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307 lines
14 KiB
307 lines
14 KiB
5 years ago
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///
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/// Copyright 2015-2019 Oliver Giles
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///
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/// This file is part of Laminar
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///
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/// Laminar is free software: you can redistribute it and/or modify
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/// it under the terms of the GNU General Public License as published by
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/// the Free Software Foundation, either version 3 of the License, or
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/// (at your option) any later version.
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///
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/// Laminar is distributed in the hope that it will be useful,
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/// but WITHOUT ANY WARRANTY; without even the implied warranty of
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/// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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/// GNU General Public License for more details.
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///
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/// You should have received a copy of the GNU General Public License
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/// along with Laminar. If not, see <http://www.gnu.org/licenses/>
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///
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#include "interface.h"
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#include "http.h"
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#include "resources.h"
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#include "log.h"
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#include <kj/compat/http.h>
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#include <rapidjson/document.h>
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// This is the implementation of the HTTP/Websocket interface. It creates
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// websocket connections as LaminarClients and registers them with the
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// LaminarInterface so that status messages will be delivered to the client.
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// On opening a websocket connection, it delivers a status snapshot message
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// (see LaminarInterface::sendStatus)
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class HttpImpl : public kj::HttpService {
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public:
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HttpImpl(LaminarInterface& laminar, kj::HttpHeaderTable&tbl) :
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laminar(laminar),
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responseHeaders(tbl)
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{}
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virtual ~HttpImpl() {}
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private:
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class HttpChunkedClient : public LaminarClient {
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public:
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HttpChunkedClient(LaminarInterface& laminar) :
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laminar(laminar)
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{}
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~HttpChunkedClient() override {
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laminar.deregisterClient(this);
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}
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void sendMessage(std::string payload) override {
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chunks.push_back(kj::mv(payload));
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fulfiller->fulfill();
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}
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void notifyJobFinished() override {
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done = true;
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fulfiller->fulfill();
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}
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LaminarInterface& laminar;
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std::list<std::string> chunks;
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// cannot use chunks.empty() because multiple fulfill()s
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// could be coalesced
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bool done = false;
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kj::Own<kj::PromiseFulfiller<void>> fulfiller;
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};
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// Implements LaminarClient and holds the Websocket connection object.
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// Automatically destructed when the promise created in request() resolves
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// or is cancelled
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class WebsocketClient : public LaminarClient {
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public:
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WebsocketClient(LaminarInterface& laminar, kj::Own<kj::WebSocket>&& ws) :
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laminar(laminar),
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ws(kj::mv(ws))
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{}
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~WebsocketClient() override {
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laminar.deregisterClient(this);
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}
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virtual void sendMessage(std::string payload) override {
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messages.emplace_back(kj::mv(payload));
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// sendMessage might be called several times before the event loop
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// gets a chance to act on the fulfiller. So store the payload here
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// where it can be fetched later and don't pass the payload with the
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// fulfiller because subsequent calls to fulfill() are ignored.
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fulfiller->fulfill();
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}
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LaminarInterface& laminar;
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kj::Own<kj::WebSocket> ws;
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std::list<std::string> messages;
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kj::Own<kj::PromiseFulfiller<void>> fulfiller;
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};
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kj::Promise<void> websocketRead(WebsocketClient& lc)
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{
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return lc.ws->receive().then([&lc,this](kj::WebSocket::Message&& message) {
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KJ_SWITCH_ONEOF(message) {
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KJ_CASE_ONEOF(str, kj::String) {
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rapidjson::Document d;
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d.ParseInsitu(const_cast<char*>(str.cStr()));
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if(d.HasMember("page") && d["page"].IsInt() && d.HasMember("field") && d["field"].IsString() && d.HasMember("order") && d["order"].IsString()) {
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lc.scope.page = d["page"].GetInt();
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lc.scope.field = d["field"].GetString();
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lc.scope.order_desc = strcmp(d["order"].GetString(), "dsc") == 0;
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laminar.sendStatus(&lc);
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return websocketRead(lc);
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}
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}
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KJ_CASE_ONEOF(close, kj::WebSocket::Close) {
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// clean socket shutdown
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return lc.ws->close(close.code, close.reason);
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}
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KJ_CASE_ONEOF_DEFAULT {}
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}
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// unhandled/unknown message
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return lc.ws->disconnect();
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}, [](kj::Exception&& e){
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// server logs suggest early catching here avoids fatal exception later
