113 lines
3.4 KiB
C++
113 lines
3.4 KiB
C++
/*
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* TagThrottle.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 2013-2020 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 "fdbclient/TagThrottle.actor.h"
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#include "fdbclient/CommitProxyInterface.h"
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#include "fdbclient/DatabaseContext.h"
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#include "flow/actorcompiler.h" // has to be last include
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void TagSet::addTag(TransactionTagRef tag) {
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ASSERT(CLIENT_KNOBS->MAX_TRANSACTION_TAG_LENGTH < 256); // Tag length is encoded with a single byte
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ASSERT(CLIENT_KNOBS->MAX_TAGS_PER_TRANSACTION < 256); // Number of tags is encoded with a single byte
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if (tag.size() > CLIENT_KNOBS->MAX_TRANSACTION_TAG_LENGTH) {
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throw tag_too_long();
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}
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if (tags.size() >= CLIENT_KNOBS->MAX_TAGS_PER_TRANSACTION) {
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throw too_many_tags();
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}
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TransactionTagRef tagRef(arena, tag);
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auto it = find(tags.begin(), tags.end(), tagRef);
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if (it == tags.end()) {
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tags.push_back(std::move(tagRef));
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bytes += tag.size();
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}
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}
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size_t TagSet::size() const {
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return tags.size();
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}
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// Format for throttle key:
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//
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// tagThrottleKeysPrefix + [auto-throttled (1-byte 0/1)] + [priority (1-byte)] + [tag list]
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// tag list consists of 1 or more consecutive tags, each encoded as:
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// tag.size() (1 byte) + tag's bytes. For example, tag 'foo' is: \x03foo
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// The tags are listed in sorted order
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//
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// Currently, the throttle API supports only 1 tag per throttle
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Key TagThrottleKey::toKey() const {
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ASSERT(CLIENT_KNOBS->MAX_TRANSACTION_TAG_LENGTH < 256);
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ASSERT(tags.size() > 0);
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ASSERT(tags.size() == 1); // SOMEDAY: support multiple tags per throttle
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int size = tagThrottleKeysPrefix.size() + tags.size() + 2;
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for (auto tag : tags) {
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ASSERT(tag.size() <= CLIENT_KNOBS->MAX_TRANSACTION_TAG_LENGTH);
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size += tag.size();
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}
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Key result;
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uint8_t* str = new (result.arena()) uint8_t[size];
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result.contents() = StringRef(str, size);
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memcpy(str, tagThrottleKeysPrefix.begin(), tagThrottleKeysPrefix.size());
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str += tagThrottleKeysPrefix.size();
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*(str++) = (uint8_t)throttleType;
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*(str++) = (uint8_t)priority;
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for (auto tag : tags) {
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*(str++) = (uint8_t)tag.size();
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if (tag.size() > 0) {
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memcpy(str, tag.begin(), tag.size());
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str += tag.size();
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}
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}
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return result;
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}
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TagThrottleKey TagThrottleKey::fromKey(const KeyRef& key) {
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const uint8_t* str = key.substr(tagThrottleKeysPrefix.size()).begin();
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TagThrottleType throttleType = TagThrottleType(*(str++));
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TransactionPriority priority = TransactionPriority(*(str++));
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TagSet tags;
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while (str < key.end()) {
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uint8_t size = *(str++);
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tags.addTag(TransactionTagRef(str, size));
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str += size;
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}
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return TagThrottleKey(tags, throttleType, priority);
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}
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TagThrottleValue TagThrottleValue::fromValue(const ValueRef& value) {
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TagThrottleValue throttleValue;
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BinaryReader reader(value, IncludeVersion(ProtocolVersion::withTagThrottleValueReason()));
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reader >> throttleValue;
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return throttleValue;
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}
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