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062e2281 | 1 | /* |
f6e9a3ee | 2 | * Copyright (C) 1996-2019 The Squid Software Foundation and contributors |
e25c139f | 3 | * |
bbc27441 AJ |
4 | * Squid software is distributed under GPLv2+ license and includes |
5 | * contributions from numerous individuals and organizations. | |
6 | * Please see the COPYING and CONTRIBUTORS files for details. | |
062e2281 | 7 | */ |
8 | ||
bbc27441 AJ |
9 | /* DEBUG: section 44 Peer Selection Algorithm */ |
10 | ||
582c2af2 FC |
11 | #include "squid.h" |
12 | #include "acl/FilledChecklist.h" | |
6043e368 | 13 | #include "base/InstanceId.h" |
a011edee | 14 | #include "CachePeer.h" |
21c22f04 | 15 | #include "carp.h" |
582c2af2 | 16 | #include "client_side.h" |
4a3b98d7 | 17 | #include "dns/LookupDetails.h" |
a37fdd8a | 18 | #include "errorpage.h" |
a553a5a3 | 19 | #include "event.h" |
eb13c21e | 20 | #include "FwdState.h" |
af69c635 | 21 | #include "globals.h" |
bbaf2685 | 22 | #include "hier_code.h" |
924f73bc | 23 | #include "htcp.h" |
d3dddfb5 | 24 | #include "http/Stream.h" |
582c2af2 | 25 | #include "HttpRequest.h" |
9b5c4a9a | 26 | #include "icmp/net_db.h" |
582c2af2 | 27 | #include "ICP.h" |
c7a52e6d | 28 | #include "ip/tools.h" |
602d9612 | 29 | #include "ipcache.h" |
f0ba2534 | 30 | #include "neighbors.h" |
f795b373 | 31 | #include "peer_sourcehash.h" |
37236ba1 | 32 | #include "peer_userhash.h" |
582c2af2 | 33 | #include "PeerSelectState.h" |
4d5904f7 | 34 | #include "SquidConfig.h" |
582c2af2 FC |
35 | #include "SquidTime.h" |
36 | #include "Store.h" | |
062e2281 | 37 | |
6043e368 AR |
38 | /** |
39 | * A CachePeer which has been selected as a possible destination. | |
40 | * Listed as pointers here so as to prevent duplicates being added but will | |
41 | * be converted to a set of IP address path options before handing back out | |
42 | * to the caller. | |
43 | * | |
44 | * Certain connection flags and outgoing settings will also be looked up and | |
45 | * set based on the received request and CachePeer settings before handing back. | |
46 | */ | |
47 | class FwdServer | |
48 | { | |
49 | MEMPROXY_CLASS(FwdServer); | |
50 | ||
51 | public: | |
52 | FwdServer(CachePeer *p, hier_code c) : | |
53 | _peer(p), | |
54 | code(c), | |
55 | next(nullptr) | |
56 | {} | |
57 | ||
58 | CbcPointer<CachePeer> _peer; /* NULL --> origin server */ | |
59 | hier_code code; | |
60 | FwdServer *next; | |
61 | }; | |
62 | ||
26ac0430 | 63 | static struct { |
75e88d56 | 64 | int timeouts; |
2fadd50d | 65 | } PeerStats; |
062e2281 | 66 | |
26ac0430 AJ |
67 | static const char *DirectStr[] = { |
68 | "DIRECT_UNKNOWN", | |
69 | "DIRECT_NO", | |
70 | "DIRECT_MAYBE", | |
71 | "DIRECT_YES" | |
72 | }; | |
75e88d56 | 73 | |
e7b08eec AR |
74 | /// a helper class to report a selected destination (for debugging) |
75 | class PeerSelectionDumper | |
76 | { | |
77 | public: | |
cb835136 AR |
78 | PeerSelectionDumper(const PeerSelector * const aSelector, const CachePeer * const aPeer, const hier_code aCode): |
79 | selector(aSelector), peer(aPeer), code(aCode) {} | |
e7b08eec | 80 | |
cb835136 | 81 | const PeerSelector * const selector; ///< selection parameters |
e7b08eec AR |
82 | const CachePeer * const peer; ///< successful selection info |
83 | const hier_code code; ///< selection algorithm | |
84 | }; | |
85 | ||
cb835136 | 86 | CBDATA_CLASS_INIT(PeerSelector); |
aa839030 | 87 | |
e7b08eec AR |
88 | /// prints PeerSelectionDumper (for debugging) |
89 | static std::ostream & | |
90 | operator <<(std::ostream &os, const PeerSelectionDumper &fsd) | |
91 | { | |
92 | os << hier_code_str[fsd.code]; | |
93 | ||
94 | if (fsd.peer) | |
95 | os << '/' << fsd.peer->host; | |
cb835136 AR |
96 | else if (fsd.selector) // useful for DIRECT and gone PINNED destinations |
97 | os << '#' << fsd.selector->request->url.host(); | |
e7b08eec AR |
98 | |
99 | return os; | |
100 | } | |
101 | ||
cb835136 | 102 | PeerSelector::~PeerSelector() |
348b2031 | 103 | { |
36339742 AJ |
104 | while (servers) { |
105 | FwdServer *next = servers->next; | |
3c670b50 | 106 | delete servers; |
36339742 AJ |
107 | servers = next; |
108 | } | |
109 | ||
029c8349 AJ |
110 | if (entry) { |
111 | debugs(44, 3, entry->url()); | |
5ae21d99 | 112 | |
029c8349 | 113 | if (entry->ping_status == PING_WAITING) |
cb835136 | 114 | eventDelete(HandlePingTimeout, this); |
5ae21d99 | 115 | |
029c8349 | 116 | entry->ping_status = PING_DONE; |
5ae21d99 AJ |
117 | } |
118 | ||
029c8349 | 119 | if (acl_checklist) { |
cb835136 | 120 | debugs(44, DBG_IMPORTANT, "BUG: peer selector gone while waiting for a slow ACL"); |
029c8349 | 121 | delete acl_checklist; |
348b2031 | 122 | } |
62e76326 | 123 | |
029c8349 | 124 | HTTPMSGUNLOCK(request); |
62e76326 | 125 | |
029c8349 AJ |
126 | if (entry) { |
127 | assert(entry->ping_status != PING_WAITING); | |
1f90fd4a | 128 | entry->unlock("peerSelect"); |
029c8349 | 129 | entry = NULL; |
73a201f8 | 130 | } |
62e76326 | 131 | |
029c8349 | 132 | delete lastError; |
348b2031 | 133 | } |
062e2281 | 134 | |
2d72d4fd | 135 | static int |
cb365059 | 136 | peerSelectIcpPing(PeerSelector *ps, int direct, StoreEntry * entry) |
