510 lines
19 KiB
C++
510 lines
19 KiB
C++
/*
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* pubsub.actor.cpp
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*
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* This source file is part of the FoundationDB open source project
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*
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* Copyright 2013-2022 Apple Inc. and the FoundationDB project authors
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include <cinttypes>
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#include "fdbclient/NativeAPI.actor.h"
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#include "fdbserver/pubsub.h"
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#include "flow/actorcompiler.h" // This must be the last #include.
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Value uInt64ToValue(uint64_t v) {
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return StringRef(format("%016llx", v));
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}
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uint64_t valueToUInt64(const StringRef& v) {
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uint64_t x = 0;
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sscanf(v.toString().c_str(), "%" SCNx64, &x);
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return x;
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}
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Key keyForInbox(uint64_t inbox) {
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return StringRef(format("i/%016llx", inbox));
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}
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Key keyForInboxSubscription(uint64_t inbox, uint64_t feed) {
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return StringRef(format("i/%016llx/subs/%016llx", inbox, feed));
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}
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Key keyForInboxSubscriptionCount(uint64_t inbox) {
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return StringRef(format("i/%016llx/subsCnt", inbox));
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}
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Key keyForInboxStalePrefix(uint64_t inbox) {
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return StringRef(format("i/%016llx/stale/", inbox));
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}
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Key keyForInboxStaleFeed(uint64_t inbox, uint64_t feed) {
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return StringRef(format("i/%016llx/stale/%016llx", inbox, feed));
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}
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Key keyForInboxCacheByIDPrefix(uint64_t inbox) {
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return StringRef(format("i/%016llx/cid/", inbox));
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}
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Key keyForInboxCacheByID(uint64_t inbox, uint64_t messageId) {
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return StringRef(format("i/%016llx/cid/%016llx", inbox, messageId));
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}
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Key keyForInboxCacheByFeedPrefix(uint64_t inbox) {
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return StringRef(format("i/%016llx/cf/", inbox));
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}
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Key keyForInboxCacheByFeed(uint64_t inbox, uint64_t feed) {
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return StringRef(format("i/%016llx/cf/%016llx", inbox, feed));
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}
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Key keyForFeed(uint64_t feed) {
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return StringRef(format("f/%016llx", feed));
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}
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Key keyForFeedSubcriber(uint64_t feed, uint64_t inbox) {
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return StringRef(format("f/%016llx/subs/%016llx", feed, inbox));
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}
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Key keyForFeedSubcriberCount(uint64_t feed) {
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return StringRef(format("f/%016llx/subscCnt", feed));
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}
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Key keyForFeedMessage(uint64_t feed, uint64_t message) {
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return StringRef(format("f/%016llx/m/%016llx", feed, message));
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}
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Key keyForFeedMessagePrefix(uint64_t feed) {
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return StringRef(format("f/%016llx/m/", feed));
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}
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Key keyForFeedMessageCount(uint64_t feed) {
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return StringRef(format("f/%016llx/messCount", feed));
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}
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// the following should go at some point: change over to range query of count 1 from feed message list
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Key keyForFeedLatestMessage(uint64_t feed) {
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return StringRef(format("f/%016llx/latestMessID", feed));
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}
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Key keyForFeedWatcherPrefix(uint64_t feed) {
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return StringRef(format("f/%016llx/watchers/", feed));
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}
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Key keyForFeedWatcher(uint64_t feed, uint64_t inbox) {
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return StringRef(format("f/%016llx/watchers/%016llx", feed, inbox));
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}
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Standalone<StringRef> messagePrefix("m/"_sr);
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Key keyForMessage(uint64_t message) {
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return StringRef(format("m/%016llx", message));
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}
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Key keyForDisptchEntry(uint64_t message) {
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return StringRef(format("d/%016llx", message));
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}
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PubSub::PubSub(Database _cx) : cx(_cx) {}
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ACTOR Future<uint64_t> _createFeed(Database cx, Standalone<StringRef> metadata) {
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state uint64_t id(deterministicRandom()->randomUniqueID().first()); // SOMEDAY: this should be an atomic increment
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TraceEvent("PubSubCreateFeed").detail("Feed", id);
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state Transaction tr(cx);
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loop {
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try {
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state Optional<Value> val = wait(tr.get(keyForFeed(id)));
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while (val.present()) {
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id = id + deterministicRandom()->randomInt(1, 100);
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Optional<Value> v = wait(tr.get(keyForFeed(id)));
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val = v;
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}
