Do not re-use connections

Processor Edition 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. Issue: #177 Signed-off-by: Nicolas Bock <[email protected]>
canonical · Sep 13, 2024 · d254d5b · d254d5b
1 parent 0fa3247
commit d254d5b
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Showing 4 changed files with 93 additions and 84 deletions.
diff --git a/Dockerfile-debug b/Dockerfile-debug
@@ -1,7 +1,7 @@
 FROM ubuntu:24.04
 
-LABEL maintainer="Canonical Sustaining Engineering <edward.hope-morley@canonical.com>"
-LABEL org.opencontainers.image.description "Athena Monitor"
+LABEL maintainer="Canonical Sustaining Engineering <nicolas.bock@canonical.com>"
+LABEL org.opencontainers.image.description "Athena Debug Container"
 
 RUN apt-get update
 RUN DEBIAN_FRONTEND=noninteractive apt-get install --yes --no-install-recommends apt-utils

diff --git a/cmd/processor/main.go b/cmd/processor/main.go
@@ -41,32 +41,28 @@ 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)
 	}
 
-	p, err := processor.NewProcessor(filesClient, sfClient, natsClient, cfg, nil)
+	salesforceClientFactory := &common.BaseSalesforceClientFactory{}
+	filesComClientFactory := &common.BaseFilesComClientFactory{}
+
+	p, err := processor.NewProcessor(filesComClientFactory, salesforceClientFactory, natsClient, cfg, nil)
 	if err != nil {
 		panic(err)
 	}
 
 	ctx, cancel := context.WithCancel(context.Background())
 
-	if err := p.Run(ctx, func(fc common.FilesComClient, sf common.SalesforceClient, name, topic string,
+	if err := p.Run(ctx, func(
+		filesComClientFactory common.FilesComClientFactory,
+		salesforceClientFactory common.SalesforceClientFactory,
+		name, topic string,
 		reports map[string]config.Report, cfg *config.Config, dbConn *gorm.DB) pubsub.Subscriber {
 		log.Infof("Subscribing: %s - to topic: %s", name, topic)
-		return processor.NewBaseSubscriber(fc, sf, name, topic, reports, cfg, dbConn)
+		return processor.NewBaseSubscriber(filesComClientFactory, salesforceClientFactory, name, topic, reports, cfg, dbConn)
 	}); err != nil {
 		panic(err)
 	}

diff --git a/pkg/processor/processor.go b/pkg/processor/processor.go
@@ -23,22 +23,22 @@ import (
 )
 
 type Processor struct {
-	Config           *config.Config
-	Db               *gorm.DB
-	FilesClient      common.FilesComClient
-	Hostname         string
-	Provider         pubsub.Provider
-	SalesforceClient common.SalesforceClient
+	Config                  *config.Config
+	Db                      *gorm.DB
+	FilesComClientFactory   common.FilesComClientFactory
+	Hostname                string
+	Provider                pubsub.Provider
+	SalesforceClientFactory common.SalesforceClientFactory
 }
 
 type BaseSubscriber struct {
-	Config           *config.Config
-	Db               *gorm.DB
-	FilesComClient   common.FilesComClient
-	Name             string
-	Options          pubsub.HandlerOptions
-	Reports          map[string]config.Report
-	SalesforceClient common.SalesforceClient
+	Config                  *config.Config
+	Db                      *gorm.DB
+	FilesComClientFactory   common.FilesComClientFactory
+	Name                    string
+	Options                 pubsub.HandlerOptions
+	Reports                 map[string]config.Report
+	SalesforceClientFactory common.SalesforceClientFactory
 }
 
 func (s *BaseSubscriber) Setup(c *pubsub.Client) {
@@ -56,10 +56,10 @@ type ReportToExecute struct {
 type ReportRunner struct {
 	Config                    *config.Config
 	Db                        *gorm.DB
-	FilescomClient            common.FilesComClient
+	FilesComClientFactory     common.FilesComClientFactory
 	Name, Subscriber, Basedir string
 	Reports                   []ReportToExecute
-	SalesforceClient          common.SalesforceClient
+	SalesforceClientFactory   common.SalesforceClientFactory
 }
 
 func RunWithTimeout(baseDir string, timeout time.Duration, command string) ([]byte, error) {
@@ -118,36 +118,30 @@ func (runner *ReportRunner) UploadAndSaveReport(report *ReportToExecute, caseNum
 	log.Debugf("Fetching files for path '%s' from db", filePath)
 	result := runner.Db.Where("path = ?", filePath).First(&file)
 	if result.Error != nil {
-		return fmt.Errorf("File not found with path '%s' in database", filePath)
+		return fmt.Errorf("file not found with path '%s' in database", filePath)
 	}
 
