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XrdTpcState.hh
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1
6#ifndef __XRD_TPC_STATE_HH__
7#define __XRD_TPC_STATE_HH__
8
9#include <memory>
10#include <vector>
11
12// Forward dec'ls
13class XrdSfsFile;
14class XrdHttpExtReq;
15typedef void CURL;
16struct curl_slist;
17
18namespace TPC {
19class Stream;
20
21class State {
22public:
23
25 m_push(true),
26 m_recv_status_line(false),
27 m_recv_all_headers(false),
28 m_offset(0),
29 m_start_offset(0),
30 m_status_code(-1),
31 m_error_code(0),
32 m_content_length(-1),
33 m_stream(NULL),
34 m_curl(NULL),
35 m_headers(NULL),
36 m_is_transfer_state(true)
37 {}
38
43 State(CURL * curl, bool tpcForwardCreds):
44 m_push(true),
45 m_recv_status_line(false),
46 m_recv_all_headers(false),
47 m_offset(0),
48 m_start_offset(0),
49 m_status_code(-1),
50 m_error_code(0),
51 m_content_length(-1),
52 m_stream(NULL),
53 m_curl(curl),
54 m_headers(NULL),
55 m_is_transfer_state(false),
56 tpcForwardCreds(tpcForwardCreds)
57 {
58 InstallHandlers(curl);
59 }
60
61 // Note that we are "borrowing" a reference to the curl handle;
62 // it is not owned / freed by the State object. However, we use it
63 // as if there's only one handle per State.
64 State (off_t start_offset, Stream &stream, CURL *curl, bool push, bool tpcForwardCreds) :
65 m_push(push),
66 m_recv_status_line(false),
67 m_recv_all_headers(false),
68 m_offset(0),
69 m_start_offset(start_offset),
70 m_status_code(-1),
71 m_error_code(0),
72 m_content_length(-1),
73 m_stream(&stream),
74 m_curl(curl),
75 m_headers(NULL),
76 m_is_transfer_state(true),
77 tpcForwardCreds(tpcForwardCreds)
78 {
79 InstallHandlers(curl);
80 }
81
82 ~State();
83
84 void SetTransferParameters(off_t offset, size_t size);
85
86 void CopyHeaders(XrdHttpExtReq &req);
87
88 off_t BytesTransferred() const {return m_offset;}
89
90 void SetContentLength(const off_t content_length) { m_content_length = content_length; }
91
92 off_t GetContentLength() const {return m_content_length;}
93
94 int GetErrorCode() const {return m_error_code;}
95
96 void SetErrorCode(int error_code) {m_error_code = error_code;}
97
98 int GetStatusCode() const {return m_status_code;}
99
100 std::string GetErrorMessage() const {return m_error_buf;}
101
102 void SetErrorMessage(const std::string &error_msg) {m_error_buf = error_msg;}
103
104 void ResetAfterRequest();
105
106 CURL *GetHandle() const {return m_curl;}
107
108 int AvailableBuffers() const;
109
110 void DumpBuffers() const;
111
112 // Returns true if at least one byte of the response has been received,
113 // but not the entire contents of the response.
114 bool BodyTransferInProgress() const {return m_offset && (m_offset != m_content_length);}
115
116 // Duplicate the current state; all settings are copied over, but those
117 // related to the transient state are reset as if from a constructor.
118 State *Duplicate();
119
120 // Move the contents of a State object. To be replaced by a move
121 // constructor once C++11 is allowed in XRootD.
122 void Move (State &other);
123
124 // Flush and finalize a transfer state. Eventually calls close() on the underlying
125 // file handle, which should hopefully synchronize the file metadata across
126 // all readers (even other load-balanced servers on the same distributed file
127 // system).
128 //
129 // Returns true on success; false otherwise. Failures can happen, for example, if
130 // not all buffers have been reordered by the underlying stream.
131 bool Finalize();
132
133 // Flush the data in memory to disk, even if it may cause unaligned or short
134 // writes. Typically, only done while shutting down the transfer (note some
135 // backends may be unable to handle unaligned writes unless it's the last write).
136 int Flush();
137
138 // Retrieve the description of the remote connection; is of the form:
139 // tcp:129.93.3.4:1234
140 // tcp:[2600:900:6:1301:268a:7ff:fef6:a590]:2345
141 // This is meant to facilitate the monitoring via the performance markers.
142 std::string GetConnectionDescription();
143
144private:
145 bool InstallHandlers(CURL *curl);
146
147 State(const State&);
148 // Add back once C++11 is available
149 //State(State &&) noexcept;
150
151 // libcurl callback functions, along with the corresponding class methods.
152 static size_t HeaderCB(char *buffer, size_t size, size_t nitems,
153 void *userdata);
154 int Header(const std::string &header);
155 static size_t WriteCB(void *buffer, size_t size, size_t nitems, void *userdata);
156 ssize_t Write(char *buffer, size_t size);
157 static size_t ReadCB(void *buffer, size_t size, size_t nitems, void *userdata);
158 int Read(char *buffer, size_t size);
159
160 bool m_push; // whether we are transferring in "push-mode"
161 bool m_recv_status_line; // whether we have received a status line in the response from the remote host.
162 bool m_recv_all_headers; // true if we have seen the end of headers.
163 off_t m_offset; // number of bytes we have received.
164 off_t m_start_offset; // offset where we started in the file.
165 int m_status_code; // status code from HTTP response.
166 int m_error_code; // error code from underlying stream operations.
167 off_t m_content_length; // value of Content-Length header, if we received one.
168 Stream *m_stream; // stream corresponding to this transfer.
169 CURL *m_curl; // libcurl handle
170 struct curl_slist *m_headers; // any headers we set as part of the libcurl request.
171 std::vector<std::string> m_headers_copy; // Copies of custom headers.
172 std::string m_resp_protocol; // Response protocol in the HTTP status line.
173 std::string m_error_buf; // Any error associated with a response.
174 bool m_is_transfer_state; // If set to true, this state will be used to perform some transfers
175 bool tpcForwardCreds = false; // if set to true, the redirection will send user credentials to the redirection host
176};
177
178};
179
180#endif
void CURL
State(off_t start_offset, Stream &stream, CURL *curl, bool push, bool tpcForwardCreds)
State * Duplicate()
void Move(State &other)
int GetStatusCode() const
CURL * GetHandle() const
void DumpBuffers() const
off_t BytesTransferred() const
void CopyHeaders(XrdHttpExtReq &req)
bool BodyTransferInProgress() const
void SetErrorMessage(const std::string &error_msg)
void ResetAfterRequest()
int GetErrorCode() const
void SetTransferParameters(off_t offset, size_t size)
std::string GetErrorMessage() const
std::string GetConnectionDescription()
void SetContentLength(const off_t content_length)
off_t GetContentLength() const
void SetErrorCode(int error_code)
bool Finalize()
State(CURL *curl, bool tpcForwardCreds)
int AvailableBuffers() const