Osquerybeat: Runner and Fetcher unit tests (#28290) (#28333)

* Runner and Fetcher unit tests

* Fix header formatting

* Tweak test

(cherry picked from commit 4acdaa7)

Co-authored-by: Aleksandr Maus <aleksandr.maus@elastic.co>

x-pack/osquerybeat/beater/osquery_runner_test.go

@@ -12,6 +12,8 @@ import (
 
 	"golang.org/x/sync/errgroup"
 
+	"github.com/google/go-cmp/cmp"
+
 	"github.com/elastic/beats/v7/libbeat/logp"
 	"github.com/elastic/beats/v7/x-pack/osquerybeat/internal/config"
 	"github.com/elastic/beats/v7/x-pack/osquerybeat/internal/osqd"
@@ -84,13 +86,92 @@ func TestOsqueryRunnerCancellable(t *testing.T) {
 	}
 
 	// Cancel
-	go func() {
-		cn()
-	}()
+	cn()
 
 	// Wait for runner stop
 	er := waitGroupWithTimeout(parentCtx, g, to)
 	if er != nil && !errors.Is(er, context.Canceled) {
 		t.Fatal("failed running:", er)
 	}
 }
+
+func TestOsqueryRunnerRestart(t *testing.T) {
+	to := 10 * time.Second
+
+	parentCtx := context.Background()
+	logger := logp.NewLogger("osquery_runner")
+
+	runCh := make(chan struct{}, 1)
+
+	var runs int
+
+	runfn := func(ctx context.Context, flags osqd.Flags, inputCh <-chan []config.InputConfig) error {
+		runs++
+		runCh <- struct{}{}
+		<-ctx.Done()
+		return nil
+	}
+
+	ctx, cn := context.WithCancel(parentCtx)
+	defer cn()
+
+	g, ctx := errgroup.WithContext(ctx)
+
+	// Start runner
+	runner := newOsqueryRunner(logger)
+	g.Go(func() error {
+		return runner.Run(ctx, runfn)
+	})
+
+	// Sent input that will start the runner function
+	runner.Update(ctx, nil)
+
+	// Wait for runner start
+	err := waitForStart(ctx, runCh, to)
+	if err != nil {
+		t.Fatal("failed starting:", err)
+	}
+
+	inputConfigs := []config.InputConfig{
+		{
+			Osquery: &config.OsqueryConfig{
+				Options: map[string]interface{}{
+					"foo": "bar",
+				},
+			},
+		},
+	}
+
+	// Update flags, this should restart the run function
+	runner.Update(ctx, inputConfigs)
+
+	// Should get another run
+	err = waitForStart(ctx, runCh, to)
+	if err != nil {
+		t.Fatal("failed starting after flags update:", err)
+	}
+
+	// Update with the same flags, should not restart the runner function
+	runner.Update(ctx, inputConfigs)
+
+	// Should timeout on waiting for another run
+	err = waitForStart(ctx, runCh, 300*time.Millisecond)
+	if err != context.DeadlineExceeded {
+		t.Fatal("unexpected error type after update with the same flags:", err)
+	}
+
+	// Cancel
+	cn()
+
+	// Wait for runner stop
+	er := waitGroupWithTimeout(parentCtx, g, to)
+	if er != nil && !errors.Is(er, context.Canceled) {
+		t.Fatal("failed running:", er)
+	}
+
+	// Check that there were total of 2 executions of run function
+	diff := cmp.Diff(2, runs)
+	if diff != "" {
+		t.Error(diff)
+	}
+}

x-pack/osquerybeat/internal/fetch/fetch.go

@@ -5,21 +5,31 @@
 package fetch
 
 import (
+	"context"
 	"fmt"
 	"io/ioutil"
 	"log"
 	"net/http"
 	"os"
+	"strings"
 
 	"github.com/elastic/beats/v7/x-pack/osquerybeat/internal/hash"
 )
 
