support multiple concurrent negentropy trees

golpe.yaml

@@ -17,6 +17,7 @@ tables:
     fields:
       - name: dbVersion
       - name: endianness
+      - name: negentropyModificationCounter
 
   ## Meta-info of nostr events, suitable for indexing
   ## Primary key is auto-incremented, called "levId" for Local EVent ID
@@ -76,6 +77,11 @@ tables:
       - name: dict
         type: ubytes
 
+  NegentropyFilter:
+    fields:
+      - name: filter
+        type: string
+
 tablesRaw:
   ## Raw nostr event JSON, possibly compressed
   ## keys are levIds

src/NegentropyFilterCache.h

@@ -0,0 +1,59 @@
+#pragma once
+
+#include <string>
+
+#include <negentropy/storage/BTreeLMDB.h>
+
+#include "golpe.h"
+
+#include "filters.h"
+#include "PackedEvent.h"
+
+
+struct NegentropyFilterCache {
+    struct FilterInfo {
+        NostrFilter f;
+        uint64_t treeId;
+    };
+
+    std::vector<FilterInfo> filters;
+    uint64_t modificationCounter = 0;
+
+    void ctx(lmdb::txn &txn, const std::function<void(const std::function<void(const PackedEventView &, bool)> &)> &cb) {
+        freshenCache(txn);
+
+        std::vector<std::unique_ptr<negentropy::storage::BTreeLMDB>> storages(filters.size());
+
+        cb([&](const PackedEventView &ev, bool insert){
+            for (size_t i = 0; i < filters.size(); i++) {
+                const auto &filter = filters[i];
+
+                if (!filter.f.doesMatch(ev)) continue;
+
+                if (!storages[i]) storages[i] = std::make_unique<negentropy::storage::BTreeLMDB>(txn, negentropyDbi, filter.treeId);
+
+                if (insert) storages[i]->insert(ev.created_at(), ev.id());
+                else storages[i]->erase(ev.created_at(), ev.id());
+            }
+        });
+    }
+
+  private:
+    void freshenCache(lmdb::txn &txn) {
+        uint64_t curr = env.lookup_Meta(txn, 1)->negentropyModificationCounter();
+
+        if (curr != modificationCounter) {
+            filters.clear();
+
+            env.foreach_NegentropyFilter(txn, [&](auto &f){
+                filters.emplace_back(
+                    NostrFilter(tao::json::from_string(f.filter()), MAX_U64),
+                    f.primaryKeyId
+                );
+                return true;
+            });
+
+            modificationCounter = curr;
+        }
+    }
+};

src/WriterPipeline.h

@@ -85,6 +85,8 @@ struct WriterPipeline {
         writerThread = std::thread([&]() {
             setThreadName("Writer");
 
+            NegentropyFilterCache neFilterCache;
+
             while (1) {
                 // Debounce
 
@@ -141,7 +143,7 @@ struct WriterPipeline {
                 if (newEventsToProc.size()) {
                     {
                         auto txn = env.txn_rw();
-                        writeEvents(txn, newEventsToProc);
+                        writeEvents(txn, neFilterCache, newEventsToProc);
                         txn.commit();
                     }
 

src/apps/dbutils/cmd_delete.cpp

@@ -68,13 +68,10 @@ void cmd_delete(const std::vector<std::string> &subArgs) {
 
     {
         auto txn = env.txn_rw();
-        negentropy::storage::BTreeLMDB negentropyStorage(txn, negentropyDbi, 0);
+        NegentropyFilterCache neFilterCache;
 
-        for (auto levId : levIds) {
-            deleteEvent(txn, levId, negentropyStorage);
-        }
+        deleteEvents(txn, neFilterCache, levIds);
 
