adding error handling for all DB calls. Returning StatusInternalServerError whenever an error occurs. Adding additional logging to server handlers.

Make sure we "return" after a c.JSON call.

webapp/backend/pkg/web/handler/get_device_details.go

@@ -5,25 +5,40 @@ import (
 	dbModels "github.com/analogj/scrutiny/webapp/backend/pkg/models/db"
 	"github.com/gin-gonic/gin"
 	"github.com/jinzhu/gorm"
+	"github.com/sirupsen/logrus"
 	"net/http"
 )
 
 func GetDeviceDetails(c *gin.Context) {
 	db := c.MustGet("DB").(*gorm.DB)
+	logger := c.MustGet("LOGGER").(logrus.FieldLogger)
 	device := dbModels.Device{}
 
-	db.Debug().
-		Preload("SmartResults", func(db *gorm.DB) *gorm.DB {
+	if err := db.Preload("SmartResults", func(db *gorm.DB) *gorm.DB {
 		return db.Order("smarts.created_at DESC").Limit(40)
 	}).
 		Preload("SmartResults.AtaAttributes").
 		Preload("SmartResults.NvmeAttributes").
 		Preload("SmartResults.ScsiAttributes").
 		Where("wwn = ?", c.Param("wwn")).
-		First(&device)
+		First(&device).Error; err != nil {
 
-	device.SquashHistory()
-	device.ApplyMetadataRules()
+		logger.Errorln("An error occurred while retrieving device details", err)
+		c.JSON(http.StatusInternalServerError, gin.H{"success": false})
+		return
+	}
+
+	if err := device.SquashHistory(); err != nil {
+		logger.Errorln("An error occurred while squashing device history", err)
+		c.JSON(http.StatusInternalServerError, gin.H{"success": false})
+		return
+	}
+
+	if err := device.ApplyMetadataRules(); err != nil {
+		logger.Errorln("An error occurred while applying scrutiny thresholds & rules", err)
+		c.JSON(http.StatusInternalServerError, gin.H{"success": false})
+		return
+	}
 
 	var deviceMetadata interface{}
 	if device.IsAta() {

webapp/backend/pkg/web/handler/get_devices_summary.go

@@ -4,20 +4,25 @@ import (
 	dbModels "github.com/analogj/scrutiny/webapp/backend/pkg/models/db"
 	"github.com/gin-gonic/gin"
 	"github.com/jinzhu/gorm"
+	"github.com/sirupsen/logrus"
 	"net/http"
 )
 
 func GetDevicesSummary(c *gin.Context) {
 	db := c.MustGet("DB").(*gorm.DB)
+	logger := c.MustGet("LOGGER").(logrus.FieldLogger)
 	devices := []dbModels.Device{}
 
 	//We need the last x (for now all) Smart objects for each Device, so that we can graph Temperature
 	//We also need the last
-	db.Debug().
-		Preload("SmartResults", func(db *gorm.DB) *gorm.DB {
+	if err := db.Preload("SmartResults", func(db *gorm.DB) *gorm.DB {
 		return db.Order("smarts.created_at DESC") //OLD: .Limit(devicesCount)
 	}).
-		Find(&devices)
+		Find(&devices).Error; err != nil {
+		logger.Errorln("Could not get device summary from DB", err)
+		c.JSON(http.StatusInternalServerError, gin.H{"success": false})
+		return
+	}
 
 	c.JSON(http.StatusOK, gin.H{
 		"success": true,

webapp/backend/pkg/web/handler/register_devices.go

@@ -4,36 +4,43 @@ import (
 	dbModels "github.com/analogj/scrutiny/webapp/backend/pkg/models/db"
 	"github.com/gin-gonic/gin"
 	"github.com/jinzhu/gorm"
-	log "github.com/sirupsen/logrus"
+	"github.com/sirupsen/logrus"
 	"net/http"
 )
 
 // filter devices that are detected by various collectors.
 func RegisterDevices(c *gin.Context) {
 	db := c.MustGet("DB").(*gorm.DB)
+	logger := c.MustGet("LOGGER").(logrus.FieldLogger)
 
 	var collectorDeviceWrapper dbModels.DeviceWrapper
 	err := c.BindJSON(&collectorDeviceWrapper)
 	if err != nil {
-		log.Error("Cannot parse detected devices")
-		c.JSON(http.StatusOK, gin.H{"success": false})
+		logger.Errorln("Cannot parse detected devices", err)
+		c.JSON(http.StatusInternalServerError, gin.H{"success": false})
+		return
 	}
 
