You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
627 lines
21 KiB
627 lines
21 KiB
/*
|
|
* Copyright (c) 2006-2007 Niels Provos <provos@citi.umich.edu>
|
|
* Copyright (c) 2007-2012 Niels Provos and Nick Mathewson
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
* 3. The name of the author may not be used to endorse or promote products
|
|
* derived from this software without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
|
|
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
|
|
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
|
|
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
|
|
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
|
|
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
|
|
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
|
|
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
|
|
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
|
|
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
|
*/
|
|
#ifndef EVENT2_RPC_H_INCLUDED_
|
|
#define EVENT2_RPC_H_INCLUDED_
|
|
|
|
/* For int types. */
|
|
#include <event2/util.h>
|
|
#include <event2/visibility.h>
|
|
|
|
#ifdef __cplusplus
|
|
extern "C" {
|
|
#endif
|
|
|
|
/** @file rpc.h
|
|
*
|
|
* This header files provides basic support for an RPC server and client.
|
|
*
|
|
* To support RPCs in a server, every supported RPC command needs to be
|
|
* defined and registered.
|
|
*
|
|
* EVRPC_HEADER(SendCommand, Request, Reply);
|
|
*
|
|
* SendCommand is the name of the RPC command.
|
|
* Request is the name of a structure generated by event_rpcgen.py.
|
|
* It contains all parameters relating to the SendCommand RPC. The
|
|
* server needs to fill in the Reply structure.
|
|
* Reply is the name of a structure generated by event_rpcgen.py. It
|
|
* contains the answer to the RPC.
|
|
*
|
|
* To register an RPC with an HTTP server, you need to first create an RPC
|
|
* base with:
|
|
*
|
|
* struct evrpc_base *base = evrpc_init(http);
|
|
*
|
|
* A specific RPC can then be registered with
|
|
*
|
|
* EVRPC_REGISTER(base, SendCommand, Request, Reply, FunctionCB, arg);
|
|
*
|
|
* when the server receives an appropriately formatted RPC, the user callback
|
|
* is invoked. The callback needs to fill in the reply structure.
|
|
*
|
|
* void FunctionCB(EVRPC_STRUCT(SendCommand)* rpc, void *arg);
|
|
*
|
|
* To send the reply, call EVRPC_REQUEST_DONE(rpc);
|
|
*
|
|
* See the regression test for an example.
|
|
*/
|
|
|
|
/**
|
|
Determines if the member has been set in the message
|
|
|
|
@param msg the message to inspect
|
|
@param member the member variable to test for presences
|
|
@return 1 if it's present or 0 otherwise.
|
|
*/
|
|
#define EVTAG_HAS(msg, member) \
|
|
((msg)->member##_set == 1)
|
|
|
|
#ifndef EVENT2_RPC_COMPAT_H_INCLUDED_
|
|
|
|
/**
|
|
Assigns a value to the member in the message.
|
|
|
|
@param msg the message to which to assign a value
|
|
@param member the name of the member variable
|
|
@param value the value to assign
|
|
*/
|
|
#define EVTAG_ASSIGN(msg, member, value) \
|
|
(*(msg)->base->member##_assign)((msg), (value))
|
|
/**
|
|
Assigns a value to the member in the message.
|
|
|
|
@param msg the message to which to assign a value
|
|
@param member the name of the member variable
|
|
@param value the value to assign
|
|
@param len the length of the value
|
|
*/
|
|
#define EVTAG_ASSIGN_WITH_LEN(msg, member, value, len) \
|
|
(*(msg)->base->member##_assign)((msg), (value), (len))
|
|
/**
|
|
Returns the value for a member.
|
|
|
|
@param msg the message from which to get the value
|
|
@param member the name of the member variable
|
|
@param pvalue a pointer to the variable to hold the value
|
|
@return 0 on success, -1 otherwise.
|
|
*/
|
|
#define EVTAG_GET(msg, member, pvalue) \
|
|
(*(msg)->base->member##_get)((msg), (pvalue))
|
|
/**
|
|
Returns the value for a member.