-        negentropyStorage.flush();
         txn.commit();
     }
 }

src/apps/dbutils/cmd_negentropy.cpp

@@ -0,0 +1,122 @@
+#include <iostream>
+
+#include <docopt.h>
+#include "golpe.h"
+
+#include "NegentropyFilterCache.h"
+#include "events.h"
+#include "DBQuery.h"
+
+
+static const char USAGE[] =
+R"(
+    Usage:
+      negentropy list
+      negentropy add <filter>
+      negentropy build <treeId>
+)";
+
+
+static void increaseModCounter(lmdb::txn &txn) {
+    auto m = env.lookup_Meta(txn, 1);
+    if (!m) throw herr("no Meta entry?");
+    env.update_Meta(txn, *m, { .negentropyModificationCounter = m->negentropyModificationCounter() + 1 });
+}
+
+
+void cmd_negentropy(const std::vector<std::string> &subArgs) {
+    std::map<std::string, docopt::value> args = docopt::docopt(USAGE, subArgs, true, "");
+
+    if (args["list"].asBool()) {
+        auto txn = env.txn_ro();
+
+        env.foreach_NegentropyFilter(txn, [&](auto &f){
+            auto treeId = f.primaryKeyId;
+
+            std::cout << "tree " << treeId << "\n";
+            std::cout << "  filter: " << f.filter() << "\n";
+
+            negentropy::storage::BTreeLMDB storage(txn, negentropyDbi, treeId);
+            auto size = storage.size();
+            std::cout << "  size: " << size << "\n";
+            std::cout << "  fingerprint: " << to_hex(storage.fingerprint(0, size).sv()) << "\n";
+
+            return true;
+        });
+    } else if (args["add"].asBool()) {
+        std::string filterStr = args["<filter>"].asString();
+
+        tao::json::value filterJson = tao::json::from_string(filterStr);
+        auto compiledFilter = NostrFilterGroup::unwrapped(filterJson);
+
+        if (compiledFilter.filters.size() == 1 && (compiledFilter.filters[0].since != 0 || compiledFilter.filters[0].until != MAX_U64)) {
+            throw herr("single filters should not have since/until");
+        }
+        if (compiledFilter.filters.size() == 0) throw herr("filter will never match");
+
+        filterStr = tao::json::to_string(filterJson); // make canonical
+
+        auto txn = env.txn_rw();
+        increaseModCounter(txn);
+
+        env.foreach_NegentropyFilter(txn, [&](auto &f){
+            if (f.filter() == filterStr) throw herr("filter already exists as tree: ", f.primaryKeyId);
+            return true;
+        });
+
+        uint64_t treeId = env.insert_NegentropyFilter(txn, filterStr);
+        txn.commit();
+
+        std::cout << "created tree " << treeId << "\n";
+        std::cout << "  to populate, run: strfry negentropy build " << treeId << "\n";
+    } else if (args["build"].asBool()) {
+        uint64_t treeId = args["<treeId>"].asLong();
+
+        struct Record {
+            uint64_t created_at;
+            uint8_t id[32];
+        };
+
+        std::vector<Record> recs;
+
+        auto txn = env.txn_rw(); // FIXME: split this into a read-only phase followed by a write
+        increaseModCounter(txn);
+
+        // Get filter
+
+        std::string filterStr;
+
+        {
+            auto view = env.lookup_NegentropyFilter(txn, treeId);
+            if (!view) throw herr("couldn't find treeId: ", treeId);
+            filterStr = view->filter();
+        }
+
+        // Query all matching events
+
+        DBQuery query(tao::json::from_string(filterStr));
+
+        while (1) {
+            bool complete = query.process(txn, [&](const auto &sub, uint64_t levId){
+                auto ev = lookupEventByLevId(txn, levId);
+                auto packed = PackedEventView(ev.buf);
+                recs.push_back({ packed.created_at(), });
+                memcpy(recs.back().id, packed.id().data(), 32);
+            });
+
+            if (complete) break;
+        }
+
+        // Store events in negentropy tree
+
+        negentropy::storage::BTreeLMDB storage(txn, negentropyDbi, treeId);
+
+        for (const auto &r : recs) {
+            storage.insert(r.created_at, std::string_view((char*)r.id, 32));
+        }
+
+        storage.flush();
+
+        txn.commit();
+    }
+}

src/apps/mesh/cmd_sync.cpp

@@ -50,39 +50,56 @@ void cmd_sync(const std::vector<std::string> &subArgs) {
     tao::json::value filterJson = tao::json::from_string(filterStr);
     auto filterCompiled = NostrFilterGroup::unwrapped(filterJson);
 
-
-    bool isFullDbQuery = filterCompiled.isFullDbQuery();
+    std::optional<uint64_t> treeId;
     negentropy::storage::Vector storageVector;
 
-    if (!isFullDbQuery) {
-        DBQuery query(filterJson);
-        Decompressor decomp;
 
+    {
         auto txn = env.txn_ro();
 
