PeerStreamer

/*

 *  Copyright (c) 2010 Csaba Kiraly

 *

 *  This is free software; see gpl-3.0.txt

 */

#include <math.h>

#ifndef NAN        //NAN is missing in some old math.h versions

#define NAN            (0.0/0.0)

#endif

#ifndef INFINITY

#define INFINITY       (1.0/0.0)

#endif

#include <mon.h>

#include <ml.h>

#include <net_helper.h>

#include <grapes_msg_types.h>

#include "channel.h"

#include "dbg.h"

#include "measures.h"

#define PEER_PUBLISH_INTERVAL 10 //in seconds

#define P2P_PUBLISH_INTERVAL 60 //in seconds

extern const char *peername;

typedef struct nodeID {

        socketID_handle addr;

        int connID;        // connection associated to this node, -1 if myself

        int refcnt;

        //a quick and dirty static vector for measures TODO: make it dinamic

        MonHandler mhs[20];

        int n_mhs;

} nodeID;

static MonHandler chunk_dup, chunk_playout, neigh_size, chunk_receive, chunk_send, offer_accept, chunk_hops, chunk_delay, playout_delay;

//static MonHandler rx_bytes_chunk_per_sec, tx_bytes_chunk_per_sec, rx_bytes_sig_per_sec, tx_bytes_sig_per_sec;

//static MonHandler rx_chunks, tx_chunks;

/*

 * Initialize one measure

*/

void add_measure(MonHandler *mh, MeasurementId id, MeasurementCapabilities mc, MonParameterValue rate, const char *pubname, enum stat_types st[], int length, SocketId dst, MsgType mt)

{

        *mh = monCreateMeasure(id, mc);

        if (rate) monSetParameter (*mh, P_PUBLISHING_RATE, rate);

        if (length) monPublishStatisticalType(*mh, pubname, channel_get_name(), st , length, NULL);

        monActivateMeasure(*mh, dst, mt);

}

/*

 * Register duplicate arrival

*/

void reg_chunk_duplicate()

{

        if (!chunk_dup) {

                enum stat_types st[] = {SUM, RATE};

                // number of chunks which have been received more then once

                add_measure(&chunk_dup, GENERIC, 0, PEER_PUBLISH_INTERVAL, "ChunkDuplicates", st, sizeof(st)/sizeof(enum stat_types), NULL, MSG_TYPE_ANY);        //[chunks]

                monNewSample(chunk_dup, 0);        //force publish even if there are no events

        }

        monNewSample(chunk_dup, 1);

}

/*

 * Register playout/loss of a chunk before playout

*/

void reg_chunk_playout(int id, bool b, uint64_t timestamp)

{

        static MonHandler chunk_loss_burst_size;

        static int last_arrived_chunk = -1;

        struct timeval tnow;

        if (!chunk_playout && b) {        //don't count losses before the first arrived chunk

                enum stat_types st[] = {WIN_AVG, AVG, SUM, RATE};

                //number of chunks played

                add_measure(&chunk_playout, GENERIC, 0, PEER_PUBLISH_INTERVAL, "ChunksPlayed", st, sizeof(st)/sizeof(enum stat_types), NULL, MSG_TYPE_ANY);        //[chunks]

        }

        monNewSample(chunk_playout, b);

        if (!playout_delay) {

                enum stat_types st[] = {WIN_AVG, WIN_VAR};

                //delay after reorder buffer, however http module does not use reorder buffer

                add_measure(&playout_delay, GENERIC, 0, PEER_PUBLISH_INTERVAL, "ReorderDelay", st, sizeof(st)/sizeof(enum stat_types), NULL, MSG_TYPE_ANY);        //[seconds]

        }

        if (b) {        //count delay only if chunk has arrived

                gettimeofday(&tnow, NULL);

                monNewSample(playout_delay, ((int64_t)(tnow.tv_usec + tnow.tv_sec * 1000000ULL) - (int64_t)timestamp) / 1000000.0);

