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/*
* Copyright 2018-2022 the Pacemaker project contributors
*
* The version control history for this file may have further details.
*
* This source code is licensed under the GNU Lesser General Public License
* version 2.1 or later (LGPLv2.1+) WITHOUT ANY WARRANTY.
*/
#ifndef PCMK__CRM_COMMON_MESSAGES_INTERNAL__H
#define PCMK__CRM_COMMON_MESSAGES_INTERNAL__H
#include <stdint.h> // uint32_t
#include <libxml/tree.h> // xmlNode
#include <crm/common/ipc_internal.h> // pcmk__client_t
#include <crm/common/results_internal.h> // pcmk__action_result_t
enum pcmk__request_flags {
pcmk__request_none = UINT32_C(0),
/* It would be nice if we could check for synchronous requests generically,
* but each daemon uses its own call options, so the daemons are responsible
* for setting this flag when appropriate.
*/
pcmk__request_sync = (UINT32_C(1) << 0),
/* Whether reply must use original call options (the library code does not
* use this, so it is for internal daemon use)
*/
pcmk__request_reuse_options = (UINT32_C(1) << 1),
};
// Server request (whether from an IPC client or cluster peer)
typedef struct {
// If request is from an IPC client
pcmk__client_t *ipc_client; // IPC client (NULL if not via IPC)
uint32_t ipc_id; // IPC message ID
uint32_t ipc_flags; // IPC message flags
// If message is from a cluster peer
const char *peer; // Peer name (NULL if not via cluster)
// Common information regardless of origin
xmlNode *xml; // Request XML
int call_options; // Call options set on request
uint32_t flags; // Flag group of pcmk__request_flags
pcmk__action_result_t result; // Where to store operation result
/* It would be nice if we could pull the IPC command from the XML
* generically, but each daemon uses a different XML attribute for it,
* so the daemon is responsible for populating this field.
*
* This must be a copy of the XML field, and not just a pointer into xml,
* because handlers might modify the original XML.
*
* @TODO Create a per-daemon struct with IPC handlers, IPC endpoints, etc.,
* and the name of the XML attribute for IPC commands, then replace this
* with a convenience function to copy the command.
*/
char *op; // IPC command name
} pcmk__request_t;
#define pcmk__set_request_flags(request, flags_to_set) do { \
(request)->flags = pcmk__set_flags_as(__func__, __LINE__, \
LOG_TRACE, "Request", "message", (request)->flags, \
(flags_to_set), #flags_to_set); \
} while (0)
// Type for mapping a server command to a handler
typedef struct {
const char *command;
xmlNode *(*handler)(pcmk__request_t *request);
} pcmk__server_command_t;
const char *pcmk__message_name(const char *name);
GHashTable *pcmk__register_handlers(const pcmk__server_command_t handlers[]);
xmlNode *pcmk__process_request(pcmk__request_t *request, GHashTable *handlers);
void pcmk__reset_request(pcmk__request_t *request);
/*!
* \internal
* \brief Get a loggable description of a request's origin
*
* \param[in] request
*
* \return "peer" if request was via CPG, "client" if via IPC, or "originator"
* if unknown
*/
static inline const char *
pcmk__request_origin_type(const pcmk__request_t *request)
{
if ((request != NULL) && (request->ipc_client != NULL)) {
return "client";
} else if ((request != NULL) && (request->peer != NULL)) {
return "peer";
} else {
return "originator";
}
}
/*!
* \internal
* \brief Get a loggable name for a request's origin
*
* \param[in] request
*
* \return Peer name if request was via CPG, client name if via IPC, or
* "(unspecified)" if unknown
*/
static inline const char *
pcmk__request_origin(const pcmk__request_t *request)
{
if ((request != NULL) && (request->ipc_client != NULL)) {
return pcmk__client_name(request->ipc_client);
} else if ((request != NULL) && (request->peer != NULL)) {
return request->peer;
} else {
return "(unspecified)";
}
}
#endif // PCMK__CRM_COMMON_MESSAGES_INTERNAL__H

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