-        uint64_t numEvents = 0;
-        std::vector<uint64_t> levIds;
-
-        while (1) {
-            bool complete = query.process(txn, [&](const auto &sub, uint64_t levId){
-                levIds.push_back(levId);
-                numEvents++;
-            });
-
-            if (complete) break;
+        auto filterJsonNoTimes = filterJson;
+        if (filterJsonNoTimes.is_object()) {
+            filterJsonNoTimes.get_object().erase("since");
+            filterJsonNoTimes.get_object().erase("until");
         }
+        auto filterJsonNoTimesStr = tao::json::to_string(filterJsonNoTimes);
 
-        std::sort(levIds.begin(), levIds.end());
+        env.foreach_NegentropyFilter(txn, [&](auto &f){
+            if (f.filter() == filterJsonNoTimesStr) {
+                treeId = f.primaryKeyId;
+                return false;
+            }
+            return true;
+        });
 
-        for (auto levId : levIds) {
-            auto ev = lookupEventByLevId(txn, levId);
-            PackedEventView packed(ev.buf);
-            storageVector.insert(packed.created_at(), packed.id());
+        if (!treeId) {
+            DBQuery query(filterJson);
+            Decompressor decomp;
+
+            uint64_t numEvents = 0;
+            std::vector<uint64_t> levIds;
+
+            while (1) {
+                bool complete = query.process(txn, [&](const auto &sub, uint64_t levId){
+                    levIds.push_back(levId);
+                    numEvents++;
+                });
+
+                if (complete) break;
+            }
+
+            std::sort(levIds.begin(), levIds.end());
+
+            for (auto levId : levIds) {
+                auto ev = lookupEventByLevId(txn, levId);
+                PackedEventView packed(ev.buf);
+                storageVector.insert(packed.created_at(), packed.id());
+            }
+
+            LI << "Filter matches " << numEvents << " events";
+
+            storageVector.seal();
         }
-
-        LI << "Filter matches " << numEvents << " events";
-
-        storageVector.seal();
     }
 
 
@@ -98,8 +115,8 @@ void cmd_sync(const std::vector<std::string> &subArgs) {
         auto txn = env.txn_ro();
         std::string neMsg;
 
-        if (isFullDbQuery) {
-            negentropy::storage::BTreeLMDB storageBtree(txn, negentropyDbi, 0);
+        if (treeId) {
+            negentropy::storage::BTreeLMDB storageBtree(txn, negentropyDbi, *treeId);
 
             const auto &f = filterCompiled.filters.at(0);
             negentropy::storage::SubRange subStorage(storageBtree, negentropy::Bound(f.since), negentropy::Bound(f.until == MAX_U64 ? MAX_U64 : f.until + 1));
@@ -151,8 +168,8 @@ void cmd_sync(const std::vector<std::string> &subArgs) {
                 try {
                     auto inputMsg = from_hex(msg.at(2).get_string());
 
-                    if (isFullDbQuery) {
-                        negentropy::storage::BTreeLMDB storageBtree(txn, negentropyDbi, 0);
+                    if (treeId) {
+                        negentropy::storage::BTreeLMDB storageBtree(txn, negentropyDbi, *treeId);
 
                         const auto &f = filterCompiled.filters.at(0);
                         negentropy::storage::SubRange subStorage(storageBtree, negentropy::Bound(f.since), negentropy::Bound(f.until == MAX_U64 ? MAX_U64 : f.until + 1));

src/apps/relay/RelayCron.cpp

@@ -50,15 +50,10 @@ void RelayServer::runCron() {
 
         if (expiredLevIds.size() > 0) {
             auto txn = env.txn_rw();
-            negentropy::storage::BTreeLMDB negentropyStorage(txn, negentropyDbi, 0);
+            NegentropyFilterCache neFilterCache;
 
-            uint64_t numDeleted = 0;
+            uint64_t numDeleted = deleteEvents(txn, neFilterCache, expiredLevIds);
 
-            for (auto levId : expiredLevIds) {
-                if (deleteEvent(txn, levId, negentropyStorage)) numDeleted++;
-            }
-
-            negentropyStorage.flush();
             txn.commit();
 
             if (numDeleted) LI << "Deleted " << numDeleted << " events (ephemeral=" << numEphemeral << " expired=" << numExpired << ")";

src/apps/relay/RelayIngester.cpp

@@ -134,15 +134,22 @@ void RelayServer::ingesterProcessNegentropy(lmdb::txn &txn, Decompressor &decomp
     if (arr.at(0) == "NEG-OPEN") {
         if (arr.get_array().size() < 4) throw herr("negentropy query missing elements");
 
