reception: prevent concurrent access to same order

reception/static/css/reception_style.css

@@ -35,6 +35,15 @@ input[type="number"] {
   margin-bottom: 1em;
 }
 
+.order_last_update {
+  font-weight: bold;
+}
+
+.order_modified_msg {
+  font-size: 2rem;
+  color: #e62720;
+}
+
 /* PRODUITS */
 .page_body {
   height: 100%;

reception/static/js/reception_index.js

@@ -11,12 +11,38 @@ var orders = [],
         groups: []
     },
     dbc = null,
-    sync = null;
+    sync = null,
+    fingerprint = null;
 
 
 /* UTILS */
 
 /**
+ * Difference between two dates
+ * @param {Date} date1 
+ * @param {Date} date2 
+ * @returns difference object
+ */
+ function dates_diff(date1, date2) {
+    var diff = {}
+    var tmp = date2 - date1;
+ 
+    tmp = Math.floor(tmp/1000);
+    diff.sec = tmp % 60;
+ 
+    tmp = Math.floor((tmp-diff.sec)/60);
+    diff.min = tmp % 60;
+ 
+    tmp = Math.floor((tmp-diff.min)/60);
+    diff.hours = tmp % 24;
+     
+    tmp = Math.floor((tmp-diff.hours)/24);
+    diff.days = tmp;
+     
+    return diff;
+}
+
+/**
  * Wait for both ajax callbacks for reloading to avoid a js error
  *   -> reloading when ajax call not answered causes a popup to appear, which can be confusing
  */
@@ -25,6 +51,48 @@ function reload() {
         document.location.reload();
 }
 
+/**
+ * Check for concurent access to same order before going to reception page.
+ * @param {Int} id 
+ */
+function check_before_goto(id) {
+    const order_doc_id = 'order_' + id;
+    dbc.get(order_doc_id).then((doc) => {
+        console.log(doc);
+        if (doc.last_update.fingerprint !== null && doc.last_update.fingerprint !== fingerprint) {
+            time_diff = dates_diff(new Date(doc.last_update.timestamp), new Date())
+            diff_str = ``
+
+            if (time_diff.days !== 0) {
+                diff_str += `${time_diff.days} jour(s), `
+            }
+            if (time_diff.hours !== 0) {
+                diff_str += `${time_diff.hours} heure(s), `
+            }
+            if (time_diff.min !== 0) {
+                diff_str += `${time_diff.min} min, `
+            }
+            diff_str += `${time_diff.sec}s`
+
+            let modal_order_access = $('#templates #modal_order_access');
+            modal_order_access.find(".order_last_update").text(diff_str);
+
+            openModal(
+                modal_order_access.html(),
+                () => {
+                    goto(id);
+                },
+                'Valider'
+            );
+        } else {
+            goto(id);
+        }
+    })
+    .catch((err) => {
+        console.log(err);
+    })
+}
+
 function goto(id) {
     document.location.href = "produits/" + id;
 }
@@ -49,7 +117,7 @@ function group_goto(group_index) {
     }
 
     // go to first order
-    goto(order_groups.groups[group_index][0]);
+    check_before_goto(order_groups.groups[group_index][0]);
 }
 
 /**
@@ -62,7 +130,7 @@ function create_order_doc(order_data, go_to_order = false) {
 
     dbc.get(order_doc_id).then(() => {
         if (go_to_order === true) {
-            goto(order_data.id);
+            check_before_goto(order_data.id);
         }
     })
         .catch(function (err) {
@@ -71,21 +139,23 @@ function create_order_doc(order_data, go_to_order = false) {
                 let order_doc = { ...order_data };
 