 	//TODO: filter devices here (remove excludes, force includes)
-
+	errs := []error{}
 	for _, dev := range collectorDeviceWrapper.Data {
 		//insert devices into DB if not already there.
-		db.Where(dbModels.Device{WWN: dev.WWN}).FirstOrCreate(&dev)
+		if err := db.Where(dbModels.Device{WWN: dev.WWN}).FirstOrCreate(&dev).Error; err != nil {
+			errs = append(errs, err)
+		}
 	}
 
-	if err != nil {
-		c.JSON(http.StatusOK, gin.H{
+	if len(errs) > 0 {
+		logger.Errorln("An error occurred while registering devices", errs)
+		c.JSON(http.StatusInternalServerError, gin.H{
 			"success": false,
 		})
+		return
 	} else {
 		c.JSON(http.StatusOK, dbModels.DeviceWrapper{
 			Success: true,
 			Data:    collectorDeviceWrapper.Data,
 		})
+		return
 	}
 }

webapp/backend/pkg/web/handler/send_test_notification.go

@@ -6,6 +6,7 @@ import (
 	dbModels "github.com/analogj/scrutiny/webapp/backend/pkg/models/db"
 	"github.com/analogj/scrutiny/webapp/backend/pkg/notify"
 	"github.com/gin-gonic/gin"
+	"github.com/sirupsen/logrus"
 	"net/http"
 	"os"
 )
@@ -13,6 +14,7 @@ import (
 // Send test notification
 func SendTestNotification(c *gin.Context) {
 	appConfig := c.MustGet("CONFIG").(config.Interface)
+	logger := c.MustGet("LOGGER").(logrus.FieldLogger)
 
 	testNotify := notify.Notify{
 		Config: appConfig,
@@ -28,7 +30,8 @@ func SendTestNotification(c *gin.Context) {
 	}
 	err := testNotify.Send()
 	if err != nil {
-		c.JSON(http.StatusOK, gin.H{
+		logger.Errorln("An error occurred while sending test notification", err)
+		c.JSON(http.StatusInternalServerError, gin.H{
 			"success": false,
 		})
 	} else {

webapp/backend/pkg/web/handler/upload_device_metrics.go

@@ -5,36 +5,45 @@ import (
 	dbModels "github.com/analogj/scrutiny/webapp/backend/pkg/models/db"
 	"github.com/gin-gonic/gin"
 	"github.com/jinzhu/gorm"
-	log "github.com/sirupsen/logrus"
+	"github.com/sirupsen/logrus"
 	"net/http"
 )
 
 func UploadDeviceMetrics(c *gin.Context) {
 	db := c.MustGet("DB").(*gorm.DB)
+	logger := c.MustGet("LOGGER").(logrus.FieldLogger)
 
 	var collectorSmartData collector.SmartInfo
 	err := c.BindJSON(&collectorSmartData)
 	if err != nil {
-		//TODO: cannot parse smart data
-		log.Error("Cannot parse SMART data")
-		c.JSON(http.StatusOK, gin.H{"success": false})
-
+		logger.Errorln("Cannot parse SMART data", err)
+		c.JSON(http.StatusInternalServerError, gin.H{"success": false})
+		return
 	}
 
 	//update the device information if necessary
 	var device dbModels.Device
 	db.Where("wwn = ?", c.Param("wwn")).First(&device)
 	device.UpdateFromCollectorSmartInfo(collectorSmartData)
-	db.Model(&device).Updates(device)
+	if err := db.Model(&device).Updates(device).Error; err != nil {
+		logger.Errorln("An error occurred while updating device data from smartctl metrics", err)
+		c.JSON(http.StatusInternalServerError, gin.H{"success": false})
+		return
+	}
 
 	// insert smart info
 	deviceSmartData := dbModels.Smart{}
 	err = deviceSmartData.FromCollectorSmartInfo(c.Param("wwn"), collectorSmartData)
 	if err != nil {
-		c.JSON(http.StatusOK, gin.H{"success": false})
+		logger.Errorln("Could not process SMART metrics", err)
+		c.JSON(http.StatusInternalServerError, gin.H{"success": false})
+		return
+	}
+	if err := db.Create(&deviceSmartData).Error; err != nil {
+		logger.Errorln("An error occurred while saving smartctl metrics", err)
+		c.JSON(http.StatusInternalServerError, gin.H{"success": false})
 		return
 	}
-	db.Create(&deviceSmartData)
 
 	c.JSON(http.StatusOK, gin.H{"success": true})
 }

webapp/backend/pkg/web/middleware/logger.go

@@ -51,6 +51,7 @@ func LoggerMiddleware(logger logrus.FieldLogger) gin.HandlerFunc {
 		path := c.Request.URL.Path
 		blw := &responseBodyLogWriter{body: &bytes.Buffer{}, ResponseWriter: c.Writer}
 		c.Writer = blw
+		c.Set("LOGGER", logger)
 		start := time.Now()
 		c.Next()
 		stop := time.Since(start)