        }

        //if (!chunk_loss_burst_size) {

        //        enum stat_types st[] = {WIN_AVG, WIN_VAR};

        //        // number of consecutive lost chunks

        //        add_measure(&chunk_loss_burst_size, GENERIC, 0, PEER_PUBLISH_INTERVAL, "ChunkLossBurstSize", st, sizeof(st)/sizeof(enum stat_types), NULL, MSG_TYPE_ANY);        //[chunks]

        //}

        if (b) {

                if (last_arrived_chunk >= 0) {

                        int burst_size = id - 1 - last_arrived_chunk;

                        if (burst_size) monNewSample(chunk_loss_burst_size, burst_size);

                }

                last_arrived_chunk = id;

        }

}

/*

 * Register actual neghbourhood size

*/

void reg_neigh_size(int s)

{

        if (!neigh_size) {

                enum stat_types st[] = {LAST};

                // number of peers in the neighboorhood

                add_measure(&neigh_size, GENERIC, 0, PEER_PUBLISH_INTERVAL, "NeighSize", st, sizeof(st)/sizeof(enum stat_types), NULL, MSG_TYPE_ANY);        //[peers]

        }

        monNewSample(neigh_size, s);

}

/*

 * Register chunk receive event

*/

void reg_chunk_receive(int id, uint64_t timestamp, int hopcount, bool old, bool dup)

{

        struct timeval tnow;

        if (!chunk_receive) {

                enum stat_types st[] = {RATE};

                // total number of received chunks per second

                add_measure(&chunk_receive, GENERIC, 0, PEER_PUBLISH_INTERVAL, "TotalRxChunk", st, sizeof(st)/sizeof(enum stat_types), NULL, MSG_TYPE_ANY);        //[chunks/s]

                monNewSample(chunk_receive, 0);        //force publish even if there are no events

        }

        monNewSample(chunk_receive, 1);

        if (!chunk_hops) {

                enum stat_types st[] = {WIN_AVG};

                // number of hops from source on the p2p network

                add_measure(&chunk_hops, GENERIC, 0, PEER_PUBLISH_INTERVAL, "OverlayHops", st, sizeof(st)/sizeof(enum stat_types), NULL, MSG_TYPE_ANY);        //[peers]

        }

        monNewSample(chunk_hops, hopcount);

        if (!chunk_delay) {

                enum stat_types st[] = {WIN_AVG, WIN_VAR};

                // time elapsed since the source emitted the chunk

                add_measure(&chunk_delay, GENERIC, 0, PEER_PUBLISH_INTERVAL, "ReceiveDelay", st, sizeof(st)/sizeof(enum stat_types), NULL, MSG_TYPE_ANY);        //[seconds]

        }

        gettimeofday(&tnow, NULL);

        monNewSample(chunk_delay, ((int64_t)(tnow.tv_usec + tnow.tv_sec * 1000000ULL) - (int64_t)timestamp) / 1000000.0);

}

/*

 * Register chunk send event

*/

void reg_chunk_send(int id)

{

        if (!chunk_send) {

                enum stat_types st[] = {RATE};

                add_measure(&chunk_send, GENERIC, 0, PEER_PUBLISH_INTERVAL, "TotalTxChunk", st, sizeof(st)/sizeof(enum stat_types), NULL, MSG_TYPE_ANY);        //[chunks/s]

                monNewSample(chunk_send, 0);        //force publish even if there are no events

        }

        monNewSample(chunk_send, 1);

}

/*

 * Register chunk accept evemt

*/

void reg_offer_accept(bool b)

{

        if (!offer_accept) {

                enum stat_types st[] = {WIN_AVG};

                // ratio between number of offers and number of accepts

                add_measure(&offer_accept, GENERIC, 0, PEER_PUBLISH_INTERVAL, "OfferAccept", st, sizeof(st)/sizeof(enum stat_types), NULL, MSG_TYPE_ANY);        //[no unit -> ratio]