|
|
|
|
@param msg the message from which to get the value
|
|
@param member the name of the member variable
|
|
@param pvalue a pointer to the variable to hold the value
|
|
@param plen a pointer to the length of the value
|
|
@return 0 on success, -1 otherwise.
|
|
*/
|
|
#define EVTAG_GET_WITH_LEN(msg, member, pvalue, plen) \
|
|
(*(msg)->base->member##_get)((msg), (pvalue), (plen))
|
|
|
|
#endif /* EVENT2_RPC_COMPAT_H_INCLUDED_ */
|
|
|
|
/**
|
|
Adds a value to an array.
|
|
*/
|
|
#define EVTAG_ARRAY_ADD_VALUE(msg, member, value) \
|
|
(*(msg)->base->member##_add)((msg), (value))
|
|
/**
|
|
Allocates a new entry in the array and returns it.
|
|
*/
|
|
#define EVTAG_ARRAY_ADD(msg, member) \
|
|
(*(msg)->base->member##_add)(msg)
|
|
/**
|
|
Gets a variable at the specified offset from the array.
|
|
*/
|
|
#define EVTAG_ARRAY_GET(msg, member, offset, pvalue) \
|
|
(*(msg)->base->member##_get)((msg), (offset), (pvalue))
|
|
/**
|
|
Returns the number of entries in the array.
|
|
*/
|
|
#define EVTAG_ARRAY_LEN(msg, member) ((msg)->member##_length)
|
|
|
|
|
|
struct evbuffer;
|
|
struct event_base;
|
|
struct evrpc_req_generic;
|
|
struct evrpc_request_wrapper;
|
|
struct evrpc;
|
|
|
|
/** The type of a specific RPC Message
|
|
*
|
|
* @param rpcname the name of the RPC message
|
|
*/
|
|
#define EVRPC_STRUCT(rpcname) struct evrpc_req__##rpcname
|
|
|
|
struct evhttp_request;
|
|
struct evrpc_status;
|
|
struct evrpc_hook_meta;
|
|
|
|
/** Creates the definitions and prototypes for an RPC
|
|
*
|
|
* You need to use EVRPC_HEADER to create structures and function prototypes
|
|
* needed by the server and client implementation. The structures have to be
|
|
* defined in an .rpc file and converted to source code via event_rpcgen.py
|
|
*
|
|
* @param rpcname the name of the RPC
|
|
* @param reqstruct the name of the RPC request structure
|
|
* @param replystruct the name of the RPC reply structure
|
|
* @see EVRPC_GENERATE()
|
|
*/
|
|
#define EVRPC_HEADER(rpcname, reqstruct, rplystruct) \
|
|
EVRPC_STRUCT(rpcname) { \
|
|
struct evrpc_hook_meta *hook_meta; \
|
|
struct reqstruct* request; \
|
|
struct rplystruct* reply; \
|
|
struct evrpc* rpc; \
|
|
struct evhttp_request* http_req; \
|
|
struct evbuffer* rpc_data; \
|
|
}; \
|
|
EVENT2_EXPORT_SYMBOL \
|
|
int evrpc_send_request_##rpcname(struct evrpc_pool *, \
|
|
struct reqstruct *, struct rplystruct *, \
|
|
void (*)(struct evrpc_status *, \
|
|
struct reqstruct *, struct rplystruct *, void *cbarg), \
|
|
void *);
|
|
|
|
struct evrpc_pool;
|
|
|
|
/** use EVRPC_GENERATE instead */
|
|
EVENT2_EXPORT_SYMBOL
|
|
struct evrpc_request_wrapper *evrpc_make_request_ctx(
|
|
struct evrpc_pool *pool, void *request, void *reply,
|
|
const char *rpcname,
|
|
void (*req_marshal)(struct evbuffer*, void *),
|
|
void (*rpl_clear)(void *),
|
|
int (*rpl_unmarshal)(void *, struct evbuffer *),
|
|
void (*cb)(struct evrpc_status *, void *, void *, void *),
|
|
void *cbarg);
|
|
|
|
/** Creates a context structure that contains rpc specific information.