 	log.Infof("Fetching case with number '%s' from Salesforce", caseNumber)
-	sfCase, err := runner.SalesforceClient.GetCaseByNumber(caseNumber)
+	salesforceClient, err := runner.SalesforceClientFactory.NewSalesforceClient(runner.Config)
 	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")
-		runner.SalesforceClient, err = common.NewSalesforceClient(runner.Config)
-		if err != nil {
-			log.Errorf("Failed to reconnect to salesforce: %s", err)
-			panic(err)
-		}
-		sfCase, err = runner.SalesforceClient.GetCaseByNumber(caseNumber)
-		if err != nil {
-			log.Error(err)
-			return err
-		}
+		log.Errorf("failed to get Salesforce connection: %s", err)
+		return err
+	}
+	sfCase, err := salesforceClient.GetCaseByNumber(caseNumber)
+	if err != nil {
+		log.Error(err)
+		return err
 	}
 
 	log.Debugf("Case %s successfully fetched from Salesforce", sfCase)
 	var newReport = new(db.Report)
 
-	newReport.Created = time.Now()
 	newReport.CaseID = sfCase.Id
-	newReport.FilePath = file.Path
+	newReport.Created = time.Now()
+	newReport.FileID = file.ID
 	newReport.FileName = filepath.Base(file.Path)
+	newReport.FilePath = file.Path
 	newReport.Name = report.Name
-	newReport.FileID = file.ID
 	newReport.Subscriber = report.Subscriber
 
 	if runner.Config.Processor.ReportsUploadPath == "" {
@@ -156,13 +150,18 @@ func (runner *ReportRunner) UploadAndSaveReport(report *ReportToExecute, caseNum
 		uploadPath = path.Join(runner.Config.Processor.ReportsUploadPath, newReport.FileName)
 	}
 
+	filesComClient, err := runner.FilesComClientFactory.NewFilesComClient(runner.Config.FilesCom.Key, runner.Config.FilesCom.Endpoint)
+	if err != nil {
+		log.Errorf("failed to get new file.com client: %s", err)
+		return err
+	}
 	log.Debugf("Uploading script output(s) to files.com")
 	for scriptName, output := range scriptOutputs {
 		dst_fname := fmt.Sprintf(DefaultReportOutputFormat, uploadPath, report.Name, scriptName)
 		log.Debugf("Uploading script output %s", dst_fname)
-		uploadedFilePath, err := runner.FilescomClient.Upload(string(output), dst_fname)
+		uploadedFilePath, err := filesComClient.Upload(string(output), dst_fname)
 		if err != nil {
-			return fmt.Errorf("Failed to upload file '%s': %s", dst_fname, err.Error())
+			return fmt.Errorf("failed to upload file '%s': %s", dst_fname, err.Error())
 		}
 
 		log.Debugf("Successfully uploaded file '%s'", uploadedFilePath.Path)
@@ -229,7 +228,10 @@ func renderTemplate(ctx *pongo2.Context, data string) (string, error) {
 	return out, nil
 }
 
-func NewReportRunner(cfg *config.Config, dbConn *gorm.DB, sf common.SalesforceClient, fc common.FilesComClient, subscriber, name string,
+func NewReportRunner(cfg *config.Config, dbConn *gorm.DB,
+	salesforceClientFactory common.SalesforceClientFactory,
+	filesComClientFactory common.FilesComClientFactory,
+	subscriber, name string,
 	file *db.File, reports map[string]config.Report) (*ReportRunner, error) {
 
 	var reportRunner ReportRunner
@@ -259,13 +261,13 @@ func NewReportRunner(cfg *config.Config, dbConn *gorm.DB, sf common.SalesforceCl
 	}
 	log.Debugf("Moved file to %s", dir)
 
-	reportRunner.Config = cfg
-	reportRunner.Subscriber = subscriber
-	reportRunner.Name = name
 	reportRunner.Basedir = dir
+	reportRunner.Config = cfg
 	reportRunner.Db = dbConn
-	reportRunner.SalesforceClient = sf
-	reportRunner.FilescomClient = fc
+	reportRunner.FilesComClientFactory = filesComClientFactory
+	reportRunner.Name = name
+	reportRunner.SalesforceClientFactory = salesforceClientFactory
+	reportRunner.Subscriber = subscriber
 
