Make the load generator's devices real link senders, many on one thread

links.c was a second implementation of the packet format; each device is
now a PureLinkSender on a socket of its own, keyed with a secret made
outside (pure_link_sender_shared: a key kept elsewhere, or a test's
many). M1 (1k, 10k) and M2 (10k, kill -9) pass with it: no silent step,
caught up in 0.2 s, every order applied once; the slowest store after
the restart is now the sender's 1 s wait for a word of the save
(STORED_WAIT), where the old devices tried again after 200 ms.

1 files changed, 6 insertions, 2 deletions

diff --git a/link/link-protocol.h b/link/link-protocol.h
index b0f8ef3..3037926 100644
--- a/link/link-protocol.h
+++ b/link/link-protocol.h
@@ -67,14 +67,18 @@ typedef struct {
 /* ---- The sending side: one output's saved sends to a receiver's input, as
  * source (the receiver's name for it), their messages of shape (the
  * receiver's input must have the same: core/module.h's pure_module_shape),
- * from own (this node's key, whose public half is own_public). NULL when
- * the names are not 1 to PURE_LINK_NAME bytes, or memory runs out. */
+ * from own (this node's key, whose public half is own_public; NULL when
+ * the secret comes from elsewhere). NULL when the names are not 1 to
+ * PURE_LINK_NAME bytes, or memory runs out. */
 typedef struct PureLinkSender PureLinkSender;
 PureLinkSender *pure_link_sender(const char *source, const char *input, uint32_t shape, const PureSealKey *own,
                                  const unsigned char own_public[PURE_SEAL_KEY]);
 /* The receiver's public key: the keys made from it (one X25519). A sender
  * makes no packet before it has one. */
 bool pure_link_sender_peer(PureLinkSender *, const unsigned char peer[PURE_SEAL_KEY]);
+/* The same with the secret own's key shares with peer's made elsewhere (by
+ * a key kept in hardware, say, or a test's many keys): no X25519 here. */
+bool pure_link_sender_shared(PureLinkSender *, const unsigned char peer[PURE_SEAL_KEY], const unsigned char secret[32]);
 /* A saved send, numbered one past the last queued (any number when none
  * waits); false when it cannot be kept. */
 bool pure_link_sender_queue(PureLinkSender *, uint64_t seq, const unsigned char *bytes, size_t size);