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tr.set(keyForFeed(id), metadata);
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tr.set(keyForFeedSubcriberCount(id), uInt64ToValue(0));
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tr.set(keyForFeedMessageCount(id), uInt64ToValue(0));
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wait(tr.commit());
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break;
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} catch (Error& e) {
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wait(tr.onError(e));
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}
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}
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return id;
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}
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Future<uint64_t> PubSub::createFeed(Standalone<StringRef> metadata) {
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return _createFeed(cx, metadata);
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}
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ACTOR Future<uint64_t> _createInbox(Database cx, Standalone<StringRef> metadata) {
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state uint64_t id = deterministicRandom()->randomUniqueID().first();
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TraceEvent("PubSubCreateInbox").detail("Inbox", id);
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state Transaction tr(cx);
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loop {
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try {
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state Optional<Value> val = wait(tr.get(keyForInbox(id)));
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while (val.present()) {
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id += deterministicRandom()->randomInt(1, 100);
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Optional<Value> v = wait(tr.get(keyForFeed(id)));
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val = v;
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}
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tr.set(keyForInbox(id), metadata);
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tr.set(keyForInboxSubscriptionCount(id), uInt64ToValue(0));
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wait(tr.commit());
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break;
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} catch (Error& e) {
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wait(tr.onError(e));
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}
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}
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return id;
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}
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Future<uint64_t> PubSub::createInbox(Standalone<StringRef> metadata) {
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return _createInbox(cx, metadata);
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}
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ACTOR Future<bool> _createSubscription(Database cx, uint64_t feed, uint64_t inbox) {
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state Transaction tr(cx);
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TraceEvent("PubSubCreateSubscription").detail("Feed", feed).detail("Inbox", inbox);
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loop {
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try {
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Optional<Value> subscription = wait(tr.get(keyForInboxSubscription(inbox, feed)));
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if (subscription.present()) {
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// For idempotency, this could exist from a previous transaction from us that succeeded
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return true;
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}
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Optional<Value> inboxVal = wait(tr.get(keyForInbox(inbox)));
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if (!inboxVal.present()) {
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return false;
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}
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Optional<Value> feedVal = wait(tr.get(keyForFeed(feed)));
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if (!feedVal.present()) {
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return false;
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}
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// Update the subscriptions of the inbox
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Optional<Value> subscriptionCountVal = wait(tr.get(keyForInboxSubscriptionCount(inbox)));
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uint64_t subscriptionCount = valueToUInt64(subscriptionCountVal.get()); // throws if count not present
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tr.set(keyForInboxSubscription(inbox, feed), StringRef());
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tr.set(keyForInboxSubscriptionCount(inbox), uInt64ToValue(subscriptionCount + 1));
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// Update the subcribers of the feed
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Optional<Value> subcriberCountVal = wait(tr.get(keyForFeedSubcriberCount(feed)));
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uint64_t subcriberCount = valueToUInt64(subcriberCountVal.get()); // throws if count not present
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tr.set(keyForFeedSubcriber(feed, inbox), StringRef());
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tr.set(keyForFeedSubcriberCount(inbox), uInt64ToValue(subcriberCount + 1));
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// Add inbox as watcher of feed.
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tr.set(keyForFeedWatcher(feed, inbox), StringRef());
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wait(tr.commit());
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break;
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} catch (Error& e) {
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wait(tr.onError(e));
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}
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}
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return true;
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}
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Future<bool> PubSub::createSubscription(uint64_t feed, uint64_t inbox) {
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return _createSubscription(cx, feed, inbox);
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}
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// Since we are not relying on "read-your-own-writes", we need to keep track of
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// the highest-numbered inbox that we've cleared from the watchers list and
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// make sure that further requests start after this inbox.
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ACTOR Future<Void> updateFeedWatchers(Transaction* tr, uint64_t feed) {
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state StringRef watcherPrefix = keyForFeedWatcherPrefix(feed);
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state uint64_t highestInbox;
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state bool first = true;
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loop {
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// Grab watching inboxes in swaths of 100
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state RangeResult watchingInboxes =
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wait((*tr).getRange(firstGreaterOrEqual(keyForFeedWatcher(feed, first ? 0 : highestInbox + 1)),
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firstGreaterOrEqual(keyForFeedWatcher(feed, UINT64_MAX)),
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100)); // REVIEW: does 100 make sense?
