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qps-packaging/src/lookup.h

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2.0 KiB

// lookup.h emacs, this is written in -*-c++-*-
//
// This program is free software. See the file COPYING for details.
// Author: Mattias Engdeg<65>rd, 1997-1999
#ifndef LOOKUP_H
#define LOOKUP_H
#include <qstring.h>
#include <qsocketnotifier.h>
#include "svec.h"
#include <QHash>
// queue (fifo) of unsigned ints (inet addresses)
class UintQueue
{
public:
UintQueue();
bool isEmpty() { return first == last; };
void enqueue(unsigned x);
unsigned dequeue();
private:
Svec<unsigned> queue;
int first; // index of first item in queue
int last; // index where next item will be put (< first)
};
// list node for LRU cache of hostnames:
// This list is doubly-linked circular (to reduce the amount of special cases),
// with a head node that carries no data. In addition, each node is
// entered into a hash table for rapid lookup
class Hostnode
{
public:
Hostnode();
Hostnode(unsigned addr);
// these must be called on the head of the list
void moveToFront(Hostnode *node);
void deleteLast();
void insertFirst(Hostnode *node);
Hostnode *last() { return prev; };
QString name;
unsigned ipaddr; // hash key
Hostnode *next, *prev;
};
class Lookup : public QObject
{
Q_OBJECT
public:
Lookup();
~Lookup();
QString hostname(unsigned addr);
static void initproctitle(char **argv, char **envp);
signals:
void resolved(unsigned addr);
protected slots:
void receive_result(int);
void send_request(int);
protected:
void request(unsigned addr);
void do_child(int fd);
static void setproctitle(const char *txt);
static char *argv0;
static int maxtitlelen;
QHash<int, Hostnode *> hostdict;
Hostnode hostlru; // head of circular list
UintQueue addrqueue; // queue of addresses to lookup
int outstanding; // number of outstanding requests
int sockfd; // -1 if no helper process is running
QSocketNotifier *readsn, *writesn;
static const unsigned hostname_cache_size = 400; // max names to cache
};
#endif // LOOKUP_H