feat(api): add /health endpoint

cmd/laas/docs/docs.go

@@ -215,6 +215,36 @@ const docTemplate = `{
                 }
             }
         },
+        "/health": {
+            "get": {
+                "description": "Check health of the service",
+                "consumes": [
+                    "application/json"
+                ],
+                "produces": [
+                    "application/json"
+                ],
+                "tags": [
+                    "Health"
+                ],
+                "summary": "Check health",
+                "operationId": "getHealth",
+                "responses": {
+                    "200": {
+                        "description": "Heath is OK",
+                        "schema": {
+                            "$ref": "#/definitions/models.LicenseError"
+                        }
+                    },
+                    "500": {
+                        "description": "Connection to DB failed",
+                        "schema": {
+                            "$ref": "#/definitions/models.LicenseError"
+                        }
+                    }
+                }
+            }
+        },
         "/licenses": {
             "get": {
                 "description": "Filter licenses based on different parameters",

cmd/laas/docs/swagger.json

@@ -209,6 +209,36 @@
                 }
             }
         },
+        "/health": {
+            "get": {
+                "description": "Check health of the service",
+                "consumes": [
+                    "application/json"
+                ],
+                "produces": [
+                    "application/json"
+                ],
+                "tags": [
+                    "Health"
+                ],
+                "summary": "Check health",
+                "operationId": "getHealth",
+                "responses": {
+                    "200": {
+                        "description": "Heath is OK",
+                        "schema": {
+                            "$ref": "#/definitions/models.LicenseError"
+                        }
+                    },
+                    "500": {
+                        "description": "Connection to DB failed",
+                        "schema": {
+                            "$ref": "#/definitions/models.LicenseError"
+                        }
+                    }
+                }
+            }
+        },
         "/licenses": {
             "get": {
                 "description": "Filter licenses based on different parameters",

cmd/laas/docs/swagger.yaml

@@ -641,6 +641,26 @@ paths:
       summary: Get a changelog
       tags:
       - Audits
+  /health:
+    get:
+      consumes:
+      - application/json
+      description: Check health of the service
+      operationId: getHealth
+      produces:
+      - application/json
+      responses:
+        "200":
+          description: Heath is OK
+          schema:
+            $ref: '#/definitions/models.LicenseError'
+        "500":
+          description: Connection to DB failed
+          schema:
+            $ref: '#/definitions/models.LicenseError'
+      summary: Check health
+      tags:
+      - Health
   /licenses:
     get:
       consumes:

pkg/api/api.go

@@ -15,6 +15,7 @@ import (
 	ginSwagger "github.com/swaggo/gin-swagger"
 
 	"github.com/fossology/LicenseDb/pkg/auth"
+	"github.com/fossology/LicenseDb/pkg/db"
 	"github.com/fossology/LicenseDb/pkg/models"
 )
 
@@ -66,6 +67,10 @@ func Router() *gin.Engine {
 			obMap.GET("topic/:topic", GetObligationMapByTopic)
 			obMap.GET("license/:license", GetObligationMapByLicense)
 		}
+		health := unAuthorizedv1.Group("/health")
+		{
+			health.GET("", GetHealth)
+		}
 	}
 
 	authorizedv1 := r.Group("/api/v1")
@@ -120,3 +125,43 @@ func HandleInvalidUrl(c *gin.Context) {
 	}
 	c.JSON(http.StatusNotFound, er)
 }
+
+// The GetHealth function returns if the DB is running and connected.
+//
+//	@Summary		Check health
+//	@Description	Check health of the service
+//	@Id				getHealth
+//	@Tags			Health
+//	@Accept			json
+//	@Produce		json
+//	@Success		200	{object}	models.LicenseError	"Heath is OK"
+//	@Failure		500	{object}	models.LicenseError	"Connection to DB failed"
+//	@Router			/health [get]
+func GetHealth(c *gin.Context) {
+	// Fetch one license from DB to check if connection is still working.
+	var license models.LicenseDB
+	err := db.DB.Where(&models.LicenseDB{}).First(&license).Error
+	if license.Id == 0 || err != nil {
+		errorMessage := ""
+		if err != nil {
+			errorMessage = err.Error()
+		}
+		er := models.LicenseError{
+			Status:    http.StatusInternalServerError,
+			Message:   "Database is not running or connected",
+			Error:     errorMessage,
+			Path:      c.Request.URL.Path,
+			Timestamp: time.Now().Format(time.RFC3339),
+		}
+		c.JSON(http.StatusInternalServerError, er)
+		return
+	}
+	er := models.LicenseError{
+		Status:    http.StatusOK,
+		Message:   "Database is running and connected",
+		Error:     "",
+		Path:      c.Request.URL.Path,
+		Timestamp: time.Now().Format(time.RFC3339),
+	}
+	c.JSON(http.StatusOK, er)
+}