|
|
*
|
|
* EVRPC_MAKE_CTX is used to populate a RPC specific context that
|
|
* contains information about marshaling the RPC data types.
|
|
*
|
|
* @param rpcname the name of the RPC
|
|
* @param reqstruct the name of the RPC request structure
|
|
* @param replystruct the name of the RPC reply structure
|
|
* @param pool the evrpc_pool over which to make the request
|
|
* @param request a pointer to the RPC request structure object
|
|
* @param reply a pointer to the RPC reply structure object
|
|
* @param cb the callback function to call when the RPC has completed
|
|
* @param cbarg the argument to supply to the callback
|
|
*/
|
|
#define EVRPC_MAKE_CTX(rpcname, reqstruct, rplystruct, \
|
|
pool, request, reply, cb, cbarg) \
|
|
evrpc_make_request_ctx(pool, request, reply, \
|
|
#rpcname, \
|
|
(void (*)(struct evbuffer *, void *))reqstruct##_marshal, \
|
|
(void (*)(void *))rplystruct##_clear, \
|
|
(int (*)(void *, struct evbuffer *))rplystruct##_unmarshal, \
|
|
(void (*)(struct evrpc_status *, void *, void *, void *))cb, \
|
|
cbarg)
|
|
|
|
/** Generates the code for receiving and sending an RPC message
|
|
*
|
|
* EVRPC_GENERATE is used to create the code corresponding to sending
|
|
* and receiving a particular RPC message
|
|
*
|
|
* @param rpcname the name of the RPC
|
|
* @param reqstruct the name of the RPC request structure
|
|
* @param replystruct the name of the RPC reply structure
|
|
* @see EVRPC_HEADER()
|
|
*/
|
|
#define EVRPC_GENERATE(rpcname, reqstruct, rplystruct) \
|
|
int evrpc_send_request_##rpcname(struct evrpc_pool *pool, \
|
|
struct reqstruct *request, struct rplystruct *reply, \
|
|
void (*cb)(struct evrpc_status *, \
|
|
struct reqstruct *, struct rplystruct *, void *cbarg), \
|
|
void *cbarg) { \
|
|
return evrpc_send_request_generic(pool, request, reply, \
|
|
(void (*)(struct evrpc_status *, void *, void *, void *))cb, \
|
|
cbarg, \
|
|
#rpcname, \
|
|
(void (*)(struct evbuffer *, void *))reqstruct##_marshal, \
|
|
(void (*)(void *))rplystruct##_clear, \
|
|
(int (*)(void *, struct evbuffer *))rplystruct##_unmarshal); \
|
|
}
|
|
|
|
/** Provides access to the HTTP request object underlying an RPC
|
|
*
|
|
* Access to the underlying http object; can be used to look at headers or
|
|
* for getting the remote ip address
|
|
*
|
|
* @param rpc_req the rpc request structure provided to the server callback
|
|
* @return an struct evhttp_request object that can be inspected for
|
|
* HTTP headers or sender information.
|
|
*/
|
|
#define EVRPC_REQUEST_HTTP(rpc_req) (rpc_req)->http_req
|
|
|
|
/** completes the server response to an rpc request */
|
|
EVENT2_EXPORT_SYMBOL
|
|
void evrpc_request_done(struct evrpc_req_generic *req);
|
|
|
|
/** accessors for request and reply */
|
|
EVENT2_EXPORT_SYMBOL
|
|
void *evrpc_get_request(struct evrpc_req_generic *req);
|
|
EVENT2_EXPORT_SYMBOL
|
|
void *evrpc_get_reply(struct evrpc_req_generic *req);
|
|
|
|
/** Creates the reply to an RPC request
|
|
*
|
|
* EVRPC_REQUEST_DONE is used to answer a request; the reply is expected
|
|
* to have been filled in. The request and reply pointers become invalid
|
|
* after this call has finished.
