LCOV - code coverage report
Current view: top level - src - httpserver.h (source / functions) Hit Total Coverage
Test: fuzz_coverage.info Lines: 0 2 0.0 %
Date: 2023-11-06 23:13:05 Functions: 0 3 0.0 %
Branches: 0 0 -

           Branch data     Line data    Source code
       1                 :            : // Copyright (c) 2015-2022 The Bitcoin Core developers
       2                 :            : // Distributed under the MIT software license, see the accompanying
       3                 :            : // file COPYING or http://www.opensource.org/licenses/mit-license.php.
       4                 :            : 
       5                 :            : #ifndef BITCOIN_HTTPSERVER_H
       6                 :            : #define BITCOIN_HTTPSERVER_H
       7                 :            : 
       8                 :            : #include <functional>
       9                 :            : #include <optional>
      10                 :            : #include <string>
      11                 :            : 
      12                 :            : static const int DEFAULT_HTTP_THREADS=4;
      13                 :            : static const int DEFAULT_HTTP_WORKQUEUE=16;
      14                 :            : static const int DEFAULT_HTTP_SERVER_TIMEOUT=30;
      15                 :            : 
      16                 :            : struct evhttp_request;
      17                 :            : struct event_base;
      18                 :            : class CService;
      19                 :            : class HTTPRequest;
      20                 :            : 
      21                 :            : /** Initialize HTTP server.
      22                 :            :  * Call this before RegisterHTTPHandler or EventBase().
      23                 :            :  */
      24                 :            : bool InitHTTPServer();
      25                 :            : /** Start HTTP server.
      26                 :            :  * This is separate from InitHTTPServer to give users race-condition-free time
      27                 :            :  * to register their handlers between InitHTTPServer and StartHTTPServer.
      28                 :            :  */
      29                 :            : void StartHTTPServer();
      30                 :            : /** Interrupt HTTP server threads */
      31                 :            : void InterruptHTTPServer();
      32                 :            : /** Stop HTTP server */
      33                 :            : void StopHTTPServer();
      34                 :            : 
      35                 :            : /** Change logging level for libevent. */
      36                 :            : void UpdateHTTPServerLogging(bool enable);
      37                 :            : 
      38                 :            : /** Handler for requests to a certain HTTP path */
      39                 :            : typedef std::function<bool(HTTPRequest* req, const std::string &)> HTTPRequestHandler;
      40                 :            : /** Register handler for prefix.
      41                 :            :  * If multiple handlers match a prefix, the first-registered one will
      42                 :            :  * be invoked.
      43                 :            :  */
      44                 :            : void RegisterHTTPHandler(const std::string &prefix, bool exactMatch, const HTTPRequestHandler &handler);
      45                 :            : /** Unregister handler for prefix */
      46                 :            : void UnregisterHTTPHandler(const std::string &prefix, bool exactMatch);
      47                 :            : 
      48                 :            : /** Return evhttp event base. This can be used by submodules to
      49                 :            :  * queue timers or custom events.
      50                 :            :  */
      51                 :            : struct event_base* EventBase();
      52                 :            : 
      53                 :            : /** In-flight HTTP request.
      54                 :            :  * Thin C++ wrapper around evhttp_request.
      55                 :            :  */
      56                 :            : class HTTPRequest
      57                 :            : {
      58                 :            : private:
      59                 :            :     struct evhttp_request* req;
      60                 :            :     bool replySent;
      61                 :            : 
      62                 :            : public:
      63                 :            :     explicit HTTPRequest(struct evhttp_request* req, bool replySent = false);
      64                 :            :     ~HTTPRequest();
      65                 :            : 
      66                 :            :     enum RequestMethod {
      67                 :            :         UNKNOWN,
      68                 :            :         GET,
      69                 :            :         POST,
      70                 :            :         HEAD,
      71                 :            :         PUT
      72                 :            :     };
      73                 :            : 
      74                 :            :     /** Get requested URI.
      75                 :            :      */
      76                 :            :     std::string GetURI() const;
      77                 :            : 
      78                 :            :     /** Get CService (address:ip) for the origin of the http request.
      79                 :            :      */
      80                 :            :     CService GetPeer() const;
      81                 :            : 
      82                 :            :     /** Get request method.
      83                 :            :      */
      84                 :            :     RequestMethod GetRequestMethod() const;
      85                 :            : 
      86                 :            :     /** Get the query parameter value from request uri for a specified key, or std::nullopt if the
      87                 :            :      * key is not found.