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// TODO: reproduce in unit test
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LLOG(WARNING, e.getDescription());
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return kj::READY_NOW;
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});
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}
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kj::Promise<void> websocketWrite(WebsocketClient& lc)
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{
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auto paf = kj::newPromiseAndFulfiller<void>();
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lc.fulfiller = kj::mv(paf.fulfiller);
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return paf.promise.then([this,&lc]{
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kj::Promise<void> p = kj::READY_NOW;
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std::list<std::string> messages = kj::mv(lc.messages);
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for(std::string& s : messages) {
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p = p.then([&s,&lc]{
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kj::String str = kj::str(s);
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return lc.ws->send(str).attach(kj::mv(str));
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});
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}
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return p.attach(kj::mv(messages)).then([this,&lc]{
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return websocketWrite(lc);
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});
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});
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}
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kj::Promise<void> websocketUpgraded(WebsocketClient& lc, std::string resource) {
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// convert the requested URL to a MonitorScope
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if(resource.substr(0, 5) == "/jobs") {
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if(resource.length() == 5) {
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lc.scope.type = MonitorScope::ALL;
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} else {
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resource = resource.substr(5);
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size_t split = resource.find('/',1);
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std::string job = resource.substr(1,split-1);
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if(!job.empty()) {
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lc.scope.job = job;
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lc.scope.type = MonitorScope::JOB;
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}
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if(split != std::string::npos) {
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size_t split2 = resource.find('/', split+1);
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std::string run = resource.substr(split+1, split2-split);
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if(!run.empty()) {
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lc.scope.num = static_cast<uint>(atoi(run.c_str()));
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lc.scope.type = MonitorScope::RUN;
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}
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if(split2 != std::string::npos && resource.compare(split2, 4, "/log") == 0) {
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lc.scope.type = MonitorScope::LOG;
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}
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}
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}
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}
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laminar.registerClient(&lc);
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kj::Promise<void> connection = websocketRead(lc).exclusiveJoin(websocketWrite(lc));
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// registerClient can happen after a successful websocket handshake.
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// However, the connection might not be closed gracefully, so the
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// corresponding deregister operation happens in the WebsocketClient
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// destructor rather than the close handler or a then() clause
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laminar.sendStatus(&lc);
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return connection;
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}
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// Parses the url of the form /log/NAME/NUMBER, filling in the passed
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// references and returning true if successful. /log/NAME/latest is
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// also allowed, in which case the num reference is set to 0
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bool parseLogEndpoint(kj::StringPtr url, std::string& name, uint& num) {
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if(url.startsWith("/log/")) {
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kj::StringPtr path = url.slice(5);
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KJ_IF_MAYBE(sep, path.findFirst('/')) {
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name = path.slice(0, *sep).begin();
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kj::StringPtr tail = path.slice(*sep+1);
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num = static_cast<uint>(atoi(tail.begin()));
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name.erase(*sep);
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if(tail == "latest")
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num = laminar.latestRun(name);
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if(num > 0)
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return true;
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}
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}
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return false;
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}
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kj::Promise<void> writeLogChunk(HttpChunkedClient* client, kj::AsyncOutputStream* stream) {
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auto paf = kj::newPromiseAndFulfiller<void>();
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client->fulfiller = kj::mv(paf.fulfiller);
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return paf.promise.then([=]{
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kj::Promise<void> p = kj::READY_NOW;
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std::list<std::string> chunks = kj::mv(client->chunks);
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for(std::string& s : chunks) {
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p = p.then([=,&s]{
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return stream->write(s.data(), s.size());
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});
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}
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return p.attach(kj::mv(chunks)).then([=]{
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return client->done ? kj::Promise<void>(kj::READY_NOW) : writeLogChunk(client, stream);
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});
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});
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}
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virtual kj::Promise<void> request(kj::HttpMethod method, kj::StringPtr url, const kj::HttpHeaders& headers,
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kj::AsyncInputStream& requestBody, Response& response) override
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{
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if(headers.isWebSocket()) {
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responseHeaders.clear();
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kj::Own<WebsocketClient> lc = kj::heap<WebsocketClient>(laminar, response.acceptWebSocket(responseHeaders));
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return websocketUpgraded(*lc, url.cStr()).attach(kj::mv(lc));
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} else {
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// handle regular HTTP request
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const char* start, *end, *content_type;
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std::string badge;
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// for log requests
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std::string name;
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uint num;
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responseHeaders.clear();
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// Clients usually expect that http servers will ignore unknown query parameters,
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// and expect to use this feature to work around browser limitations like there
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// being no way to programatically force a resource to be reloaded from the server
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// (without "Cache-Control: no-store", which is overkill). See issue #89.
