diag: thread-safety step1 - json marshal under mutex

diagnostics/bodies_info.go

@@ -17,7 +17,6 @@
 package diagnostics
 
 import (
-	"encoding/json"
 	"net/http"
 
 	diaglib "github.com/ledgerwatch/erigon-lib/diagnostics"
@@ -37,5 +36,5 @@ func SetupBodiesAccess(metricsMux *http.ServeMux, diag *diaglib.DiagnosticClient
 }
 
 func writeBodies(w http.ResponseWriter, diag *diaglib.DiagnosticClient) {
-	json.NewEncoder(w).Encode(diag.GetBodiesInfo())
+	diag.BodiesInfoJson(w)
 }

diagnostics/headers.go

@@ -17,7 +17,6 @@
 package diagnostics
 
 import (
-	"encoding/json"
 	"net/http"
 
 	diaglib "github.com/ledgerwatch/erigon-lib/diagnostics"
@@ -36,5 +35,5 @@ func SetupHeadersAccess(metricsMux *http.ServeMux, diag *diaglib.DiagnosticClien
 }
 
 func writeHeaders(w http.ResponseWriter, diag *diaglib.DiagnosticClient) {
-	json.NewEncoder(w).Encode(diag.GetHeaders())
+	diag.HeadersJson(w)
 }

diagnostics/snapshot_sync.go

@@ -17,7 +17,6 @@
 package diagnostics
 
 import (
-	"encoding/json"
 	"net/http"
 
 	diaglib "github.com/ledgerwatch/erigon-lib/diagnostics"
@@ -66,25 +65,25 @@ func SetupStagesAccess(metricsMux *http.ServeMux, diag *diaglib.DiagnosticClient
 }
 
 func writeNetworkSpeed(w http.ResponseWriter, diag *diaglib.DiagnosticClient) {
-	json.NewEncoder(w).Encode(diag.GetNetworkSpeed())
+	diag.NetworkSpeedJson(w)
 }
 
 func writeResourcesUsage(w http.ResponseWriter, diag *diaglib.DiagnosticClient) {
-	json.NewEncoder(w).Encode(diag.GetResourcesUsage())
+	diag.ResourcesUsageJson(w)
 }
 
 func writeStages(w http.ResponseWriter, diag *diaglib.DiagnosticClient) {
-	json.NewEncoder(w).Encode(diag.SyncStatistics())
+	diag.SyncStatsJson(w)
 }
 
 func writeFilesList(w http.ResponseWriter, diag *diaglib.DiagnosticClient) {
-	json.NewEncoder(w).Encode(diag.SnapshotFilesList())
+	diag.SnapshotFilesListJson(w)
 }
 
 func writeHardwareInfo(w http.ResponseWriter, diag *diaglib.DiagnosticClient) {
-	json.NewEncoder(w).Encode(diag.HardwareInfo())
+	diag.HardwareInfoJson(w)
 }
 
 func writeSyncStages(w http.ResponseWriter, diag *diaglib.DiagnosticClient) {
-	json.NewEncoder(w).Encode(diag.GetSyncStages())
+	diag.SyncStagesJson(w)
 }

erigon-lib/diagnostics/bodies.go

@@ -18,6 +18,8 @@ package diagnostics
 
 import (
 	"context"
+	"encoding/json"
+	"io"
 
 	"github.com/ledgerwatch/erigon-lib/log/v3"
 )
@@ -109,8 +111,10 @@ func (d *DiagnosticClient) runBodiesProcessingListener(rootCtx context.Context)
 	}()
 }
 
-func (d *DiagnosticClient) GetBodiesInfo() BodiesInfo {
+func (d *DiagnosticClient) BodiesInfoJson(w io.Writer) {
 	d.bodiesMutex.Lock()
 	defer d.bodiesMutex.Unlock()
-	return d.bodies
+	if err := json.NewEncoder(w).Encode(d.bodies); err != nil {
+		log.Debug("[diagnostics] BodiesInfoJson", "err", err)
+	}
 }

erigon-lib/diagnostics/headers.go

@@ -18,6 +18,8 @@ package diagnostics
 
 import (
 	"context"
+	"encoding/json"
+	"io"
 
 	"github.com/ledgerwatch/erigon-lib/log/v3"
 )
@@ -29,8 +31,12 @@ func (d *DiagnosticClient) setupHeadersDiagnostics(rootCtx context.Context) {
 	d.runProcessedListener(rootCtx)
 }
 
-func (d *DiagnosticClient) GetHeaders() Headers {
-	return d.headers
+func (d *DiagnosticClient) HeadersJson(w io.Writer) {
+	d.headerMutex.Lock()
+	defer d.headerMutex.Unlock()
+	if err := json.NewEncoder(w).Encode(d.headers); err != nil {
+		log.Debug("[diagnostics] HeadersJson", "err", err)
+	}
 }
 
 func (d *DiagnosticClient) runHeadersWaitingListener(rootCtx context.Context) {

erigon-lib/diagnostics/resources_usage.go

@@ -18,6 +18,8 @@ package diagnostics
 
 import (
 	"context"
+	"encoding/json"
+	"io"
 
 	"github.com/ledgerwatch/erigon-lib/log/v3"
 )
@@ -26,13 +28,16 @@ func (d *DiagnosticClient) setupResourcesUsageDiagnostics(rootCtx context.Contex
 	d.runMemoryStatsListener(rootCtx)
 }
 