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if (!watchingInboxes.size())
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// If there are no watchers, return.
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return Void();
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first = false;
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state int idx = 0;
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for (; idx < watchingInboxes.size(); idx++) {
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KeyRef key = watchingInboxes[idx].key;
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StringRef inboxStr = key.removePrefix(watcherPrefix);
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uint64_t inbox = valueToUInt64(inboxStr);
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// add this feed to the stale list of inbox
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(*tr).set(keyForInboxStaleFeed(inbox, feed), StringRef());
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// remove the inbox from the list of watchers on this feed
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(*tr).clear(key);
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highestInbox = inbox;
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}
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if (watchingInboxes.size() < 100)
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// If there were fewer watchers returned that we asked for, we're done.
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return Void();
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}
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}
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/*
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* Posts a message to a feed. This updates the list of stale feeds to all watchers.
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* Return: a per-feed (non-global) message ID.
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*
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* This needs many additions to make it "real"
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* SOMEDAY: create better global message table to enforce cross-feed ordering.
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* SOMEDAY: create a global "dispatching" list for feeds that have yet to fully update inboxes.
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* Move feed in and remove watchers in one transaction, possibly
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* SOMEDAY: create a global list of the most-subscribed-to feeds that all inbox reads check
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*/
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ACTOR Future<uint64_t> _postMessage(Database cx, uint64_t feed, Standalone<StringRef> data) {
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state Transaction tr(cx);
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state uint64_t messageId = UINT64_MAX - (uint64_t)now();
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TraceEvent("PubSubPost").detail("Feed", feed).detail("Message", messageId);
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loop {
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try {
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Optional<Value> feedValue = wait(tr.get(keyForFeed(feed)));
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if (!feedValue.present()) {
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// No such feed!!
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return uint64_t(0);
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}
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// Get globally latest message, set our ID to that less one
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state RangeResult latestMessage = wait(
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tr.getRange(firstGreaterOrEqual(keyForMessage(0)), firstGreaterOrEqual(keyForMessage(UINT64_MAX)), 1));
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if (!latestMessage.size()) {
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messageId = UINT64_MAX - 1;
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} else {
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StringRef messageStr = latestMessage[0].key.removePrefix(messagePrefix);
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messageId = valueToUInt64(messageStr) - 1;
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}
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tr.set(keyForMessage(messageId), StringRef());
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tr.set(keyForDisptchEntry(messageId), StringRef());
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wait(tr.commit());
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break;
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} catch (Error& e) {
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wait(tr.onError(e));
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}
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}
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tr = Transaction(cx);
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loop {
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try {
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// Record this ID as the "latest message" for a feed
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tr.set(keyForFeedLatestMessage(feed), uInt64ToValue(messageId));
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// Store message in list of feed's messages
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tr.set(keyForFeedMessage(feed, messageId), StringRef());
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// Update the count of message that this feed has published
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Optional<Value> cntValue = wait(tr.get(keyForFeedMessageCount(feed)));
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uint64_t messageCount(valueToUInt64(cntValue.get()) + 1);
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tr.set(keyForFeedMessageCount(feed), uInt64ToValue(messageCount));
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// Go through the list of watching inboxes
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wait(updateFeedWatchers(&tr, feed));
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// Post the real message data; clear the "dispatching" entry
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tr.set(keyForMessage(messageId), data);
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tr.clear(keyForDisptchEntry(messageId));
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wait(tr.commit());
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break;
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} catch (Error& e) {
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wait(tr.onError(e));
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}
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}
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return messageId;
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}
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Future<uint64_t> PubSub::postMessage(uint64_t feed, Standalone<StringRef> data) {
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return _postMessage(cx, feed, data);
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}
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ACTOR Future<int> singlePassInboxCacheUpdate(Database cx, uint64_t inbox, int swath) {
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state Transaction tr(cx);
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loop {
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try {
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// For each stale feed, update cache with latest message id
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state RangeResult staleFeeds =
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wait(tr.getRange(firstGreaterOrEqual(keyForInboxStaleFeed(inbox, 0)),
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firstGreaterOrEqual(keyForInboxStaleFeed(inbox, UINT64_MAX)),
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swath)); // REVIEW: does 100 make sense?
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// printf(" --> stale feeds list size: %d\n", staleFeeds.size());
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if (!staleFeeds.size())
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// If there are no stale feeds, return.
