feat: add concurrency option to parallelize package loading (#778)

* feat: add concurrency option to parallelize package loading

* refactor: move wg.add inside the for loop

* fix: gracefully stop the workers on error

* test: add test for concurrent scan

analyzer.go

@@ -29,6 +29,7 @@ import (
 	"regexp"
 	"strconv"
 	"strings"
+	"sync"
 
 	"golang.org/x/tools/go/packages"
 )
@@ -88,6 +89,7 @@ type Analyzer struct {
 	excludeGenerated  bool
 	showIgnored       bool
 	trackSuppressions bool
+	concurrency       int
 }
 
 // SuppressionInfo object is to record the kind and the justification that used
@@ -98,7 +100,7 @@ type SuppressionInfo struct {
 }
 
 // NewAnalyzer builds a new analyzer.
-func NewAnalyzer(conf Config, tests bool, excludeGenerated bool, trackSuppressions bool, logger *log.Logger) *Analyzer {
+func NewAnalyzer(conf Config, tests bool, excludeGenerated bool, trackSuppressions bool, concurrency int, logger *log.Logger) *Analyzer {
 	ignoreNoSec := false
 	if enabled, err := conf.IsGlobalEnabled(Nosec); err == nil {
 		ignoreNoSec = enabled
@@ -121,6 +123,7 @@ func NewAnalyzer(conf Config, tests bool, excludeGenerated bool, trackSuppressio
 		stats:             &Metrics{},
 		errors:            make(map[string][]Error),
 		tests:             tests,
+		concurrency:       concurrency,
 		excludeGenerated:  excludeGenerated,
 		trackSuppressions: trackSuppressions,
 	}
@@ -153,15 +156,64 @@ func (gosec *Analyzer) Process(buildTags []string, packagePaths ...string) error
 		Tests:      gosec.tests,
 	}
 
-	for _, pkgPath := range packagePaths {
-		pkgs, err := gosec.load(pkgPath, config)
-		if err != nil {
-			gosec.AppendError(pkgPath, err)
+	type result struct {
+		pkgPath string
+		pkgs    []*packages.Package
+		err     error
+	}
+
+	results := make(chan result)
+	jobs := make(chan string, len(packagePaths))
+	quit := make(chan struct{})
+
+	var wg sync.WaitGroup
+
+	worker := func(j chan string, r chan result, quit chan struct{}) {
+		for {
+			select {
+			case s := <-j:
+				packages, err := gosec.load(s, config)
+				select {
+				case r <- result{pkgPath: s, pkgs: packages, err: err}:
+				case <-quit:
+					// we've been told to stop, probably an error while
+					// processing a previous result.
+					wg.Done()
+					return
+				}
+			default:
+				// j is empty and there are no jobs left
+				wg.Done()
+				return
+			}
 		}
-		for _, pkg := range pkgs {
+	}
+
+	// fill the buffer
+	for _, pkgPath := range packagePaths {
+		jobs <- pkgPath
+	}
+
+	for i := 0; i < gosec.concurrency; i++ {
+		wg.Add(1)
+		go worker(jobs, results, quit)
+	}
+
+	go func() {
+		wg.Wait()
+		close(results)
+	}()
+
+	for r := range results {
+		if r.err != nil {
+			gosec.AppendError(r.pkgPath, r.err)
+		}
+		for _, pkg := range r.pkgs {
 			if pkg.Name != "" {
 				err := gosec.ParseErrors(pkg)
 				if err != nil {
+					close(quit)
+					wg.Wait() // wait for the goroutines to stop
 					return fmt.Errorf("parsing errors in pkg %q: %w", pkg.Name, err)
 				}
 				gosec.Check(pkg)

analyzer_test.go

@@ -24,7 +24,7 @@ var _ = Describe("Analyzer", func() {
 	)
 	BeforeEach(func() {
 		logger, _ = testutils.NewLogger()
-		analyzer = gosec.NewAnalyzer(nil, tests, false, false, logger)
+		analyzer = gosec.NewAnalyzer(nil, tests, false, false, 1, logger)
 	})
 
