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28 #ifndef TALK_BASE_HTTPCLIENT_H__
29 #define TALK_BASE_HTTPCLIENT_H__
31 #include "talk/base/common.h"
32 #include "talk/base/httpbase.h"
33 #include "talk/base/nethelpers.h"
34 #include "talk/base/proxyinfo.h"
35 #include "talk/base/scoped_ptr.h"
36 #include "talk/base/sigslot.h"
37 #include "talk/base/socketaddress.h"
38 #include "talk/base/socketpool.h"
42 //////////////////////////////////////////////////////////////////////
43 // Client-specific http utilities
44 //////////////////////////////////////////////////////////////////////
46 // Write cache-relevant response headers to output stream. If size is non-null,
47 // it contains the length of the output in bytes. output may be null if only
48 // the length is desired.
49 bool HttpWriteCacheHeaders(const HttpResponseData* response,
50 StreamInterface* output, size_t* size);
51 // Read cached headers from a stream, and them merge them into the response
52 // object using the specified combine operation.
53 bool HttpReadCacheHeaders(StreamInterface* input,
54 HttpResponseData* response,
55 HttpData::HeaderCombine combine);
57 //////////////////////////////////////////////////////////////////////
59 // Implements an HTTP 1.1 client.
60 //////////////////////////////////////////////////////////////////////
67 // What to do: Define STRICT_HTTP_ERROR=1 in your makefile. Use HttpError in
68 // your code (HttpErrorType should only be used for code that is shared
69 // with groups which have not yet migrated).
71 typedef HttpError HttpErrorType;
72 #else // !STRICT_HTTP_ERROR
73 typedef int HttpErrorType;
74 #endif // !STRICT_HTTP_ERROR
76 class HttpClient : private IHttpNotify, public sigslot::has_slots<> {
78 // If HttpRequestData and HttpResponseData objects are provided, they must
79 // be freed by the caller. Otherwise, an internal object is allocated.
80 HttpClient(const std::string& agent, StreamPool* pool,
81 HttpTransaction* transaction = NULL);
82 virtual ~HttpClient();
84 void set_pool(StreamPool* pool) { pool_ = pool; }
86 void set_agent(const std::string& agent) { agent_ = agent; }
87 const std::string& agent() const { return agent_; }
89 void set_proxy(const ProxyInfo& proxy) { proxy_ = proxy; }
90 const ProxyInfo& proxy() const { return proxy_; }
92 // Request retries occur when the connection closes before the beginning of
93 // an http response is received. In these cases, the http server may have
94 // timed out the keepalive connection before it received our request. Note
95 // that if a request document cannot be rewound, no retry is made. The
97 void set_request_retries(size_t retries) { retries_ = retries; }
98 size_t request_retries() const { return retries_; }
100 enum RedirectAction { REDIRECT_DEFAULT, REDIRECT_ALWAYS, REDIRECT_NEVER };
101 void set_redirect_action(RedirectAction action) { redirect_action_ = action; }
102 RedirectAction redirect_action() const { return redirect_action_; }
104 void set_fail_redirect(bool fail_redirect) {
105 redirect_action_ = REDIRECT_NEVER;
107 bool fail_redirect() const { return (REDIRECT_NEVER == redirect_action_); }
109 enum UriForm { URI_DEFAULT, URI_ABSOLUTE, URI_RELATIVE };
110 void set_uri_form(UriForm form) { uri_form_ = form; }
111 UriForm uri_form() const { return uri_form_; }
113 void set_cache(DiskCache* cache) { ASSERT(!IsCacheActive()); cache_ = cache; }
114 bool cache_enabled() const { return (NULL != cache_); }
116 // reset clears the server, request, and response structures. It will also
117 // abort an active request.
120 void set_server(const SocketAddress& address);
121 const SocketAddress& server() const { return server_; }
123 // Note: in order for HttpClient to retry a POST in response to
124 // an authentication challenge, a redirect response, or socket disconnection,
125 // the request document must support 'replaying' by calling Rewind() on it.
126 // In the case where just a subset of a stream should be used as the request
127 // document, the stream may be wrapped with the StreamSegment adapter.
128 HttpTransaction* transaction() { return transaction_; }
129 const HttpTransaction* transaction() const { return transaction_; }
130 HttpRequestData& request() { return transaction_->request; }
131 const HttpRequestData& request() const { return transaction_->request; }
132 HttpResponseData& response() { return transaction_->response; }
133 const HttpResponseData& response() const { return transaction_->response; }
135 // convenience methods
136 void prepare_get(const std::string& url);
137 void prepare_post(const std::string& url, const std::string& content_type,
138 StreamInterface* request_doc);
140 // Convert HttpClient to a pull-based I/O model.
141 StreamInterface* GetDocumentStream();
143 // After you finish setting up your request, call start.
146 // Signalled when the header has finished downloading, before the document
147 // content is processed. You may change the response document in response
148 // to this signal. The second parameter indicates whether this is an
149 // intermediate (false) or final (true) header. An intermediate header is
150 // one that generates another request, such as a redirect or authentication
151 // challenge. The third parameter indicates the length of the response
152 // document, or else SIZE_UNKNOWN. Note: Do NOT abort the request in response
154 sigslot::signal3<HttpClient*,bool,size_t> SignalHeaderAvailable;
155 // Signalled when the current request finishes. On success, err is 0.
156 sigslot::signal2<HttpClient*,HttpErrorType> SignalHttpClientComplete;
162 bool ShouldRedirect(std::string* location) const;
164 bool BeginCacheFile();
165 HttpError WriteCacheHeaders(const std::string& id);
166 void CompleteCacheFile();
169 HttpError ReadCacheHeaders(const std::string& id, bool override);
170 HttpError ReadCacheBody(const std::string& id);
172 bool PrepareValidate();
173 HttpError CompleteValidate();
175 HttpError OnHeaderAvailable(bool ignore_data, bool chunked, size_t data_size);
177 void StartDNSLookup();
178 void OnResolveResult(AsyncResolverInterface* resolver);
180 // IHttpNotify Interface
181 virtual HttpError onHttpHeaderComplete(bool chunked, size_t& data_size);
182 virtual void onHttpComplete(HttpMode mode, HttpError err);
183 virtual void onHttpClosed(HttpError err);
186 enum CacheState { CS_READY, CS_WRITING, CS_READING, CS_VALIDATING };
187 bool IsCacheActive() const { return (cache_state_ > CS_READY); }
192 SocketAddress server_;
194 HttpTransaction* transaction_;
195 bool free_transaction_;
196 size_t retries_, attempt_, redirects_;
197 RedirectAction redirect_action_;
199 scoped_ptr<HttpAuthContext> context_;
201 CacheState cache_state_;
202 AsyncResolverInterface* resolver_;
205 //////////////////////////////////////////////////////////////////////
206 // HttpClientDefault - Default implementation of HttpClient
207 //////////////////////////////////////////////////////////////////////
209 class HttpClientDefault : public ReuseSocketPool, public HttpClient {
211 HttpClientDefault(SocketFactory* factory, const std::string& agent,
212 HttpTransaction* transaction = NULL);
215 //////////////////////////////////////////////////////////////////////
217 } // namespace talk_base
219 #endif // TALK_BASE_HTTPCLIENT_H__