src/client/api.ts

@@ -41,8 +41,9 @@ export const load = (id: string) =>
             return res;
         });
 
-export const save = (id: string, v: journey) =>
-    fetch("/api/" + id, { method: "post", body: JSON.stringify(v) })
+export const save = (id: string, v: journey) =>{
+    v.version = v.version +1 
+    return fetch("/api/" + id, { method: "post", body: JSON.stringify(v) })
         .then((res) => {
             if (!res.ok) throw new Error("Error " + res.statusText);
             return res.json();
@@ -50,6 +51,7 @@ export const save = (id: string, v: journey) =>
         .then((_res) => {
             console.log("Saved...");
         });
+    }
 
 export const query_nominatim = (
     q: string,

src/client/types/format.ts

@@ -37,6 +37,7 @@ declare global {
 
     interface journey {
         fmt_ver: number
+        version: number
         title: string
         main: leg[]
     }

src/client/types/migration.ts

@@ -10,6 +10,7 @@ function migrate_A_to_0(e: journey): journey {
         v.travel = v.travel || [];
         v.day_title = typeof (v.day_title) == "string" ? [v.day_title] : [];
     })
+    e.version = e.version | 0;
     console.log(e)
     return e;
 }

src/server/api.ts

@@ -72,18 +72,18 @@ export default function (server, opts, done) {
   });
 
   server.post("/:id", async (req, reply) => {
-    if (req.params.id == undefined)
+    if (req.params.id == undefined )
       return reply.code(400).send({ error: "No ID query parameter" });
 
-    server.level.db.put(req.params.id, req.body, (err) => {
-      if (err) {
-        console.warn(err);
-        reply.code(500).send({ error: "Error with DB" });
-      } else {
-        reply.send({ content: "ok" });
+    return server.level.db.get(req.params.id).then(r=>r.version>=0?r.version:-1).catch(_=>-1).then(db_ver=>{
+      if(db_ver+1 == req.body.version){
+        return server.level.db.put(req.params.id, req.body)
+        .then(_=>reply.send({ content: "ok" }))
+        .catch(_err=>reply.code(500).send({ error: "Error with DB" }));
+      }else{
+        return reply.code(409).send({ error: "Old version, please refresh" });
       }
-    });
-    return reply;
+    })
   });
 
   done();