-func Download(url, fp string) (hashout string, err error) {
+// Download downloads the osquery distro package
+// writes the content into a given filepath
+// returns the sha256 hash
+func Download(ctx context.Context, url, fp string) (hashout string, err error) {
 	log.Printf("Download %s to %s", url, fp)
 
 	cli := http.Client{}
 
-	res, err := cli.Get(url)
+	req, err := http.NewRequestWithContext(ctx, "GET", url, nil)
+	if err != nil {
+		return
+	}
+
+	res, err := cli.Do(req)
 	if err != nil {
 		return
 	}
@@ -32,7 +42,7 @@ func Download(url, fp string) (hashout string, err error) {
 		if err != nil {
 			log.Printf("Failed to read the error response body: %v", err)
 		} else {
-			s = string(b)
+			s = strings.TrimSpace(string(b))
 		}
 		return hashout, fmt.Errorf("failed fetch %s, status: %d, message: %s", url, res.StatusCode, s)
 	}

x-pack/osquerybeat/internal/fetch/fetch_test.go

@@ -0,0 +1,92 @@
+// Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
+// or more contributor license agreements. Licensed under the Elastic License;
+// you may not use this file except in compliance with the Elastic License.
+
+package fetch
+
+import (
+	"context"
+	"net/http"
+	"net/http/httptest"
+	"os"
+	"testing"
+
+	"github.com/gofrs/uuid"
+	"github.com/google/go-cmp/cmp"
+)
+
+func TestDownload(t *testing.T) {
+	ctx := context.Background()
+
+	localFilePathUUID := func() string {
+		return uuid.Must(uuid.NewV4()).String()
+	}
+	tests := []struct {
+		Name          string
+		Path          string
+		LocalFilePath string
+		Status        int
+		Payload       string
+		Hash          string
+		ErrStr        string
+	}{
+		{
+			Name:          "Http OK",
+			Path:          "/ok",
+			LocalFilePath: localFilePathUUID(),
+			Status:        http.StatusOK,
+			Payload:       "serenity now",
+			Hash:          "d1071dfdfd6a5bdf08d9b110f664731cf327cc3d341038f0739699690b599281",
+		},
+		{
+			Name:          "Http OK, empty local file path",
+			Path:          "/ok2",
+			LocalFilePath: "",
+			Status:        http.StatusOK,
+			Payload:       "serenity now",
+			Hash:          "d1071dfdfd6a5bdf08d9b110f664731cf327cc3d341038f0739699690b599281",
+			ErrStr:        "no such file or directory",
+		},
+		{
+			Name:          "Http not found",
+			Path:          "/notfound",
+			LocalFilePath: localFilePathUUID(),
+			Payload:       "file not found",
+			Status:        http.StatusNotFound,
+			ErrStr:        "file not found",
+		},
+	}
+
+	mux := http.NewServeMux()
+	for _, tc := range tests {
+		mux.HandleFunc(tc.Path, func(payload string, status int) func(w http.ResponseWriter, r *http.Request) {
+			return func(w http.ResponseWriter, r *http.Request) {
+				http.Error(w, payload, status)
+			}
+		}(tc.Payload, tc.Status))
+	}
+
+	svr := httptest.NewServer(mux)
+	defer svr.Close()
+
+	for _, tc := range tests {
+		t.Run(tc.Name, func(t *testing.T) {
+			hash, err := Download(ctx, svr.URL+tc.Path, tc.LocalFilePath)
+			defer os.Remove(tc.LocalFilePath)
+
+			if err != nil {
+				if tc.ErrStr == "" {
+					t.Fatal("unexpected download error:", err)
+				}
+				return
+			}
+
+			diff := cmp.Diff(tc.Hash, hash)
+			if diff != "" {
+				t.Fatal(diff)
+			}
+
+		})
+	}
+
+}

x-pack/osquerybeat/scripts/mage/distro.go

@@ -5,6 +5,7 @@
 package mage
 
 import (
+	"context"
 	"errors"
 	"fmt"
 	"io/ioutil"
@@ -121,7 +122,7 @@ func checkCacheAndFetch(osarch distro.OSArch, spec distro.Spec) (fetched bool, e
 		log.Printf("Hash mismatch, expected: %s, got: %s.", specHash, fileHash)
 	}
 
-	fileHash, err = fetch.Download(url, fp)
+	fileHash, err = fetch.Download(context.Background(), url, fp)
 	if err != nil {
 		log.Printf("File %s fetch failed, err: %v", url, err)
 		return