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https://github.com/scylladb/scylladb.git
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7640ade04d
The method connects a socket, grabs in/out streams from it then writes HTTP request and reads+parses the response. For that it uses class variables for socket and streams, but there's no real need for that -- all three actually exists throughput the method "lifetime". To fix it, coroutinizes the method. The same could be achieved my moving the connected socket and streams into do_with() context, but coroutine is better than that. (indentation is left broken) Signed-off-by: Pavel Emelyanov <xemul@scylladb.com>
39 lines
1.4 KiB
C++
39 lines
1.4 KiB
C++
/*
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* SPDX-License-Identifier: Apache-2.0
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*
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* Modified by ScyllaDB
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* Copyright (C) 2015-present ScyllaDB
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*/
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#pragma once
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#include "locator/production_snitch_base.hh"
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#include <seastar/http/response_parser.hh>
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#include <seastar/net/api.hh>
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#include "utils/exponential_backoff_retry.hh"
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namespace locator {
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class ec2_snitch : public production_snitch_base {
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public:
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static constexpr const char* TOKEN_REQ_ENDPOINT = "/latest/api/token";
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static constexpr const char* ZONE_NAME_QUERY_REQ = "/latest/meta-data/placement/availability-zone";
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static constexpr const char* AWS_QUERY_SERVER_ADDR = "169.254.169.254";
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static constexpr uint16_t AWS_QUERY_SERVER_PORT = 80;
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static constexpr int AWS_API_CALL_RETRIES = 10;
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ec2_snitch(const snitch_config&);
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virtual future<> start() override;
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virtual sstring get_name() const override {
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return "org.apache.cassandra.locator.Ec2Snitch";
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}
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protected:
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future<> load_config(bool prefer_local);
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future<sstring> aws_api_call(sstring addr, uint16_t port, const sstring cmd, std::optional<sstring> token);
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future<sstring> read_property_file();
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private:
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http_response_parser _parser;
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sstring _req;
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exponential_backoff_retry _ec2_api_retry = exponential_backoff_retry(std::chrono::seconds(5), std::chrono::seconds(2560));
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future<sstring> aws_api_call_once(sstring addr, uint16_t port, const sstring cmd, std::optional<sstring> token);
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};
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} // namespace locator
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