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cloudwatch.go
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cloudwatch.go
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package cloudwatch
import (
"encoding/json"
"errors"
"io/ioutil"
"time"
"github.com/aws/aws-sdk-go/aws"
"github.com/aws/aws-sdk-go/aws/awsutil"
"github.com/aws/aws-sdk-go/aws/credentials"
"github.com/aws/aws-sdk-go/aws/credentials/ec2rolecreds"
"github.com/aws/aws-sdk-go/aws/ec2metadata"
"github.com/aws/aws-sdk-go/aws/session"
"github.com/aws/aws-sdk-go/service/cloudwatch"
"github.com/aws/aws-sdk-go/service/ec2"
"github.com/grafana/grafana/pkg/middleware"
m "github.com/grafana/grafana/pkg/models"
)
type actionHandler func(*cwRequest, *middleware.Context)
var actionHandlers map[string]actionHandler
type cwRequest struct {
Region string `json:"region"`
Action string `json:"action"`
Body []byte `json:"-"`
DataSource *m.DataSource
}
func init() {
actionHandlers = map[string]actionHandler{
"GetMetricStatistics": handleGetMetricStatistics,
"ListMetrics": handleListMetrics,
"DescribeAlarms": handleDescribeAlarms,
"DescribeAlarmsForMetric": handleDescribeAlarmsForMetric,
"DescribeAlarmHistory": handleDescribeAlarmHistory,
"DescribeInstances": handleDescribeInstances,
"__GetRegions": handleGetRegions,
"__GetNamespaces": handleGetNamespaces,
"__GetMetrics": handleGetMetrics,
"__GetDimensions": handleGetDimensions,
}
}
var awsCredentials map[string]*credentials.Credentials = make(map[string]*credentials.Credentials)
func getCredentials(profile string) *credentials.Credentials {
if _, ok := awsCredentials[profile]; ok {
return awsCredentials[profile]
}
sess := session.New()
creds := credentials.NewChainCredentials(
[]credentials.Provider{
&credentials.EnvProvider{},
&credentials.SharedCredentialsProvider{Filename: "", Profile: profile},
&ec2rolecreds.EC2RoleProvider{Client: ec2metadata.New(sess), ExpiryWindow: 5 * time.Minute},
})
awsCredentials[profile] = creds
return creds
}
func handleGetMetricStatistics(req *cwRequest, c *middleware.Context) {
cfg := &aws.Config{
Region: aws.String(req.Region),
Credentials: getCredentials(req.DataSource.Database),
}
svc := cloudwatch.New(session.New(cfg), cfg)
reqParam := &struct {
Parameters struct {
Namespace string `json:"namespace"`
MetricName string `json:"metricName"`
Dimensions []*cloudwatch.Dimension `json:"dimensions"`
Statistics []*string `json:"statistics"`
StartTime int64 `json:"startTime"`
EndTime int64 `json:"endTime"`
Period int64 `json:"period"`
} `json:"parameters"`
}{}
json.Unmarshal(req.Body, reqParam)
params := &cloudwatch.GetMetricStatisticsInput{
Namespace: aws.String(reqParam.Parameters.Namespace),
MetricName: aws.String(reqParam.Parameters.MetricName),
Dimensions: reqParam.Parameters.Dimensions,
Statistics: reqParam.Parameters.Statistics,
StartTime: aws.Time(time.Unix(reqParam.Parameters.StartTime, 0)),
EndTime: aws.Time(time.Unix(reqParam.Parameters.EndTime, 0)),
Period: aws.Int64(reqParam.Parameters.Period),
}
resp, err := svc.GetMetricStatistics(params)
if err != nil {
c.JsonApiErr(500, "Unable to call AWS API", err)
return
}
c.JSON(200, resp)
}
func handleListMetrics(req *cwRequest, c *middleware.Context) {
cfg := &aws.Config{
Region: aws.String(req.Region),
Credentials: getCredentials(req.DataSource.Database),
}
svc := cloudwatch.New(session.New(cfg), cfg)
reqParam := &struct {
Parameters struct {
Namespace string `json:"namespace"`
MetricName string `json:"metricName"`
Dimensions []*cloudwatch.DimensionFilter `json:"dimensions"`
} `json:"parameters"`
}{}
json.Unmarshal(req.Body, reqParam)
params := &cloudwatch.ListMetricsInput{
Namespace: aws.String(reqParam.Parameters.Namespace),
MetricName: aws.String(reqParam.Parameters.MetricName),
Dimensions: reqParam.Parameters.Dimensions,
}
var resp cloudwatch.ListMetricsOutput
err := svc.ListMetricsPages(params,
func(page *cloudwatch.ListMetricsOutput, lastPage bool) bool {
metrics, _ := awsutil.ValuesAtPath(page, "Metrics")
for _, metric := range metrics {
resp.Metrics = append(resp.Metrics, metric.(*cloudwatch.Metric))
}
return !lastPage
})
if err != nil {
c.JsonApiErr(500, "Unable to call AWS API", err)
return
}
c.JSON(200, resp)
}
func handleDescribeAlarms(req *cwRequest, c *middleware.Context) {
cfg := &aws.Config{
Region: aws.String(req.Region),
Credentials: getCredentials(req.DataSource.Database),
}
svc := cloudwatch.New(session.New(cfg), cfg)