062e2281 | 137 | { |
cb365059 EB |
138 | assert(ps); |
139 | HttpRequest *request = ps->request; | |
140 | ||
7b665aeb | 141 | int n; |
db1cd23c | 142 | assert(entry); |
143 | assert(entry->ping_status == PING_NONE); | |
9bd6a36d | 144 | assert(direct != DIRECT_YES); |
cb835136 | 145 | debugs(44, 3, entry->url()); |
62e76326 | 146 | |
45e5102d | 147 | if (!request->flags.hierarchical && direct != DIRECT_NO) |
62e76326 | 148 | return 0; |
149 | ||
d46a87a8 | 150 | if (EBIT_TEST(entry->flags, KEY_PRIVATE) && !neighbors_do_private_keys) |
62e76326 | 151 | if (direct != DIRECT_NO) |
152 | return 0; | |
153 | ||
cb365059 | 154 | n = neighborsCount(ps); |
62e76326 | 155 | |
cb835136 | 156 | debugs(44, 3, "counted " << n << " neighbors"); |
62e76326 | 157 | |
7b665aeb | 158 | return n; |
062e2281 | 159 | } |
160 | ||
6043e368 AR |
161 | static void |
162 | peerSelect(PeerSelectionInitiator *initiator, | |
cfd66529 | 163 | HttpRequest * request, |
d4806c91 | 164 | AccessLogEntry::Pointer const &al, |
6043e368 | 165 | StoreEntry * entry) |
75e88d56 | 166 | { |
86b389fc | 167 | if (entry) |
7f06a3d8 | 168 | debugs(44, 3, *entry << ' ' << entry->url()); |
86b389fc | 169 | else |
7f06a3d8 | 170 | debugs(44, 3, request->method); |
62e76326 | 171 | |
cb835136 | 172 | const auto selector = new PeerSelector(initiator); |
62e76326 | 173 | |
cb835136 AR |
174 | selector->request = request; |
175 | HTTPMSGLOCK(selector->request); | |
176 | selector->al = al; | |
62e76326 | 177 | |
cb835136 | 178 | selector->entry = entry; |
62e76326 | 179 | |
6cfa8966 | 180 | #if USE_CACHE_DIGESTS |
62e76326 | 181 | |
39edba21 | 182 | request->hier.peer_select_start = current_time; |
62e76326 | 183 | |
39edba21 | 184 | #endif |
62e76326 | 185 | |
cb835136 AR |
186 | if (selector->entry) |
187 | selector->entry->lock("peerSelect"); | |
62e76326 | 188 | |
cb835136 | 189 | selector->selectMore(); |
75e88d56 | 190 | } |
191 | ||
6043e368 AR |
192 | void |
193 | PeerSelectionInitiator::startSelectingDestinations(HttpRequest *request, const AccessLogEntry::Pointer &ale, StoreEntry *entry) | |
194 | { | |
195 | subscribed = true; | |
196 | peerSelect(this, request, ale, entry); | |
197 | // and wait for noteDestination() and/or noteDestinationsEnd() calls | |
198 | } | |
199 | ||
cb835136 AR |
200 | void |
201 | PeerSelector::checkNeverDirectDone(const allow_t answer) | |
75e88d56 | 202 | { |
cb835136 AR |
203 | acl_checklist = nullptr; |
204 | debugs(44, 3, answer); | |
205 | never_direct = answer; | |
3985b3f8 | 206 | switch (answer) { |
ae026ec6 | 207 | case ACCESS_ALLOWED: |
f365d297 | 208 | /** if never_direct says YES, do that. */ |
cb835136 AR |
209 | direct = DIRECT_NO; |
210 | debugs(44, 3, "direct = " << DirectStr[direct] << " (never_direct allow)"); | |
ae026ec6 AJ |
211 | break; |
212 | case ACCESS_DENIED: // not relevant. | |
1f585949 | 213 | case ACCESS_DUNNO: // not relevant. |
ae026ec6 | 214 | break; |
1f585949 | 215 | case ACCESS_AUTH_REQUIRED: |
ae026ec6 | 216 | debugs(44, DBG_IMPORTANT, "WARNING: never_direct resulted in " << answer << ". Username ACLs are not reliable here."); |
1f585949 | 217 | break; |
ae026ec6 | 218 | } |
cb835136 | 219 | selectMore(); |
75e88d56 | 220 | } |
221 | ||
cb835136 AR |
222 | void |
223 | PeerSelector::CheckNeverDirectDone(allow_t answer, void *data) | |
75e88d56 | 224 | { |
cb835136 AR |
225 | static_cast<PeerSelector*>(data)->checkNeverDirectDone(answer); |
226 | } | |
227 | ||
228 | void | |
229 | PeerSelector::checkAlwaysDirectDone(const allow_t answer) | |
230 | { | |
231 | acl_checklist = nullptr; | |
232 | debugs(44, 3, answer); | |
233 | always_direct = answer; | |
3985b3f8 | 234 | switch (answer) { |
ae026ec6 AJ |
235 | case ACCESS_ALLOWED: |
236 | /** if always_direct says YES, do that. */ | |
cb835136 AR |
237 | direct = DIRECT_YES; |
238 | debugs(44, 3, "direct = " << DirectStr[direct] << " (always_direct allow)"); | |
ae026ec6 AJ |
239 | break; |
240 | case ACCESS_DENIED: // not relevant. | |
1f585949 | 241 | case ACCESS_DUNNO: // not relevant. |
ae026ec6 | 242 | break; |
1f585949 | 243 | case ACCESS_AUTH_REQUIRED: |
ae026ec6 | 244 | debugs(44, DBG_IMPORTANT, "WARNING: always_direct resulted in " << answer << ". Username ACLs are not reliable here."); |
1f585949 | 245 | break; |
ae026ec6 | 246 | } |
cb835136 AR |
247 | selectMore(); |
248 | } | |
249 | ||
250 | void | |
251 | PeerSelector::CheckAlwaysDirectDone(allow_t answer, void *data) | |
252 | { | |
253 | static_cast<PeerSelector*>(data)->checkAlwaysDirectDone(answer); | |
75e88d56 | 254 | } |
255 | ||
cb835136 | 256 | /// \returns true (after destroying "this") if the peer initiator is gone |
6043e368 | 257 | /// \returns false (without side effects) otherwise |
cb835136 AR |
258 | bool |
259 | PeerSelector::selectionAborted() | |
6043e368 | 260 | { |
cb835136 | 261 | if (interestedInitiator()) |
6043e368 AR |
262 | return false; |
263 | ||
264 | debugs(44, 3, "Aborting peer selection: Initiator gone or lost interest."); | |
cb835136 | 265 | delete this; |
6043e368 AR |
266 | return true; |
267 | } | |
268 | ||
