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raft_protocol.h
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raft_protocol.h
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#ifndef raft_protocol_h
#define raft_protocol_h
#include "rpc.h"
#include "raft_state_machine.h"
#include <string>
enum raft_rpc_opcodes {
op_request_vote = 0x1212,
op_append_entries = 0x3434,
op_install_snapshot = 0x5656
};
enum raft_rpc_status {
OK,
RETRY,
RPCERR,
NOENT,
IOERR
};
class request_vote_args {
public:
int term; //candidate's term
int candidateId; //candidate requesting vote
int lastLogIndex; //index of candidate’s last log entry
int lastLogTerm; //term of candidate’s last log entry
};
marshall& operator<<(marshall &m, const request_vote_args& args);
unmarshall& operator>>(unmarshall &u, request_vote_args& args);
class request_vote_reply {
public:
int currentTerm; //currentTerm, for candidate to update itself
bool vateGranted; //true means candidate received vote
};
marshall& operator<<(marshall &m, const request_vote_reply& reply);
unmarshall& operator>>(unmarshall &u, request_vote_reply& reply);
template<typename command>
class log_entry {
public:
// Your code here
command command_;
int termNumber;
int index;
};
template<typename command>
marshall& operator<<(marshall &m, const log_entry<command>& entry) {
// Your code here
m<<entry.command_<<entry.termNumber<<entry.index;
return m;
}
template<typename command>
unmarshall& operator>>(unmarshall &u, log_entry<command>& entry) {
// Your code here
u>>entry.command_>>entry.termNumber>>entry.index;
return u;
}
template<typename command>
class append_entries_args {
public:
// Your code here
int term; //leader’s term
int leaderId; //so follower can redirect clients
int prevLogIndex; //index of log entry immediately preceding new ones
int prevLogTerm; //term of prevLogIndex entry
bool empty;
std::vector<log_entry<command>> entries; //log entries to store (empty for heartbeat;may send more than one for efficiency)
int leaderCommit; //leader’s commitIndex
};
template<typename command>
marshall& operator<<(marshall &m, const append_entries_args<command>& args) {
// Your code here
m<<args.term<<args.leaderId<<args.prevLogIndex<<args.prevLogTerm<<args.empty<<args.leaderCommit<<args.entries;
return m;
}
template<typename command>
unmarshall& operator>>(unmarshall &u, append_entries_args<command>& args) {
// Your code here
u>>args.term>>args.leaderId>>args.prevLogIndex>>args.prevLogTerm>>args.empty>>args.leaderCommit>>args.entries;
return u;
}
class append_entries_reply {
public:
// Your code here
int term; //currentTerm for leader to update itself
bool success;// true if follower contained entry matching prevLogIndex and prevLogTerm
int conflictIndex;
};
marshall& operator<<(marshall &m, const append_entries_reply& reply);
unmarshall& operator>>(unmarshall &m, append_entries_reply& reply);
class install_snapshot_args {
public:
// Your code here
int term;
int lastIncludedIndex;
int lastIncludedTerm;
std::vector<char> data;
};
marshall& operator<<(marshall &m, const install_snapshot_args& args);
unmarshall& operator>>(unmarshall &m, install_snapshot_args& args);
class install_snapshot_reply {
public:
// Your code here
int term;
};
marshall& operator<<(marshall &m, const install_snapshot_reply& reply);
unmarshall& operator>>(unmarshall &m, install_snapshot_reply& reply);
#endif // raft_protocol_h