reqParam := &struct {
Parameters struct {
ActionPrefix string `json:"actionPrefix"`
AlarmNamePrefix string `json:"alarmNamePrefix"`
AlarmNames []*string `json:"alarmNames"`
StateValue string `json:"stateValue"`
} `json:"parameters"`
}{}
json.Unmarshal(req.Body, reqParam)
params := &cloudwatch.DescribeAlarmsInput{
MaxRecords: aws.Int64(100),
}
if reqParam.Parameters.ActionPrefix != "" {
params.ActionPrefix = aws.String(reqParam.Parameters.ActionPrefix)
}
if reqParam.Parameters.AlarmNamePrefix != "" {
params.AlarmNamePrefix = aws.String(reqParam.Parameters.AlarmNamePrefix)
}
if len(reqParam.Parameters.AlarmNames) != 0 {
params.AlarmNames = reqParam.Parameters.AlarmNames
}
if reqParam.Parameters.StateValue != "" {
params.StateValue = aws.String(reqParam.Parameters.StateValue)
}
resp, err := svc.DescribeAlarms(params)
if err != nil {
c.JsonApiErr(500, "Unable to call AWS API", err)
return
}
c.JSON(200, resp)
}
func handleDescribeAlarmsForMetric(req *cwRequest, c *middleware.Context) {
cfg := &aws.Config{
Region: aws.String(req.Region),
Credentials: getCredentials(req.DataSource.Database),
}
svc := cloudwatch.New(session.New(cfg), cfg)
reqParam := &struct {
Parameters struct {
Namespace string `json:"namespace"`
MetricName string `json:"metricName"`
Dimensions []*cloudwatch.Dimension `json:"dimensions"`
Statistic string `json:"statistic"`
Period int64 `json:"period"`
} `json:"parameters"`
}{}
json.Unmarshal(req.Body, reqParam)
params := &cloudwatch.DescribeAlarmsForMetricInput{
Namespace: aws.String(reqParam.Parameters.Namespace),
MetricName: aws.String(reqParam.Parameters.MetricName),
Period: aws.Int64(reqParam.Parameters.Period),
}
if len(reqParam.Parameters.Dimensions) != 0 {
params.Dimensions = reqParam.Parameters.Dimensions
}
if reqParam.Parameters.Statistic != "" {
params.Statistic = aws.String(reqParam.Parameters.Statistic)
}
resp, err := svc.DescribeAlarmsForMetric(params)
if err != nil {
c.JsonApiErr(500, "Unable to call AWS API", err)
return
}
c.JSON(200, resp)
}
func handleDescribeAlarmHistory(req *cwRequest, c *middleware.Context) {
cfg := &aws.Config{
Region: aws.String(req.Region),
Credentials: getCredentials(req.DataSource.Database),
}
svc := cloudwatch.New(session.New(cfg), cfg)
reqParam := &struct {
Parameters struct {
AlarmName string `json:"alarmName"`
HistoryItemType string `json:"historyItemType"`
StartDate int64 `json:"startDate"`
EndDate int64 `json:"endDate"`
} `json:"parameters"`
}{}
json.Unmarshal(req.Body, reqParam)
params := &cloudwatch.DescribeAlarmHistoryInput{
AlarmName: aws.String(reqParam.Parameters.AlarmName),
StartDate: aws.Time(time.Unix(reqParam.Parameters.StartDate, 0)),
EndDate: aws.Time(time.Unix(reqParam.Parameters.EndDate, 0)),
}
if reqParam.Parameters.HistoryItemType != "" {
params.HistoryItemType = aws.String(reqParam.Parameters.HistoryItemType)
}
resp, err := svc.DescribeAlarmHistory(params)
if err != nil {
c.JsonApiErr(500, "Unable to call AWS API", err)
return
}
c.JSON(200, resp)
}
func handleDescribeInstances(req *cwRequest, c *middleware.Context) {
cfg := &aws.Config{
Region: aws.String(req.Region),
Credentials: getCredentials(req.DataSource.Database),
}
svc := ec2.New(session.New(cfg), cfg)
reqParam := &struct {
Parameters struct {
Filters []*ec2.Filter `json:"filters"`
InstanceIds []*string `json:"instanceIds"`
} `json:"parameters"`
}{}
json.Unmarshal(req.Body, reqParam)
params := &ec2.DescribeInstancesInput{}
if len(reqParam.Parameters.Filters) > 0 {
params.Filters = reqParam.Parameters.Filters
}
if len(reqParam.Parameters.InstanceIds) > 0 {
params.InstanceIds = reqParam.Parameters.InstanceIds
}
var resp ec2.DescribeInstancesOutput
err := svc.DescribeInstancesPages(params,
func(page *ec2.DescribeInstancesOutput, lastPage bool) bool {
reservations, _ := awsutil.ValuesAtPath(page, "Reservations")
for _, reservation := range reservations {
resp.Reservations = append(resp.Reservations, reservation.(*ec2.Reservation))
}
return !lastPage
})
if err != nil {
c.JsonApiErr(500, "Unable to call AWS API", err)
return
}
c.JSON(200, resp)
}
func HandleRequest(c *middleware.Context, ds *m.DataSource) {
var req cwRequest
req.Body, _ = ioutil.ReadAll(c.Req.Request.Body)
req.DataSource = ds
json.Unmarshal(req.Body, &req)
if handler, found := actionHandlers[req.Action]; !found {
c.JsonApiErr(500, "Unexpected AWS Action", errors.New(req.Action))
return
} else {
handler(&req, c)
}
}