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return 0;
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state StringRef stalePrefix = keyForInboxStalePrefix(inbox);
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state int idx = 0;
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for (; idx < staleFeeds.size(); idx++) {
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StringRef feedStr = staleFeeds[idx].key.removePrefix(stalePrefix);
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// printf(" --> clearing stale entry: %s\n", feedStr.toString().c_str());
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state uint64_t feed = valueToUInt64(feedStr);
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// SOMEDAY: change this to be a range query for the highest #'ed message
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Optional<Value> v = wait(tr.get(keyForFeedLatestMessage(feed)));
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state Value latestMessageValue = v.get();
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// printf(" --> latest message from feed: %s\n", latestMessageValue.toString().c_str());
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// find the messageID which is currently cached for this feed
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Optional<Value> lastCachedValue = wait(tr.get(keyForInboxCacheByFeed(inbox, feed)));
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if (lastCachedValue.present()) {
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uint64_t lastCachedId = valueToUInt64(lastCachedValue.get());
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// clear out the cache entry in the "by-ID" list for this feed
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// SOMEDAY: should we leave this in there in some way, or should we pull a better/more recent cache?
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tr.clear(keyForInboxCacheByID(inbox, lastCachedId));
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}
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// printf(" --> caching message by ID: %s\n", keyForInboxCacheByID(inbox,
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// valueToUInt64(latestMessageValue)).toString().c_str());
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tr.set(keyForInboxCacheByID(inbox, valueToUInt64(latestMessageValue)), uInt64ToValue(feed));
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// set the latest message
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tr.set(keyForInboxCacheByFeed(inbox, feed), latestMessageValue);
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tr.clear(staleFeeds[idx].key);
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// place watch back on feed
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tr.set(keyForFeedWatcher(feed, inbox), StringRef());
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// printf(" --> adding watch to feed: %s\n", keyForFeedWatcher(feed, inbox).toString().c_str());
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}
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wait(tr.commit());
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return staleFeeds.size();
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} catch (Error& e) {
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wait(tr.onError(e));
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}
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}
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}
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// SOMEDAY: evaluate if this could lead to painful loop if there's one frequent feed.
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ACTOR Future<Void> updateInboxCache(Database cx, uint64_t inbox) {
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state int swath = 100;
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state int updatedEntries = swath;
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while (updatedEntries >= swath) {
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int retVal = wait(singlePassInboxCacheUpdate(cx, inbox, swath));
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updatedEntries = retVal;
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}
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return Void();
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}
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ACTOR Future<MessageId> getFeedLatestAtOrAfter(Transaction* tr, Feed feed, MessageId position) {
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state RangeResult lastMessageRange = wait((*tr).getRange(firstGreaterOrEqual(keyForFeedMessage(feed, position)),
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firstGreaterOrEqual(keyForFeedMessage(feed, UINT64_MAX)),
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1));
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if (!lastMessageRange.size())
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return uint64_t(0);
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KeyValueRef m = lastMessageRange[0];
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StringRef prefix = keyForFeedMessagePrefix(feed);
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StringRef mIdStr = m.key.removePrefix(prefix);
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return valueToUInt64(mIdStr);
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}
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ACTOR Future<Message> getMessage(Transaction* tr, Feed feed, MessageId id) {
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state Message m;
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m.originatorFeed = feed;
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m.messageId = id;
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Optional<Value> data = wait(tr->get(keyForMessage(id)));
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m.data = data.get();
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return m;
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}
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ACTOR Future<std::vector<Message>> _listInboxMessages(Database cx, uint64_t inbox, int count, uint64_t cursor);
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// inboxes with MANY fast feeds may be punished by the following checks