        }

        monNewSample(offer_accept, b);

}

/*

 * Initialize peer level measurements

*/

void init_measures()

{

        if (peername) monSetPeerName(peername);

}

/*

 * End peer level measurements

*/

void end_measures()

{

}

/*

 * Initialize p2p measurements towards a peer

*/

void add_measures(struct nodeID *id)

{

        // Add measures

        int j = 0;

        enum stat_types stwinavgwinvar[] = {WIN_AVG, WIN_VAR};

        enum stat_types stwinavg[] = {WIN_AVG};

        enum stat_types stwinavgrate[] = {WIN_AVG, RATE};

//        enum stat_types stsum[] = {SUM};

        enum stat_types stsumwinsumrate[] = {SUM, PERIOD_SUM, WIN_SUM, RATE};

        dprintf("adding measures to %s\n",node_addr(id));

        /* HopCount */

        // number of hops at IP level

       add_measure(&id->mhs[j++], HOPCOUNT, PACKET | IN_BAND, P2P_PUBLISH_INTERVAL, "HopCount", stwinavg, sizeof(stwinavg)/sizeof(enum stat_types), id->addr, MSG_TYPE_SIGNALLING);        //[IP hops]

        /* Round Trip Time */

       add_measure(&id->mhs[j++], RTT, PACKET | IN_BAND, P2P_PUBLISH_INTERVAL, "RoundTripDelay", stwinavgwinvar, sizeof(stwinavgwinvar)/sizeof(enum stat_types), id->addr, MSG_TYPE_SIGNALLING);        //[seconds]

        /* Loss */

       add_measure(&id->mhs[j++], SEQWIN, PACKET | IN_BAND, 0, NULL, NULL, 0, id->addr, MSG_TYPE_CHUNK);

       add_measure(&id->mhs[j++], LOSS, PACKET | IN_BAND, P2P_PUBLISH_INTERVAL, "LossRate", stwinavg, sizeof(stwinavg)/sizeof(enum stat_types), id->addr, MSG_TYPE_CHUNK);        //LossRate_avg [probability 0..1] LossRate_rate [lost_pkts/sec]

       /* RX,TX volume in bytes (only chunks) */

       add_measure(&id->mhs[j++], RX_BYTE, PACKET | IN_BAND, P2P_PUBLISH_INTERVAL, "RxBytesChunk", stsumwinsumrate, sizeof(stsumwinsumrate)/sizeof(enum stat_types), id->addr, MSG_TYPE_CHUNK);        //[bytes]

       add_measure(&id->mhs[j++], TX_BYTE, PACKET | IN_BAND, P2P_PUBLISH_INTERVAL, "TxBytesChunk", stsumwinsumrate, sizeof(stsumwinsumrate)/sizeof(enum stat_types), id->addr, MSG_TYPE_CHUNK);        //[bytes]

       /* RX,TX volume in bytes (only signaling) */

       add_measure(&id->mhs[j++], RX_BYTE, PACKET | IN_BAND, P2P_PUBLISH_INTERVAL, "RxBytesSig", stsumwinsumrate, sizeof(stsumwinsumrate)/sizeof(enum stat_types), id->addr, MSG_TYPE_SIGNALLING);        //[bytes]

       add_measure(&id->mhs[j++], TX_BYTE, PACKET | IN_BAND, P2P_PUBLISH_INTERVAL, "TxBytesSig", stsumwinsumrate, sizeof(stsumwinsumrate)/sizeof(enum stat_types), id->addr, MSG_TYPE_SIGNALLING);        //[bytes]

