/*  $NetBSD: debug.c,v 1.13 2018/11/16 02:39:02 manu Exp $ */

/*-
*  Copyright (c) 2010 Emmanuel Dreyfus. All rights reserved.
*
*  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.
*
*  THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
*  ``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 FOUNDATION OR CONTRIBUTORS
*  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.
*/

#include <puffs.h>
#include <stdio.h>
#include <stdlib.h>
#include <err.h>
#include <errno.h>
#include <sys/types.h>

#include "perfuse_if.h"
#include "perfuse_priv.h"
#include "fuse.h"

struct perfuse_opcode {
       int  opcode;
       const char *opname;
};

const struct perfuse_opcode perfuse_opcode[] = {
       { FUSE_LOOKUP, "LOOKUP" },
       { FUSE_FORGET, "FORGET" },
       { FUSE_GETATTR, "GETATTR" },
       { FUSE_SETATTR, "SETATTR" },
       { FUSE_READLINK, "READLINK" },
       { FUSE_SYMLINK, "SYMLINK" },
       { FUSE_MKNOD, "MKNOD" },
       { FUSE_MKDIR, "MKDIR" },
       { FUSE_UNLINK, "UNLINK" },
       { FUSE_RMDIR, "RMDIR" },
       { FUSE_RENAME, "RENAME" },
       { FUSE_LINK, "LINK" },
       { FUSE_OPEN, "OPEN" },
       { FUSE_READ, "READ" },
       { FUSE_WRITE, "WRITE" },
       { FUSE_STATFS, "STATFS" },
       { FUSE_RELEASE, "RELEASE" },
       { FUSE_FSYNC, "FSYNC" },
       { FUSE_SETXATTR, "SETXATTR" },
       { FUSE_GETXATTR, "GETXATTR" },
       { FUSE_LISTXATTR, "LISTXATTR" },
       { FUSE_REMOVEXATTR, "REMOVEXATTR" },
       { FUSE_FLUSH, "FLUSH" },
       { FUSE_INIT, "INIT" },
       { FUSE_OPENDIR, "OPENDIR" },
       { FUSE_READDIR, "READDIR" },
       { FUSE_RELEASEDIR, "RELEASEDIR" },
       { FUSE_FSYNCDIR, "FSYNCDIR" },
       { FUSE_GETLK, "GETLK" },
       { FUSE_SETLK, "SETLK" },
       { FUSE_SETLKW, "SETLKW" },
       { FUSE_ACCESS, "ACCESS" },
       { FUSE_CREATE, "CREATE" },
       { FUSE_INTERRUPT, "INTERRUPT" },
       { FUSE_BMAP, "BMAP" },
       { FUSE_DESTROY, "DESTROY" },
       { FUSE_IOCTL, "IOCTL" },
       { FUSE_POLL, "POLL" },
       { FUSE_CUSE_INIT, "CUSE_INIT" },
       { 0, "UNKNOWN" },
};

const char * const perfuse_qtypestr[] = {
       "READDIR",
       "READ",
       "WRITE",
       "AFTERWRITE",
       "OPEN",
       "AFTERXCHG",
       "REF"
};

const char *
perfuse_opname(int opcode)
{
       const struct perfuse_opcode *po;

       for (po = perfuse_opcode; po->opcode; po++) {
               if (po->opcode == opcode)
                       return po->opname;
       }

       return po->opname; /* "UNKNOWN" */
}

char *
perfuse_opdump_in(struct perfuse_state *ps, perfuse_msg_t *pm)
{
       struct fuse_in_header *fih;
       static char buf[BUFSIZ] = "";

       fih = GET_INHDR(ps, pm);

       switch(fih->opcode) {
       case FUSE_LOOKUP:
               (void)snprintf(buf, sizeof(buf), "path = \"%s\"",
                              _GET_INPAYLOAD(ps, pm, const char *));
               break;
       default:
               buf[0] = '\0';
               break;
       }

       return buf;
}

struct perfuse_trace *
perfuse_trace_begin(struct perfuse_state *ps, puffs_cookie_t opc,
       perfuse_msg_t *pm)
{
       struct perfuse_trace *pt;

       if ((pt = malloc(sizeof(*pt))) == NULL)
               DERR(EX_OSERR, "malloc failed");

       pt->pt_opcode = ps->ps_get_inhdr(pm)->opcode;
       pt->pt_status = inxchg;

       if (clock_gettime(CLOCK_REALTIME, &pt->pt_start) != 0)
               DERR(EX_OSERR, "clock_gettime failed");

       if (opc == 0)
               (void)strcpy(pt->pt_path, "");
       else
               (void)strlcpy(pt->pt_path,
                             perfuse_node_path(ps, opc),
                             sizeof(pt->pt_path));

