github.com/verrazzano/verrazzano@v1.7.0/tools/vz/pkg/analysis/internal/util/cluster/analyzer.go

// Copyright (c) 2021, 2023, Oracle and/or its affiliates.
// Licensed under the Universal Permissive License v 1.0 as shown at https://oss.oracle.com/licenses/upl.

// Package cluster handles cluster analysis
package cluster

import (
	"fmt"
	"os"
	"regexp"

	"github.com/verrazzano/verrazzano/tools/vz/pkg/analysis/internal/util/files"
	"github.com/verrazzano/verrazzano/tools/vz/pkg/analysis/internal/util/report"
	"go.uber.org/zap"
)

// TBD: Overall the intention/design is that we could execute analysis in parallel if we want to do that in the
//
//	future. So in general analyzers are independent of each other and thread safe, and not expecting to
//	be executed in a particular order.
//	However, there may be special cases where we want an analysis to be done and information gleaned
//	from that analysis to be available to other analyzers. For example, the analysis of the state
//	of Verrazzano is something that is likely to fall into that category. It will make a high level
//	determination of where in the lifecycle we are at, and other analyzers may need to easily get that
//	information to give better guidance on the issues/actions.
//
//	The current implementation is calling the analyzers serially in order.
//	If we do decide to handle analysis in a parallel fashion later, we likely will need to have some
//	analyzers called deterministically in exact order before we fire off other analyzers in parallel.
//	So we may break this into 2 lists in the future: serial analysis functions, parallel analysis functions
//	Analyzers that may fall into this category should be annotated, with a comment, there currently is only
//	one that may require that.

// These are the high level analysis functions that are called. The "Runtime Issues" maps to only certificate functions currently.
var clusterAnalysisFunctions = map[string]func(log *zap.SugaredLogger, directory string) (err error){
	"Verrazzano Status":  AnalyzeVerrazzano, // Execute first, this may share data other analyzers can use
	"Pod Related Issues": AnalyzePodIssues,
	"Rancher Status":     AnalyzeRancher,
	"Runtime Issues":     AnalyzeCertificateRelatedIssues,
	"Cluster API Issues": AnalyzeClusterAPI,
}

// ClusterDumpDirectoriesRe is used for finding cluster-snapshot directory name matches
var ClusterDumpDirectoriesRe = regexp.MustCompile(`.*/cluster-snapshot$`)

// LogFilesMatchRe is used for finding pod log files in a cluster dump
var LogFilesMatchRe = regexp.MustCompile(`logs.txt`)

// PodFilesMatchRe is used for finding pod files in a cluster dump
var PodFilesMatchRe = regexp.MustCompile(`pods.json`)

// ErrorSearchRe is used for searching for case insensitive "error". This is useful when we know there is a
// problem lurking but we can't identify the specific issue and are trying to capture relevant information
// to include in support data from logs and events
var ErrorSearchRe = regexp.MustCompile(`(?i).*error.*`)

// WideErrorSearchRe is used for casting a wider net while looking for issues TBD: .*ERROR.*|.*Error.*|.*FAILED.*
var WideErrorSearchRe = regexp.MustCompile(`(?i).*error.*|.*failed.*`)

// EventReasonFailedRe is used for finding event reason failures
var EventReasonFailedRe = regexp.MustCompile(`.*Failed.*`)

// RunAnalysis is the main entry analysis function
func RunAnalysis(log *zap.SugaredLogger, rootDirectory string) (err error) {
	log.Debugf("Cluster Analyzer runAnalysis on %s", rootDirectory)

	clusterRoots, err := files.GetMatchingDirectories(log, rootDirectory, ClusterDumpDirectoriesRe)
	if err != nil {
		log.Debugf("Cluster Analyzer runAnalysis failed examining directories for %s", rootDirectory, err)
		return fmt.Errorf("Cluster Analyzer runAnalysis failed examining directories for %s", rootDirectory)
	}
	if len(clusterRoots) == 0 {
		log.Debugf("Cluster Analyzer runAnalysis didn't find any clusters to analyze for %s", rootDirectory)
		return fmt.Errorf("Cluster Analyzer runAnalysis didn't find any clusters to analyze for %s", rootDirectory)
	}

	for _, clusterRoot := range clusterRoots {
		// Ignore directories if they don't contain snapshots. Checking if verrazzano-resources.json exists in the dir
		// that implies the directory has the required snapshots.
		vzResourcesPath := files.FindFileInClusterRoot(clusterRoot, verrazzanoResource)
		fileInfo, e := os.Stat(vzResourcesPath)
		if e != nil || fileInfo.Size() == 0 {
			log.Debugf("Verrazzano resource file %s is either empty or not there", vzResourcesPath)
			continue
		}
		analyzeCluster(log, clusterRoot)
	}

	return nil
}

func analyzeCluster(log *zap.SugaredLogger, clusterRoot string) (err error) {
	log.Debugf("analyzeCluster called for %s", clusterRoot)
	report.AddSourceAnalyzed(clusterRoot)

	for functionName, function := range clusterAnalysisFunctions {
		err := function(log, clusterRoot)
		if err != nil {
			// Log the error and continue on
			log.Errorf("Error processing analysis function %s", functionName, err)
		}
	}

	return nil
}