Chore: Use interfaces where possible (#26392)

Signed-off-by: Arve Knudsen <arve.knudsen@gmail.com>

pkg/components/imguploader/s3uploader.go

@@ -7,6 +7,7 @@ import (
 	"time"
 
 	"github.com/aws/aws-sdk-go/aws"
+	"github.com/aws/aws-sdk-go/aws/client"
 	"github.com/aws/aws-sdk-go/aws/credentials"
 	"github.com/aws/aws-sdk-go/aws/credentials/ec2rolecreds"
 	"github.com/aws/aws-sdk-go/aws/credentials/endpointcreds"
@@ -99,7 +100,7 @@ func (u *S3Uploader) Upload(ctx context.Context, imageDiskPath string) (string,
 	return result.Location, nil
 }
 
-func webIdentityProvider(sess *session.Session) credentials.Provider {
+func webIdentityProvider(sess client.ConfigProvider) credentials.Provider {
 	svc := sts.New(sess)
 
 	roleARN := os.Getenv("AWS_ROLE_ARN")
@@ -128,6 +129,6 @@ func ecsCredProvider(sess *session.Session, uri string) credentials.Provider {
 		func(p *endpointcreds.Provider) { p.ExpiryWindow = 5 * time.Minute })
 }
 
-func ec2RoleProvider(sess *session.Session) credentials.Provider {
+func ec2RoleProvider(sess client.ConfigProvider) credentials.Provider {
 	return &ec2rolecreds.EC2RoleProvider{Client: ec2metadata.New(sess), ExpiryWindow: 5 * time.Minute}
 }

pkg/infra/metrics/graphitebridge/graphite.go

@@ -295,7 +295,7 @@ func writeMetric(buf *bufio.Writer, m model.Metric, mf *dto.MetricFamily) error
 	return addExtensionConventionForRollups(buf, mf, m)
 }
 
-func addExtensionConventionForRollups(buf *bufio.Writer, mf *dto.MetricFamily, m model.Metric) error {
+func addExtensionConventionForRollups(buf io.Writer, mf *dto.MetricFamily, m model.Metric) error {
 	// Adding `.count` `.sum` suffix makes it possible to configure
 	// different rollup strategies based on metric type
 

pkg/services/alerting/alerting_usage.go

@@ -3,7 +3,6 @@ package alerting
 import (
 	"encoding/json"
 
-	"github.com/grafana/grafana/pkg/components/simplejson"
 	"github.com/grafana/grafana/pkg/models"
 )
 
@@ -75,7 +74,7 @@ func (ae *AlertEngine) mapRulesToUsageStats(rules []*models.Alert) (DatasourceAl
 	return result, nil
 }
 
-func (ae *AlertEngine) parseAlertRuleModel(settings *simplejson.Json) ([]int64, error) {
+func (ae *AlertEngine) parseAlertRuleModel(settings json.Marshaler) ([]int64, error) {
 	datasourceIDs := []int64{}
 	model := alertJSONModel{}
 
@@ -85,7 +84,7 @@ func (ae *AlertEngine) parseAlertRuleModel(settings *simplejson.Json) ([]int64,
 
 	bytes, err := settings.MarshalJSON()
 	if err != nil {
-		return datasourceIDs, err
+		return nil, err
 	}
 
 	err = json.Unmarshal(bytes, &model)

pkg/services/alerting/alerting_usage_test.go

@@ -1,6 +1,7 @@
 package alerting
 
 import (
+	"encoding/json"
 	"io/ioutil"
 	"testing"
 
@@ -95,8 +96,7 @@ func TestParsingAlertRuleSettings(t *testing.T) {
 			shouldErr: require.NoError,
 		},
 		{
-			name:      "can parse blank content",
-			file:      "testdata/settings/invalid_format.json",
+			name:      "can handle nil content",
 			expected:  []int64{},
 			shouldErr: require.NoError,
 		},
@@ -108,12 +108,16 @@ func TestParsingAlertRuleSettings(t *testing.T) {
 
 	for _, tc := range tcs {
 		t.Run(tc.name, func(t *testing.T) {
-			content, err := ioutil.ReadFile(tc.file)
-			require.NoError(t, err, "expected to be able to read file")
+			var settings json.Marshaler
+			if tc.file != "" {
+				content, err := ioutil.ReadFile(tc.file)
+				require.NoError(t, err, "expected to be able to read file")
 