|
|
*
|
|
* @param rpc_req the rpc request structure provided to the server callback
|
|
*/
|
|
#define EVRPC_REQUEST_DONE(rpc_req) do { \
|
|
struct evrpc_req_generic *req_ = (struct evrpc_req_generic *)(rpc_req); \
|
|
evrpc_request_done(req_); \
|
|
} while (0)
|
|
|
|
|
|
struct evrpc_base;
|
|
struct evhttp;
|
|
|
|
/* functions to start up the rpc system */
|
|
|
|
/** Creates a new rpc base from which RPC requests can be received
|
|
*
|
|
* @param server a pointer to an existing HTTP server
|
|
* @return a newly allocated evrpc_base struct or NULL if an error occurred
|
|
* @see evrpc_free()
|
|
*/
|
|
EVENT2_EXPORT_SYMBOL
|
|
struct evrpc_base *evrpc_init(struct evhttp *server);
|
|
|
|
/**
|
|
* Frees the evrpc base
|
|
*
|
|
* For now, you are responsible for making sure that no rpcs are ongoing.
|
|
*
|
|
* @param base the evrpc_base object to be freed
|
|
* @see evrpc_init
|
|
*/
|
|
EVENT2_EXPORT_SYMBOL
|
|
void evrpc_free(struct evrpc_base *base);
|
|
|
|
/** register RPCs with the HTTP Server
|
|
*
|
|
* registers a new RPC with the HTTP server, each RPC needs to have
|
|
* a unique name under which it can be identified.
|
|
*
|
|
* @param base the evrpc_base structure in which the RPC should be
|
|
* registered.
|
|
* @param name the name of the RPC
|
|
* @param request the name of the RPC request structure
|
|
* @param reply the name of the RPC reply structure
|
|
* @param callback the callback that should be invoked when the RPC
|
|
* is received. The callback has the following prototype
|
|
* void (*callback)(EVRPC_STRUCT(Message)* rpc, void *arg)
|
|
* @param cbarg an additional parameter that can be passed to the callback.
|
|
* The parameter can be used to carry around state.
|
|
*/
|
|
#define EVRPC_REGISTER(base, name, request, reply, callback, cbarg) \
|
|
evrpc_register_generic(base, #name, \
|
|
(void (*)(struct evrpc_req_generic *, void *))callback, cbarg, \
|
|
(void *(*)(void *))request##_new_with_arg, NULL, \
|
|
(void (*)(void *))request##_free, \
|
|
(int (*)(void *, struct evbuffer *))request##_unmarshal, \
|
|
(void *(*)(void *))reply##_new_with_arg, NULL, \
|
|
(void (*)(void *))reply##_free, \
|
|
(int (*)(void *))reply##_complete, \
|
|
(void (*)(struct evbuffer *, void *))reply##_marshal)
|
|
|
|
/**
|
|
Low level function for registering an RPC with a server.
|
|
|
|
Use EVRPC_REGISTER() instead.
|
|
|
|
@see EVRPC_REGISTER()
|
|
*/
|
|
EVENT2_EXPORT_SYMBOL
|
|
int evrpc_register_rpc(struct evrpc_base *, struct evrpc *,
|
|
void (*)(struct evrpc_req_generic*, void *), void *);
|
|
|
|
/**
|
|
* Unregisters an already registered RPC
|
|
*
|
|
* @param base the evrpc_base object from which to unregister an RPC
|
|
* @param name the name of the rpc to unregister
|
|
* @return -1 on error or 0 when successful.
|
|
* @see EVRPC_REGISTER()
|
|
*/
|
|
#define EVRPC_UNREGISTER(base, name) evrpc_unregister_rpc((base), #name)
|
|
|
|
EVENT2_EXPORT_SYMBOL
|
|
int evrpc_unregister_rpc(struct evrpc_base *base, const char *name);
|
|
|
|
/*
|
|
* Client-side RPC support
|
|
*/
|
|
|
|
struct evhttp_connection;
|
|
struct evrpc_status;
|
|
|
|
/** launches an RPC and sends it to the server
|
|
*
|
|
* EVRPC_MAKE_REQUEST() is used by the client to send an RPC to the server.
