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Improve performance by removing MD5 for check cache keys #2002
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,77 @@ | ||
| /* Copyright 2017 Istio Authors. All Rights Reserved. | ||
| * | ||
| * Licensed under the Apache License, Version 2.0 (the "License"); | ||
| * you may not use this file except in compliance with the License. | ||
| * You may obtain a copy of the License at | ||
| * | ||
| * http://www.apache.org/licenses/LICENSE-2.0 | ||
| * | ||
| * Unless required by applicable law or agreed to in writing, software | ||
| * distributed under the License is distributed on an "AS IS" BASIS, | ||
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| * See the License for the specific language governing permissions and | ||
| * limitations under the License. | ||
| */ | ||
|
|
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| #ifndef ISTIO_UTILS_CONCAT_HASH_H_ | ||
| #define ISTIO_UTILS_CONCAT_HASH_H_ | ||
|
|
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| #include <string.h> | ||
| #include <string> | ||
|
|
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| namespace istio { | ||
| namespace utils { | ||
|
|
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| // This class concatenates multiple values into a string as hash | ||
| class ConcatHash { | ||
| public: | ||
| ConcatHash(size_t reserve_size) { hash_.reserve(reserve_size); } | ||
|
|
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| // Updates the context with data. | ||
| ConcatHash& Update(const void* data, size_t size) { | ||
| hash_.append(static_cast<const char*>(data), size); | ||
| return *this; | ||
| } | ||
|
|
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| // A helper function for int | ||
| ConcatHash& Update(int d) { return Update(&d, sizeof(d)); } | ||
|
|
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| // A helper function for const char* | ||
| ConcatHash& Update(const char* str) { | ||
| hash_.append(str); | ||
| return *this; | ||
| } | ||
|
|
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| // A helper function for const string | ||
| ConcatHash& Update(const std::string& str) { | ||
| hash_.append(str); | ||
| return *this; | ||
| } | ||
|
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| // Returns the concated string as hash. | ||
| std::string getHash() const { return hash_; } | ||
|
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| // Converts a binary string to a printable string for unit-test only | ||
| static std::string DebugString(const std::string& hash) { | ||
| std::string out; | ||
| out.reserve(hash.size() * 2); | ||
| for (auto c : hash) { | ||
| if (std::isprint(c)) { | ||
| out.append(1, c); | ||
| } else { | ||
| char buf[10]; | ||
| sprintf(buf, "%02x", (unsigned char)c); | ||
| out.append(buf); | ||
| } | ||
| } | ||
| return out; | ||
| } | ||
|
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| private: | ||
| std::string hash_; | ||
| }; | ||
|
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| } // namespace utils | ||
| } // namespace istio | ||
|
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| #endif // ISTIO_UTILS_CONCAT_HASH_H_ | ||
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I think you can consolidate 3 of Update with string_view.