cb835136 | 269 | /// A single DNS resolution loop iteration: Converts selected FwdServer to IPs. |
cfd66529 | 270 | void |
cb835136 | 271 | PeerSelector::resolveSelected() |
cfd66529 | 272 | { |
cb835136 | 273 | if (selectionAborted()) |
36339742 | 274 | return; |
6043e368 | 275 | |
cb835136 | 276 | FwdServer *fs = servers; |
36339742 | 277 | |
7177edfb AJ |
278 | // Bug 3243: CVE 2009-0801 |
279 | // Bypass of browser same-origin access control in intercepted communication | |
280 | // To resolve this we must use only the original client destination when going DIRECT | |
281 | // on intercepted traffic which failed Host verification | |
cb835136 | 282 | const HttpRequest *req = request; |
45e5102d | 283 | const bool isIntercepted = !req->flags.redirected && |
0d901ef4 | 284 | (req->flags.intercepted || req->flags.interceptTproxy); |
45e5102d | 285 | const bool useOriginalDst = Config.onoff.client_dst_passthru || !req->flags.hostVerified; |
7177edfb AJ |
286 | const bool choseDirect = fs && fs->code == HIER_DIRECT; |
287 | if (isIntercepted && useOriginalDst && choseDirect) { | |
d9371d7b AJ |
288 | // check the client is still around before using any of its details |
289 | if (req->clientConnectionManager.valid()) { | |
290 | // construct a "result" adding the ORIGINAL_DST to the set instead of DIRECT | |
291 | Comm::ConnectionPointer p = new Comm::Connection(); | |
292 | p->remote = req->clientConnectionManager->clientConnection->local; | |
6043e368 | 293 | fs->code = ORIGINAL_DST; // fs->code is DIRECT. This fixes the display. |
cb835136 | 294 | handlePath(p, *fs); |
d9371d7b | 295 | } |
7177edfb AJ |
296 | |
297 | // clear the used fs and continue | |
cb835136 | 298 | servers = fs->next; |
3c670b50 | 299 | delete fs; |
cb835136 | 300 | resolveSelected(); |
7177edfb AJ |
301 | return; |
302 | } | |
303 | ||
cfd66529 | 304 | // convert the list of FwdServer destinations into destinations IP addresses |
cb835136 | 305 | if (fs && wantsMoreDestinations()) { |
cfd66529 | 306 | // send the next one off for DNS lookup. |
cb835136 AR |
307 | const char *host = fs->_peer.valid() ? fs->_peer->host : request->url.host(); |
308 | debugs(44, 2, "Find IP destination for: " << url() << "' via " << host); | |
309 | Dns::nbgethostbyname(host, this); | |
cfd66529 AJ |
310 | return; |
311 | } | |
312 | ||
c2f4e9cc AJ |
313 | // Bug 3605: clear any extra listed FwdServer destinations, when the options exceeds max_foward_tries. |
314 | // due to the allocation method of fs, we must deallocate each manually. | |
315 | // TODO: use a std::list so we can get the size and abort adding whenever the selection loops reach Config.forward_max_tries | |
6043e368 | 316 | if (fs) { |
cb835136 | 317 | assert(fs == servers); |
9bc68187 | 318 | while (fs) { |
cb835136 | 319 | servers = fs->next; |
3c670b50 | 320 | delete fs; |
cb835136 | 321 | fs = servers; |
c2f4e9cc AJ |
322 | } |
323 | } | |
324 | ||
cfd66529 | 325 | // done with DNS lookups. pass back to caller |
62e76326 | 326 | |
cb835136 AR |
327 | debugs(44, 2, id << " found all " << foundPaths << " destinations for " << url()); |
328 | debugs(44, 2, " always_direct = " << always_direct); | |
329 | debugs(44, 2, " never_direct = " << never_direct); | |
330 | debugs(44, 2, " timedout = " << ping.timedout); | |
5ae21d99 | 331 | |
cb835136 AR |
332 | ping.stop = current_time; |
333 | request->hier.ping = ping; // final result | |
3dfe8371 | 334 | |
cb835136 | 335 | if (lastError && foundPaths) { |
6043e368 AR |
336 | // nobody cares about errors if we found destinations despite them |
337 | debugs(44, 3, "forgetting the last error"); | |
cb835136 AR |
338 | delete lastError; |
339 | lastError = nullptr; | |
db1cd23c | 340 | } |
62e76326 | 341 | |
cb835136 AR |
342 | if (const auto initiator = interestedInitiator()) |
343 | initiator->noteDestinationsEnd(lastError); | |
344 | lastError = nullptr; // initiator owns the ErrorState object now | |
345 | delete this; | |
93775f90 | 346 | } |
347 | ||
fd9c47d1 | 348 | void |
cb835136 | 349 | PeerSelector::noteLookup(const Dns::LookupDetails &details) |
cfd66529 | 350 | { |
fd9c47d1 | 351 | /* ignore lookup delays that occurred after the initiator moved on */ |
cfd66529 | 352 | |
cb835136 | 353 | if (selectionAborted()) |
fd9c47d1 | 354 | return; |
cfd66529 | 355 | |
fd9c47d1 AR |
356 | if (!wantsMoreDestinations()) |
357 | return; | |
cfd66529 | 358 | |
fd9c47d1 AR |
359 | request->recordLookup(details); |
360 | } | |
5229395c | 361 | |
fd9c47d1 | 362 | void |
cb835136 | 363 | PeerSelector::noteIp(const Ip::Address &ip) |
fd9c47d1 | 364 | { |
cb835136 | 365 | if (selectionAborted()) |
fd9c47d1 | 366 | return; |
cfd66529 | 367 | |
fd9c47d1 AR |
368 | if (!wantsMoreDestinations()) |
369 | return; | |
27d1f0a0 | 370 | |
fd9c47d1 | 371 | const auto peer = servers->_peer.valid(); |
cfd66529 | 372 | |
fd9c47d1 AR |
373 | // for TPROXY spoofing, we must skip unusable addresses |
374 | if (request->flags.spoofClientIp && !(peer && peer->options.no_tproxy) ) { | |
375 | if (ip.isIPv4() != request->client_addr.isIPv4()) | |
376 | return; // cannot spoof the client address on this link | |
377 | } | |