|
|
*
|
|
* @param name the name of the RPC
|
|
* @param pool the evrpc_pool that contains the connection objects over which
|
|
* the request should be sent.
|
|
* @param request a pointer to the RPC request structure - it contains the
|
|
* data to be sent to the server.
|
|
* @param reply a pointer to the RPC reply structure. It is going to be filled
|
|
* if the request was answered successfully
|
|
* @param cb the callback to invoke when the RPC request has been answered
|
|
* @param cbarg an additional argument to be passed to the client
|
|
* @return 0 on success, -1 on failure
|
|
*/
|
|
#define EVRPC_MAKE_REQUEST(name, pool, request, reply, cb, cbarg) \
|
|
evrpc_send_request_##name((pool), (request), (reply), (cb), (cbarg))
|
|
|
|
/**
|
|
Makes an RPC request based on the provided context.
|
|
|
|
This is a low-level function and should not be used directly
|
|
unless a custom context object is provided. Use EVRPC_MAKE_REQUEST()
|
|
instead.
|
|
|
|
@param ctx a context from EVRPC_MAKE_CTX()
|
|
@returns 0 on success, -1 otherwise.
|
|
@see EVRPC_MAKE_REQUEST(), EVRPC_MAKE_CTX()
|
|
*/
|
|
EVENT2_EXPORT_SYMBOL
|
|
int evrpc_make_request(struct evrpc_request_wrapper *ctx);
|
|
|
|
/** creates an rpc connection pool
|
|
*
|
|
* a pool has a number of connections associated with it.
|
|
* rpc requests are always made via a pool.
|
|
*
|
|
* @param base a pointer to an struct event_based object; can be left NULL
|
|
* in singled-threaded applications
|
|
* @return a newly allocated struct evrpc_pool object or NULL if an error
|
|
* occurred
|
|
* @see evrpc_pool_free()
|
|
*/
|
|
EVENT2_EXPORT_SYMBOL
|
|
struct evrpc_pool *evrpc_pool_new(struct event_base *base);
|
|
/** frees an rpc connection pool
|
|
*
|
|
* @param pool a pointer to an evrpc_pool allocated via evrpc_pool_new()
|
|
* @see evrpc_pool_new()
|
|
*/
|
|
EVENT2_EXPORT_SYMBOL
|
|
void evrpc_pool_free(struct evrpc_pool *pool);
|
|
|
|
/**
|
|
* Adds a connection over which rpc can be dispatched to the pool.
|
|
*
|
|
* The connection object must have been newly created.
|
|
*
|
|
* @param pool the pool to which to add the connection
|
|
* @param evcon the connection to add to the pool.
|
|
*/
|
|
EVENT2_EXPORT_SYMBOL
|
|
void evrpc_pool_add_connection(struct evrpc_pool *pool,
|
|
struct evhttp_connection *evcon);
|
|
|
|
/**
|
|
* Removes a connection from the pool.
|
|
*
|
|
* The connection object must have been newly created.
|
|
*
|
|
* @param pool the pool from which to remove the connection
|
|
* @param evcon the connection to remove from the pool.
|
|
*/
|
|
EVENT2_EXPORT_SYMBOL
|
|
void evrpc_pool_remove_connection(struct evrpc_pool *pool,
|
|
struct evhttp_connection *evcon);
|
|
|
|
/**
|
|
* Sets the timeout in secs after which a request has to complete. The
|
|
* RPC is completely aborted if it does not complete by then. Setting
|
|
* the timeout to 0 means that it never timeouts and can be used to
|
|
* implement callback type RPCs.
|
|
*
|
|
* Any connection already in the pool will be updated with the new
|
|
* timeout. Connections added to the pool after set_timeout has be
|
|
* called receive the pool timeout only if no timeout has been set
|
|
* for the connection itself.