 	//TODO: document the template variables
 	tplContext := pongo2.Context{
@@ -277,7 +279,7 @@ func NewReportRunner(cfg *config.Config, dbConn *gorm.DB, sf common.SalesforceCl
 	var scripts = make(map[string]string)
 
 	for reportName, report := range reports {
-		log.Debugf("Running %s script(s) (num=%d)", reportName, len(report.Scripts))
+		log.Debugf("running %d '%s' script(s)", len(report.Scripts), reportName)
 		for scriptName, script := range report.Scripts {
 			if script.Run == "" {
 				log.Errorf("No script provided to run on '%s'", scriptName)
@@ -313,13 +315,13 @@ func NewReportRunner(cfg *config.Config, dbConn *gorm.DB, sf common.SalesforceCl
 		}
 
 		reportToExecute := ReportToExecute{}
-		reportToExecute.Timeout = timeout
 		reportToExecute.BaseDir = reportRunner.Basedir
-		reportToExecute.Subscriber = reportRunner.Subscriber
-		reportToExecute.Name = reportName
 		reportToExecute.File = file
 		reportToExecute.FileName = file.Path
+		reportToExecute.Name = reportName
 		reportToExecute.Scripts = scripts
+		reportToExecute.Subscriber = reportRunner.Subscriber
+		reportToExecute.Timeout = timeout
 		reportRunner.Reports = append(reportRunner.Reports, reportToExecute)
 	}
 
@@ -336,7 +338,7 @@ func (runner *ReportRunner) Clean() error {
 }
 
 func (s *BaseSubscriber) Handler(_ context.Context, file *db.File, msg *pubsub.Msg) error {
-	runner, err := NewReportRunner(s.Config, s.Db, s.SalesforceClient, s.FilesComClient, s.Name, s.Options.Topic, file, s.Reports)
+	runner, err := NewReportRunner(s.Config, s.Db, s.SalesforceClientFactory, s.FilesComClientFactory, s.Name, s.Options.Topic, file, s.Reports)
 	if err != nil {
 		log.Errorf("Failed to get new runner: %s", err)
 		msg.Ack()
@@ -354,7 +356,8 @@ func (s *BaseSubscriber) Handler(_ context.Context, file *db.File, msg *pubsub.M
 
 const defaultHandlerDeadline = 10 * time.Minute
 
-func NewBaseSubscriber(filesClient common.FilesComClient, salesforceClient common.SalesforceClient,
+func NewBaseSubscriber(
+	filesComClientFactory common.FilesComClientFactory, salesforceClientFactory common.SalesforceClientFactory,
 	name, topic string, reports map[string]config.Report, cfg *config.Config, dbConn *gorm.DB) *BaseSubscriber {
 	var subscriber = BaseSubscriber{
 		Options: pubsub.HandlerOptions{
@@ -363,19 +366,21 @@ func NewBaseSubscriber(filesClient common.FilesComClient, salesforceClient commo
 			AutoAck:  false,
 			JSON:     true,
 			Deadline: defaultHandlerDeadline,
-		}, Reports: reports,
+		},
+		Reports: reports,
 	}
 
-	subscriber.FilesComClient = filesClient
-	subscriber.SalesforceClient = salesforceClient
-	subscriber.Options.Handler = subscriber.Handler
 	subscriber.Config = cfg
-	subscriber.Name = topic
 	subscriber.Db = dbConn
+	subscriber.FilesComClientFactory = filesComClientFactory
+	subscriber.Name = topic
+	subscriber.Options.Handler = subscriber.Handler
+	subscriber.SalesforceClientFactory = salesforceClientFactory
 	return &subscriber
 }
 
-func NewProcessor(filesClient common.FilesComClient, salesforceClient common.SalesforceClient,
+func NewProcessor(
+	filesComClientFactory common.FilesComClientFactory, salesforceClientFactory common.SalesforceClientFactory,
 	provider pubsub.Provider, cfg *config.Config, dbConn *gorm.DB) (*Processor, error) {
 	var err error
 	if dbConn == nil {
@@ -391,12 +396,12 @@ func NewProcessor(filesClient common.FilesComClient, salesforceClient common.Sal
 	}
 
 	return &Processor{
-		Config:           cfg,
-		Db:               dbConn,
-		FilesClient:      filesClient,
-		Hostname:         hostname,
-		Provider:         provider,
-		SalesforceClient: salesforceClient,
+		Config:                  cfg,
+		Db:                      dbConn,
+		FilesComClientFactory:   filesComClientFactory,
+		Hostname:                hostname,
+		Provider:                provider,
+		SalesforceClientFactory: salesforceClientFactory,
 	}, nil
 }
 
