/root/bitcoin/src/httpserver.h

Source (jump to first uncovered line)
// Copyright (c) 2015-2022 The Bitcoin Core developers
// Distributed under the MIT software license, see the accompanying
// file COPYING or http://www.opensource.org/licenses/mit-license.php.

#ifndef BITCOIN_HTTPSERVER_H
#define BITCOIN_HTTPSERVER_H

#include <functional>
#include <optional>
#include <span>
#include <string>

namespace util {
class SignalInterrupt;
} // namespace util

static const int DEFAULT_HTTP_THREADS=4;
static const int DEFAULT_HTTP_WORKQUEUE=16;
static const int DEFAULT_HTTP_SERVER_TIMEOUT=30;

struct evhttp_request;
struct event_base;
class CService;
class HTTPRequest;

/** Initialize HTTP server.
 * Call this before RegisterHTTPHandler or EventBase().
 */
bool InitHTTPServer(const util::SignalInterrupt& interrupt);
/** Start HTTP server.
 * This is separate from InitHTTPServer to give users race-condition-free time
 * to register their handlers between InitHTTPServer and StartHTTPServer.
 */
void StartHTTPServer();
/** Interrupt HTTP server threads */
void InterruptHTTPServer();
/** Stop HTTP server */
void StopHTTPServer();

/** Change logging level for libevent. */
void UpdateHTTPServerLogging(bool enable);

/** Handler for requests to a certain HTTP path */
typedef std::function<bool(HTTPRequest* req, const std::string &)> HTTPRequestHandler;
/** Register handler for prefix.
 * If multiple handlers match a prefix, the first-registered one will
 * be invoked.
 */
void RegisterHTTPHandler(const std::string &prefix, bool exactMatch, const HTTPRequestHandler &handler);
/** Unregister handler for prefix */
void UnregisterHTTPHandler(const std::string &prefix, bool exactMatch);

/** Return evhttp event base. This can be used by submodules to
 * queue timers or custom events.
 */
struct event_base* EventBase();

/** In-flight HTTP request.
 * Thin C++ wrapper around evhttp_request.
 */
class HTTPRequest
{
private:
    struct evhttp_request* req;
    const util::SignalInterrupt& m_interrupt;
    bool replySent;

public:
    explicit HTTPRequest(struct evhttp_request* req, const util::SignalInterrupt& interrupt, bool replySent = false);
    ~HTTPRequest();

    enum RequestMethod {
        UNKNOWN,
        GET,
        POST,
        HEAD,
        PUT
    };

    /** Get requested URI.
     */
    std::string GetURI() const;

    /** Get CService (address:ip) for the origin of the http request.
     */
    CService GetPeer() const;

    /** Get request method.
     */
    RequestMethod GetRequestMethod() const;

    /** Get the query parameter value from request uri for a specified key, or std::nullopt if the
     * key is not found.
     *
     * If the query string contains duplicate keys, the first value is returned. Many web frameworks
     * would instead parse this as an array of values, but this is not (yet) implemented as it is
     * currently not needed in any of the endpoints.
     *
     * @param[in] key represents the query parameter of which the value is returned
     */
    std::optional<std::string> GetQueryParameter(const std::string& key) const;

    /**
     * Get the request header specified by hdr, or an empty string.
     * Return a pair (isPresent,string).
     */
    std::pair<bool, std::string> GetHeader(const std::string& hdr) const;

    /**
     * Read request body.
     *
     * @note As this consumes the underlying buffer, call this only once.
     * Repeated calls will return an empty string.
     */
    std::string ReadBody();

    /**
     * Write output header.
     *
     * @note call this before calling WriteErrorReply or Reply.
     */
    void WriteHeader(const std::string& hdr, const std::string& value);