|
|
*
|
|
* @param pool a pointer to a struct evrpc_pool object
|
|
* @param timeout_in_secs the number of seconds after which a request should
|
|
* timeout and a failure be returned to the callback.
|
|
*/
|
|
EVENT2_EXPORT_SYMBOL
|
|
void evrpc_pool_set_timeout(struct evrpc_pool *pool, int timeout_in_secs);
|
|
|
|
/**
|
|
* Hooks for changing the input and output of RPCs; this can be used to
|
|
* implement compression, authentication, encryption, ...
|
|
*/
|
|
|
|
enum EVRPC_HOOK_TYPE {
|
|
EVRPC_INPUT, /**< apply the function to an input hook */
|
|
EVRPC_OUTPUT /**< apply the function to an output hook */
|
|
};
|
|
|
|
#ifndef _WIN32
|
|
/** Deprecated alias for EVRPC_INPUT. Not available on windows, where it
|
|
* conflicts with platform headers. */
|
|
#define INPUT EVRPC_INPUT
|
|
/** Deprecated alias for EVRPC_OUTPUT. Not available on windows, where it
|
|
* conflicts with platform headers. */
|
|
#define OUTPUT EVRPC_OUTPUT
|
|
#endif
|
|
|
|
/**
|
|
* Return value from hook processing functions
|
|
*/
|
|
|
|
enum EVRPC_HOOK_RESULT {
|
|
EVRPC_TERMINATE = -1, /**< indicates the rpc should be terminated */
|
|
EVRPC_CONTINUE = 0, /**< continue processing the rpc */
|
|
EVRPC_PAUSE = 1 /**< pause processing request until resumed */
|
|
};
|
|
|
|
/** adds a processing hook to either an rpc base or rpc pool
|
|
*
|
|
* If a hook returns TERMINATE, the processing is aborted. On CONTINUE,
|
|
* the request is immediately processed after the hook returns. If the
|
|
* hook returns PAUSE, request processing stops until evrpc_resume_request()
|
|
* has been called.
|
|
*
|
|
* The add functions return handles that can be used for removing hooks.
|
|
*
|
|
* @param vbase a pointer to either struct evrpc_base or struct evrpc_pool
|
|
* @param hook_type either INPUT or OUTPUT
|
|
* @param cb the callback to call when the hook is activated
|
|
* @param cb_arg an additional argument for the callback
|
|
* @return a handle to the hook so it can be removed later
|
|
* @see evrpc_remove_hook()
|
|
*/
|
|
EVENT2_EXPORT_SYMBOL
|
|
void *evrpc_add_hook(void *vbase,
|
|
enum EVRPC_HOOK_TYPE hook_type,
|
|
int (*cb)(void *, struct evhttp_request *, struct evbuffer *, void *),
|
|
void *cb_arg);
|
|
|
|
/** removes a previously added hook
|
|
*
|
|
* @param vbase a pointer to either struct evrpc_base or struct evrpc_pool
|
|
* @param hook_type either INPUT or OUTPUT
|
|
* @param handle a handle returned by evrpc_add_hook()
|
|
* @return 1 on success or 0 on failure
|
|
* @see evrpc_add_hook()
|
|
*/
|
|
EVENT2_EXPORT_SYMBOL
|
|
int evrpc_remove_hook(void *vbase,
|
|
enum EVRPC_HOOK_TYPE hook_type,
|
|
void *handle);
|
|
|
|
/** resume a paused request
|
|
*
|
|
* @param vbase a pointer to either struct evrpc_base or struct evrpc_pool
|
|
* @param ctx the context pointer provided to the original hook call
|
|
*/
|
|
EVENT2_EXPORT_SYMBOL
|
|
int evrpc_resume_request(void *vbase, void *ctx, enum EVRPC_HOOK_RESULT res);
|
|
|
|
/** adds meta data to request
|
|
*
|
|
* evrpc_hook_add_meta() allows hooks to add meta data to a request. for
|
|
* a client request, the meta data can be inserted by an outgoing request hook
|
|
* and retrieved by the incoming request hook.