-func (d *DiagnosticClient) GetResourcesUsage() ResourcesUsage {
+func (d *DiagnosticClient) ResourcesUsageJson(w io.Writer) {
 	d.resourcesUsageMutex.Lock()
 	defer d.resourcesUsageMutex.Unlock()
 
 	returnObj := d.resourcesUsage
 	d.resourcesUsage = ResourcesUsage{}
-	return returnObj
+
+	if err := json.NewEncoder(w).Encode(returnObj); err != nil {
+		log.Debug("[diagnostics] ResourcesUsageJson", "err", err)
+	}
 }
 
 func (d *DiagnosticClient) runMemoryStatsListener(rootCtx context.Context) {

erigon-lib/diagnostics/snapshots.go

@@ -18,7 +18,9 @@ package diagnostics
 
 import (
 	"context"
+	"encoding/json"
 	"fmt"
+	"io"
 	"time"
 
 	"github.com/ledgerwatch/erigon-lib/common"
@@ -424,12 +426,25 @@ func (d *DiagnosticClient) SetFillDBInfo(info SnapshotFillDBStage) {
 	}
 }
 
+// Deprecated - it's not thread-safe and used only in tests. Need introduce another method or add special methods for Tests.
 func (d *DiagnosticClient) SyncStatistics() SyncStatistics {
 	return d.syncStats
 }
 
-func (d *DiagnosticClient) SnapshotFilesList() SnapshoFilesList {
-	return d.snapshotFileList
+func (d *DiagnosticClient) SyncStatsJson(w io.Writer) {
+	d.mu.Lock()
+	defer d.mu.Unlock()
+	if err := json.NewEncoder(w).Encode(d.syncStats); err != nil {
+		log.Debug("[diagnostics] SyncStatsJson", "err", err)
+	}
+}
+
+func (d *DiagnosticClient) SnapshotFilesListJson(w io.Writer) {
+	d.mu.Lock()
+	defer d.mu.Unlock()
+	if err := json.NewEncoder(w).Encode(d.snapshotFileList); err != nil {
+		log.Debug("[diagnostics] SnapshotFilesListJson", "err", err)
+	}
 }
 
 func SnapshotDownloadInfoFromTx(tx kv.Tx) ([]byte, error) {

erigon-lib/diagnostics/speedtest.go

@@ -18,8 +18,11 @@ package diagnostics
 
 import (
 	"context"
+	"encoding/json"
+	"io"
 	"time"
 
+	"github.com/ledgerwatch/erigon-lib/log/v3"
 	"github.com/showwin/speedtest-go/speedtest"
 	"github.com/showwin/speedtest-go/speedtest/transport"
 )
@@ -86,6 +89,10 @@ func (d *DiagnosticClient) runSpeedTest(rootCtx context.Context) NetworkSpeedTes
 	}
 }
 
-func (d *DiagnosticClient) GetNetworkSpeed() NetworkSpeedTestResult {
-	return d.networkSpeed
+func (d *DiagnosticClient) NetworkSpeedJson(w io.Writer) {
+	d.networkSpeedMutex.Lock()
+	defer d.networkSpeedMutex.Unlock()
+	if err := json.NewEncoder(w).Encode(d.networkSpeed); err != nil {
+		log.Debug("[diagnostics] ResourcesUsageJson", "err", err)
+	}
 }

erigon-lib/diagnostics/stages.go

@@ -18,7 +18,9 @@ package diagnostics
 
 import (
 	"context"
+	"encoding/json"
 	"fmt"
+	"io"
 
 	"github.com/ledgerwatch/erigon-lib/common"
 	"github.com/ledgerwatch/erigon-lib/kv"
@@ -283,7 +285,12 @@ func (d *DiagnosticClient) SetCurrentSyncSubStage(css CurrentSyncSubStage) {
 	}
 }
 
+// Deprecated - used only in tests. Non-thread-safe.
 func (d *DiagnosticClient) GetStageState(stageId string) (StageState, error) {
+	return d.getStageState(stageId)
+}
+
+func (d *DiagnosticClient) getStageState(stageId string) (StageState, error) {
 	for _, stage := range d.syncStages {
 		if stage.ID == stageId {
 			return stage.State, nil
@@ -311,6 +318,15 @@ func StagesListUpdater(info []SyncStage) func(tx kv.RwTx) error {
 	return PutDataToTable(kv.DiagSyncStages, StagesListKey, info)
 }
 
+// Deprecated - not thread-safe method. Used only in tests. Need introduce more thread-safe method or something special for tests.
 func (d *DiagnosticClient) GetSyncStages() []SyncStage {
 	return d.syncStages
 }
+
+func (d *DiagnosticClient) SyncStagesJson(w io.Writer) {
+	d.mu.Lock()
+	defer d.mu.Unlock()
+	if err := json.NewEncoder(w).Encode(d.syncStages); err != nil {
+		log.Debug("[diagnostics] HardwareInfoJson", "err", err)
+	}
+}

erigon-lib/diagnostics/sys_info.go

@@ -17,6 +17,9 @@
 package diagnostics
 
 import (
+	"encoding/json"
+	"io"
+
 	"github.com/shirou/gopsutil/v3/cpu"
 	"github.com/shirou/gopsutil/v3/disk"
 	"github.com/shirou/gopsutil/v3/mem"
@@ -59,8 +62,12 @@ func (d *DiagnosticClient) setupSysInfoDiagnostics() {
 	d.mu.Unlock()
 }
 
-func (d *DiagnosticClient) HardwareInfo() HardwareInfo {
-	return d.hardwareInfo
+func (d *DiagnosticClient) HardwareInfoJson(w io.Writer) {
+	d.mu.Lock()
+	defer d.mu.Unlock()
+	if err := json.NewEncoder(w).Encode(d.hardwareInfo); err != nil {
+		log.Debug("[diagnostics] HardwareInfoJson", "err", err)
+	}
 }
 
 func findNodeDisk(dirPath string) string {