Do not re-use connections

In order to avoid stale connections to Salesforce and files.com, do not
re-use those connections (the clients) and rather create new client
connections when needed.

Signed-off-by: Nicolas Bock <[email protected]>

cmd/monitor/main.go

@@ -40,22 +40,14 @@ func main() {
 		log.Debug(line)
 	}
 
-	filesClient, err := common.NewFilesComClient(cfg.FilesCom.Key, cfg.FilesCom.Endpoint)
-	if err != nil {
-		panic(err)
-	}
-
-	sfClient, err := common.NewSalesforceClient(cfg)
-	if err != nil {
-		panic(err)
-	}
-
 	natsClient, err := nats.NewNats("test-cluster", stan.NatsURL(*natsUrl))
 	if err != nil {
 		panic(err)
 	}
 
-	m, err := monitor.NewMonitor(filesClient, sfClient, natsClient, cfg, nil)
+	salesforceClientFactory := &common.BaseSalesforceClientFactory{}
+	filesComClientFactory := &common.BaseFilesComClientFactory{}
+	m, err := monitor.NewMonitor(natsClient, cfg, nil, salesforceClientFactory, filesComClientFactory)
 	if err != nil {
 		panic(err)
 	}

docker-compose.yml

@@ -19,7 +19,7 @@ services:
     container_name: athena-monitor
     image: ghcr.io/canonical/athena-core/athena-monitor:${BRANCH:-main}
     volumes:
-      - ./creds.yaml:/etc/athena/main.yaml
+      - ./creds-athena.yaml:/etc/athena/main.yaml
       - ./athena-monitor.yaml:/etc/athena/monitor.yaml
       - ./athena-monitor-directories.yaml:/etc/athena/monitor-directories.yaml
       - ./tmp:/tmp/athena
@@ -39,7 +39,7 @@ services:
     container_name: athena-processor
     image: ghcr.io/canonical/athena-core/athena-processor:${BRANCH:-main}
     volumes:
-      - ./creds.yaml:/etc/athena/main.yaml
+      - ./creds-athena.yaml:/etc/athena/main.yaml
       - ./athena-processor.yaml:/etc/athena/processor.yaml
       - ./athena-processor-upload.yaml:/etc/athena/processor-upload.yaml
       - ./tmp:/tmp/athena

pkg/common/files-com.go

@@ -22,11 +22,21 @@ type FilesComClient interface {
 	Upload(contents, destinationPath string) (*filessdk.File, error)
 }
 
+type FilesComClientFactory interface {
+	NewFilesComClient(apiKey, endpoint string) (FilesComClient, error)
+}
+
 type BaseFilesComClient struct {
 	FilesComClient
 	ApiClient file.Client
 }
 
+type BaseFilesComClientFactory struct{}
+
+func (client *BaseFilesComClientFactory) NewFilesComClient(apiKey, endpoint string) (FilesComClient, error) {
+	return NewFilesComClient(apiKey, endpoint)
+}
+
 func (client *BaseFilesComClient) Upload(contents, destinationPath string) (*filessdk.File, error) {
 	log.Infof("Uploading to '%s'", destinationPath)
 	tmpfile, err := os.CreateTemp("", "upload")

pkg/common/salesforce.go

@@ -30,10 +30,16 @@ type SalesforceClient interface {
 	SObject(objectName ...string) *simpleforce.SObject
 }
 
+type SalesforceClientFactory interface {
+	NewSalesforceClient(config *config.Config) (SalesforceClient, error)
+}
+
 type BaseSalesforceClient struct {
 	*simpleforce.Client
 }
 
+type BaseSalesforceClientFactory struct{}
+
 func NewSalesforceClient(config *config.Config) (SalesforceClient, error) {
 	log.Infof("Creating new Salesforce client")
 	client := simpleforce.NewClient(config.Salesforce.Endpoint, simpleforce.DefaultClientID, simpleforce.DefaultAPIVersion)
@@ -43,6 +49,10 @@ func NewSalesforceClient(config *config.Config) (SalesforceClient, error) {
 	return &BaseSalesforceClient{client}, nil
 }
 