        // Chunks

       add_measure(&id->mhs[j++], RX_PACKET, DATA | IN_BAND, P2P_PUBLISH_INTERVAL, "RxChunks", stwinavgrate, sizeof(stwinavgrate)/sizeof(enum stat_types), id->addr, MSG_TYPE_CHUNK);        //RxChunks_sum [chunks] RxChunks_rate [chunks/sec]

       add_measure(&id->mhs[j++], TX_PACKET, DATA | IN_BAND, P2P_PUBLISH_INTERVAL, "TxChunks", stwinavgrate, sizeof(stwinavgrate)/sizeof(enum stat_types), id->addr, MSG_TYPE_CHUNK);        //TxChunks_sum [chunks] TxChunks_rate [chunks/sec]

//        // Capacity

        add_measure(&id->mhs[j++], CLOCKDRIFT, PACKET | IN_BAND, 0, NULL, NULL, 0, id->addr, MSG_TYPE_CHUNK);

        monSetParameter (id->mhs[j-1], P_CLOCKDRIFT_ALGORITHM, 1);

        add_measure(&id->mhs[j++], CORRECTED_DELAY, PACKET | IN_BAND, 0, NULL, NULL, 0, id->addr, MSG_TYPE_CHUNK);

        add_measure(&id->mhs[j++], CAPACITY_CAPPROBE, PACKET | IN_BAND, P2P_PUBLISH_INTERVAL, "Capacity", stwinavg, sizeof(stwinavg)/sizeof(enum stat_types), id->addr, MSG_TYPE_CHUNK);        //[bytes/s]

        monSetParameter (id->mhs[j-1], P_CAPPROBE_DELAY_TH, -1); //disable: seems to have  implementation problems

//        monSetParameter (id->mhs[j-1], P_CAPPROBE_PKT_TH, 5);

//        monSetParameter (mh, P_CAPPROBE_PKT_TH, 100);

//        monSetParameter (mh, P_CAPPROBE_IPD_TH, 60);

//        monPublishStatisticalType(mh, NULL, st , sizeof(st)/sizeof(enum stat_types), repoclient);

        // for static must not be more then 10 or whatever size is in net_helper-ml.c

        id->n_mhs = j;

}

/*

 * Delete p2p measurements towards a peer

*/

void delete_measures(struct nodeID *id)

{

        dprintf("deleting measures from %s\n",node_addr(id));

        while(id->n_mhs) {

                monDestroyMeasure(id->mhs[--(id->n_mhs)]);

        }

}

/*

 * Helper to retrieve a measure

*/

double get_measure(struct nodeID *id, int j, enum stat_types st)

{

        return (id->n_mhs > j) ? monRetrieveResult(id->mhs[j], st) : NAN;

}

/*

 * Hopcount to a given peer

*/

int get_hopcount(struct nodeID *id){

        double r = get_measure(id, 0, LAST);

        return isnan(r) ? -1 : (int) r;

}

/*

 * RTT to a given peer in seconds

*/

double get_rtt(struct nodeID *id){

        return get_measure(id, 1, WIN_AVG);

}

/*

 * average RTT to a set of peers in seconds

*/

double get_average_rtt(struct nodeID **ids, int len){

        int i;

        int n = 0;

        double sum = 0;

        for (i = 0; i < len; i++) {

                double l = get_rtt(ids[i]);

                if (!isnan(l)) {

                        sum += l;

                        n++;

                }

        }

        return (n > 0) ? sum / n : NAN;

}

/*

 * loss ratio from a given peer as 0..1

*/

double get_lossrate(struct nodeID *id){

        return get_measure(id, 3, WIN_AVG);

}

/*

 * average loss ratio from a set of peers as 0..1

*/

double get_average_lossrate(struct nodeID **ids, int len){

        int i;

        int n = 0;

        double sum = 0;

        for (i = 0; i < len; i++) {

                double l = get_lossrate(ids[i]);

                if (!isnan(l)) {

                        sum += l;

                        n++;

                }

        }

        return (n > 0) ? sum / n : NAN;

}

double get_receive_delay(void) {

        return chunk_delay ? monRetrieveResult(chunk_delay, WIN_AVG) : NAN;

}