    /**
     * Write HTTP reply.
     * nStatus is the HTTP status code to send.
     * reply is the body of the reply. Keep it empty to send a standard message.
     *
     * @note Can be called only once. As this will give the request back to the
     * main thread, do not call any other HTTPRequest methods after calling this.
     */
    void WriteReply(int nStatus, std::string_view reply = "")
    {
        WriteReply(nStatus, std::as_bytes(std::span{reply}));
    }
    void WriteReply(int nStatus, std::span<const std::byte> reply);
};

/** Get the query parameter value from request uri for a specified key, or std::nullopt if the key
 * is not found.
 *
 * If the query string contains duplicate keys, the first value is returned. Many web frameworks
 * would instead parse this as an array of values, but this is not (yet) implemented as it is
 * currently not needed in any of the endpoints.
 *
 * Helper function for HTTPRequest::GetQueryParameter.
 *
 * @param[in] uri is the entire request uri
 * @param[in] key represents the query parameter of which the value is returned
 */
std::optional<std::string> GetQueryParameterFromUri(const char* uri, const std::string& key);

/** Event handler closure.
 */
class HTTPClosure
{
public:
    virtual void operator()() = 0;
    virtual ~HTTPClosure() = default;
};

/** Event class. This can be used either as a cross-thread trigger or as a timer.
 */
class HTTPEvent
{
public:
    /** Create a new event.
     * deleteWhenTriggered deletes this event object after the event is triggered (and the handler called)
     * handler is the handler to call when the event is triggered.
     */
    HTTPEvent(struct event_base* base, bool deleteWhenTriggered, const std::function<void()>& handler);
    ~HTTPEvent();

    /** Trigger the event. If tv is 0, trigger it immediately. Otherwise trigger it after
     * the given time has elapsed.
     */
    void trigger(struct timeval* tv);

    bool deleteWhenTriggered;
    std::function<void()> handler;
private:
    struct event* ev;
};