+func (sf *BaseSalesforceClientFactory) NewSalesforceClient(config *config.Config) (SalesforceClient, error) {
+	return NewSalesforceClient(config)
+}
+
 type Case struct {
 	Id, CaseNumber, AccountId, Customer string
 }

pkg/common/test/client.go

@@ -1,10 +1,12 @@
 package test
 
 import (
+	"time"
+
 	files_sdk "github.com/Files-com/files-sdk-go"
 	"github.com/canonical/athena-core/pkg/common"
 	"github.com/canonical/athena-core/pkg/common/db"
-	"time"
+	"github.com/canonical/athena-core/pkg/config"
 )
 
 type SalesforceClient struct {
@@ -15,10 +17,22 @@ func (sf *SalesforceClient) GetCaseByNumber(number string) (*common.Case, error)
 	return nil, nil
 }
 
+type SalesforceClientFactory struct{}
+
+func (sf *SalesforceClientFactory) NewSalesforceClient(config *config.Config) (common.SalesforceClient, error) {
+	return &SalesforceClient{}, nil
+}
+
 type FilesComClient struct {
 	common.BaseFilesComClient
 }
 
+type FilesComClientFactory struct{}
+
+func (fc *FilesComClientFactory) NewFilesComClient(apiKey, endpoint string) (common.FilesComClient, error) {
+	return &FilesComClient{}, nil
+}
+
 var files = []db.File{
 	{Path: "/uploads/sosreport-testing-1.tar.xz"},
 	{Path: "/uploads/sosreport-testing-2.tar.xz"},

pkg/monitor/monitor.go

@@ -18,12 +18,12 @@ import (
 )
 
 type Monitor struct {
-	Db               *gorm.DB                // Database connection
-	Config           *config.Config          // Configuration instance
-	FilesClient      common.FilesComClient   // Files.com client
-	SalesforceClient common.SalesforceClient // SalesForce client
-	Provider         pubsub.Provider         // Messaging provider
-	mu               *sync.Mutex             // A mutex
+	Config                  *config.Config                 // Configuration instance
+	Db                      *gorm.DB                       // Database connection
+	FilesComClientFactory   common.FilesComClientFactory   // How to create a new Files.com client
+	mu                      *sync.Mutex                    // A mutex
+	Provider                pubsub.Provider                // Messaging provider
+	SalesforceClientFactory common.SalesforceClientFactory // How to create a new Salesforce client
 }
 
 func (m *Monitor) GetMatchingProcessors(filename string, c *common.Case) ([]string, error) {
@@ -50,14 +50,18 @@ func (m *Monitor) GetMatchingProcessors(filename string, c *common.Case) ([]stri
 		}
 	}
 	if len(processors) <= 0 {
-		return nil, fmt.Errorf("No processor found for file=%s", filename)
+		return nil, fmt.Errorf("no processor found for file=%s", filename)
 	}
 	return processors, nil
 }
 
 func (m *Monitor) GetLatestFiles(dirs []string, duration time.Duration) ([]db.File, error) {
 	log.Debugf("Getting files in %v", dirs)
-	files, err := m.FilesClient.GetFiles(dirs)
+	filesClient, err := m.FilesComClientFactory.NewFilesComClient(m.Config.FilesCom.Key, m.Config.FilesCom.Endpoint)
+	if err != nil {
+		panic(err)
+	}
+	files, err := filesClient.GetFiles(dirs)
 	if err != nil {
 		return nil, err
 	}
@@ -74,25 +78,19 @@ func (m *Monitor) GetMatchingProcessorByFile(files []db.File) (map[string][]db.F
 	var sfCase = &common.Case{}
 	var results = make(map[string][]db.File)
 
