From bdeb51a940cf428ec5f29be500cb20ec0e9d7e7b Mon Sep 17 00:00:00 2001
From: Seth Trowbridge <seth111@gmail.com>
Date: Sat, 22 Apr 2023 06:22:53 -0400
Subject: [PATCH] control client seeding

---
 lib/iso.tsx | 17 +++++++++--------
 server.tsx  |  4 +++-
 2 files changed, 12 insertions(+), 9 deletions(-)

diff --git a/lib/iso.tsx b/lib/iso.tsx
index ab1fb2e..071cbd7 100644
--- a/lib/iso.tsx
+++ b/lib/iso.tsx
@@ -160,11 +160,12 @@ export const Switch =({children}:{children:Children})=>
 export const Case =({children, value}:{children:Children, value?:string, default?:true})=>null;
 export const useRouteVars =()=> React.useContext(SwitchContext).keys;
 
-export type FetchRecord = {URL:string, CacheFor:number, CachedAt:number, CacheOnServer:boolean, Promise?:Promise<FetchRecord>, DelaySSR:boolean, Error?:string, JSON?:object};
+export type FetchRecord = {URL:string, CacheFor:number, CachedAt:number, CacheOnServer:boolean, Promise?:Promise<FetchRecord>, DelaySSR:boolean, Seed:boolean, Error?:string, JSON?:object};
 export const Fetch = {
     Cache:new Map() as Map<string, FetchRecord>,
     ServerBlocking:false as false|Promise<FetchRecord>[],
     ServerTouched:false as false|Set<FetchRecord>,
+    ServerRemove:false as false|Set<FetchRecord>,
     Seed(seed:FetchRecord[])
     {
         seed.forEach(r=>{
@@ -172,7 +173,7 @@ export const Fetch = {
             Fetch.Cache.set(r.URL, r)
         });
     },
-    Request(URL:string, Init?:RequestInit, CacheFor:number = 60, CacheOnServer:boolean = true, DelaySSR:boolean = true)
+    Request(URL:string, Init?:RequestInit, CacheFor:number = 60, CacheOnServer:boolean = true, DelaySSR:boolean = true, Seed:boolean = true)
     {
         let check = Fetch.Cache.get(URL);
         
@@ -192,7 +193,7 @@ export const Fetch = {
         if(!check)
         {
             console.log(`making new cache record...`);
-            return load({URL, CacheFor, CachedAt:0, CacheOnServer, DelaySSR});
+            return load({URL, CacheFor, CachedAt:0, CacheOnServer, DelaySSR, Seed});
         }
         else if(check.CachedAt == 0)
         {
@@ -216,18 +217,18 @@ export const Fetch = {
 
         }
     },
-    Use(URL:string, Init?:RequestInit, CacheFor:number = 60, CacheOnServer:boolean = true, DelaySSR:boolean = true)
+    Use(URL:string, Init?:RequestInit, CacheFor:number = 60, CacheOnServer:boolean = true, DelaySSR:boolean = true, Seed:boolean = true)
     {
         type FetchHookState = [Data:undefined|object, Updating:boolean];
         const [cacheGet, cacheSet] = React.useState([undefined, true] as FetchHookState);
-        if(Fetch.ServerBlocking && DelaySSR)
+        if(Fetch.ServerBlocking && Fetch.ServerTouched && DelaySSR)
         {
-            const receipt = Fetch.Request(URL, Init, CacheFor, CacheOnServer, DelaySSR);
-            if(receipt.CachedAt === 0 && receipt.Promise)
+            const receipt = Fetch.Request(URL, Init, CacheFor, CacheOnServer, DelaySSR, Seed);
+            if(receipt.CachedAt === 0 && receipt.Promise)// request for something that hasnt been cached yet
             {
                 Fetch.ServerBlocking.push(receipt.Promise);
             }
-            else
+            else if(receipt.Seed)
             {
                 Fetch.ServerTouched.add(receipt);
             }
diff --git a/server.tsx b/server.tsx
index a6efd9a..2aae3d6 100644
--- a/server.tsx
+++ b/server.tsx
@@ -223,17 +223,19 @@ FileListen("${url.pathname}", reloadHandler);`;
         {
             Iso.Fetch.ServerBlocking = [];
             Iso.Fetch.ServerTouched = new Set();
+            Iso.Fetch.ServerRemove = new Set();
             let bake = SSR(<Iso.Router.Provider url={url}><App/></Iso.Router.Provider>);
             while(Iso.Fetch.ServerBlocking.length)
             {
                 await Promise.all(Iso.Fetch.ServerBlocking);
                 Iso.Fetch.ServerBlocking = [];
+                // at this point, anything that was requested that was not cached, has now been loaded and cached
+                // this next render will use cached resources. using a cached resource (if its "Seed" is true) adds it to the "touched" set.
                 bake = SSR(<Iso.Router.Provider url={url}><App/></Iso.Router.Provider>);
             }
 
             const seed:Iso.FetchRecord[] = [];
             Iso.Fetch.ServerTouched.forEach((record)=>{
-
                 const r:Iso.FetchRecord = {...record};
                 delete r.Promise;
                 seed.push(r);