c7a52e6d | 378 | |
fd9c47d1 AR |
379 | Comm::ConnectionPointer p = new Comm::Connection(); |
380 | p->remote = ip; | |
381 | p->remote.port(peer ? peer->http_port : request->url.port()); | |
382 | handlePath(p, *servers); | |
383 | } | |
c7a52e6d | 384 | |
fd9c47d1 | 385 | void |
cb835136 | 386 | PeerSelector::noteIps(const Dns::CachedIps *ia, const Dns::LookupDetails &details) |
fd9c47d1 | 387 | { |
cb835136 | 388 | if (selectionAborted()) |
fd9c47d1 | 389 | return; |
cfd66529 | 390 | |
fd9c47d1 AR |
391 | FwdServer *fs = servers; |
392 | if (!ia) { | |
393 | debugs(44, 3, "Unknown host: " << (fs->_peer.valid() ? fs->_peer->host : request->url.host())); | |
a37fdd8a | 394 | // discard any previous error. |
fd9c47d1 AR |
395 | delete lastError; |
396 | lastError = NULL; | |
a37fdd8a | 397 | if (fs->code == HIER_DIRECT) { |
fd9c47d1 AR |
398 | lastError = new ErrorState(ERR_DNS_FAIL, Http::scServiceUnavailable, request); |
399 | lastError->dnsError = details.error; | |
a37fdd8a | 400 | } |
cfd66529 | 401 | } |
fd9c47d1 | 402 | // else noteIp() calls have already processed all IPs in *ia |
cfd66529 | 403 | |
fd9c47d1 | 404 | servers = fs->next; |
3c670b50 | 405 | delete fs; |
cfd66529 | 406 | |
cb835136 AR |
407 | // continue resolving selected peers |
408 | resolveSelected(); | |
cfd66529 AJ |
409 | } |
410 | ||
cb835136 AR |
411 | int |
412 | PeerSelector::checkNetdbDirect() | |
b3264694 | 413 | { |
9b5c4a9a | 414 | #if USE_ICMP |
a3c6762c | 415 | CachePeer *p; |
b3264694 | 416 | int myrtt; |
417 | int myhops; | |
62e76326 | 418 | |
cb835136 | 419 | if (direct == DIRECT_NO) |
62e76326 | 420 | return 0; |
421 | ||
9b5c4a9a AJ |
422 | /* base lookup on RTT and Hops if ICMP NetDB is enabled. */ |
423 | ||
cb835136 | 424 | myrtt = netdbHostRtt(request->url.host()); |
5c51bffb AJ |
425 | debugs(44, 3, "MY RTT = " << myrtt << " msec"); |
426 | debugs(44, 3, "minimum_direct_rtt = " << Config.minDirectRtt << " msec"); | |
62e76326 | 427 | |
5f84d830 | 428 | if (myrtt && myrtt <= Config.minDirectRtt) |
62e76326 | 429 | return 1; |
430 | ||
cb835136 | 431 | myhops = netdbHostHops(request->url.host()); |
62e76326 | 432 | |
cb835136 AR |
433 | debugs(44, 3, "MY hops = " << myhops); |
434 | debugs(44, 3, "minimum_direct_hops = " << Config.minDirectHops); | |
62e76326 | 435 | |
b3264694 | 436 | if (myhops && myhops <= Config.minDirectHops) |
62e76326 | 437 | return 1; |
438 | ||
cb835136 | 439 | p = whichPeer(closest_parent_miss); |
62e76326 | 440 | |
5f84d830 | 441 | if (p == NULL) |
62e76326 | 442 | return 0; |
443 | ||
cb835136 | 444 | debugs(44, 3, "closest_parent_miss RTT = " << ping.p_rtt << " msec"); |
62e76326 | 445 | |
cb835136 | 446 | if (myrtt && myrtt <= ping.p_rtt) |
62e76326 | 447 | return 1; |
448 | ||
9b5c4a9a AJ |
449 | #endif /* USE_ICMP */ |
450 | ||
b3264694 | 451 | return 0; |
452 | } | |
453 | ||
cb835136 AR |
454 | void |
455 | PeerSelector::selectMore() | |
062e2281 | 456 | { |
cb835136 | 457 | if (selectionAborted()) |
36339742 | 458 | return; |
36339742 | 459 | |
5c51bffb | 460 | debugs(44, 3, request->method << ' ' << request->url.host()); |
62e76326 | 461 | |
45e5102d | 462 | /** If we don't know whether DIRECT is permitted ... */ |
cb835136 AR |
463 | if (direct == DIRECT_UNKNOWN) { |
464 | if (always_direct == ACCESS_DUNNO) { | |
465 | debugs(44, 3, "direct = " << DirectStr[direct] << " (always_direct to be checked)"); | |
45e5102d | 466 | /** check always_direct; */ |
d4806c91 | 467 | ACLFilledChecklist *ch = new ACLFilledChecklist(Config.accessList.AlwaysDirect, request, NULL); |
cb835136 AR |
468 | ch->al = al; |
469 | acl_checklist = ch; | |
cb365059 | 470 | acl_checklist->syncAle(request, nullptr); |
cb835136 | 471 | acl_checklist->nonBlockingCheck(CheckAlwaysDirectDone, this); |
62e76326 | 472 | return; |
cb835136 AR |
473 | } else if (never_direct == ACCESS_DUNNO) { |
474 | debugs(44, 3, "direct = " << DirectStr[direct] << " (never_direct to be checked)"); | |
45e5102d | 475 | /** check never_direct; */ |
d4806c91 | 476 | ACLFilledChecklist *ch = new ACLFilledChecklist(Config.accessList.NeverDirect, request, NULL); |
cb835136 AR |
477 | ch->al = al; |
478 | acl_checklist = ch; | |
cb365059 | 479 | acl_checklist->syncAle(request, nullptr); |
cb835136 | 480 | acl_checklist->nonBlockingCheck(CheckNeverDirectDone, this); |
62e76326 | 481 | return; |
450fe1cb | 482 | } else if (request->flags.noDirect) { |
45e5102d | 483 | /** if we are accelerating, direct is not an option. */ |
cb835136 AR |
484 | direct = DIRECT_NO; |
485 | debugs(44, 3, "direct = " << DirectStr[direct] << " (forced non-direct)"); | |
450fe1cb | 486 | } else if (request->flags.loopDetected) { |
45e5102d | 487 | /** if we are in a forwarding-loop, direct is not an option. */ |
cb835136 AR |
488 | direct = DIRECT_YES; |
489 | debugs(44, 3, "direct = " << DirectStr[direct] << " (forwarding loop detected)"); | |
490 | } else if (checkNetdbDirect()) { | |
491 | direct = DIRECT_YES; | |
492 | debugs(44, 3, "direct = " << DirectStr[direct] << " (checkNetdbDirect)"); | |
62e76326 | 493 | } else { |
cb835136 AR |
494 | direct = DIRECT_MAYBE; |
