) It is a definition that is handled internally, not an environment variable.
ExecutionEnvECSExternal = "ECS_EXTERNAL"
)
var (
logger = logging.GetLogger("ecs")
taskMetadataWaitForReadyInterval = 3 * time.Second
)
// TaskMetadataEndpointClient interface gets task metadata and task stats
type TaskMetadataEndpointClient interface {
TaskMetadataGetter
TaskStatsGetter
}
type networkMode string
const (
bridgeNetworkMode networkMode = "bridge"
hostNetworkMode networkMode = "host"
awsvpcNetworkMode networkMode = "awsvpc"
)
type ecsPlatform struct {
client TaskMetadataEndpointClient
provider provider
networkMode networkMode
}
// NewECSPlatform creates a new Platform
func NewECSPlatform(ctx context.Context, metadataURI string, executionEnv string, ignoreContainer *regexp.Regexp) (platform.Platform, error) {
c, err := taskmetadata.NewClient(metadataURI, ignoreContainer)
if err != nil {
return nil, err
}
p, err := resolveProvider(executionEnv)
if err != nil {
return nil, err
}
meta, err := getTaskMetadata(ctx, c, taskMetadataWaitForReadyInterval)
if err != nil {
return nil, err
}
nm, err := detectNetworkMode(meta)
if err != nil {
return nil, err
}
return &ecsPlatform{
client: c,
provider: p,
networkMode: nm,
}, nil
}
// GetMetricGenerators gets metric generators
func (p *ecsPlatform) GetMetricGenerators() []metric.Generator {
g := []metric.Generator{
newMetricGenerator(p.client, hostinfo.NewGenerator()),
}
if p.networkMode != bridgeNetworkMode {
g = append(g, metric.NewInterfaceGenerator())
}
return g
}
// GetSpecGenerators gets spec generator
func (p *ecsPlatform) GetSpecGenerators() []spec.Generator {
return []spec.Generator{
newSpecGenerator(p.client, p.provider),
&spec.CPUGenerator{},
}
}
// GetCustomIdentifier gets custom identifier
func (p *ecsPlatform) GetCustomIdentifier(context.Context) (string, error) {
return "", nil
}
// StatusRunning reports p status is running
func (p *ecsPlatform) StatusRunning(ctx context.Context) bool {
meta, err := p.client.GetTaskMetadata(ctx)
if err != nil {
logger.Warningf("failed to get metadata: %s", err)
return false
}
return isRunning(meta.KnownStatus)
}
func isRunning(status string) bool {
return status == "RUNNING"
}
func resolveProvider(executionEnv string) (provider, error) {
switch executionEnv {
case executionEnvFargate:
return fargateProvider, nil
case executionEnvEC2:
return ecsProvider, nil
case ExecutionEnvECSExternal:
return ecsAnywhereProvider, nil
default:
return provider("UNKNOWN"), fmt.Errorf("unknown execution env: %q", executionEnv)
}
}
func detectNetworkMode(meta *ecsTypes.TaskResponse) (networkMode, error) {
if len(meta.Containers) == 0 {
return "", errors.New("there are no containers")
}
if len(meta.Containers[0].Networks) == 0 {
return "", errors.New("there are no networks")
}
nm := meta.Containers[0].Networks[0].NetworkMode
switch nm {
case "default", "bridge":
return bridgeNetworkMode, nil
case "host":
return hostNetworkMode, nil
case "awsvpc":
return awsvpcNetworkMode, nil
default:
return "", fmt.Errorf("unsupported NetworkMode: %v", nm)
}
}
func getTaskMetadata(ctx context.Context, client TaskMetadataGetter, interval time.Duration) (*ecsTypes.TaskResponse, error) {
// GetTaskMetadata will return an error until all containers associated with the task have been created.
// To avoid exiting with this error, retry until GetTaskMetadata succeeds.
for {
meta, err := client.GetTaskMetadata(ctx)
if err == nil {
return meta, nil
}
logger.Infof("wait for the task API to be ready: %q", err)
select {
case <-time.After(interval):
continue
case <-ctx.Done():
return nil, ctx.Err()
}
}
}