275 lines
13 KiB
C++
275 lines
13 KiB
C++
/*
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* S3BlobStore.h
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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 2013-2018 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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#pragma once
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#include <map>
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#include <functional>
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#include "flow/flow.h"
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#include "flow/Net2Packet.h"
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#include "fdbclient/Knobs.h"
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#include "fdbrpc/IRateControl.h"
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#include "fdbclient/HTTP.h"
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#include "fdbclient/JSONDoc.h"
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// Representation of all the things you need to connect to a blob store instance with some credentials.
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// Reference counted because a very large number of them could be needed.
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class S3BlobStoreEndpoint : public ReferenceCounted<S3BlobStoreEndpoint> {
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public:
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struct Stats {
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Stats() : requests_successful(0), requests_failed(0), bytes_sent(0) {}
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Stats operator-(const Stats& rhs);
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void clear() { memset(this, 0, sizeof(*this)); }
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json_spirit::mObject getJSON();
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int64_t requests_successful;
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int64_t requests_failed;
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int64_t bytes_sent;
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};
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static Stats s_stats;
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struct BlobKnobs {
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BlobKnobs();
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int secure_connection, connect_tries, connect_timeout, max_connection_life, request_tries, request_timeout_min,
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requests_per_second, list_requests_per_second, write_requests_per_second, read_requests_per_second,
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delete_requests_per_second, multipart_max_part_size, multipart_min_part_size, concurrent_requests,
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concurrent_uploads, concurrent_lists, concurrent_reads_per_file, concurrent_writes_per_file,
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read_block_size, read_ahead_blocks, read_cache_blocks_per_file, max_send_bytes_per_second,
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max_recv_bytes_per_second;
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bool set(StringRef name, int value);
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std::string getURLParameters() const;
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static std::vector<std::string> getKnobDescriptions() {
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return {
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"secure_connection (or sc) Set 1 for secure connection and 0 for insecure connection.",
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"connect_tries (or ct) Number of times to try to connect for each request.",
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"connect_timeout (or cto) Number of seconds to wait for a connect request to succeed.",
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"max_connection_life (or mcl) Maximum number of seconds to use a single TCP connection.",
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"request_tries (or rt) Number of times to try each request until a parseable HTTP "
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"response other than 429 is received.",
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"request_timeout_min (or rtom) Number of seconds to wait for a request to succeed after a "
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"connection is established.",
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"requests_per_second (or rps) Max number of requests to start per second.",
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"list_requests_per_second (or lrps) Max number of list requests to start per second.",
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"write_requests_per_second (or wrps) Max number of write requests to start per second.",
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"read_requests_per_second (or rrps) Max number of read requests to start per second.",
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"delete_requests_per_second (or drps) Max number of delete requests to start per second.",
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"multipart_max_part_size (or maxps) Max part size for multipart uploads.",
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"multipart_min_part_size (or minps) Min part size for multipart uploads.",
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"concurrent_requests (or cr) Max number of total requests in progress at once, regardless of "
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"operation-specific concurrency limits.",
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"concurrent_uploads (or cu) Max concurrent uploads (part or whole) that can be in progress "
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"at once.",
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"concurrent_lists (or cl) Max concurrent list operations that can be in progress at once.",
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"concurrent_reads_per_file (or crps) Max concurrent reads in progress for any one file.",
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"concurrent_writes_per_file (or cwps) Max concurrent uploads in progress for any one file.",
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"read_block_size (or rbs) Block size in bytes to be used for reads.",
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"read_ahead_blocks (or rab) Number of blocks to read ahead of requested offset.",
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"read_cache_blocks_per_file (or rcb) Size of the read cache for a file in blocks.",
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"max_send_bytes_per_second (or sbps) Max send bytes per second for all requests combined.",
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"max_recv_bytes_per_second (or rbps) Max receive bytes per second for all requests combined (NOT YET "
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"USED)."
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};
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}
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};
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S3BlobStoreEndpoint(std::string const& host,
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std::string service,
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std::string const& key,
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std::string const& secret,
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BlobKnobs const& knobs = BlobKnobs(),
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HTTP::Headers extraHeaders = HTTP::Headers())
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: host(host), service(service), key(key), secret(secret), lookupSecret(secret.empty()), knobs(knobs),
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extraHeaders(extraHeaders), requestRate(new SpeedLimit(knobs.requests_per_second, 1)),
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requestRateList(new SpeedLimit(knobs.list_requests_per_second, 1)),
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requestRateWrite(new SpeedLimit(knobs.write_requests_per_second, 1)),
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requestRateRead(new SpeedLimit(knobs.read_requests_per_second, 1)),
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requestRateDelete(new SpeedLimit(knobs.delete_requests_per_second, 1)),
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sendRate(new SpeedLimit(knobs.max_send_bytes_per_second, 1)),
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recvRate(new SpeedLimit(knobs.max_recv_bytes_per_second, 1)), concurrentRequests(knobs.concurrent_requests),
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concurrentUploads(knobs.concurrent_uploads), concurrentLists(knobs.concurrent_lists) {
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if (host.empty())
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throw connection_string_invalid();
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}
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static std::string getURLFormat(bool withResource = false) {
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const char* resource = "";
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if (withResource)
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resource = "<name>";
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return format("blobstore://<api_key>:<secret>@<host>[:<port>]/%s[?<param>=<value>[&<param>=<value>]...]",
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resource);
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}
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typedef std::map<std::string, std::string> ParametersT;
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// Parse url and return a S3BlobStoreEndpoint
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// If the url has parameters that S3BlobStoreEndpoint can't consume then an error will be thrown unless
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// ignored_parameters is given in which case the unconsumed parameters will be added to it.