      88                 :            :      *
      89                 :            :      * If the query string contains duplicate keys, the first value is returned. Many web frameworks
      90                 :            :      * would instead parse this as an array of values, but this is not (yet) implemented as it is
      91                 :            :      * currently not needed in any of the endpoints.
      92                 :            :      *
      93                 :            :      * @param[in] key represents the query parameter of which the value is returned
      94                 :            :      */
      95                 :            :     std::optional<std::string> GetQueryParameter(const std::string& key) const;
      96                 :            : 
      97                 :            :     /**
      98                 :            :      * Get the request header specified by hdr, or an empty string.
      99                 :            :      * Return a pair (isPresent,string).
     100                 :            :      */
     101                 :            :     std::pair<bool, std::string> GetHeader(const std::string& hdr) const;
     102                 :            : 
     103                 :            :     /**
     104                 :            :      * Read request body.
     105                 :            :      *
     106                 :            :      * @note As this consumes the underlying buffer, call this only once.
     107                 :            :      * Repeated calls will return an empty string.
     108                 :            :      */
     109                 :            :     std::string ReadBody();
     110                 :            : 
     111                 :            :     /**
     112                 :            :      * Write output header.
     113                 :            :      *
     114                 :            :      * @note call this before calling WriteErrorReply or Reply.
     115                 :            :      */
     116                 :            :     void WriteHeader(const std::string& hdr, const std::string& value);
     117                 :            : 
     118                 :            :     /**
     119                 :            :      * Write HTTP reply.
     120                 :            :      * nStatus is the HTTP status code to send.
     121                 :            :      * strReply is the body of the reply. Keep it empty to send a standard message.
     122                 :            :      *
     123                 :            :      * @note Can be called only once. As this will give the request back to the
     124                 :            :      * main thread, do not call any other HTTPRequest methods after calling this.
     125                 :            :      */
     126                 :            :     void WriteReply(int nStatus, const std::string& strReply = "");
     127                 :            : };
     128                 :            : 
     129                 :            : /** Get the query parameter value from request uri for a specified key, or std::nullopt if the key
     130                 :            :  * is not found.
     131                 :            :  *
     132                 :            :  * If the query string contains duplicate keys, the first value is returned. Many web frameworks
     133                 :            :  * would instead parse this as an array of values, but this is not (yet) implemented as it is
     134                 :            :  * currently not needed in any of the endpoints.
     135                 :            :  *
     136                 :            :  * Helper function for HTTPRequest::GetQueryParameter.
     137                 :            :  *
     138                 :            :  * @param[in] uri is the entire request uri
     139                 :            :  * @param[in] key represents the query parameter of which the value is returned
     140                 :            :  */
     141                 :            : std::optional<std::string> GetQueryParameterFromUri(const char* uri, const std::string& key);
     142                 :            : 
     143                 :            : /** Event handler closure.
     144                 :            :  */
     145                 :          0 : class HTTPClosure
     146                 :            : {
     147                 :            : public:
     148                 :            :     virtual void operator()() = 0;
     149                 :          0 :     virtual ~HTTPClosure() {}
     150                 :            : };
     151                 :            : 
     152                 :            : /** Event class. This can be used either as a cross-thread trigger or as a timer.
     153                 :            :  */
     154                 :            : class HTTPEvent
     155                 :            : {
     156                 :            : public:
     157                 :            :     /** Create a new event.
     158                 :            :      * deleteWhenTriggered deletes this event object after the event is triggered (and the handler called)
     159                 :            :      * handler is the handler to call when the event is triggered.
     160                 :            :      */
     161                 :            :     HTTPEvent(struct event_base* base, bool deleteWhenTriggered, const std::function<void()>& handler);
     162                 :            :     ~HTTPEvent();
     163                 :            : 
     164                 :            :     /** Trigger the event. If tv is 0, trigger it immediately. Otherwise trigger it after
     165                 :            :      * the given time has elapsed.
     166                 :            :      */
     167                 :            :     void trigger(struct timeval* tv);
     168                 :            : 
     169                 :            :     bool deleteWhenTriggered;
     170                 :            :     std::function<void()> handler;
     171                 :            : private:
     172                 :            :     struct event* ev;
     173                 :            : };
     174                 :            : 
     175                 :            : #endif // BITCOIN_HTTPSERVER_H

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