feat(meshtastic): extract LoBBS plugin library

LoBBSReplyCache.cpp

@@ -0,0 +1,83 @@
+#if !MESHTASTIC_EXCLUDE_LOBBS
+
+#include "LoBBSReplyCache.h"
+#include "apps/Config/ConfigCommands.h"
+#include "gps/RTC.h"
+#include <cstddef>
+#include <map>
+#include <string>
+
+#include "LoBBSStackGuard.h"
+
+struct LobbsReplyCacheEntry {
+    LoBBSResponse resp;
+    uint32_t expiresSec = 0;
+};
+
+static std::map<uint32_t, LobbsReplyCacheEntry> lobbsReplyCacheBySession;
+
+static size_t lobbsResponsePayloadBytes(const LoBBSResponse &resp)
+{
+    size_t n = resp.error.size();
+    for (const LoScalar &rec : resp.records) {
+        std::string line;
+        if (rec.encode(line, SIZE_MAX))
+            n += line.size() + 1;
+    }
+    return n;
+}
+
+void lobbsReplyCacheGc(uint32_t nowSec)
+{
+    for (auto it = lobbsReplyCacheBySession.begin(); it != lobbsReplyCacheBySession.end();) {
+        if (nowSec > it->second.expiresSec)
+            it = lobbsReplyCacheBySession.erase(it);
+        else
+            ++it;
+    }
+    while (lobbsReplyCacheBySession.size() > LOBBS_REPLY_CACHE_MAX_ENTRIES) {
+        lobbsReplyCacheBySession.erase(lobbsReplyCacheBySession.begin());
+    }
+}
+
+void lobbsReplyCacheErase(uint32_t sessionNodeId)
+{
+    lobbsReplyCacheBySession.erase(sessionNodeId);
+}
+
+bool lobbsReplyCacheStore(uint32_t sessionNodeId, const LoBBSResponse &resp)
+{
+    if (!resp.ok)
+        return false;
+
+    if (lobbsResponsePayloadBytes(resp) > LOBBS_REPLY_CACHE_MAX_BYTES) {
+        lobbsReplyCacheErase(sessionNodeId);
+        return false;
+    }
+
+    LobbsReplyCacheEntry entry;
+    entry.resp = resp;
+    entry.expiresSec = getTime() + lobbsReplyCacheTtlSec();
+    lobbsReplyCacheBySession[sessionNodeId] = std::move(entry);
+    while (lobbsReplyCacheBySession.size() > LOBBS_REPLY_CACHE_MAX_ENTRIES) {
+        lobbsReplyCacheBySession.erase(lobbsReplyCacheBySession.begin());
+    }
+    return true;
+}
+
+bool lobbsReplyCacheLoad(uint32_t sessionNodeId, LoBBSResponse &out)
+{
+    auto it = lobbsReplyCacheBySession.find(sessionNodeId);
+    if (it == lobbsReplyCacheBySession.end())
+        return false;
+    uint32_t now = getTime();
+    if (now > it->second.expiresSec) {
+        lobbsReplyCacheBySession.erase(it);
+        return false;
+    }
+    it->second.expiresSec = now + lobbsReplyCacheTtlSec();
+    out = it->second.resp;
+    return true;
+}
+
+#endif