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Preallocate response string in JSON interface.

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GitOrigin-RevId: 73ab96ad95a46469e9afc59f02b48c8932457ef0
This commit is contained in:
levlam 2020-10-30 01:02:44 +03:00
parent 86c80e652e
commit 979a1997d5
1 changed files with 10 additions and 7 deletions
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17
td/telegram/ClientJson.cpp
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@ -13,6 +13,7 @@
#include "td/utils/JsonBuilder.h"
#include "td/utils/logging.h"
#include "td/utils/port/thread_local.h"
#include "td/utils/StackAllocator.h"
#include "td/utils/StringBuilder.h"
#include <utility>
@ -54,21 +55,23 @@ static std::pair<td_api::object_ptr<td_api::Function>, string> to_request(Slice
}
static string from_response(const td_api::Object &object, const string &extra, int client_id) {
auto str = json_encode<string>(ToJson(object));
CHECK(!str.empty() && str.back() == '}');
str.reserve(str.size() + (extra.empty() ? 0 : 10 + extra.size()) + (client_id == 0 ? 0 : 14 + 10));
auto buf = StackAllocator::alloc(1 << 18);
JsonBuilder jb(StringBuilder(buf.as_slice(), true), -1);
jb.enter_value() << ToJson(object);
auto slice = jb.string_builder().as_cslice();
CHECK(!slice.empty() && slice.back() == '}');
string str;
str.reserve(slice.size() + (extra.empty() ? 0 : 10 + extra.size()) + (client_id == 0 ? 0 : 14 + 10));
str.append(slice.begin(), slice.size() - 1);
if (!extra.empty()) {
str.pop_back();
str += ",\"@extra\":";
str += extra;
str += '}';
}
if (client_id != 0) {
str.pop_back();
str += ",\"@client_id\":";
str += to_string(client_id);
str += '}';
}
str += '}';
return str;
}