-        NostrFilterGroup filter;
         auto maxFilterLimit = cfg().relay__negentropy__maxSyncEvents + 1;
 
-        filter = std::move(NostrFilterGroup::unwrapped(arr.at(2), maxFilterLimit));
+        auto filterJson = arr.at(2);
+
+        NostrFilterGroup filter = NostrFilterGroup::unwrapped(filterJson, maxFilterLimit);
         Subscription sub(connId, arr[1].get_string(), std::move(filter));
 
+        if (filterJson.is_object()) {
+            filterJson.get_object().erase("since");
+            filterJson.get_object().erase("until");
+        }
+        std::string filterStr = tao::json::to_string(filterJson);
+
         std::string negPayload = from_hex(arr.at(3).get_string());
 
-        tpNegentropy.dispatch(connId, MsgNegentropy{MsgNegentropy::NegOpen{std::move(sub), std::move(negPayload)}});
+        tpNegentropy.dispatch(connId, MsgNegentropy{MsgNegentropy::NegOpen{std::move(sub), std::move(filterStr), std::move(negPayload)}});
     } else if (arr.at(0) == "NEG-MSG") {
         std::string negPayload = from_hex(arr.at(2).get_string());
         tpNegentropy.dispatch(connId, MsgNegentropy{MsgNegentropy::NegMsg{connId, SubId(arr[1].get_string()), std::move(negPayload)}});

src/apps/relay/RelayNegentropy.cpp

@@ -17,6 +17,7 @@ struct NegentropyViews {
 
     struct StatelessView {
         Subscription sub;
+        uint64_t treeId;
     };
 
     using UserView = std::variant<MemoryView, StatelessView>;
@@ -42,7 +43,7 @@ struct NegentropyViews {
         return true;
     }
 
-    bool addStatelessView(uint64_t connId, const SubId &subId, Subscription &&sub) {
+    bool addStatelessView(uint64_t connId, const SubId &subId, Subscription &&sub, uint64_t treeId) {
         {
             auto *existing = findView(connId, subId);
             if (existing) removeView(connId, subId);
@@ -55,7 +56,7 @@ struct NegentropyViews {
             return false;
         }
 
-        connViews.try_emplace(subId, UserView{ StatelessView{ std::move(sub), } });
+        connViews.try_emplace(subId, UserView{ StatelessView{ std::move(sub), treeId, } });
 
         return true;
     }
@@ -188,15 +189,24 @@ void RelayServer::runNegentropy(ThreadPool<MsgNegentropy>::Thread &thr) {
             if (auto msg = std::get_if<MsgNegentropy::NegOpen>(&newMsg.msg)) {
                 auto connId = msg->sub.connId;
                 auto subId = msg->sub.subId;
+                std::optional<uint64_t> treeId;
 
-                if (msg->sub.filterGroup.isFullDbQuery()) {
-                    negentropy::storage::BTreeLMDB storage(txn, negentropyDbi, 0);
+                env.foreach_NegentropyFilter(txn, [&](auto &f){
+                    if (f.filter() == msg->filterStr) {
+                        treeId = f.primaryKeyId;
+                        return false;
+                    }
+                    return true;
+                });
+
+                if (treeId) {
+                    negentropy::storage::BTreeLMDB storage(txn, negentropyDbi, *treeId);
 
                     const auto &f = msg->sub.filterGroup.filters.at(0);
                     negentropy::storage::SubRange subStorage(storage, negentropy::Bound(f.since), negentropy::Bound(f.until == MAX_U64 ? MAX_U64 : f.until + 1));
                     handleReconcile(connId, subId, subStorage, msg->negPayload);
 
-                    if (!views.addStatelessView(connId, subId, std::move(msg->sub))) {
+                    if (!views.addStatelessView(connId, subId, std::move(msg->sub), *treeId)) {
                         queries.removeSub(connId, subId);
                         sendNoticeError(connId, std::string("too many concurrent NEG requests"));
                     }
@@ -231,7 +241,7 @@ void RelayServer::runNegentropy(ThreadPool<MsgNegentropy>::Thread &thr) {
                     }
                     handleReconcile(msg->connId, msg->subId, view->storageVector, msg->negPayload);
                 } else if (auto *view = std::get_if<NegentropyViews::StatelessView>(userView)) {
-                    negentropy::storage::BTreeLMDB storage(txn, negentropyDbi, 0);
+                    negentropy::storage::BTreeLMDB storage(txn, negentropyDbi, view->treeId);
 