@@ -477,6 +482,11 @@ func (p *Processor) BatchSalesforceComments(ctx *context.Context, interval time.
 		reportMap[report.Subscriber][report.CaseID][report.Name] = append(reportMap[report.Subscriber][report.CaseID][report.Name], report)
 	}
 
+	salesforceClient, err := p.SalesforceClientFactory.NewSalesforceClient(p.Config)
+	if err != nil {
+		log.Errorf("failed to get Salesforce client: %s", err)
+		return
+	}
 	for subscriberName, caseMap := range reportMap {
 		for caseId, reportsByType := range caseMap {
 			for _, reports := range reportsByType {
@@ -515,10 +525,10 @@ func (p *Processor) BatchSalesforceComments(ctx *context.Context, interval time.
 					}
 					var comment *simpleforce.SObject
 					if p.Config.Salesforce.EnableChatter {
-						comment = p.SalesforceClient.PostChatter(caseId,
+						comment = salesforceClient.PostChatter(caseId,
 							chunkHeader+chunk, subscriber.SFCommentIsPublic)
 					} else {
-						comment = p.SalesforceClient.PostComment(caseId,
+						comment = salesforceClient.PostComment(caseId,
 							chunkHeader+chunk, subscriber.SFCommentIsPublic)
 					}
 					if comment == nil {
@@ -538,8 +548,11 @@ func (p *Processor) BatchSalesforceComments(ctx *context.Context, interval time.
 	}
 }
 
-func (p *Processor) Run(ctx context.Context, newSubscriberFn func(filesClient common.FilesComClient,
-	salesforceClient common.SalesforceClient, name, topic string, reports map[string]config.Report, cfg *config.Config, dbConn *gorm.DB) pubsub.Subscriber) error {
+func (p *Processor) Run(ctx context.Context, newSubscriberFn func(
+	filesComClientFactory common.FilesComClientFactory,
+	salesforceClientFactory common.SalesforceClientFactory,
+	name, topic string, reports map[string]config.Report,
+	cfg *config.Config, dbConn *gorm.DB) pubsub.Subscriber) error {
 
 	if ctx == nil {
 		var cancel context.CancelFunc
@@ -554,7 +567,8 @@ func (p *Processor) Run(ctx context.Context, newSubscriberFn func(filesClient co
 	})
 
 	for event := range p.Config.Processor.SubscribeTo {
-		go pubsub.Subscribe(newSubscriberFn(p.FilesClient, p.SalesforceClient, p.Hostname, event, p.getReportsByTopic(event), p.Config, p.Db))
+		go pubsub.Subscribe(newSubscriberFn(p.FilesComClientFactory, p.SalesforceClientFactory,
+			p.Hostname, event, p.getReportsByTopic(event), p.Config, p.Db))
 	}
 
 	interval, err := time.ParseDuration(p.Config.Processor.BatchCommentsEvery)

diff --git a/pkg/processor/processor_test.go b/pkg/processor/processor_test.go
@@ -48,11 +48,8 @@ func (s *MockSubscriber) Setup(c *pubsub.Client) {
 }
 
 func (s *ProcessorTestSuite) TestRunProcessor() {
-	filesComClient := test.FilesComClient{}
-	salesforceClient := test.SalesforceClient{}
-
 	provider := &memory.MemoryProvider{}
-	processor, _ := NewProcessor(&filesComClient, &salesforceClient, provider, s.config, s.db)
+	processor, _ := NewProcessor(&test.FilesComClientFactory{}, &test.SalesforceClientFactory{}, provider, s.config, s.db)
 
 	ctx, cancel := context.WithTimeout(context.Background(), 1*time.Second)
 	defer cancel()
@@ -67,7 +64,9 @@ func (s *ProcessorTestSuite) TestRunProcessor() {
 
 	var called = 0
 
-	_ = processor.Run(ctx, func(fc common.FilesComClient, sf common.SalesforceClient,
+	_ = processor.Run(ctx, func(
+		filesComClientFactory common.FilesComClientFactory,
+		salesforceClientFactory common.SalesforceClientFactory,
 		name string, topic string, reports map[string]config.Report, cfg *config.Config, dbConn *gorm.DB) pubsub.Subscriber {
 		var subscriber = MockSubscriber{Options: pubsub.HandlerOptions{
 			Topic:   topic,