       (void)strlcpy(pt->pt_extra,
                     perfuse_opdump_in(ps, pm),
                     sizeof(pt->pt_extra));

       TAILQ_INSERT_TAIL(&ps->ps_trace, pt, pt_list);
       ps->ps_tracecount++;

       return pt;
}

void
perfuse_trace_end(struct perfuse_state *ps, struct perfuse_trace *pt, int error)
{
       if (clock_gettime(CLOCK_REALTIME, &pt->pt_end) != 0)
               DERR(EX_OSERR, "clock_gettime failed");

       pt->pt_status = done;
       pt->pt_error = error;

       while (ps->ps_tracecount > PERFUSE_TRACECOUNT_MAX) {
               struct perfuse_trace *fpt = TAILQ_FIRST(&ps->ps_trace);

               if (fpt == NULL || fpt->pt_status != done)
                       break;

               TAILQ_REMOVE(&ps->ps_trace, fpt, pt_list);
               free(fpt);
               ps->ps_tracecount--;
       }
}

void
perfuse_trace_dump(struct puffs_usermount *pu, FILE *fp)
{
       struct perfuse_state *ps;
       struct perfuse_trace *pt;
       struct timespec ts_min[FUSE_OPCODE_MAX];
       struct timespec ts_max[FUSE_OPCODE_MAX];
       struct timespec ts_total[FUSE_OPCODE_MAX];
       int count[FUSE_OPCODE_MAX];
       uint64_t avg;
       int i;

       if (!(perfuse_diagflags & PDF_TRACE))
               return;

       ps = puffs_getspecific(pu);

       (void)ftruncate(fileno(fp), 0);
       (void)fseek(fp, 0UL, SEEK_SET);

       (void)memset(&ts_min, 0, sizeof(ts_min));
       (void)memset(&ts_max, 0, sizeof(ts_max));
       (void)memset(&ts_total, 0, sizeof(ts_total));
       (void)memset(&count, 0, sizeof(count));

       fprintf(fp, "Last %"PRId64" operations\n", ps->ps_tracecount);

       TAILQ_FOREACH(pt, &ps->ps_trace, pt_list) {
               const char *quote = pt->pt_path[0] != '\0' ? "\"" : "";

               fprintf(fp, "%lld.%09ld %s %s%s%s %s ",
                       (long long)pt->pt_start.tv_sec, pt->pt_start.tv_nsec,
                       perfuse_opname(pt->pt_opcode),
                       quote, pt->pt_path, quote,
                       pt->pt_extra);

               if (pt->pt_status == done) {
                       struct timespec ts;

                       ts.tv_sec = 0;  /* delint */
                       ts.tv_nsec = 0; /* delint */
                       timespecsub(&pt->pt_end, &pt->pt_start, &ts);

                       fprintf(fp, "error = %d elapsed = %lld.%09lu ",
                               pt->pt_error, (long long)ts.tv_sec,
                               ts.tv_nsec);

                       count[pt->pt_opcode]++;
                       timespecadd(&ts_total[pt->pt_opcode],
                                   &ts,
                                   &ts_total[pt->pt_opcode]);

                       if (timespeccmp(&ts, &ts_min[pt->pt_opcode], <) ||
                           (count[pt->pt_opcode] == 1))
                               ts_min[pt->pt_opcode] = ts;

                       if (timespeccmp(&ts, &ts_max[pt->pt_opcode], >))
                               ts_max[pt->pt_opcode] = ts;
               } else {
                       fprintf(fp, "ongoing ");
               }

               fprintf(fp, "\n");
       }

       fprintf(fp, "\nStatistics by operation\n");
       fprintf(fp, "operation\tcount\tmin\tavg\tmax\n");
       for (i = 0; i < FUSE_OPCODE_MAX; i++) {
               time_t min;

               if (count[i] != 0) {
                       avg = timespec2ns(&ts_total[i]) / count[i];
                       min = ts_min[i].tv_sec;
               } else {
                       avg = 0;
                       min = 0;
               }

               fprintf(fp, "%s\t%d\t%lld.%09ld\t%lld.%09ld\t%lld.%09ld\t\n",
                       perfuse_opname(i), count[i],
                       (long long)min, ts_min[i].tv_nsec,
                       (long long)(time_t)(avg / 1000000000L),
                       (long)(avg % 1000000000L),
                       (long long)ts_max[i].tv_sec, ts_max[i].tv_nsec);
       }

       fprintf(fp, "\n\nGlobal statistics\n");
       fprintf(fp, "Nodes: %d\n", ps->ps_nodecount);
       fprintf(fp, "Exchanges: %d\n", ps->ps_xchgcount);

       (void)fflush(fp);
       return;
}

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