 	Context("when processing a package", func() {
@@ -77,6 +77,29 @@ var _ = Describe("Analyzer", func() {
 			Expect(metrics.NumFiles).To(Equal(2))
 		})
 
+		It("should be able to analyze multiple Go files concurrently", func() {
+			customAnalyzer := gosec.NewAnalyzer(nil, true, true, false, 32, logger)
+			customAnalyzer.LoadRules(rules.Generate(false).RulesInfo())
+			pkg := testutils.NewTestPackage()
+			defer pkg.Close()
+			pkg.AddFile("foo.go", `
+				package main
+				func main(){
+					bar()
+				}`)
+			pkg.AddFile("bar.go", `
+				package main
+				func bar(){
+					println("package has two files!")
+				}`)
+			err := pkg.Build()
+			Expect(err).ShouldNot(HaveOccurred())
+			err = customAnalyzer.Process(buildTags, pkg.Path)
+			Expect(err).ShouldNot(HaveOccurred())
+			_, metrics, _ := customAnalyzer.Report()
+			Expect(metrics.NumFiles).To(Equal(2))
+		})
+
 		It("should be able to analyze multiple Go packages", func() {
 			analyzer.LoadRules(rules.Generate(false).RulesInfo())
 			pkg1 := testutils.NewTestPackage()
@@ -262,7 +285,7 @@ var _ = Describe("Analyzer", func() {
 			// overwrite nosec option
 			nosecIgnoreConfig := gosec.NewConfig()
 			nosecIgnoreConfig.SetGlobal(gosec.Nosec, "true")
-			customAnalyzer := gosec.NewAnalyzer(nosecIgnoreConfig, tests, false, false, logger)
+			customAnalyzer := gosec.NewAnalyzer(nosecIgnoreConfig, tests, false, false, 1, logger)
 			customAnalyzer.LoadRules(rules.Generate(false, rules.NewRuleFilter(false, "G401")).RulesInfo())
 
 			nosecPackage := testutils.NewTestPackage()
@@ -286,7 +309,7 @@ var _ = Describe("Analyzer", func() {
 			nosecIgnoreConfig := gosec.NewConfig()
 			nosecIgnoreConfig.SetGlobal(gosec.Nosec, "true")
 			nosecIgnoreConfig.SetGlobal(gosec.ShowIgnored, "true")
-			customAnalyzer := gosec.NewAnalyzer(nosecIgnoreConfig, tests, false, false, logger)
+			customAnalyzer := gosec.NewAnalyzer(nosecIgnoreConfig, tests, false, false, 1, logger)
 			customAnalyzer.LoadRules(rules.Generate(false, rules.NewRuleFilter(false, "G401")).RulesInfo())
 
 			nosecPackage := testutils.NewTestPackage()
@@ -379,7 +402,7 @@ var _ = Describe("Analyzer", func() {
 			// overwrite nosec option
 			nosecIgnoreConfig := gosec.NewConfig()
 			nosecIgnoreConfig.SetGlobal(gosec.NoSecAlternative, "#falsePositive")
-			customAnalyzer := gosec.NewAnalyzer(nosecIgnoreConfig, tests, false, false, logger)
+			customAnalyzer := gosec.NewAnalyzer(nosecIgnoreConfig, tests, false, false, 1, logger)
 			customAnalyzer.LoadRules(rules.Generate(false, rules.NewRuleFilter(false, "G401")).RulesInfo())
 
 			nosecPackage := testutils.NewTestPackage()
@@ -402,7 +425,7 @@ var _ = Describe("Analyzer", func() {
 			// overwrite nosec option
 			nosecIgnoreConfig := gosec.NewConfig()
 			nosecIgnoreConfig.SetGlobal(gosec.NoSecAlternative, "#falsePositive")
-			customAnalyzer := gosec.NewAnalyzer(nosecIgnoreConfig, tests, false, false, logger)
+			customAnalyzer := gosec.NewAnalyzer(nosecIgnoreConfig, tests, false, false, 1, logger)
 			customAnalyzer.LoadRules(rules.Generate(false, rules.NewRuleFilter(false, "G401")).RulesInfo())
 
 			nosecPackage := testutils.NewTestPackage()
@@ -418,7 +441,7 @@ var _ = Describe("Analyzer", func() {
 		})
 