495 | debugs(44, 3, "direct = " << DirectStr[direct] << " (default)"); | |
62e76326 | 496 | } |
497 | ||
cb835136 | 498 | debugs(44, 3, "direct = " << DirectStr[direct]); |
db1cd23c | 499 | } |
62e76326 | 500 | |
d67acb4e | 501 | if (!entry || entry->ping_status == PING_NONE) |
cb835136 | 502 | selectPinned(); |
df503d6c | 503 | if (entry == NULL) { |
62e76326 | 504 | (void) 0; |
df503d6c | 505 | } else if (entry->ping_status == PING_NONE) { |
cb835136 | 506 | selectSomeNeighbor(); |
62e76326 | 507 | |
508 | if (entry->ping_status == PING_WAITING) | |
509 | return; | |
db1cd23c | 510 | } else if (entry->ping_status == PING_WAITING) { |
cb835136 | 511 | selectSomeNeighborReplies(); |
62e76326 | 512 | entry->ping_status = PING_DONE; |
db1cd23c | 513 | } |
62e76326 | 514 | |
cb835136 | 515 | switch (direct) { |
62e76326 | 516 | |
168dfda9 | 517 | case DIRECT_YES: |
cb835136 | 518 | selectSomeDirect(); |
62e76326 | 519 | break; |
520 | ||
168dfda9 | 521 | case DIRECT_NO: |
cb835136 AR |
522 | selectSomeParent(); |
523 | selectAllParents(); | |
62e76326 | 524 | break; |
525 | ||
168dfda9 | 526 | default: |
62e76326 | 527 | |
528 | if (Config.onoff.prefer_direct) | |
cb835136 | 529 | selectSomeDirect(); |
62e76326 | 530 | |
45e5102d | 531 | if (request->flags.hierarchical || !Config.onoff.nonhierarchical_direct) { |
cb835136 AR |
532 | selectSomeParent(); |
533 | selectAllParents(); | |
8b9a89c9 | 534 | } |
62e76326 | 535 | |
536 | if (!Config.onoff.prefer_direct) | |
cb835136 | 537 | selectSomeDirect(); |
62e76326 | 538 | |
539 | break; | |
168dfda9 | 540 | } |
62e76326 | 541 | |
cb835136 AR |
542 | // end peer selection; start resolving selected peers |
543 | resolveSelected(); | |
db1cd23c | 544 | } |
545 | ||
cb365059 | 546 | bool peerAllowedToUse(const CachePeer *, PeerSelector*); |
cfd66529 | 547 | |
cb835136 AR |
548 | /// Selects a pinned connection if it exists, is valid, and is allowed. |
549 | void | |
550 | PeerSelector::selectPinned() | |
d67acb4e | 551 | { |
cb835136 | 552 | // TODO: Avoid all repeated calls. Relying on PING_DONE is not enough. |
d67acb4e AJ |
553 | if (!request->pinnedConnection()) |
554 | return; | |
a3c6762c | 555 | CachePeer *pear = request->pinnedConnection()->pinnedPeer(); |
e3a4aecc | 556 | if (Comm::IsConnOpen(request->pinnedConnection()->validatePinnedConnection(request, pear))) { |
cb365059 | 557 | const bool usePinned = pear ? peerAllowedToUse(pear, this) : (direct != DIRECT_NO); |
cb835136 AR |
558 | if (usePinned) { |
559 | addSelection(pear, PINNED); | |
560 | if (entry) | |
561 | entry->ping_status = PING_DONE; // skip ICP | |
d67acb4e AJ |
562 | } |
563 | } | |
cb835136 AR |
564 | // If the pinned connection is prohibited (for this request) or gone, then |
565 | // the initiator must decide whether it is OK to open a new one instead. | |
d67acb4e AJ |
566 | } |
567 | ||
27774cee | 568 | /** |
db1cd23c | 569 | * Selects a neighbor (parent or sibling) based on one of the |
570 | * following methods: | |
571 | * Cache Digests | |
572 | * CARP | |
9b5c4a9a | 573 | * ICMP Netdb RTT estimates |
db1cd23c | 574 | * ICP/HTCP queries |
575 | */ | |
cb835136 AR |
576 | void |
577 | PeerSelector::selectSomeNeighbor() | |
db1cd23c | 578 | { |
a3c6762c | 579 | CachePeer *p; |
db1cd23c | 580 | hier_code code = HIER_NONE; |
581 | assert(entry->ping_status == PING_NONE); | |
62e76326 | 582 | |
cb835136 | 583 | if (direct == DIRECT_YES) { |
62e76326 | 584 | entry->ping_status = PING_DONE; |
585 | return; | |
124511e5 | 586 | } |
62e76326 | 587 | |
6cfa8966 | 588 | #if USE_CACHE_DIGESTS |
cb365059 | 589 | if ((p = neighborsDigestSelect(this))) { |
5c51bffb | 590 | if (neighborType(p, request->url) == PEER_PARENT) |
62e76326 | 591 | code = CD_PARENT_HIT; |
592 | else | |
593 | code = CD_SIBLING_HIT; | |
db1cd23c | 594 | } else |
c127134a | 595 | #endif |
cb365059 | 596 | if ((p = netdbClosestParent(this))) { |
62e76326 | 597 | code = CLOSEST_PARENT; |
cb365059 | 598 | } else if (peerSelectIcpPing(this, direct, entry)) { |
cb835136 AR |
599 | debugs(44, 3, "Doing ICP pings"); |
600 | ping.start = current_time; | |
601 | ping.n_sent = neighborsUdpPing(request, | |
602 | entry, | |
603 | HandlePingReply, | |
604 | this, | |
605 | &ping.n_replies_expected, | |
606 | &ping.timeout); | |
607 | ||
608 | if (ping.n_sent == 0) | |
fa84c01d | 609 | debugs(44, DBG_CRITICAL, "WARNING: neighborsUdpPing returned 0"); |
cb835136 AR |
610 | debugs(44, 3, ping.n_replies_expected << |
611 | " ICP replies expected, RTT " << ping.timeout << | |
26ac0430 | 612 | " msec"); |
62e76326 | 613 | |
cb835136 | 614 | if (ping.n_replies_expected > 0) { |
62e76326 | 615 | entry->ping_status = PING_WAITING; |
cb835136 AR |
616 | eventAdd("PeerSelector::HandlePingTimeout", |
617 | HandlePingTimeout, | |
618 | this, | |
619 | 0.001 * ping.timeout, | |
62e76326 | 620 | 0); |
621 | return; | |
622 | } | |
623 | } | |
624 | ||
db1cd23c | 625 | if (code != HIER_NONE) { |
62e76326 | 626 | assert(p); |
cb835136 | 627 | addSelection(p, code); |
db1cd23c | 628 | } |
62e76326 | 629 | |
db1cd23c | 630 | entry->ping_status = PING_DONE; |
631 | } | |
632 | ||
cb835136 AR |