                     const auto &f = view->sub.filterGroup.filters.at(0);
                     negentropy::storage::SubRange subStorage(storage, negentropy::Bound(f.since), negentropy::Bound(f.until == MAX_U64 ? MAX_U64 : f.until + 1));

src/apps/relay/RelayServer.h

@@ -122,6 +122,7 @@ struct MsgReqMonitor : NonCopyable {
 struct MsgNegentropy : NonCopyable {
     struct NegOpen {
         Subscription sub;
+        std::string filterStr;
         std::string negPayload;
     };
 

src/apps/relay/RelayWriter.cpp

@@ -5,6 +5,7 @@
 
 void RelayServer::runWriter(ThreadPool<MsgWriter>::Thread &thr) {
     PluginEventSifter writePolicyPlugin;
+    NegentropyFilterCache neFilterCache;
 
     while(1) {
         auto newMsgs = thr.inbox.pop_all();
@@ -61,7 +62,7 @@ void RelayServer::runWriter(ThreadPool<MsgWriter>::Thread &thr) {
 
         try {
             auto txn = env.txn_rw();
-            writeEvents(txn, newEvents);
+            writeEvents(txn, neFilterCache, newEvents);
             txn.commit();
         } catch (std::exception &e) {
             LE << "Error writing " << newEvents.size() << " events: " << e.what();

src/events.cpp

@@ -227,23 +227,17 @@ std::string_view getEventJson(lmdb::txn &txn, Decompressor &decomp, uint64_t lev
 
 
 
+// Do not use externally: does not handle negentropy trees
 
-bool deleteEvent(lmdb::txn &txn, uint64_t levId, negentropy::storage::BTreeLMDB &negentropyStorage) {
-    auto view = env.lookup_Event(txn, levId);
-    if (!view) return false;
-    PackedEventView packed(view->buf);
-
-    negentropyStorage.erase(packed.created_at(), packed.id());
-
+bool deleteEventBasic(lmdb::txn &txn, uint64_t levId) {
     bool deleted = env.dbi_EventPayload.del(txn, lmdb::to_sv<uint64_t>(levId));
     env.delete_Event(txn, levId);
-
     return deleted;
 }
 
 
 
-void writeEvents(lmdb::txn &txn, std::vector<EventToWrite> &evs, uint64_t logLevel) {
+void writeEvents(lmdb::txn &txn, NegentropyFilterCache &neFilterCache, std::vector<EventToWrite> &evs, uint64_t logLevel) {
     std::sort(evs.begin(), evs.end(), [](auto &a, auto &b) {
         auto aC = a.createdAt();
         auto bC = b.createdAt();
@@ -254,95 +248,99 @@ void writeEvents(lmdb::txn &txn, std::vector<EventToWrite> &evs, uint64_t logLev
     std::vector<uint64_t> levIdsToDelete;
     std::string tmpBuf;
 
-    negentropy::storage::BTreeLMDB negentropyStorage(txn, negentropyDbi, 0);
+    neFilterCache.ctx(txn, [&](const std::function<void(const PackedEventView &, bool)> &updateNegentropy){
+        for (size_t i = 0; i < evs.size(); i++) {
+            auto &ev = evs[i];
 
-    for (size_t i = 0; i < evs.size(); i++) {
-        auto &ev = evs[i];
+            PackedEventView packed(ev.packedStr);
 
-        PackedEventView packed(ev.packedStr);
+            if (lookupEventById(txn, packed.id()) || (i != 0 && ev.id() == evs[i-1].id())) {
+                ev.status = EventWriteStatus::Duplicate;
+                continue;
+            }
 
-        if (lookupEventById(txn, packed.id()) || (i != 0 && ev.id() == evs[i-1].id())) {
-            ev.status = EventWriteStatus::Duplicate;
-            continue;
-        }
+            if (env.lookup_Event__deletion(txn, std::string(packed.id()) + std::string(packed.pubkey()))) {
+                ev.status = EventWriteStatus::Deleted;
+                continue;
+            }
 
-        if (env.lookup_Event__deletion(txn, std::string(packed.id()) + std::string(packed.pubkey()))) {
-            ev.status = EventWriteStatus::Deleted;
-            continue;
-        }
+            {
+                std::optional<std::string> replace;
 
