Remove reroute processors from coverage reports (#1647)

Remove the reroute processors from the pipeline stats to generate
the coverage reports. And at the same time, to be able to use the
right lines in the coverage reports, it is needed to keep the original
contents (the ones read from the file) of the pipeline.

internal/elasticsearch/ingest/datastream.go

@@ -98,17 +98,18 @@ func loadIngestPipelineFiles(dataStreamPath string, nonce int64) ([]Pipeline, er
 			return nil, err
 		}
 
-		c, err = addRerouteProcessors(c, dataStreamPath, path)
+		cWithRerouteProcessors, err := addRerouteProcessors(c, dataStreamPath, path)
 		if err != nil {
 			return nil, err
 		}
 
 		name := filepath.Base(path)
 		pipelines = append(pipelines, Pipeline{
-			Path:    path,
-			Name:    getPipelineNameWithNonce(name[:strings.Index(name, ".")], nonce),
-			Format:  filepath.Ext(path)[1:],
-			Content: c,
+			Path:            path,
+			Name:            getPipelineNameWithNonce(name[:strings.Index(name, ".")], nonce),
+			Format:          filepath.Ext(path)[1:],
+			Content:         cWithRerouteProcessors,
+			ContentOriginal: c,
 		})
 	}
 	return pipelines, nil

internal/elasticsearch/ingest/pipeline.go

@@ -36,10 +36,11 @@ type pipelineIngestedDocument struct {
 
 // Pipeline represents a pipeline resource loaded from a file
 type Pipeline struct {
-	Path    string // Path of the file with the pipeline definition.
-	Name    string // Name of the pipeline.
-	Format  string // Format (extension) of the pipeline.
-	Content []byte // Content is the original file contents.
+	Path            string // Path of the file with the pipeline definition.
+	Name            string // Name of the pipeline.
+	Format          string // Format (extension) of the pipeline.
+	Content         []byte // Content is the pipeline file contents with reroute processors if any.
+	ContentOriginal []byte // Content is the original file contents.
 }
 
 // Filename returns the original filename associated with the pipeline.

internal/elasticsearch/ingest/processors.go

@@ -36,6 +36,20 @@ func (p Pipeline) Processors() (procs []Processor, err error) {
 	return procs, nil
 }
 
+// OriginalProcessors return the original list of processors in an ingest pipeline.
+func (p Pipeline) OriginalProcessors() (procs []Processor, err error) {
+	switch p.Format {
+	case "yaml", "yml", "json":
+		procs, err = processorsFromYAML(p.ContentOriginal)
+	default:
+		return nil, fmt.Errorf("unsupported pipeline format: %s", p.Format)
+	}
+	if err != nil {
+		return nil, fmt.Errorf("failure processing %s pipeline '%s': %w", p.Format, p.Filename(), err)
+	}
+	return procs, nil
+}
+
 // extract a list of processors from a pipeline definition in YAML format.
 func processorsFromYAML(content []byte) (procs []Processor, err error) {
 	var p struct {

internal/testrunner/runners/pipeline/coverage.go

@@ -105,7 +105,7 @@ func GetPipelineCoverage(options testrunner.TestOptions, pipelines []ingest.Pipe
 
 func pipelineDataForCoverage(pipeline ingest.Pipeline, stats ingest.PipelineStatsMap, basePath, dataStreamPath string) (string, string, []ingest.Processor, ingest.PipelineStats, error) {
 	// Load the list of main processors from the pipeline source code, annotated with line numbers.
-	src, err := pipeline.Processors()
+	src, err := pipeline.OriginalProcessors()
 	if err != nil {
 		return "", "", nil, ingest.PipelineStats{}, err
 	}
@@ -115,6 +115,17 @@ func pipelineDataForCoverage(pipeline ingest.Pipeline, stats ingest.PipelineStat
 		return "", "", nil, ingest.PipelineStats{}, fmt.Errorf("pipeline '%s' not installed in Elasticsearch", pipeline.Name)
 	}
 
+	// Remove reroute processors if any so the pipeline has the same processors as in the file
+	// reroute processors are added if there are any routing_rules file defined
+	var processors []ingest.ProcessorStats
+	for _, proc := range pstats.Processors {
+		if proc.Type == "reroute" {
+			continue
+		}
+		processors = append(processors, proc)
+	}
+	pstats.Processors = processors
+
 	// Ensure there is no inconsistency in the list of processors in stats vs obtained from source.
 	if len(src) != len(pstats.Processors) {
 		return "", "", nil, ingest.PipelineStats{}, fmt.Errorf("processor count mismatch for %s (src:%d stats:%d)", pipeline.Filename(), len(src), len(pstats.Processors))