 		It("should be able to analyze Go test package", func() {
-			customAnalyzer := gosec.NewAnalyzer(nil, true, false, false, logger)
+			customAnalyzer := gosec.NewAnalyzer(nil, true, false, false, 1, logger)
 			customAnalyzer.LoadRules(rules.Generate(false).RulesInfo())
 			pkg := testutils.NewTestPackage()
 			defer pkg.Close()
@@ -443,7 +466,7 @@ var _ = Describe("Analyzer", func() {
 			Expect(issues).Should(HaveLen(1))
 		})
 		It("should be able to scan generated files if NOT excluded", func() {
-			customAnalyzer := gosec.NewAnalyzer(nil, true, false, false, logger)
+			customAnalyzer := gosec.NewAnalyzer(nil, true, false, false, 1, logger)
 			customAnalyzer.LoadRules(rules.Generate(false).RulesInfo())
 			pkg := testutils.NewTestPackage()
 			defer pkg.Close()
@@ -464,7 +487,7 @@ var _ = Describe("Analyzer", func() {
 			Expect(issues).Should(HaveLen(1))
 		})
 		It("should be able to skip generated files if excluded", func() {
-			customAnalyzer := gosec.NewAnalyzer(nil, true, true, false, logger)
+			customAnalyzer := gosec.NewAnalyzer(nil, true, true, false, 1, logger)
 			customAnalyzer.LoadRules(rules.Generate(false).RulesInfo())
 			pkg := testutils.NewTestPackage()
 			defer pkg.Close()
@@ -671,7 +694,7 @@ var _ = Describe("Analyzer", func() {
 
 	Context("when tracking suppressions", func() {
 		BeforeEach(func() {
-			analyzer = gosec.NewAnalyzer(nil, tests, false, true, logger)
+			analyzer = gosec.NewAnalyzer(nil, tests, false, true, 1, logger)
 		})
 
 		It("should not report an error if the violation is suppressed", func() {

cmd/gosec/main.go

@@ -20,6 +20,7 @@ import (
 	"io/ioutil"
 	"log"
 	"os"
+	"runtime"
 	"sort"
 	"strings"
 
@@ -114,6 +115,9 @@ var (
 	// fail by confidence
 	flagConfidence = flag.String("confidence", "low", "Filter out the issues with a lower confidence than the given value. Valid options are: low, medium, high")
 
+	// concurrency value
+	flagConcurrency = flag.Int("concurrency", runtime.NumCPU(), "Concurrency value")
+
 	// do not fail
 	flagNoFail = flag.Bool("no-fail", false, "Do not fail the scanning, even if issues were found")
 
@@ -371,7 +375,7 @@ func main() {
 	}
 
 	// Create the analyzer
-	analyzer := gosec.NewAnalyzer(config, *flagScanTests, *flagExcludeGenerated, *flagTrackSuppressions, logger)
+	analyzer := gosec.NewAnalyzer(config, *flagScanTests, *flagExcludeGenerated, *flagTrackSuppressions, *flagConcurrency, logger)
 	analyzer.LoadRules(ruleList.RulesInfo())
 
 	excludedDirs := gosec.ExcludedDirsRegExp(flagDirsExclude)

rules/rules_test.go

@@ -24,7 +24,7 @@ var _ = Describe("gosec rules", func() {
 	BeforeEach(func() {
 		logger, _ = testutils.NewLogger()
 		config = gosec.NewConfig()
-		analyzer = gosec.NewAnalyzer(config, tests, false, false, logger)
+		analyzer = gosec.NewAnalyzer(config, tests, false, false, 1, logger)
 		runner = func(rule string, samples []testutils.CodeSample) {
 			for n, sample := range samples {
 				analyzer.Reset()