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// Since we currently don't handle any query parameters at all, the easiest way
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// to achieve this is unconditionally remove all query parameters from the request.
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// This will need to be redone if we ever accept query parameters, which probably
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// will happen as part of issue #90.
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KJ_IF_MAYBE(queryIdx, url.findFirst('?')) {
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const_cast<char*>(url.begin())[*queryIdx] = '\0';
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url = url.begin();
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}
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if(url.startsWith("/archive/")) {
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KJ_IF_MAYBE(file, laminar.getArtefact(url.slice(strlen("/archive/")))) {
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auto array = (*file)->mmap(0, (*file)->stat().size);
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responseHeaders.add("Content-Transfer-Encoding", "binary");
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auto stream = response.send(200, "OK", responseHeaders, array.size());
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return stream->write(array.begin(), array.size()).attach(kj::mv(array)).attach(kj::mv(file)).attach(kj::mv(stream));
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}
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} else if(parseLogEndpoint(url, name, num)) {
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kj::Own<HttpChunkedClient> cc = kj::heap<HttpChunkedClient>(laminar);
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cc->scope.job = name;
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cc->scope.num = num;
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bool complete;
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std::string output;
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cc->scope.type = MonitorScope::LOG;
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if(laminar.handleLogRequest(name, num, output, complete)) {
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responseHeaders.set(kj::HttpHeaderId::CONTENT_TYPE, "text/plain; charset=utf-8");
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responseHeaders.add("Content-Transfer-Encoding", "binary");
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// Disables nginx reverse-proxy's buffering. Necessary for dynamic log output.
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responseHeaders.add("X-Accel-Buffering", "no");
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auto stream = response.send(200, "OK", responseHeaders, nullptr);
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laminar.registerClient(cc.get());
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return stream->write(output.data(), output.size()).then([=,s=stream.get(),c=cc.get()]{
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if(complete)
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return kj::Promise<void>(kj::READY_NOW);
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return writeLogChunk(c, s);
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}).attach(kj::mv(output)).attach(kj::mv(stream)).attach(kj::mv(cc));
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}
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} else if(url == "/custom/style.css") {
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responseHeaders.set(kj::HttpHeaderId::CONTENT_TYPE, "text/css; charset=utf-8");
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responseHeaders.add("Content-Transfer-Encoding", "binary");
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std::string css = laminar.getCustomCss();
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auto stream = response.send(200, "OK", responseHeaders, css.size());
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return stream->write(css.data(), css.size()).attach(kj::mv(css)).attach(kj::mv(stream));
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} else if(resources.handleRequest(url.cStr(), &start, &end, &content_type)) {
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responseHeaders.set(kj::HttpHeaderId::CONTENT_TYPE, content_type);
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responseHeaders.add("Content-Encoding", "gzip");
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responseHeaders.add("Content-Transfer-Encoding", "binary");
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auto stream = response.send(200, "OK", responseHeaders, end-start);
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return stream->write(start, end-start).attach(kj::mv(stream));
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} else if(url.startsWith("/badge/") && url.endsWith(".svg") && laminar.handleBadgeRequest(std::string(url.begin()+7, url.size()-11), badge)) {
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responseHeaders.set(kj::HttpHeaderId::CONTENT_TYPE, "image/svg+xml");
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responseHeaders.add("Cache-Control", "no-cache");
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auto stream = response.send(200, "OK", responseHeaders, badge.size());
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return stream->write(badge.data(), badge.size()).attach(kj::mv(badge)).attach(kj::mv(stream));
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}
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return response.sendError(404, "Not Found", responseHeaders);
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}
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}
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LaminarInterface& laminar;
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Resources resources;
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kj::HttpHeaders responseHeaders;
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};
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Http::Http(LaminarInterface &li) :
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headerTable(kj::heap<kj::HttpHeaderTable>()),
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httpService(kj::heap<HttpImpl>(li, *headerTable)),
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laminar(li)
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{
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}
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kj::Promise<void> Http::startServer(kj::Timer& timer, kj::Own<kj::ConnectionReceiver>&& listener) {
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auto httpServer = kj::heap<kj::HttpServer>(timer, *headerTable, *httpService);
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return httpServer->listenHttp(*listener).attach(kj::mv(listener)).attach(kj::mv(httpServer));
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}
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