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1 | /* |
2 | * This file is part of PowerDNS or dnsdist. | |
3 | * Copyright -- PowerDNS.COM B.V. and its contributors | |
4 | * | |
5 | * This program is free software; you can redistribute it and/or modify | |
6 | * it under the terms of version 2 of the GNU General Public License as | |
7 | * published by the Free Software Foundation. | |
8 | * | |
9 | * In addition, for the avoidance of any doubt, permission is granted to | |
10 | * link this program with OpenSSL and to (re)distribute the binaries | |
11 | * produced as the result of such linking. | |
12 | * | |
13 | * This program is distributed in the hope that it will be useful, | |
14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | * GNU General Public License for more details. | |
17 | * | |
18 | * You should have received a copy of the GNU General Public License | |
19 | * along with this program; if not, write to the Free Software | |
20 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. | |
21 | */ | |
22 | #pragma once | |
23 | ||
24 | struct dnsdist_ffi_servers_list_t; | |
25 | struct dnsdist_ffi_server_t; | |
26 | struct dnsdist_ffi_dnsquestion_t; | |
27 | ||
28 | struct DownstreamState; | |
29 | ||
30 | struct ServerPolicy | |
31 | { | |
32 | template <class T> using NumberedVector = std::vector<std::pair<unsigned int, T> >; | |
33 | using NumberedServerVector = NumberedVector<shared_ptr<DownstreamState>>; | |
34 | typedef std::function<shared_ptr<DownstreamState>(const NumberedServerVector& servers, const DNSQuestion*)> policyfunc_t; | |
35 | typedef std::function<unsigned int(dnsdist_ffi_servers_list_t* servers, dnsdist_ffi_dnsquestion_t* dq)> ffipolicyfunc_t; | |
36 | ||
37 | ServerPolicy(const std::string& name_, policyfunc_t policy_, bool isLua_): name(name_), policy(policy_), isLua(isLua_) | |
38 | { | |
39 | } | |
40 | ServerPolicy(const std::string& name_, ffipolicyfunc_t policy_): name(name_), ffipolicy(policy_), isLua(true), isFFI(true) | |
41 | { | |
42 | } | |
43 | ServerPolicy() | |
44 | { | |
45 | } | |
46 | ||
47 | string name; | |
48 | policyfunc_t policy; | |
49 | ffipolicyfunc_t ffipolicy; | |
50 | bool isLua{false}; | |
51 | bool isFFI{false}; | |
52 | ||
53 | std::string toString() const { | |
54 | return string("ServerPolicy") + (isLua ? " (Lua)" : "") + " \"" + name + "\""; | |
55 | } | |
56 | }; | |
57 | ||
58 | struct ServerPool; | |
59 | ||
60 | using pools_t=map<std::string,std::shared_ptr<ServerPool>>; | |
61 | std::shared_ptr<ServerPool> getPool(const pools_t& pools, const std::string& poolName); | |
62 | std::shared_ptr<ServerPool> createPoolIfNotExists(pools_t& pools, const string& poolName); | |
63 | void setPoolPolicy(pools_t& pools, const string& poolName, std::shared_ptr<ServerPolicy> policy); | |
64 | void addServerToPool(pools_t& pools, const string& poolName, std::shared_ptr<DownstreamState> server); | |
65 | void removeServerFromPool(pools_t& pools, const string& poolName, std::shared_ptr<DownstreamState> server); | |
66 | ||
67 | ServerPolicy::NumberedServerVector getDownstreamCandidates(const map<std::string,std::shared_ptr<ServerPool>>& pools, const std::string& poolName); | |
68 | ||
69 | std::shared_ptr<DownstreamState> firstAvailable(const ServerPolicy::NumberedServerVector& servers, const DNSQuestion* dq); | |
70 | ||
71 | std::shared_ptr<DownstreamState> leastOutstanding(const ServerPolicy::NumberedServerVector& servers, const DNSQuestion* dq); | |
72 | std::shared_ptr<DownstreamState> wrandom(const ServerPolicy::NumberedServerVector& servers, const DNSQuestion* dq); | |
73 | std::shared_ptr<DownstreamState> whashed(const ServerPolicy::NumberedServerVector& servers, const DNSQuestion* dq); | |
cc958b79 | 74 | std::shared_ptr<DownstreamState> whashedFromHash(const ServerPolicy::NumberedServerVector& servers, size_t hash); |
b6e26895 | 75 | std::shared_ptr<DownstreamState> chashed(const ServerPolicy::NumberedServerVector& servers, const DNSQuestion* dq); |
cc958b79 | 76 | std::shared_ptr<DownstreamState> chashedFromHash(const ServerPolicy::NumberedServerVector& servers, size_t hash); |
b6e26895 | 77 | std::shared_ptr<DownstreamState> roundrobin(const ServerPolicy::NumberedServerVector& servers, const DNSQuestion* dq); |
a9599e73 | 78 | std::shared_ptr<DownstreamState> getSelectedBackendFromPolicy(const ServerPolicy& policy, const ServerPolicy::NumberedServerVector& servers, DNSQuestion& dq); |
439de524 RG |
79 | |
80 | extern double g_consistentHashBalancingFactor; | |
81 | extern double g_weightedBalancingFactor; | |
82 | extern uint32_t g_hashperturb; | |
83 | extern bool g_roundrobinFailOnNoServer; |