-        {
-            std::optional<std::string> replace;
+                if (isReplaceableKind(packed.kind()) || isParamReplaceableKind(packed.kind())) {
+                    packed.foreachTag([&](char tagName, std::string_view tagVal){
+                        if (tagName != 'd') return true;
+                        replace = std::string(tagVal);
+                        return false;
+                    });
+                }
 
-            if (isReplaceableKind(packed.kind()) || isParamReplaceableKind(packed.kind())) {
+                if (replace) {
+                    auto searchStr = std::string(packed.pubkey()) + *replace;
+                    auto searchKey = makeKey_StringUint64(searchStr, packed.kind());
+
+                    env.generic_foreachFull(txn, env.dbi_Event__replace, searchKey, lmdb::to_sv<uint64_t>(MAX_U64), [&](auto k, auto v) {
+                        ParsedKey_StringUint64 parsedKey(k);
+                        if (parsedKey.s == searchStr && parsedKey.n == packed.kind()) {
+                            auto otherEv = lookupEventByLevId(txn, lmdb::from_sv<uint64_t>(v));
+
+                            auto thisTimestamp = packed.created_at();
+                            auto otherPacked = PackedEventView(otherEv.buf);
+                            auto otherTimestamp = otherPacked.created_at();
+
+                            if (otherTimestamp < thisTimestamp ||
+                                (otherTimestamp == thisTimestamp && packed.id() < otherPacked.id())) {
+                                if (logLevel >= 1) LI << "Deleting event (d-tag). id=" << to_hex(otherPacked.id());
+                                levIdsToDelete.push_back(otherEv.primaryKeyId);
+                            } else {
+                                ev.status = EventWriteStatus::Replaced;
+                            }
+                        }
+
+                        return false;
+                    }, true);
+                }
+            }
+
+            if (packed.kind() == 5) {
+                // Deletion event, delete all referenced events
                 packed.foreachTag([&](char tagName, std::string_view tagVal){
-                    if (tagName != 'd') return true;
-                    replace = std::string(tagVal);
-                    return false;
+                    if (tagName == 'e') {
+                        auto otherEv = lookupEventById(txn, tagVal);
+                        if (otherEv && PackedEventView(otherEv->buf).pubkey() == packed.pubkey()) {
+                            if (logLevel >= 1) LI << "Deleting event (kind 5). id=" << to_hex(tagVal);
+                            levIdsToDelete.push_back(otherEv->primaryKeyId);
+                        }
+                    }
+                    return true;
                 });
             }
 
-            if (replace) {
-                auto searchStr = std::string(packed.pubkey()) + *replace;
-                auto searchKey = makeKey_StringUint64(searchStr, packed.kind());
+            if (ev.status == EventWriteStatus::Pending) {
+                ev.levId = env.insert_Event(txn, ev.packedStr);
 
-                env.generic_foreachFull(txn, env.dbi_Event__replace, searchKey, lmdb::to_sv<uint64_t>(MAX_U64), [&](auto k, auto v) {
-                    ParsedKey_StringUint64 parsedKey(k);
-                    if (parsedKey.s == searchStr && parsedKey.n == packed.kind()) {
-                        auto otherEv = lookupEventByLevId(txn, lmdb::from_sv<uint64_t>(v));
+                tmpBuf.clear();
+                tmpBuf += '\x00';
+                tmpBuf += ev.jsonStr;
+                env.dbi_EventPayload.put(txn, lmdb::to_sv<uint64_t>(ev.levId), tmpBuf);
 
-                        auto thisTimestamp = packed.created_at();
-                        auto otherPacked = PackedEventView(otherEv.buf);
-                        auto otherTimestamp = otherPacked.created_at();
+                updateNegentropy(PackedEventView(ev.packedStr), true);
 
-                        if (otherTimestamp < thisTimestamp ||
-                            (otherTimestamp == thisTimestamp && packed.id() < otherPacked.id())) {
-                            if (logLevel >= 1) LI << "Deleting event (d-tag). id=" << to_hex(otherPacked.id());
-                            levIdsToDelete.push_back(otherEv.primaryKeyId);
-                        } else {
-                            ev.status = EventWriteStatus::Replaced;
-                        }
-                    }
+                ev.status = EventWriteStatus::Written;
 
-                    return false;
-                }, true);
-            }
-        }
+                // Deletions happen after event was written to ensure levIds are not reused
 