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static Reference<S3BlobStoreEndpoint> fromString(std::string const& url,
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std::string* resourceFromURL = nullptr,
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std::string* error = nullptr,
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ParametersT* ignored_parameters = nullptr);
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// Get a normalized version of this URL with the given resource and any non-default BlobKnob values as URL
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// parameters in addition to the passed params string
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std::string getResourceURL(std::string resource, std::string params) const;
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struct ReusableConnection {
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Reference<IConnection> conn;
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double expirationTime;
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};
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std::queue<ReusableConnection> connectionPool;
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Future<ReusableConnection> connect();
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void returnConnection(ReusableConnection& conn);
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std::string host;
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std::string service;
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std::string key;
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std::string secret;
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bool lookupSecret;
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BlobKnobs knobs;
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HTTP::Headers extraHeaders;
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// Speed and concurrency limits
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Reference<IRateControl> requestRate;
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Reference<IRateControl> requestRateList;
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Reference<IRateControl> requestRateWrite;
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Reference<IRateControl> requestRateRead;
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Reference<IRateControl> requestRateDelete;
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Reference<IRateControl> sendRate;
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Reference<IRateControl> recvRate;
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FlowLock concurrentRequests;
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FlowLock concurrentUploads;
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FlowLock concurrentLists;
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Future<Void> updateSecret();
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// Calculates the authentication string from the secret key
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std::string hmac_sha1(std::string const& msg);
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// Sets headers needed for Authorization (including Date which will be overwritten if present)
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void setAuthHeaders(std::string const& verb, std::string const& resource, HTTP::Headers& headers);
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// Prepend the HTTP request header to the given PacketBuffer, returning the new head of the buffer chain
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static PacketBuffer* writeRequestHeader(std::string const& request,
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HTTP::Headers const& headers,
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PacketBuffer* dest);
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// Do an HTTP request to the Blob Store, read the response. Handles authentication.
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// Every blob store interaction should ultimately go through this function
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Future<Reference<HTTP::Response>> doRequest(std::string const& verb,
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std::string const& resource,
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const HTTP::Headers& headers,
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UnsentPacketQueue* pContent,
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int contentLen,
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std::set<unsigned int> successCodes);
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struct ObjectInfo {
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std::string name;
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int64_t size;
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};
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struct ListResult {
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std::vector<std::string> commonPrefixes;
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std::vector<ObjectInfo> objects;
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};
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// Get bucket contents via a stream, since listing large buckets will take many serial blob requests
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// If a delimiter is passed then common prefixes will be read in parallel, recursively, depending on recurseFilter.
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// Recursefilter is a must be a function that takes a string and returns true if it passes. The default behavior is
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// to assume true.
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Future<Void> listObjectsStream(std::string const& bucket,
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PromiseStream<ListResult> results,
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Optional<std::string> prefix = {},
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Optional<char> delimiter = {},
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int maxDepth = 0,
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std::function<bool(std::string const&)> recurseFilter = nullptr);
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// Get a list of the files in a bucket, see listObjectsStream for more argument detail.
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Future<ListResult> listObjects(std::string const& bucket,
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Optional<std::string> prefix = {},
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Optional<char> delimiter = {},
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int maxDepth = 0,
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std::function<bool(std::string const&)> recurseFilter = nullptr);
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// Get a list of all buckets
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Future<std::vector<std::string>> listBuckets();
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// Check if a bucket exists
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Future<bool> bucketExists(std::string const& bucket);
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// Check if an object exists in a bucket
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Future<bool> objectExists(std::string const& bucket, std::string const& object);
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// Get the size of an object in a bucket
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Future<int64_t> objectSize(std::string const& bucket, std::string const& object);
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// Read an arbitrary segment of an object
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Future<int> readObject(std::string const& bucket,
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std::string const& object,
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void* data,
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int length,
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int64_t offset);
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// Delete an object in a bucket
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Future<Void> deleteObject(std::string const& bucket, std::string const& object);
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// Delete all objects in a bucket under a prefix. Note this is not atomic as blob store does not
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// support this operation directly. This method is just a convenience method that lists and deletes
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// all of the objects in the bucket under the given prefix.
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// Since it can take a while, if a pNumDeleted and/or pBytesDeleted are provided they will be incremented every time
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// a deletion of an object completes.
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Future<Void> deleteRecursively(std::string const& bucket,
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std::string prefix = "",
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int* pNumDeleted = nullptr,
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int64_t* pBytesDeleted = nullptr);
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// Create a bucket if it does not already exists.
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Future<Void> createBucket(std::string const& bucket);
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// Useful methods for working with tiny files
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Future<std::string> readEntireFile(std::string const& bucket, std::string const& object);
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Future<Void> writeEntireFile(std::string const& bucket, std::string const& object, std::string const& content);
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Future<Void> writeEntireFileFromBuffer(std::string const& bucket,
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std::string const& object,
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UnsentPacketQueue* pContent,
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int contentLen,
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std::string const& contentMD5);
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// MultiPart upload methods
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// Returns UploadID
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Future<std::string> beginMultiPartUpload(std::string const& bucket, std::string const& object);
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// Returns eTag
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Future<std::string> uploadPart(std::string const& bucket,
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std::string const& object,
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std::string const& uploadID,
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unsigned int partNumber,
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UnsentPacketQueue* pContent,
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int contentLen,
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std::string const& contentMD5);
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typedef std::map<int, std::string> MultiPartSetT;
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Future<Void> finishMultiPartUpload(std::string const& bucket,
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std::string const& object,
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std::string const& uploadID,
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MultiPartSetT const& parts);
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};
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