cloudwatch: add support for defining AWS profile for CloudWatch datasource

Add support for defining AWS profile for CloudWatch datasource to support
pulling information from multiple different AWS accounts to single dashboard.

With this change, it is possible to define multiple AWS credentials in
~/.aws/credentials file and connect different data sources to different
AWS accounts.

pkg/api/cloudwatch/cloudwatch.go

@@ -7,6 +7,8 @@ import (
 	"time"
 
 	"github.com/aws/aws-sdk-go/aws"
+	"github.com/aws/aws-sdk-go/aws/credentials"
+	"github.com/aws/aws-sdk-go/aws/credentials/ec2rolecreds"
 	"github.com/aws/aws-sdk-go/service/cloudwatch"
 	"github.com/aws/aws-sdk-go/service/ec2"
 	"github.com/grafana/grafana/pkg/middleware"
@@ -18,6 +20,7 @@ var actionHandlers map[string]actionHandler
 
 type cwRequest struct {
 	Region  string `json:"region"`
+	Profile string `json:"profile"`
 	Action  string `json:"action"`
 	Body    []byte `json:"-"`
 }
@@ -35,7 +38,16 @@ func init() {
 }
 
 func handleGetMetricStatistics(req *cwRequest, c *middleware.Context) {
-	svc := cloudwatch.New(&aws.Config{Region: aws.String(req.Region)})
+	creds := credentials.NewChainCredentials(
+		[]credentials.Provider{
+			&credentials.EnvProvider{},
+			&credentials.SharedCredentialsProvider{Filename: "", Profile: req.Profile},
+			&ec2rolecreds.EC2RoleProvider{ExpiryWindow: 5 * time.Minute},
+		})
+	svc := cloudwatch.New(&aws.Config{
+		Region:      aws.String(req.Region),
+		Credentials: creds,
+	})
 
 	reqParam := &struct {
 		Parameters struct {
@@ -70,7 +82,17 @@ func handleGetMetricStatistics(req *cwRequest, c *middleware.Context) {
 }
 
 func handleListMetrics(req *cwRequest, c *middleware.Context) {
-	svc := cloudwatch.New(&aws.Config{Region: aws.String(req.Region)})
+	creds := credentials.NewChainCredentials(
+		[]credentials.Provider{
+			&credentials.EnvProvider{},
+			&credentials.SharedCredentialsProvider{Filename: "", Profile: req.Profile},
+			&ec2rolecreds.EC2RoleProvider{ExpiryWindow: 5 * time.Minute},
+		})
+	svc := cloudwatch.New(&aws.Config{
+		Region:      aws.String(req.Region),
+		Credentials: creds,
+	})
+
 	reqParam := &struct {
 		Parameters struct {
 			Namespace  string                        `json:"namespace"`
@@ -78,7 +100,6 @@ func handleListMetrics(req *cwRequest, c *middleware.Context) {
 			Dimensions []*cloudwatch.DimensionFilter `json:"dimensions"`
 		} `json:"parameters"`
 	}{}
-
 	json.Unmarshal(req.Body, reqParam)
 
 	params := &cloudwatch.ListMetricsInput{

public/app/plugins/datasource/cloudwatch/datasource.js

@@ -18,6 +18,7 @@ function (angular, _) {
       this.supportMetrics = true;
       this.proxyUrl = datasource.url;
       this.defaultRegion = datasource.jsonData.defaultRegion;
+      this.profile = datasource.jsonData.profile;
     }
 
     CloudWatchDatasource.prototype.query = function(options) {
@@ -73,6 +74,7 @@ function (angular, _) {
     CloudWatchDatasource.prototype.performTimeSeriesQuery = function(query, start, end) {
       return this.awsRequest({
         region: query.region,
+        profile: this.profile,
         action: 'GetMetricStatistics',
         parameters:  {
           namespace: query.namespace,
@@ -115,6 +117,7 @@ function (angular, _) {
     CloudWatchDatasource.prototype.getDimensionValues = function(region, namespace, metricName, dimensions) {
       var request = {
         region: templateSrv.replace(region),
+        profile: this.profile,
         action: 'ListMetrics',
         parameters: {
           namespace: templateSrv.replace(namespace),

public/app/plugins/datasource/cloudwatch/partials/config.html

@@ -12,6 +12,17 @@
   </ul>
   <div class="clearfix"></div>
 </div>
+<div class="tight-form last">
+  <ul class="tight-form-list">
+    <li class="tight-form-item" style="width: 160px">
+      AWS Profile
+    </li>
+    <li>
+      <input type="text" class="tight-form-input input-xlarge" ng-model='current.jsonData.profile' placeholder="default" required></input>
+    </li>
+  </ul>
+  <div class="clearfix"></div>
+</div>
 
 <!-- <div class="tight&#45;form" ng&#45;show="current.jsonData.access === 'direct'"> -->
 <!--   <ul class="tight&#45;form&#45;list"> -->