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// SOMEDAY: add a check on global lists (or on dispatching list)
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ACTOR Future<std::vector<Message>> _listInboxMessages(Database cx, uint64_t inbox, int count, uint64_t cursor) {
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TraceEvent("PubSubListInbox").detail("Inbox", inbox).detail("Count", count).detail("Cursor", cursor);
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wait(updateInboxCache(cx, inbox));
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state StringRef perIdPrefix = keyForInboxCacheByIDPrefix(inbox);
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loop {
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state Transaction tr(cx);
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state std::vector<Message> messages;
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state std::map<MessageId, Feed> feedLatest;
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try {
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// Fetch all cached entries for all the feeds to which we are subscribed
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Optional<Value> cntValue = wait(tr.get(keyForInboxSubscriptionCount(inbox)));
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uint64_t subscriptions = valueToUInt64(cntValue.get());
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state RangeResult feeds = wait(tr.getRange(firstGreaterOrEqual(keyForInboxCacheByID(inbox, 0)),
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firstGreaterOrEqual(keyForInboxCacheByID(inbox, UINT64_MAX)),
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subscriptions));
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if (!feeds.size())
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return messages;
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// read cache into map, replace entries newer than cursor with the newest older than cursor
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state int idx = 0;
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for (; idx < feeds.size(); idx++) {
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StringRef mIdStr = feeds[idx].key.removePrefix(perIdPrefix);
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MessageId messageId = valueToUInt64(mIdStr);
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state Feed feed = valueToUInt64(feeds[idx].value);
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// printf(" -> cached message %016llx from feed %016llx\n", messageId, feed);
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if (messageId >= cursor) {
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// printf(" -> entering message %016llx from feed %016llx\n", messageId, feed);
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feedLatest.emplace(messageId, feed);
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} else {
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// replace this with the first message older than the cursor
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MessageId mId = wait(getFeedLatestAtOrAfter(&tr, feed, cursor));
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if (mId) {
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feedLatest.emplace(mId, feed);
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}
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}
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}
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// There were some cached feeds, but none with messages older than "cursor"
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if (!feedLatest.size())
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return messages;
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// Check the list of dispatching messages to make sure there are no older ones than ours
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state MessageId earliestMessage = feedLatest.begin()->first;
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RangeResult dispatching = wait(tr.getRange(firstGreaterOrEqual(keyForDisptchEntry(earliestMessage)),
|
|
firstGreaterOrEqual(keyForDisptchEntry(UINT64_MAX)),
|
|
1));
|
|
// If there are messages "older" than ours, try this again
|
|
// (with a new transaction and a flush of the "stale" feeds
|
|
if (dispatching.size()) {
|
|
std::vector<Message> r = wait(_listInboxMessages(cx, inbox, count, earliestMessage));
|
|
return r;
|
|
}
|
|
|
|
while (messages.size() < count && feedLatest.size() > 0) {
|
|
std::map<MessageId, Feed>::iterator latest = feedLatest.begin();
|
|
state MessageId id = latest->first;
|
|
state Feed f = latest->second;
|
|
feedLatest.erase(latest);
|
|
|
|
Message m = wait(getMessage(&tr, f, id));
|
|
messages.push_back(m);
|
|
|
|
MessageId nextMessage = wait(getFeedLatestAtOrAfter(&tr, f, id + 1));
|
|
if (nextMessage) {
|
|
feedLatest.emplace(nextMessage, f);
|
|
}
|
|
}
|
|
|
|
return messages;
|
|
} catch (Error& e) {
|
|
wait(tr.onError(e));
|
|
}
|
|
}
|
|
}
|
|
|
|
Future<std::vector<Message>> PubSub::listInboxMessages(uint64_t inbox, int count, uint64_t cursor) {
|
|
return _listInboxMessages(cx, inbox, count, cursor);
|
|
}
|
|
|
|
ACTOR Future<std::vector<Message>> _listFeedMessages(Database cx, Feed feed, int count, uint64_t cursor) {
|
|
state std::vector<Message> messages;
|
|
state Transaction tr(cx);
|
|
TraceEvent("PubSubListFeed").detail("Feed", feed).detail("Count", count).detail("Cursor", cursor);
|
|
loop {
|
|
try {
|
|
state RangeResult messageIds = wait(tr.getRange(firstGreaterOrEqual(keyForFeedMessage(feed, cursor)),
|
|
firstGreaterOrEqual(keyForFeedMessage(feed, UINT64_MAX)),
|
|
count));
|
|
if (!messageIds.size())
|
|
return messages;
|
|
|
|
state int idx = 0;
|
|
for (; idx < messageIds.size(); idx++) {
|
|
StringRef mIdStr = messageIds[idx].key.removePrefix(keyForFeedMessagePrefix(feed));
|
|
MessageId messageId = valueToUInt64(mIdStr);
|
|
Message m = wait(getMessage(&tr, feed, messageId));
|
|
messages.push_back(m);
|
|
}
|
|
return messages;
|
|
} catch (Error& e) {
|
|
wait(tr.onError(e));
|
|
}
|
|
}
|
|
}
|
|
|
|
Future<std::vector<Message>> PubSub::listFeedMessages(Feed feed, int count, uint64_t cursor) {
|
|
return _listFeedMessages(cx, feed, count, cursor);
|
|
}
|