633 | /// Selects a neighbor (parent or sibling) based on ICP/HTCP replies. |
634 | void | |
635 | PeerSelector::selectSomeNeighborReplies() | |
db1cd23c | 636 | { |
a3c6762c | 637 | CachePeer *p = NULL; |
db1cd23c | 638 | hier_code code = HIER_NONE; |
cb835136 AR |
639 | assert(entry->ping_status == PING_WAITING); |
640 | assert(direct != DIRECT_YES); | |
62e76326 | 641 | |
cb835136 | 642 | if (checkNetdbDirect()) { |
62e76326 | 643 | code = CLOSEST_DIRECT; |
cb835136 | 644 | addSelection(nullptr, code); |
62e76326 | 645 | return; |
db1cd23c | 646 | } |
62e76326 | 647 | |
cb835136 AR |
648 | if ((p = hit)) { |
649 | code = hit_type == PEER_PARENT ? PARENT_HIT : SIBLING_HIT; | |
26ac0430 | 650 | } else { |
cb835136 AR |
651 | if (!closest_parent_miss.isAnyAddr()) { |
652 | p = whichPeer(closest_parent_miss); | |
cc192b50 | 653 | code = CLOSEST_PARENT_MISS; |
cb835136 AR |
654 | } else if (!first_parent_miss.isAnyAddr()) { |
655 | p = whichPeer(first_parent_miss); | |
cc192b50 | 656 | code = FIRST_PARENT_MISS; |
657 | } | |
658 | } | |
db1cd23c | 659 | if (p && code != HIER_NONE) { |
cb835136 | 660 | addSelection(p, code); |
db1cd23c | 661 | } |
662 | } | |
663 | ||
cb835136 AR |
664 | /// Adds a "direct" entry if the request can be forwarded to the origin server. |
665 | void | |
666 | PeerSelector::selectSomeDirect() | |
db1cd23c | 667 | { |
cb835136 | 668 | if (direct == DIRECT_NO) |
62e76326 | 669 | return; |
670 | ||
db80e881 | 671 | /* WAIS is not implemented natively */ |
cb835136 | 672 | if (request->url.getScheme() == AnyP::PROTO_WAIS) |
26ac0430 | 673 | return; |
db80e881 | 674 | |
cb835136 | 675 | addSelection(nullptr, HIER_DIRECT); |
db1cd23c | 676 | } |
677 | ||
cb835136 AR |
678 | void |
679 | PeerSelector::selectSomeParent() | |
db1cd23c | 680 | { |
a3c6762c | 681 | CachePeer *p; |
db1cd23c | 682 | hier_code code = HIER_NONE; |
5c51bffb | 683 | debugs(44, 3, request->method << ' ' << request->url.host()); |
62e76326 | 684 | |
cb835136 | 685 | if (direct == DIRECT_YES) |
62e76326 | 686 | return; |
687 | ||
cb365059 | 688 | if ((p = peerSourceHashSelectParent(this))) { |
b4ab8666 | 689 | code = SOURCEHASH_PARENT; |
2f1431ea | 690 | #if USE_AUTH |
cb365059 | 691 | } else if ((p = peerUserHashSelectParent(this))) { |
f7e1d9ce | 692 | code = USERHASH_PARENT; |
2f1431ea | 693 | #endif |
cb365059 | 694 | } else if ((p = carpSelectParent(this))) { |
62e76326 | 695 | code = CARP; |
cb365059 | 696 | } else if ((p = getRoundRobinParent(this))) { |
62e76326 | 697 | code = ROUNDROBIN_PARENT; |
cb365059 | 698 | } else if ((p = getWeightedRoundRobinParent(this))) { |
62e76326 | 699 | code = ROUNDROBIN_PARENT; |
cb365059 | 700 | } else if ((p = getFirstUpParent(this))) { |
62e76326 | 701 | code = FIRSTUP_PARENT; |
cb365059 | 702 | } else if ((p = getDefaultParent(this))) { |
b4ab8666 | 703 | code = DEFAULT_PARENT; |
db1cd23c | 704 | } |
62e76326 | 705 | |
db1cd23c | 706 | if (code != HIER_NONE) { |
cb835136 | 707 | addSelection(p, code); |
062e2281 | 708 | } |
709 | } | |
710 | ||
cb835136 AR |
711 | /// Adds alive parents. Used as a last resort for never_direct. |
712 | void | |
713 | PeerSelector::selectAllParents() | |
168dfda9 | 714 | { |
a3c6762c | 715 | CachePeer *p; |
168dfda9 | 716 | /* Add all alive parents */ |
62e76326 | 717 | |
168dfda9 | 718 | for (p = Config.peers; p; p = p->next) { |
62e76326 | 719 | /* XXX: neighbors.c lacks a public interface for enumerating |
720 | * parents to a request so we have to dig some here.. | |
721 | */ | |
722 | ||
5c51bffb | 723 | if (neighborType(p, request->url) != PEER_PARENT) |
62e76326 | 724 | continue; |
725 | ||
cb365059 | 726 | if (!peerHTTPOkay(p, this)) |
62e76326 | 727 | continue; |
728 | ||
cb835136 | 729 | addSelection(p, ANY_OLD_PARENT); |
168dfda9 | 730 | } |
62e76326 | 731 | |
168dfda9 | 732 | /* XXX: should add dead parents here, but it is currently |
733 | * not possible to find out which parents are dead or which | |
734 | * simply are not configured to handle the request. | |
735 | */ | |
736 | /* Add default parent as a last resort */ | |
cb365059 | 737 | if ((p = getDefaultParent(this))) { |
cb835136 | 738 | addSelection(p, DEFAULT_PARENT); |
168dfda9 | 739 | } |
740 | } | |
741 | ||
cb835136 AR |
742 | void |
743 | PeerSelector::handlePingTimeout() | |
062e2281 | 744 | { |
cb835136 | 745 | debugs(44, 3, url()); |
62e76326 | 746 | |
cb835136 | 747 | if (entry) |
6043e368 AR |
748 | entry->ping_status = PING_DONE; |
749 | ||
cb835136 | 750 | if (selectionAborted()) |
62e76326 | 751 | return; |
62e76326 | 752 | |
5db6bf73 | 753 | ++PeerStats.timeouts; |
cb835136 AR |
754 | ping.timedout = 1; |
755 | selectMore(); | |
756 | } | |
757 | ||
758 | void | |
759 | PeerSelector::HandlePingTimeout(void *data) | |
760 | { | |
761 | static_cast<PeerSelector*>(data)->handlePingTimeout(); | |
85034133 | 762 | } |
763 | ||
764 | void | |
765 | peerSelectInit(void) | |
766 | { | |
75e88d56 | 767 | memset(&PeerStats, '\0', sizeof(PeerStats)); |
062e2281 | 768 | } |
93775f90 | 769 | |
cb835136 AR |
770 | void |
771 | PeerSelector::handleIcpParentMiss(CachePeer *p, icp_common_t *header) | |