+	salesforceClient, err := m.SalesforceClientFactory.NewSalesforceClient(m.Config)
+	if err != nil {
+		panic(err)
+	}
+
 	for _, file := range files {
 		var processors []string
 
 		caseNumber, err := common.GetCaseNumberFromFilename(file.Path)
 		if err == nil {
-			sfCase, err = m.SalesforceClient.GetCaseByNumber(caseNumber)
+			sfCase, err = salesforceClient.GetCaseByNumber(caseNumber)
 			if err != nil {
-				// The SalesForce connection possibly died on us. Let's try to
-				// revive it and then try again.
-				log.Warn("Creating new SF client since current one is failing")
-				m.SalesforceClient, err = common.NewSalesforceClient(m.Config)
-				if err != nil {
-					log.Errorf("Failed to reconnect to salesforce: %s", err)
-					panic(err)
-				}
-				sfCase, err = m.SalesforceClient.GetCaseByNumber(caseNumber)
-				if err != nil {
-					log.Error(err)
-				}
+				log.Warningf("Failed to get a case from number: '%s'", caseNumber)
 			}
 		} else {
 			log.Warningf("Failed to identify case from filename '%s': %s", file.Path, err)
@@ -117,8 +115,9 @@ func (m *Monitor) GetMatchingProcessorByFile(files []db.File) (map[string][]db.F
 	return results, nil
 }
 
-func NewMonitor(filesClient common.FilesComClient, salesforceClient common.SalesforceClient, provider pubsub.Provider,
-	cfg *config.Config, dbConn *gorm.DB) (*Monitor, error) {
+func NewMonitor(provider pubsub.Provider, cfg *config.Config, dbConn *gorm.DB,
+	salesforceClientFactory common.SalesforceClientFactory,
+	filesComClientFactory common.FilesComClientFactory) (*Monitor, error) {
 	var err error
 	if dbConn == nil {
 		dbConn, err = db.GetDBConn(cfg)
@@ -128,12 +127,13 @@ func NewMonitor(filesClient common.FilesComClient, salesforceClient common.Sales
 	}
 
 	return &Monitor{
-		Provider:         provider,
-		Db:               dbConn,
-		FilesClient:      filesClient,
-		SalesforceClient: salesforceClient,
-		Config:           cfg,
-		mu:               new(sync.Mutex)}, nil
+		Config:                  cfg,
+		Db:                      dbConn,
+		FilesComClientFactory:   filesComClientFactory,
+		mu:                      new(sync.Mutex),
+		Provider:                provider,
+		SalesforceClientFactory: salesforceClientFactory,
+	}, nil
 }
 
 func (m *Monitor) PollNewFiles(ctx *context.Context, duration time.Duration) {
@@ -155,6 +155,11 @@ func (m *Monitor) PollNewFiles(ctx *context.Context, duration time.Duration) {
 		return
 	}
 
+	filesClient, err := m.FilesComClientFactory.NewFilesComClient(m.Config.FilesCom.Key, m.Config.FilesCom.Endpoint)
+	if err != nil {
+		panic(err)
+	}
+
 	log.Infof("Found %d new files, %d to be processed", len(latestFiles), len(processors))
 	for processor, files := range processors {
 		for _, file := range files {
@@ -175,7 +180,7 @@ func (m *Monitor) PollNewFiles(ctx *context.Context, duration time.Duration) {
 				}
 			}
 			log.Debugf("Using temporary base path: %s", basePath)
-			fileEntry, err := m.FilesClient.Download(&file, basePath)
+			fileEntry, err := filesClient.Download(&file, basePath)
 			if err != nil {
 				log.Errorf("Failed to download %s: %s - skipping", file.Path, err)
 				continue

pkg/monitor/monitor_test.go

@@ -35,7 +35,7 @@ func (s *MonitorTestSuite) SetupTest() {
 
 func (s *MonitorTestSuite) TestRunMonitor() {
 	provider := &memory.MemoryProvider{}
-	monitor, err := NewMonitor(&test.FilesComClient{}, &test.SalesforceClient{}, provider, s.config, s.db)
+	monitor, err := NewMonitor(provider, s.config, s.db, &test.SalesforceClientFactory{}, &test.FilesComClientFactory{})
 	assert.Nil(s.T(), err)
 	ctx, cancel := context.WithTimeout(context.Background(), 2*time.Second)
 	defer cancel()