From a877cd49d7dbf802862597f4bf2203d58efc2055 Mon Sep 17 00:00:00 2001
From: chin <a5566qq2581@gmail.com>
Date: Sun, 30 Apr 2023 17:18:37 +0800
Subject: [PATCH] feat(wado-uri): #5

---
 api/WADO-URI/service/WADO-URI.service.js | 32 ++++++++++++++++++++++--
 error/dicom-instance.js                  | 11 ++++++++
 2 files changed, 41 insertions(+), 2 deletions(-)

diff --git a/api/WADO-URI/service/WADO-URI.service.js b/api/WADO-URI/service/WADO-URI.service.js
index c6756de0..a187caf2 100644
--- a/api/WADO-URI/service/WADO-URI.service.js
+++ b/api/WADO-URI/service/WADO-URI.service.js
@@ -6,7 +6,7 @@ const { Dcm2JpgExecutor } = require("../../../models/DICOM/dcm4che/wrapper/org/g
 const { Dcm2JpgExecutor$Dcm2JpgOptions } = require("../../../models/DICOM/dcm4che/wrapper/org/github/chinlinlee/dcm2jpg/Dcm2JpgExecutor$Dcm2JpgOptions");
 const sharp = require('sharp');
 const Magick = require("../../../models/magick");
-const { NotFoundInstanceError, InvalidFrameNumberError } = require("../../../error/dicom-instance");
+const { NotFoundInstanceError, InvalidFrameNumberError, InstanceGoneError } = require("../../../error/dicom-instance");
 const dicomModel = require("../../../models/mongodb/models/dicom");
 
 class WadoUriService {
@@ -36,6 +36,16 @@ class WadoUriService {
                     "Content-Type": "application/dicom+json"
                 });
                 return this.response.end();
+            } else if (e instanceof InstanceGoneError) {
+                this.response.writeHead(410, {
+                    "Content-Type": "application/dicom+json"
+                });
+                return this.response.end(JSON.stringify({
+                    Details: e.message,
+                    HttpStatus: 410,
+                    Message: "Image Gone",
+                    Method: "GET"
+                }));
             }
 
             throw e;
@@ -73,6 +83,16 @@ class WadoUriService {
                     Method: "GET"
                 }));
 
+            } else if (e instanceof InstanceGoneError) {
+                this.response.writeHead(410, {
+                    "Content-Type": "application/dicom+json"
+                });
+                return this.response.end(JSON.stringify({
+                    Details: e.message,
+                    HttpStatus: 410,
+                    Message: "Image Gone",
+                    Method: "GET"
+                }));
             }
 
             throw e;
@@ -85,7 +105,7 @@ class WadoUriService {
      * @returns {Promise<fs.ReadStream>}
      */
     async getDicomInstanceReadStream() {
-
+        
         let imagePathObj = await this.getDicomInstancePathObj();
 
         return fs.createReadStream(imagePathObj.instancePath);
@@ -105,6 +125,14 @@ class WadoUriService {
         });
 
         if (imagePathObj) {
+
+            try {
+                await fs.promises.access(imagePathObj.instancePath, fs.constants.F_OK);
+            } catch(e) {
+                console.error(e);
+                throw new InstanceGoneError("The image is deleted permanently, but meta data remain");
+            }
+
             return imagePathObj;
         }
 
diff --git a/error/dicom-instance.js b/error/dicom-instance.js
index 4c317438..a60d1378 100644
--- a/error/dicom-instance.js
+++ b/error/dicom-instance.js
@@ -7,6 +7,15 @@ class NotFoundInstanceError extends Error {
     }
 }
 
+class InstanceGoneError extends Error {
+    constructor(message) {
+        super(message);
+        Error.captureStackTrace(this, this.constructor);
+
+        this.name = this.constructor.name;
+    }
+}
+
 class InvalidFrameNumberError extends Error {
     constructor(message) {
         super(message);
@@ -17,4 +26,6 @@ class InvalidFrameNumberError extends Error {
 }
 
 module.exports.NotFoundInstanceError = NotFoundInstanceError;
+module.exports.InstanceGoneError = InstanceGoneError;
 module.exports.InvalidFrameNumberError = InvalidFrameNumberError;
+