✨ Follow full jdtls log with logLevel>6 (#1039)

When logLevel is over default 5, follow full jdtls log in order to
provide full exhaustive java logging for possible debugging (which is
filtered by default since it could be ~100MBs).

Follow-up to #1038

Related to #1032

<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit

* **Features**
* Added a log level setting for the Java external provider to adjust
verbosity and enable full log following at higher levels.

* **Improvements**
* Log tailing now uses workspace-relative log paths for more reliable
discovery.
* When full log following is enabled, the provider emits an
informational message and logs all JDTLS lines; otherwise it filters for
designated markers.

<sub>✏️ Tip: You can customize this high-level summary in your review
settings.</sub>
<!-- end of auto-generated comment: release notes by coderabbit.ai -->

---------

Signed-off-by: Marek Aufart <maufart@redhat.com>
Signed-off-by: Marek Aufart <aufi.cz@gmail.com>

Author: aufi

external-providers/java-external-provider/main.go

@@ -38,8 +38,19 @@ func main() {
 	log := logrusr.New(logrusLog)
 	log = log.WithName("java-provider")
 
+	// Get log level value
+	logLevelValue := 5
+	if logLevel != nil {
+		logLevelValue = *logLevel
+	}
+
 	// must use lspServerName for use of multiple grpc providers
-	client := java.NewJavaProvider(log, *lspServerName, *contextLines, provider.Config{})
+	client := java.NewJavaProvider(log, *lspServerName, *contextLines, logLevelValue, provider.Config{})
+
+	if logLevel != nil && *logLevel != 5 {
+		logrusLog.SetLevel(logrus.Level(*logLevel))
+	}
+
 	if (socket == nil || *socket == "") && (port == nil || *port == 0) {
 		log.Error(fmt.Errorf("no serving location"), "port or socket must be set.")
 		panic(1)

external-providers/java-external-provider/pkg/java_external_provider/provider.go

@@ -122,6 +122,7 @@ type javaProvider struct {
 	depsLocationCache map[string]int
 
 	logFollow sync.Once
+	logLevel  int
 }
 
 var _ provider.BaseClient = &javaProvider{}
@@ -151,7 +152,7 @@ type element struct {
 	Value string `yaml:"value" json:"value"` // can be a (java) regex pattern
 }
 
-func NewJavaProvider(log logr.Logger, lspServerName string, contextLines int, config provider.Config) *javaProvider {
+func NewJavaProvider(log logr.Logger, lspServerName string, contextLines int, logLevel int, config provider.Config) *javaProvider {
 
 	_, mvnBinaryError := exec.LookPath("mvn")
 
@@ -165,6 +166,7 @@ func NewJavaProvider(log logr.Logger, lspServerName string, contextLines int, co
 		contextLines:      contextLines,
 		encoding:          "",
 		logFollow:         sync.Once{},
+		logLevel:          logLevel,
 	}
 }
 
@@ -565,7 +567,10 @@ func (p *javaProvider) Init(ctx context.Context, log logr.Logger, config provide
 	// When running for long period of time.
 	p.logFollow.Do(func() {
 		go func() {
-			t, err := tail.TailFile(".metadata/.log", tail.Config{
+			// Determine the log file path relative to workspace
+			logFilePath := filepath.Join(workspace, ".metadata", ".log")
+
+			t, err := tail.TailFile(logFilePath, tail.Config{
 				ReOpen:    true,
 				MustExist: false,
 				Follow:    true,
@@ -576,8 +581,17 @@ func (p *javaProvider) Init(ctx context.Context, log logr.Logger, config provide
 				return
 			}
 
+			// If logLevel > 6, follow all JDTLS logs
+			// Otherwise, only follow KONVEYOR_LOG tagged lines
+			followAll := p.logLevel > 6
+			if followAll {
+				log.Info("following full JDTLS log", "path", logFilePath, "logLevel", p.logLevel)
+			}
+
 			for line := range t.Lines {
-				if strings.Contains(line.Text, "KONVEYOR_LOG") {
+				if followAll {
+					log.Info("language server log", "line", line.Text)
+				} else if strings.Contains(line.Text, "KONVEYOR_LOG") {
 					log.Info("language server log", "line", line.Text)
 				}
 			}