|
|
*
|
|
* @param ctx the context provided to the hook call
|
|
* @param key a NUL-terminated c-string
|
|
* @param data the data to be associated with the key
|
|
* @param data_size the size of the data
|
|
*/
|
|
EVENT2_EXPORT_SYMBOL
|
|
void evrpc_hook_add_meta(void *ctx, const char *key,
|
|
const void *data, size_t data_size);
|
|
|
|
/** retrieves meta data previously associated
|
|
*
|
|
* evrpc_hook_find_meta() can be used to retrieve meta data associated to a
|
|
* request by a previous hook.
|
|
* @param ctx the context provided to the hook call
|
|
* @param key a NUL-terminated c-string
|
|
* @param data pointer to a data pointer that will contain the retrieved data
|
|
* @param data_size pointer to the size of the data
|
|
* @return 0 on success or -1 on failure
|
|
*/
|
|
EVENT2_EXPORT_SYMBOL
|
|
int evrpc_hook_find_meta(void *ctx, const char *key,
|
|
void **data, size_t *data_size);
|
|
|
|
/**
|
|
* returns the connection object associated with the request
|
|
*
|
|
* @param ctx the context provided to the hook call
|
|
* @return a pointer to the evhttp_connection object or NULL if an error
|
|
* occurred
|
|
*/
|
|
EVENT2_EXPORT_SYMBOL
|
|
struct evhttp_connection *evrpc_hook_get_connection(void *ctx);
|
|
|
|
/**
|
|
Function for sending a generic RPC request.
|
|
|
|
Do not call this function directly, use EVRPC_MAKE_REQUEST() instead.
|
|
|
|
@see EVRPC_MAKE_REQUEST()
|
|
*/
|
|
EVENT2_EXPORT_SYMBOL
|
|
int evrpc_send_request_generic(struct evrpc_pool *pool,
|
|
void *request, void *reply,
|
|
void (*cb)(struct evrpc_status *, void *, void *, void *),
|
|
void *cb_arg,
|
|
const char *rpcname,
|
|
void (*req_marshal)(struct evbuffer *, void *),
|
|
void (*rpl_clear)(void *),
|
|
int (*rpl_unmarshal)(void *, struct evbuffer *));
|
|
|
|
/**
|
|
Function for registering a generic RPC with the RPC base.
|
|
|
|
Do not call this function directly, use EVRPC_REGISTER() instead.
|
|
|
|
@see EVRPC_REGISTER()
|
|
*/
|
|
EVENT2_EXPORT_SYMBOL
|
|
int evrpc_register_generic(struct evrpc_base *base, const char *name,
|
|
void (*callback)(struct evrpc_req_generic *, void *), void *cbarg,
|
|
void *(*req_new)(void *), void *req_new_arg, void (*req_free)(void *),
|
|
int (*req_unmarshal)(void *, struct evbuffer *),
|
|
void *(*rpl_new)(void *), void *rpl_new_arg, void (*rpl_free)(void *),
|
|
int (*rpl_complete)(void *),
|
|
void (*rpl_marshal)(struct evbuffer *, void *));
|
|
|
|
/** accessors for obscure and undocumented functionality */
|
|
EVENT2_EXPORT_SYMBOL
|
|
struct evrpc_pool* evrpc_request_get_pool(struct evrpc_request_wrapper *ctx);
|
|
EVENT2_EXPORT_SYMBOL
|
|
void evrpc_request_set_pool(struct evrpc_request_wrapper *ctx,
|
|
struct evrpc_pool *pool);
|
|
EVENT2_EXPORT_SYMBOL
|
|
void evrpc_request_set_cb(struct evrpc_request_wrapper *ctx,
|
|
void (*cb)(struct evrpc_status*, void *request, void *reply, void *arg),
|
|
void *cb_arg);
|
|
|
|
#ifdef __cplusplus
|
|
}
|
|
#endif
|
|
|
|
#endif /* EVENT2_RPC_H_INCLUDED_ */
|