-			j, _ := simplejson.NewJson(content)
+				settings, err = simplejson.NewJson(content)
+				require.NoError(t, err)
+			}
 
-			result, err := ae.parseAlertRuleModel(j)
+			result, err := ae.parseAlertRuleModel(settings)
 
 			tc.shouldErr(t, err)
 			diff := cmp.Diff(tc.expected, result)

pkg/services/alerting/extractor.go

@@ -1,6 +1,7 @@
 package alerting
 
 import (
+	"encoding/json"
 	"errors"
 	"fmt"
 	"time"
@@ -64,7 +65,7 @@ func findPanelQueryByRefID(panel *simplejson.Json, refID string) *simplejson.Jso
 	return nil
 }
 
-func copyJSON(in *simplejson.Json) (*simplejson.Json, error) {
+func copyJSON(in json.Marshaler) (*simplejson.Json, error) {
 	rawJSON, err := in.MarshalJSON()
 	if err != nil {
 		return nil, err

pkg/tsdb/cloudwatch/cloudwatch.go

@@ -12,6 +12,7 @@ import (
 	"github.com/aws/aws-sdk-go/aws/request"
 	"github.com/aws/aws-sdk-go/service/cloudwatch"
 	"github.com/aws/aws-sdk-go/service/cloudwatchlogs"
+	"github.com/aws/aws-sdk-go/service/cloudwatchlogs/cloudwatchlogsiface"
 	"github.com/aws/aws-sdk-go/service/ec2/ec2iface"
 	"github.com/aws/aws-sdk-go/service/resourcegroupstaggingapi/resourcegroupstaggingapiiface"
 	"github.com/grafana/grafana/pkg/components/simplejson"
@@ -115,7 +116,8 @@ func (e *cloudWatchExecutor) getCWLogsClient(region string) (*cloudwatchlogs.Clo
 	return newLogsClient, nil
 }
 
-func (e *cloudWatchExecutor) alertQuery(ctx context.Context, logsClient *cloudwatchlogs.CloudWatchLogs, queryContext *tsdb.TsdbQuery) (*cloudwatchlogs.GetQueryResultsOutput, error) {
+func (e *cloudWatchExecutor) alertQuery(ctx context.Context, logsClient cloudwatchlogsiface.CloudWatchLogsAPI,
+	queryContext *tsdb.TsdbQuery) (*cloudwatchlogs.GetQueryResultsOutput, error) {
 	const maxAttempts = 8
 	const pollPeriod = 1000 * time.Millisecond
 

pkg/tsdb/cloudwatch/credentials.go

@@ -142,7 +142,7 @@ func getCredentials(dsInfo *datasourceInfo) (*credentials.Credentials, error) {
 	return creds, nil
 }
 
-func webIdentityProvider(sess *session.Session) credentials.Provider {
+func webIdentityProvider(sess client.ConfigProvider) credentials.Provider {
 	svc := newSTSService(sess)
 
 	roleARN := os.Getenv("AWS_ROLE_ARN")
@@ -171,7 +171,7 @@ func ecsCredProvider(sess *session.Session, uri string) credentials.Provider {
 		func(p *endpointcreds.Provider) { p.ExpiryWindow = 5 * time.Minute })
 }
 
-func ec2RoleProvider(sess *session.Session) credentials.Provider {
+func ec2RoleProvider(sess client.ConfigProvider) credentials.Provider {
 	return &ec2rolecreds.EC2RoleProvider{Client: newEC2Metadata(sess), ExpiryWindow: 5 * time.Minute}
 }
 

scripts/go/configs/.golangci.toml

@@ -26,7 +26,6 @@ enable = [
   "gosimple",
   "govet",
   "ineffassign",
-  # "interfacer",
   "misspell",
   "nakedret",
   "rowserrcheck",