-        if (packed.kind() == 5) {
-            // Deletion event, delete all referenced events
-            packed.foreachTag([&](char tagName, std::string_view tagVal){
-                if (tagName == 'e') {
-                    auto otherEv = lookupEventById(txn, tagVal);
-                    if (otherEv && PackedEventView(otherEv->buf).pubkey() == packed.pubkey()) {
-                        if (logLevel >= 1) LI << "Deleting event (kind 5). id=" << to_hex(tagVal);
-                        levIdsToDelete.push_back(otherEv->primaryKeyId);
-                    }
+                for (auto levId : levIdsToDelete) {
+                    auto evToDel = env.lookup_Event(txn, levId);
+                    if (!evToDel) continue; // already deleted
+                    updateNegentropy(PackedEventView(evToDel->buf), false);
+                    deleteEventBasic(txn, levId);
                 }
-                return true;
-            });
+
+                levIdsToDelete.clear();
+            }
+
+            if (levIdsToDelete.size()) throw herr("unprocessed deletion");
         }
-
-        if (ev.status == EventWriteStatus::Pending) {
-            ev.levId = env.insert_Event(txn, ev.packedStr);
-
-            tmpBuf.clear();
-            tmpBuf += '\x00';
-            tmpBuf += ev.jsonStr;
-            env.dbi_EventPayload.put(txn, lmdb::to_sv<uint64_t>(ev.levId), tmpBuf);
-
-            negentropyStorage.insert(ev.createdAt(), ev.id());
-
-            ev.status = EventWriteStatus::Written;
-
-            // Deletions happen after event was written to ensure levIds are not reused
-
-            for (auto levId : levIdsToDelete) deleteEvent(txn, levId, negentropyStorage);
-            levIdsToDelete.clear();
-        }
-
-        if (levIdsToDelete.size()) throw herr("unprocessed deletion");
-    }
-
-    negentropyStorage.flush();
+    });
 }

src/events.h

@@ -1,11 +1,11 @@
 #pragma once
 
 #include <secp256k1_schnorrsig.h>
-#include <negentropy/storage/BTreeLMDB.h>
 
 #include "golpe.h"
 
 #include "PackedEvent.h"
+#include "NegentropyFilterCache.h"
 #include "Decompressor.h"
 
 
@@ -99,6 +99,7 @@ struct EventToWrite {
     EventToWrite(std::string packedStr, std::string jsonStr, void *userData = nullptr) : packedStr(packedStr), jsonStr(jsonStr), userData(userData) {
     }
 
+    // FIXME: do we need these methods anymore?
     std::string_view id() {
         return PackedEventView(packedStr).id();
     }
@@ -109,5 +110,21 @@ struct EventToWrite {
 };
 
 
-void writeEvents(lmdb::txn &txn, std::vector<EventToWrite> &evs, uint64_t logLevel = 1);
-bool deleteEvent(lmdb::txn &txn, uint64_t levId, negentropy::storage::BTreeLMDB &negentropyStorage);
+void writeEvents(lmdb::txn &txn, NegentropyFilterCache &neFilterCache, std::vector<EventToWrite> &evs, uint64_t logLevel = 1);
+bool deleteEventBasic(lmdb::txn &txn, uint64_t levId);
+
+template <typename C>
+uint64_t deleteEvents(lmdb::txn &txn, NegentropyFilterCache &neFilterCache, const C &levIds) {
+    uint64_t numDeleted = 0;
+
+    neFilterCache.ctx(txn, [&](const std::function<void(const PackedEventView &, bool)> &updateNegentropy){
+        for (auto levId : levIds) {
+            auto evToDel = env.lookup_Event(txn, levId);
+            if (!evToDel) continue; // already deleted
+            updateNegentropy(PackedEventView(evToDel->buf), false);
+            if (deleteEventBasic(txn, levId)) numDeleted++;
+        }
+    });
+
+    return numDeleted;
+}

src/onAppStartup.cpp

@@ -24,7 +24,8 @@ static void dbCheck(lmdb::txn &txn, const std::string &cmd) {
     auto s = env.lookup_Meta(txn, 1);
 
     if (!s) {
-        env.insert_Meta(txn, CURR_DB_VERSION, 1);
+        env.insert_Meta(txn, CURR_DB_VERSION, 1, 1);
+        env.insert_NegentropyFilter(txn, "{}");
         return;
     }