b3264694 | 772 | { |
773 | int rtt; | |
62e76326 | 774 | |
9b5c4a9a | 775 | #if USE_ICMP |
b3264694 | 776 | if (Config.onoff.query_icmp) { |
62e76326 | 777 | if (header->flags & ICP_FLAG_SRC_RTT) { |
778 | rtt = header->pad & 0xFFFF; | |
9b5c4a9a | 779 | int hops = (header->pad >> 16) & 0xFFFF; |
62e76326 | 780 | |
781 | if (rtt > 0 && rtt < 0xFFFF) | |
cb835136 | 782 | netdbUpdatePeer(request->url, p, rtt, hops); |
62e76326 | 783 | |
cb835136 AR |
784 | if (rtt && (ping.p_rtt == 0 || rtt < ping.p_rtt)) { |
785 | closest_parent_miss = p->in_addr; | |
786 | ping.p_rtt = rtt; | |
62e76326 | 787 | } |
788 | } | |
b3264694 | 789 | } |
9b5c4a9a | 790 | #endif /* USE_ICMP */ |
62e76326 | 791 | |
18ec72b2 | 792 | /* if closest-only is set, then don't allow FIRST_PARENT_MISS */ |
cd196bc8 | 793 | if (p->options.closest_only) |
62e76326 | 794 | return; |
795 | ||
85223cd7 | 796 | /* set FIRST_MISS if there is no CLOSEST parent */ |
cb835136 | 797 | if (!closest_parent_miss.isAnyAddr()) |
62e76326 | 798 | return; |
799 | ||
cb835136 | 800 | rtt = (tvSubMsec(ping.start, current_time) - p->basetime) / p->weight; |
62e76326 | 801 | |
d1b63fc8 | 802 | if (rtt < 1) |
62e76326 | 803 | rtt = 1; |
804 | ||
cb835136 AR |
805 | if (first_parent_miss.isAnyAddr() || rtt < ping.w_rtt) { |
806 | first_parent_miss = p->in_addr; | |
807 | ping.w_rtt = rtt; | |
b3264694 | 808 | } |
809 | } | |
93775f90 | 810 | |
cb835136 AR |
811 | void |
812 | PeerSelector::handleIcpReply(CachePeer *p, const peer_t type, icp_common_t *header) | |
93775f90 | 813 | { |
e6ccf245 | 814 | icp_opcode op = header->getOpCode(); |
cb835136 | 815 | debugs(44, 3, icp_opcode_str[op] << ' ' << url()); |
69c95dd3 | 816 | #if USE_CACHE_DIGESTS && 0 |
26b164ac | 817 | /* do cd lookup to count false misses */ |
62e76326 | 818 | |
3ab66981 | 819 | if (p && request) |
62e76326 | 820 | peerNoteDigestLookup(request, p, |
cb365059 | 821 | peerDigestLookup(p, this)); |
62e76326 | 822 | |
26b164ac | 823 | #endif |
62e76326 | 824 | |
cb835136 | 825 | ++ping.n_recv; |
62e76326 | 826 | |
27cd7235 | 827 | if (op == ICP_MISS || op == ICP_DECHO) { |
62e76326 | 828 | if (type == PEER_PARENT) |
cb835136 | 829 | handleIcpParentMiss(p, header); |
a7c05555 | 830 | } else if (op == ICP_HIT) { |
cb835136 AR |
831 | hit = p; |
832 | hit_type = type; | |
833 | selectMore(); | |
62e76326 | 834 | return; |
db1cd23c | 835 | } |
62e76326 | 836 | |
cb835136 | 837 | if (ping.n_recv < ping.n_replies_expected) |
62e76326 | 838 | return; |
839 | ||
cb835136 | 840 | selectMore(); |
93775f90 | 841 | } |
86aebcda | 842 | |
843 | #if USE_HTCP | |
cb835136 AR |
844 | void |
845 | PeerSelector::handleHtcpReply(CachePeer *p, const peer_t type, HtcpReplyData *htcp) | |
86aebcda | 846 | { |
cb835136 AR |
847 | debugs(44, 3, (htcp->hit ? "HIT" : "MISS") << ' ' << url()); |
848 | ++ping.n_recv; | |
62e76326 | 849 | |
44e237d0 | 850 | if (htcp->hit) { |
cb835136 AR |
851 | hit = p; |
852 | hit_type = type; | |
853 | selectMore(); | |
62e76326 | 854 | return; |
44e237d0 | 855 | } |
62e76326 | 856 | |
44e237d0 | 857 | if (type == PEER_PARENT) |
cb835136 | 858 | handleHtcpParentMiss(p, htcp); |
62e76326 | 859 | |
cb835136 | 860 | if (ping.n_recv < ping.n_replies_expected) |
62e76326 | 861 | return; |
862 | ||
cb835136 | 863 | selectMore(); |
44e237d0 | 864 | } |
865 | ||
cb835136 AR |
866 | void |
867 | PeerSelector::handleHtcpParentMiss(CachePeer *p, HtcpReplyData *htcp) | |
44e237d0 | 868 | { |
869 | int rtt; | |
62e76326 | 870 | |
9b5c4a9a | 871 | #if USE_ICMP |
44e237d0 | 872 | if (Config.onoff.query_icmp) { |
62e76326 | 873 | if (htcp->cto.rtt > 0) { |
874 | rtt = (int) htcp->cto.rtt * 1000; | |
9b5c4a9a | 875 | int hops = (int) htcp->cto.hops * 1000; |
cb835136 | 876 | netdbUpdatePeer(request->url, p, rtt, hops); |
62e76326 | 877 | |
cb835136 AR |
878 | if (rtt && (ping.p_rtt == 0 || rtt < ping.p_rtt)) { |
879 | closest_parent_miss = p->in_addr; | |
880 | ping.p_rtt = rtt; | |
62e76326 | 881 | } |
882 | } | |
44e237d0 | 883 | } |
9b5c4a9a | 884 | #endif /* USE_ICMP */ |
62e76326 | 885 | |
44e237d0 | 886 | /* if closest-only is set, then don't allow FIRST_PARENT_MISS */ |
cd196bc8 | 887 | if (p->options.closest_only) |
62e76326 | 888 | return; |
889 | ||
44e237d0 | 890 | /* set FIRST_MISS if there is no CLOSEST parent */ |
cb835136 | 891 | if (!closest_parent_miss.isAnyAddr()) |
62e76326 | 892 | return; |
893 | ||
cb835136 | 894 | rtt = (tvSubMsec(ping.start, current_time) - p->basetime) / p->weight; |
62e76326 | 895 | |
d1b63fc8 | 896 | if (rtt < 1) |
62e76326 | 897 | rtt = 1; |
898 | ||
cb835136 AR |
899 | if (first_parent_miss.isAnyAddr() || rtt < ping.w_rtt) { |
900 | first_parent_miss = p->in_addr; | |
901 | ping.w_rtt = rtt; | |
44e237d0 | 902 | } |
86aebcda | 903 | } |
62e76326 | 904 | |
86aebcda | 905 | #endif |
906 | ||
cb835136 AR |
907 | void |
908 | PeerSelector::HandlePingReply(CachePeer * p, peer_t type, AnyP::ProtocolType proto, void *pingdata, void *data) | |
86aebcda | 909 | { |
0c3d3f65 | 910 | if (proto == AnyP::PROTO_ICP) |
cb835136 | 911 | static_cast<PeerSelector*>(data)->handleIcpReply(p, type, static_cast<icp_common_t*>(pingdata)); |