                 order_doc._id = order_doc_id;
-
-                dbc.put(order_doc, (err) => {
-                    if (!err) {
-                        if (go_to_order === true) {
-                            goto(order_data.id);
-                        }
-                    } else {
-                        error = {
-                            msg: 'Erreur dans la creation de la commande dans couchdb',
-                            ctx: 'validatePrices',
-                            details: err
-                        };
-                        report_JS_error(error, 'reception');
-                        console.log(error);
+                order_doc.last_update = {
+                    timestamp: Date.now(),
+                    fingerprint: fingerprint,
+                };
+
+                dbc.put(order_doc).then(() => {
+                    if (go_to_order === true) {
+                        goto(order_data.id);
                     }
+                }).catch((err) => {
+                    error = {
+                        msg: 'Erreur dans la creation de la commande dans couchdb',
+                        ctx: 'validatePrices',
+                        details: err
+                    };
+                    report_JS_error(error, 'reception');
+                    console.log(error);
                 });
             }
         });
@@ -184,6 +254,8 @@ function group_action() {
 
             // Create doc for each group order if doesn't exist
             create_order_doc(selected_data[i]);
+
+            // TODO (en dernier): ask before grouping if at least one of the orders is being updated somewhere else
         }
 
         group_ids.sort();
@@ -442,6 +514,8 @@ $(document).ready(function() {
     openModal();
     $.ajaxSetup({ headers: { "X-CSRFToken": getCookie('csrftoken') } });
 
+    fingerprint = new Fingerprint({canvas: true}).get();
+    
     // Init couchdb
     dbc = new PouchDB(couchdb_dbname),
     sync = PouchDB.sync(couchdb_dbname, couchdb_server, {
@@ -493,8 +567,6 @@ $(document).ready(function() {
         console.log(err);
     });
 
-    // TODO on button click to access order: verif fingerprint & timestamp
-
     // Get or create order groups doc
     dbc.get("grouped_orders").then((doc) => {
         order_groups = doc;

reception/static/js/reception_produits.js

@@ -33,7 +33,8 @@ var reception_status = null,
     barcodes = null; // Barcodes stored locally
 
 var dbc = null,
-    sync = null;
+    sync = null,
+    fingerprint = null;
 
 /* UTILS */
 
@@ -115,7 +116,10 @@ function select_product_from_bc(barcode) {
  * @param {int} order_id
  */
 function update_distant_order(order_id) {
-    // TODO insert fingerprint & timestamp
+    orders[order_id].last_update = {
+        timestamp: Date.now(),
+        fingerprint: fingerprint,
+    };
 
     dbc.put(orders[order_id], (err, result) => {
         if (!err && result !== undefined) {
@@ -127,6 +131,30 @@ function update_distant_order(order_id) {
     });
 }
 
+/**
+ * Update distant orders with local data
+ * @param {int} order_id
+ */
+ function update_distant_orders() {
+    for (let order_id in orders) {
+        orders[order_id].last_update = {
+            timestamp: Date.now(),
+            fingerprint: fingerprint,
+        };
+    }
+
+    dbc.bulkDocs(Object.values(orders)).then((response) => {
+        // Update rev of current orders after their update
+        for (let doc of response) {
+            let order_id = doc.id.split('_')[1];
+            orders[order_id]._rev = doc.rev
+        }
+    })
+    .catch((err) => {
+        console.log(err);
+    })
+}
+
 /* INIT */
 
 // Get order(s) data from server
@@ -1271,6 +1299,12 @@ function send() {
                                 updated_products: orders[order_id].updated_products
                             }
                             orders[order_id].reception_status = updateType;
+
+                            // Unlock order
+                            orders[order_id].last_update = {
+                                timestamp: null,
+                                fingerprint: null,
+                            }
     
                             // Delete temp data
                             delete orders[order_id].valid_products;
@@ -1344,7 +1378,6 @@ function send() {
             }
         });
 