#endif // BITCOIN_HTTPSERVER_H

Line	Count	Source (jump to first uncovered line)
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 <span>
11		#include <string>
12
13		namespace util {
14		class SignalInterrupt;
15		} // namespace util
16
17		static const int DEFAULT_HTTP_THREADS=4;
18		static const int DEFAULT_HTTP_WORKQUEUE=16;
19		static const int DEFAULT_HTTP_SERVER_TIMEOUT=30;
20
21		struct evhttp_request;
22		struct event_base;
23		class CService;
24		class HTTPRequest;
25
26		/** Initialize HTTP server.
27		* Call this before RegisterHTTPHandler or EventBase().
28		*/
29		bool InitHTTPServer(const util::SignalInterrupt& interrupt);
30		/** Start HTTP server.
31		* This is separate from InitHTTPServer to give users race-condition-free time
32		* to register their handlers between InitHTTPServer and StartHTTPServer.
33		*/
34		void StartHTTPServer();
35		/** Interrupt HTTP server threads */
36		void InterruptHTTPServer();
37		/** Stop HTTP server */
38		void StopHTTPServer();
39
40		/** Change logging level for libevent. */
41		void UpdateHTTPServerLogging(bool enable);
42
43		/** Handler for requests to a certain HTTP path */
44		typedef std::function<bool(HTTPRequest* req, const std::string &)> HTTPRequestHandler;
45		/** Register handler for prefix.
46		* If multiple handlers match a prefix, the first-registered one will
47		* be invoked.
48		*/
49		void RegisterHTTPHandler(const std::string &prefix, bool exactMatch, const HTTPRequestHandler &handler);
50		/** Unregister handler for prefix */
51		void UnregisterHTTPHandler(const std::string &prefix, bool exactMatch);
52
53		/** Return evhttp event base. This can be used by submodules to
54		* queue timers or custom events.
55		*/
56		struct event_base* EventBase();
57
58		/** In-flight HTTP request.
59		* Thin C++ wrapper around evhttp_request.
60		*/
61		class HTTPRequest
62		{
63		private:
64		struct evhttp_request* req;
65		const util::SignalInterrupt& m_interrupt;
66		bool replySent;
67
68		public:
69		explicit HTTPRequest(struct evhttp_request* req, const util::SignalInterrupt& interrupt, bool replySent = false);
70		~HTTPRequest();
71
72		enum RequestMethod {
73		UNKNOWN,
74		GET,
75		POST,
76		HEAD,
77		PUT
78		};
79
80		/** Get requested URI.
81		*/
82		std::string GetURI() const;
83
84		/** Get CService (address:ip) for the origin of the http request.
85		*/
86		CService GetPeer() const;
87
88		/** Get request method.
89		*/
90		RequestMethod GetRequestMethod() const;
91
92		/** Get the query parameter value from request uri for a specified key, or std::nullopt if the
93		* key is not found.
94		*
95		* If the query string contains duplicate keys, the first value is returned. Many web frameworks
96		* would instead parse this as an array of values, but this is not (yet) implemented as it is
97		* currently not needed in any of the endpoints.
98		*
99		* @param[in] key represents the query parameter of which the value is returned
100		*/
101		std::optional<std::string> GetQueryParameter(const std::string& key) const;
102
103		/**
104		* Get the request header specified by hdr, or an empty string.
105		* Return a pair (isPresent,string).
106		*/
107		std::pair<bool, std::string> GetHeader(const std::string& hdr) const;
108
109		/**
110		* Read request body.
111		*
112		* @note As this consumes the underlying buffer, call this only once.
113		* Repeated calls will return an empty string.
114		*/
115		std::string ReadBody();
116
117		/**
118		* Write output header.
119		*
120		* @note call this before calling WriteErrorReply or Reply.
121		*/
122		void WriteHeader(const std::string& hdr, const std::string& value);
123
124		/**
125		* Write HTTP reply.
126		* nStatus is the HTTP status code to send.
127		* reply is the body of the reply. Keep it empty to send a standard message.
128		*
129		* @note Can be called only once. As this will give the request back to the
130		* main thread, do not call any other HTTPRequest methods after calling this.
131		*/
132		void WriteReply(int nStatus, std::string_view reply = "")
133	0	{
134	0	WriteReply(nStatus, std::as_bytes(std::span{reply}));
135	0	}
136		void WriteReply(int nStatus, std::span<const std::byte> reply);
137		};
138
139		/** Get the query parameter value from request uri for a specified key, or std::nullopt if the key
140		* is not found.
141		*
142		* If the query string contains duplicate keys, the first value is returned. Many web frameworks
143		* would instead parse this as an array of values, but this is not (yet) implemented as it is
144		* currently not needed in any of the endpoints.
145		*
146		* Helper function for HTTPRequest::GetQueryParameter.
147		*
148		* @param[in] uri is the entire request uri
149		* @param[in] key represents the query parameter of which the value is returned
150		*/
151		std::optional<std::string> GetQueryParameterFromUri(const char* uri, const std::string& key);
152
153		/** Event handler closure.
154		*/
155		class HTTPClosure
156		{
157		public:
158		virtual void operator()() = 0;
159	0	virtual ~HTTPClosure() = default;
160		};
161
162		/** Event class. This can be used either as a cross-thread trigger or as a timer.
163		*/
164		class HTTPEvent
165		{
166		public:
167		/** Create a new event.
168		* deleteWhenTriggered deletes this event object after the event is triggered (and the handler called)
169		* handler is the handler to call when the event is triggered.
170		*/
171		HTTPEvent(struct event_base* base, bool deleteWhenTriggered, const std::function<void()>& handler);
172		~HTTPEvent();
173
174		/** Trigger the event. If tv is 0, trigger it immediately. Otherwise trigger it after
175		* the given time has elapsed.
176		*/
177		void trigger(struct timeval* tv);
178
179		bool deleteWhenTriggered;
180		std::function<void()> handler;
181		private:
182		struct event* ev;
183		};
184
185		#endif // BITCOIN_HTTPSERVER_H

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Created: 2024-11-15 12:18