62e76326 | 912 | |
86aebcda | 913 | #if USE_HTCP |
62e76326 | 914 | |
0c3d3f65 | 915 | else if (proto == AnyP::PROTO_HTCP) |
cb835136 | 916 | static_cast<PeerSelector*>(data)->handleHtcpReply(p, type, static_cast<HtcpReplyData*>(pingdata)); |
62e76326 | 917 | |
86aebcda | 918 | #endif |
62e76326 | 919 | |
86aebcda | 920 | else |
cb835136 | 921 | debugs(44, DBG_IMPORTANT, "ERROR: ignoring an ICP reply with unknown protocol " << proto); |
86aebcda | 922 | } |
db1cd23c | 923 | |
cb835136 AR |
924 | void |
925 | PeerSelector::addSelection(CachePeer *peer, const hier_code code) | |
db1cd23c | 926 | { |
e7b08eec | 927 | // Find the end of the servers list. Bail on a duplicate destination. |
cb835136 AR |
928 | auto **serversTail = &servers; |
929 | while (const auto server = *serversTail) { | |
e7b08eec AR |
930 | // There can be at most one PINNED destination. |
931 | // Non-PINNED destinations are uniquely identified by their CachePeer | |
932 | // (even though a DIRECT destination might match a cache_peer address). | |
933 | const bool duplicate = (server->code == PINNED) ? | |
cb835136 | 934 | (code == PINNED) : (server->_peer == peer); |
e7b08eec | 935 | if (duplicate) { |
cb835136 AR |
936 | debugs(44, 3, "skipping " << PeerSelectionDumper(this, peer, code) << |
937 | "; have " << PeerSelectionDumper(this, server->_peer.get(), server->code)); | |
e7b08eec AR |
938 | return; |
939 | } | |
cb835136 | 940 | serversTail = &server->next; |
e7b08eec | 941 | } |
62e76326 | 942 | |
cb835136 AR |
943 | debugs(44, 3, "adding " << PeerSelectionDumper(this, peer, code)); |
944 | *serversTail = new FwdServer(peer, code); | |
db1cd23c | 945 | } |
b24880fe | 946 | |
cb835136 | 947 | PeerSelector::PeerSelector(PeerSelectionInitiator *initiator): |
6043e368 | 948 | request(nullptr), |
f53969cc SM |
949 | entry (NULL), |
950 | always_direct(Config.accessList.AlwaysDirect?ACCESS_DUNNO:ACCESS_DENIED), | |
951 | never_direct(Config.accessList.NeverDirect?ACCESS_DUNNO:ACCESS_DENIED), | |
952 | direct(DIRECT_UNKNOWN), | |
f53969cc SM |
953 | lastError(NULL), |
954 | servers (NULL), | |
955 | first_parent_miss(), | |
956 | closest_parent_miss(), | |
957 | hit(NULL), | |
958 | hit_type(PEER_NONE), | |
6043e368 AR |
959 | acl_checklist (NULL), |
960 | initiator_(initiator) | |
b24880fe | 961 | { |
cc192b50 | 962 | ; // no local defaults. |
b24880fe | 963 | } |
964 | ||
851feda6 | 965 | const SBuf |
cb835136 | 966 | PeerSelector::url() const |
769c64cc AJ |
967 | { |
968 | if (entry) | |
851feda6 | 969 | return SBuf(entry->url()); |
769c64cc AJ |
970 | |
971 | if (request) | |
851feda6 | 972 | return request->effectiveRequestUri(); |
769c64cc | 973 | |
851feda6 AJ |
974 | static const SBuf noUrl("[no URL]"); |
975 | return noUrl; | |
769c64cc AJ |
976 | } |
977 | ||
6043e368 AR |
978 | /// \returns valid/interested peer initiator or nil |
979 | PeerSelectionInitiator * | |
cb835136 | 980 | PeerSelector::interestedInitiator() |
6043e368 AR |
981 | { |
982 | const auto initiator = initiator_.valid(); | |
983 | ||
984 | if (!initiator) { | |
985 | debugs(44, 3, id << " initiator gone"); | |
986 | return nullptr; | |
987 | } | |
988 | ||
989 | if (!initiator->subscribed) { | |
990 | debugs(44, 3, id << " initiator lost interest"); | |
991 | return nullptr; | |
992 | } | |
993 | ||
fd9c47d1 | 994 | debugs(44, 7, id); |
6043e368 AR |
995 | return initiator; |
996 | } | |
997 | ||
998 | bool | |
cb835136 | 999 | PeerSelector::wantsMoreDestinations() const { |
6043e368 AR |
1000 | const auto maxCount = Config.forward_max_tries; |
1001 | return maxCount >= 0 && foundPaths < | |
d22511f9 | 1002 | static_cast<std::make_unsigned<decltype(maxCount)>::type>(maxCount); |
6043e368 AR |
1003 | } |
1004 | ||
1005 | void | |
cb835136 | 1006 | PeerSelector::handlePath(Comm::ConnectionPointer &path, FwdServer &fs) |
6043e368 AR |
1007 | { |
1008 | ++foundPaths; | |
1009 | ||
1010 | path->peerType = fs.code; | |
1011 | path->setPeer(fs._peer.get()); | |
1012 | ||
1013 | // check for a configured outgoing address for this destination... | |
1014 | getOutgoingAddress(request, path); | |
1015 | ||
1016 | request->hier.ping = ping; // may be updated later | |
1017 | ||
1018 | debugs(44, 2, id << " found " << path << ", destination #" << foundPaths << " for " << url()); | |
1019 | debugs(44, 2, " always_direct = " << always_direct); | |
1020 | debugs(44, 2, " never_direct = " << never_direct); | |
1021 | debugs(44, 2, " timedout = " << ping.timedout); | |
1022 | ||
1023 | if (const auto initiator = interestedInitiator()) | |
1024 | initiator->noteDestination(path); | |
1025 | } | |
1026 | ||
cb835136 | 1027 | InstanceIdDefinitions(PeerSelector, "PeerSelector"); |
6043e368 | 1028 | |
b24880fe | 1029 | ping_data::ping_data() : |
f53969cc SM |
1030 | n_sent(0), |
1031 | n_recv(0), | |
1032 | n_replies_expected(0), | |
1033 | timeout(0), | |
1034 | timedout(0), | |
1035 | w_rtt(0), | |
1036 | p_rtt(0) | |
b24880fe | 1037 | { |
1038 | start.tv_sec = 0; | |
1039 | start.tv_usec = 0; | |
1040 | stop.tv_sec = 0; | |
1041 | stop.tv_usec = 0; | |
1042 | } | |
f53969cc | 1043 |