-        // TODO : for step 1, instead of saving a temp report, save data in couchdb ?
         /* Create error report */
         $.ajax({
             type: "POST",
@@ -1445,6 +1478,24 @@ var get_barcodes = async function() {
  * @param {Array} partners_display_data
  */
 function init_dom(partners_display_data) {
+    // Back button
+    $('#back_button').on('click', function () {
+        // Liberate current orders
+        for (let order_id in orders) {
+            orders[order_id].last_update = {
+                timestamp: null,
+                fingerprint: null,
+            };
+        }
+    
+        dbc.bulkDocs(Object.values(orders)).then((response) => {
+            back();
+        })
+        .catch((err) => {
+            console.log(err);
+        })
+    })
+
     // Grouped orders
     if (Object.keys(orders).length > 1) {
         $('#partner_name').html(Object.keys(orders).length + " commandes");
@@ -1504,7 +1555,7 @@ function init_dom(partners_display_data) {
 
         $("#modal_qtiesValidated").load("/reception/reception_qtiesValidated");
     } else {
-        // Extra security, shouldn't get in here
+        // Extra security, shouldn't get in here: reception status not valid
         back();
     }
 
@@ -1620,6 +1671,8 @@ function init_dom(partners_display_data) {
 
 $(document).ready(function() {
     $.ajaxSetup({ headers: { "X-CSRFToken": getCookie('csrftoken') } });
+    
+    fingerprint = new Fingerprint({canvas: true}).get();
 
     // Load barcodes
     get_barcodes();
@@ -1636,15 +1689,25 @@ $(document).ready(function() {
         auto_compaction: false
     });
 
-    // TODO on sync change : redirect (cf order_helper)
-    sync.on('change', function (info) {
-        console.log(info);
+    sync.on('change', function (info) {        
+        if (info.direction === "pull") {
+            for (const doc of info.change.docs) {
+                // Redirect if one of the current order is being modified somewhere else
+                if (String(doc.id) in orders && orders[doc.id]._rev !== doc._rev) {
+                    alert("Un autre navigateur est en train de modifier cette commande ! Vous allez être redirigé.e.");
+                    back();
+                }
+            }
+        }
     }).on('error', function (err) {
+        if (err.status === 409) {
+            alert("Une erreur de synchronisation s'est produite, la commande a sûrement été modifiée sur un autre navigateur. Vous allez être redirigé.e.");
+            back();
+        } 
+        console.log('erreur sync');
         console.log(err);
     });
 
-    // TODO insert fingerprint & timestamp on access to order
-
     // Disable alert errors from datatables
     $.fn.dataTable.ext.errMode = 'none';
 
@@ -1759,6 +1822,9 @@ $(document).ready(function() {
             // Load saved user comments, get it from first order
             user_comments = orders[Object.keys(orders)[0]].user_comments || "";
 
+            // Indicate that these orders are used in this navigator
+            update_distant_orders()
+
             // Fetch orders data
             fetch_data();
 

templates/reception/index.html

@@ -46,6 +46,21 @@
     <p>Êtez-vous sûr ?</p>
     <hr />
   </div>
+
+  <div id="modal_order_access">
+    <h3>Attention !</h3>
+    <br/>
+    <p class="order_modified_msg"> 
+        Un autre navigateur a commencé à réceptionner cette commande il y a <span class="order_last_update"></span>.
+    </p><br/>
+    <p>
+        Si quelqu'un d'autre que vous est à l'origine de cette opération et que celle-ci est récente,
+        nous conseillons fortement de ne pas accéder à la commande afin d'éviter les conflits.
+    </p><br/>
+    <p>Voulez-vous quand même y accéder ?</p>
+    <hr/>
+</div>
+
 </div>
 <br/>
 

templates/reception/reception_produits.html

@@ -19,7 +19,7 @@
 {% endif %}
 <div class="page_body">
   <header class="flex-container">
-    <button class="right btn--danger" onclick="back()">Retour</button>
+    <button class="right btn--danger" id="back_button">Retour</button>
     <div class="w33 arrow-block txtcenter" id="header_step_one">
       <h4 id="header_step_one_content">Produits à compter </h4>
     </div>