up2k: shrink request headers

v1.13.5 made some proxies angry with its massive chunklists

when stitching chunks, only list the first chunk hash in full,
and include a truncated hash for the consecutive chunks

should be enough for logfiles to make sense
and to smoketest that clients are behaving

bin/u2c.py

@@ -1,8 +1,8 @@
 #!/usr/bin/env python3
 from __future__ import print_function, unicode_literals
 
-S_VERSION = "1.21"
-S_BUILD_DT = "2024-07-26"
+S_VERSION = "1.22"
+S_BUILD_DT = "2024-08-08"
 
 """
 u2c.py: upload to copyparty
@@ -660,8 +660,15 @@ def upload(fsl, pw, stats):
     # type: (FileSlice, str, str) -> None
     """upload a range of file data, defined by one or more `cid` (chunk-hash)"""
 
+    ctxt = fsl.cids[0]
+    if len(fsl.cids) > 1:
+        n = 192 // len(fsl.cids)
+        n = 9 if n > 9 else 2 if n < 2 else n
+        zsl = [zs[:n] for zs in fsl.cids[1:]]
+        ctxt += ",%d,%s" % (n, "".join(zsl))
+
     headers = {
-        "X-Up2k-Hash": ",".join(fsl.cids),
+        "X-Up2k-Hash": ctxt,
         "X-Up2k-Wark": fsl.file.wark,
         "Content-Type": "application/octet-stream",
     }

copyparty/httpcli.py

@@ -2214,13 +2214,21 @@ class HttpCli(object):
             raise Pebkac(400, "need hash and wark headers for binary POST")
 
         chashes = [x.strip() for x in chashes]
+        if len(chashes) == 3 and len(chashes[1]) == 1:
+            # the first hash, then length of consecutive hashes,
+            # then a list of stitched hashes as one long string
+            clen = int(chashes[1])
+            siblings = chashes[2]
+            chashes = [chashes[0]]
+            for n in range(0, len(siblings), clen):
+                chashes.append(siblings[n : n + clen])
 
         vfs, _ = self.asrv.vfs.get(self.vpath, self.uname, False, True)
         ptop = (vfs.dbv or vfs).realpath
 
         x = self.conn.hsrv.broker.ask("up2k.handle_chunks", ptop, wark, chashes)
         response = x.get()
-        chunksize, cstarts, path, lastmod, sprs = response
+        chashes, chunksize, cstarts, path, lastmod, sprs = response
         maxsize = chunksize * len(chashes)
         cstart0 = cstarts[0]
 

copyparty/up2k.py

@@ -2851,11 +2851,11 @@ class Up2k(object):
                 # one chunk may occur multiple times in a file;
                 # filter to unique values for the list of missing chunks
                 # (preserve order to reduce disk thrashing)
-                lut = {}
+                lut = set()
                 for k in cj["hash"]:
                     if k not in lut:
                         job["need"].append(k)
-                        lut[k] = 1
+                        lut.add(k)
 
                 try:
                     self._new_upload(job)
@@ -3015,7 +3015,7 @@ class Up2k(object):
 
     def handle_chunks(
         self, ptop: str, wark: str, chashes: list[str]
-    ) -> tuple[int, list[list[int]], str, float, bool]:
+    ) -> tuple[list[str], int, list[list[int]], str, float, bool]:
         with self.mutex, self.reg_mutex:
             self.db_act = self.vol_act[ptop] = time.time()
             job = self.registry[ptop].get(wark)
@@ -3024,12 +3024,37 @@ class Up2k(object):
                 self.log("unknown wark [{}], known: {}".format(wark, known))
                 raise Pebkac(400, "unknown wark" + SSEELOG)
 
+            if len(chashes) > 1 and len(chashes[1]) < 44:
+                # first hash is full-length; expand remaining ones
+                uniq = []
+                lut = set()
+                for chash in job["hash"]:
+                    if chash not in lut:
+                        uniq.append(chash)
+                        lut.add(chash)
+                try:
+                    nchunk = uniq.index(chashes[0])
+                except:
+                    raise Pebkac(400, "unknown chunk0 [%s]" % (chashes[0]))
+                expanded = [chashes[0]]
+                for prefix in chashes[1:]:
+                    nchunk += 1
+                    chash = uniq[nchunk]
+                    if not chash.startswith(prefix):
+                        t = "next sibling chunk does not start with expected prefix [%s]: [%s]"
+                        raise Pebkac(400, t % (prefix, chash))
+                    expanded.append(chash)
+                chashes = expanded
+
             for chash in chashes:
                 if chash not in job["need"]:
                     msg = "chash = {} , need:\n".format(chash)
                     msg += "\n".join(job["need"])
                     self.log(msg)
-                    raise Pebkac(400, "already got that (%s) but thanks??" % (chash,))
+                    t = "already got that (%s) but thanks??"
+                    if chash not in job["hash"]:
+                        t = "unknown chunk wtf: %s"
+                    raise Pebkac(400, t % (chash,))
 
                 if chash in job["busy"]:
                     nh = len(job["hash"])
@@ -3070,7 +3095,7 @@ class Up2k(object):
 
         job["poke"] = time.time()
 
-        return chunksize, coffsets, path, job["lmod"], job["sprs"]
+        return chashes, chunksize, coffsets, path, job["lmod"], job["sprs"]
 
     def release_chunks(self, ptop: str, wark: str, chashes: list[str]) -> bool:
         with self.reg_mutex:

copyparty/web/up2k.js

@@ -2662,12 +2662,20 @@ function up2k_init(subtle) {
                 console.log('chunkpit onerror,', ++tries, t.name, t);
                 orz2(xhr);
             };
-            var chashes = [];
-            for (var a = pcar; a <= pcdr; a++)
-                chashes.push(t.hash[a]);
+
+            var chashes = [],
+                ctxt = t.hash[pcar],
+                plen = Math.floor(192 / nparts.length);
+
+            plen = plen > 9 ? 9 : plen < 2 ? 2 : plen;
+            for (var a = pcar + 1; a <= pcdr; a++)
+                chashes.push(t.hash[a].slice(0, plen));
+
+            if (chashes.length)
+                ctxt += ',' + plen + ',' + chashes.join('');
 
             xhr.open('POST', t.purl, true);
-            xhr.setRequestHeader("X-Up2k-Hash", chashes.join(","));
+            xhr.setRequestHeader("X-Up2k-Hash", ctxt);
             xhr.setRequestHeader("X-Up2k-Wark", t.wark);
             xhr.setRequestHeader("X-Up2k-Stat", "{0}/{1}/{2}/{3} {4}/{5} {6}".format(
                 pvis.ctr.ok, pvis.ctr.ng, pvis.ctr.bz, pvis.ctr.q, btot, btot - bfin,