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get ecs metadata
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| package main | |
| import ( | |
| "context" | |
| "encoding/json" | |
| "fmt" | |
| "io/ioutil" | |
| "log" | |
| "net/http" | |
| "net/url" | |
| "os" | |
| ) | |
| const ( | |
| ecsMetadataUriEnvV4 = "ECS_CONTAINER_METADATA_URI_V4" | |
| ) | |
| type Client struct { | |
| HTTPClient *http.Client | |
| endpoint string | |
| } | |
| type TaskMetadata struct { | |
| Cluster string `json:"Cluster"` | |
| TaskARN string `json:"TaskARN"` | |
| Family string `json:"Family"` | |
| Revision string `json:"Revision"` | |
| DesiredStatus string `json:"DesiredStatus"` | |
| KnownStatus string `json:"KnownStatus"` | |
| AvailabilityZone string `json:"AvailabilityZone"` | |
| LaunchType string `json:"LaunchType"` | |
| Containers []struct { | |
| DockerID string `json:"DockerId"` | |
| Name string `json:"Name"` | |
| DockerName string `json:"DockerName"` | |
| Image string `json:"Image"` | |
| ImageID string `json:"ImageID"` | |
| Labels map[string]string `json:"Labels"` | |
| DesiredStatus string `json:"DesiredStatus"` | |
| KnownStatus string `json:"KnownStatus"` | |
| Type string `json:"Type"` | |
| ContainerARN string `json:"ContainerARN"` | |
| } `json:"Containers"` | |
| } | |
| type StatsMetadata struct { | |
| CPUStats struct { | |
| CPUUsage struct { | |
| TotalUsage int `json:"total_usage"` | |
| PerCPUUsage []int `json:"percpu_usage"` | |
| UsageInKernelmode int `json:"usage_in_kernelmode"` | |
| UsageInUsermode int `json:"usage_in_usermode"` | |
| } `json:"cpu_usage"` | |
| SystemCPUUsage int `json:"system_cpu_usage"` | |
| OnlineCPUs int `json:"online_cpus"` | |
| ThrottlingData struct { | |
| Periods int `json:"periods"` | |
| ThrottledPeriods int `json:"throttled_periods"` | |
| ThrottledTime int `json:"throttled_time"` | |
| } `json:"throttling_data"` | |
| } `json:"cpu_stats"` | |
| PreCPUStats struct { | |
| CPUUsage struct { | |
| TotalUsage int `json:"total_usage"` | |
| PerCPUUsage []int `json:"percpu_usage"` | |
| UsageInKernelmode int `json:"usage_in_kernelmode"` | |
| UsageInUsermode int `json:"usage_in_usermode"` | |
| } `json:"cpu_usage"` | |
| SystemCPUUsage int `json:"system_cpu_usage"` | |
| OnlineCPUs int `json:"online_cpus"` | |
| ThrottlingData struct { | |
| Periods int `json:"periods"` | |
| ThrottledPeriods int `json:"throttled_periods"` | |
| ThrottledTime int `json:"throttled_time"` | |
| } `json:"throttling_data"` | |
| } `json:"precpu_stats"` | |
| } | |
| // NewClient retrurns a new ECS client and endpoint | |
| func NewClient(endpoint string) *Client { | |
| return &Client{ | |
| HTTPClient: &http.Client{}, | |
| endpoint: endpoint, | |
| } | |
| } | |
| // NewClientToMetadataEndpoint returns a new ECS client and endpoint | |
| func NewClientToMetadataEndpoint() (*Client, error) { | |
| const endpointURI = "ECS_CONTAINER_METADATA_URI_V4" | |
| endpoint := os.Getenv(endpointURI) | |
| if endpoint == "" { | |
| return nil, fmt.Errorf("environment variable %s not set", endpointURI) | |
| } | |
| _, err := url.Parse(endpoint) | |
| if err != nil { | |
| return nil, fmt.Errorf("invalid endpoint: %s", err) | |
| } | |
| return NewClient(endpoint), nil | |
| } | |
| func (c *Client) request(ctx context.Context, uri string, out interface{}) error { | |
| req, err := http.NewRequest("GET", uri, nil) | |
| if err != nil { | |
| return err | |
| } | |
| req = req.WithContext(ctx) | |
| resp, err := c.HTTPClient.Do(req) | |
| if err != nil { | |
| return err | |
| } | |
| defer resp.Body.Close() | |
| body, err := ioutil.ReadAll(resp.Body) | |
| if err != nil { | |
| return err | |
| } | |
| return json.Unmarshal(body, out) | |
| } | |
| func (c *Client) RetriveTaskMetadata(ctx context.Context) (TaskMetadata, error) { | |
| var output TaskMetadata | |
| err := c.request(ctx, c.endpoint+"/task", &output) | |
| return output, err | |
| } | |
| func (c *Client) RetriveStatsMetadata(ctx context.Context) (map[string]StatsMetadata, error) { | |
| output := make(map[string]StatsMetadata) | |
| err := c.request(ctx, c.endpoint+"/task/stats", &output) | |
| return output, err | |
| } | |
| func main() { | |
| ctx := context.Background() | |
| client, err := NewClientToMetadataEndpoint() | |
| if err != nil { | |
| log.Printf("error creating client: %s", err) | |
| } | |
| taskMetadata, err := client.RetriveTaskMetadata(ctx) | |
| if err != nil { | |
| log.Printf("error retrieving task metadata: %s", err) | |
| } | |
| statsMetadata, err := client.RetriveStatsMetadata(ctx) | |
| if err != nil { | |
| log.Printf("error retrieving task stats metadata: %s", err) | |
| } | |
| for _, container := range taskMetadata.Containers { | |
| s := statsMetadata[container.DockerID] | |
| if &s == nil { | |
| log.Printf("Could not find stats for container %s", container.DockerID) | |
| continue | |
| } | |
| log.Printf("Total CPU Usage: %d", s.CPUStats.CPUUsage.TotalUsage) | |
| log.Printf("CPU Usage: %f", (float64(s.CPUStats.CPUUsage.TotalUsage)-float64(s.PreCPUStats.CPUUsage.TotalUsage))/ | |
| (float64(s.CPUStats.SystemCPUUsage)-float64(s.PreCPUStats.SystemCPUUsage))* | |
| float64(s.CPUStats.OnlineCPUs)*100) | |
| } | |
| } |
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