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#!/usr/libexec/platform-python
#
#  psn -- Linux Process Snapper by Tanel Poder [https://0x.tools]
#  Copyright 2019-2021 Tanel Poder
#
#  This program is free software; you can redistribute it and/or modify
#  it under the terms of the GNU General Public License as published by
#  the Free Software Foundation; either version 2 of the License, or
#  (at your option) any later version.
#
#  This program is distributed in the hope that it will be useful,
#  but WITHOUT ANY WARRANTY; without even the implied warranty of
#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
#  GNU General Public License for more details.
#
#  You should have received a copy of the GNU General Public License along
#  with this program; if not, write to the Free Software Foundation, Inc.,
#  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
#
#  SPDX-License-Identifier: GPL-2.0-or-later
#
# NOTES
#
#  If you have only python3 binary in your system (no "python" command without any suffix),
#  then set up the OS default alternative or symlink so that you'd have a "python" command.
#
#  For example (on RHEL 8):
#    sudo alternatives --set python /usr/bin/python3
#
#  One exception on RHEL 5, use the following line, without quotes (if you have the
#  additional python26 package installed from EPEL):
#
#  "#!/usr/bin/env python26"
#

PSN_VERSION = '1.2.4'

import sys, os, os.path, time, datetime
import re
import sqlite3
import logging
from signal import signal, SIGPIPE, SIG_DFL

sys.path.append(os.path.dirname(os.path.dirname(os.path.realpath(__file__))) + '/lib/0xtools')

import argparse
import psnproc as proc, psnreport

# don't print "broken pipe" error when piped into commands like "head"
signal(SIGPIPE,SIG_DFL)

### Defaults ###
default_group_by='comm,state'

### CLI handling ###
parser = argparse.ArgumentParser()
parser.add_argument('-d', dest="sample_seconds", metavar='seconds', type=int, default=5, help='number of seconds to sample for')
parser.add_argument('-p', '--pid', metavar='pid', default=None, nargs='?', help='process id to sample (including all its threads), or process name regex, or omit for system-wide sampling')
# TODO implement -t filtering below
parser.add_argument('-t', '--thread', metavar='tid', default=None, nargs='?', help='thread/task id to sample (not implemented yet)')

parser.add_argument('-r', '--recursive', default=False, action='store_true', help='also sample and report for descendant processes')
parser.add_argument('-a', '--all-states', default=False, action='store_true', help='display threads in all states, including idle ones')

parser.add_argument('--sample-hz', default=20, type=int, help='sample rate in Hz (default: %(default)d)')
parser.add_argument('--ps-hz', default=2, type=int, help='sample rate of new processes in Hz (default: %(default)d)')

parser.add_argument('-o', '--output-sample-db', metavar='filename', default=':memory:', type=str, help='path of sqlite3 database to persist samples to, defaults to in-memory/transient')
parser.add_argument('-i', '--input-sample-db', metavar='filename', default=None, type=str, help='path of sqlite3 database to read samples from instead of actively sampling')

parser.add_argument('-s', '--select', metavar='csv-columns', default='', help='additional columns to report')
parser.add_argument('-g', '--group-by', metavar='csv-columns', default=default_group_by, help='columns to aggregate by in reports')
parser.add_argument('-G', '--append-group-by', metavar='csv-columns', default=None, help='default + additional columns to aggregate by in reports')
#parser.add_argument('-f', '--filter', metavar='filter-sql', default='1=1', help="sample schema SQL to apply to filter report. ('active' and 'idle' keywords may also be used)")

parser.add_argument('--list', default=None, action='store_true', help='list all available columns')

# specify csv sources to be captured in full. use with -o or --output-sample-db to capture proc data for manual analysis
parser.add_argument('--sources', metavar='csv-source-names', default='', help=argparse.SUPPRESS)
# capture all sources in full. use with -o or --output-sample-db', help=argparse.SUPPRESS)
parser.add_argument('--all-sources', default=False, action='store_true', help=argparse.SUPPRESS)

parser.add_argument('--debug', default=False, action='store_true', help=argparse.SUPPRESS)
parser.add_argument('--profile', default=False, action='store_true', help=argparse.SUPPRESS)
parser.add_argument('--show-yourself', default=False, action='store_true', help=argparse.SUPPRESS)

args = parser.parse_args()


### Set up Logging
if args.debug:
    logging.basicConfig(stream=sys.stderr, level=logging.DEBUG, format='%(asctime)s %(message)s')
else:
    logging.basicConfig(stream=sys.stderr, level=logging.INFO, format='%(asctime)s %(message)s')

start_time = time.time()
sample_period_s = 1. / args.sample_hz
sample_ps_period_s = 1. / args.ps_hz

if args.list:
    for p in proc.all_sources:
        print("\n" + p.name)
        print("====================================")
        for c in p.available_columns:
            if c[1]:
                print("%-30s %5s" % (c[0], c[1].__name__))

    exit(0)

if args.all_sources:
    args.sources = proc.all_sources
else:
    args.sources = [s for s in proc.all_sources if s.name in args.sources.split(',')]

args.select = args.select.split(',')
args.group_by = args.group_by.split(',')
if args.append_group_by:
    args.append_group_by = args.append_group_by.split(',')
else:
    args.append_group_by = []

if not args.all_states:
   included_states = 'active'
else:
   included_states = None

### Report definition ###

active_process_sample = psnreport.Report(
    'Active Threads',
    projection=args.select+['samples', 'avg_threads'],
    dimensions=args.group_by+args.append_group_by,
    order=['samples'],
    where=[included_states]
)

system_activity_by_user = psnreport.Report(
    'Active Threads by User',
    projection=args.select+['uid', 'comm', 'samples', 'avg_threads'],
    dimensions=args.group_by+args.append_group_by,
)

reports = [active_process_sample]#, system_activity_by_user]


# consolidate sources required for all reports
sources = {} # source -> set(cols)
for r in reports:
    for s, cs in r.sources.items():
        source_cols = sources.get(s, set())
        source_cols.update(cs)
        sources[s] = source_cols

# add sources requested for full sampling
for full_source in args.sources:
    sources[full_source] = set([c[0] for c in full_source.available_columns])

# update sources with set of reqd columns
for s, cs in sources.items():
    s.set_stored_columns(cs)


def sqlexec(conn, sql):
    logging.debug(sql)
    conn.execute(sql)
    logging.debug('Done')

def sqlexecmany(conn, sql, samples):
    logging.debug(sql)
    conn.execute(sql, samples)
    logging.debug('Done')

### Schema setup ###
if args.input_sample_db:
    conn = sqlite3.connect(args.input_sample_db)
else:
    conn = sqlite3.connect(args.output_sample_db)
    sqlexec(conn, 'pragma synchronous=0')

    def create_table(conn, s):
        def sqlite_type(python_type):
            return {int: 'INTEGER', int: 'INTEGER', float: 'REAL', str: 'TEXT', str: 'TEXT'}.get(python_type)

        sqlite_cols = [(c[0], sqlite_type(c[1])) for c in s.schema_columns]
        sqlite_cols_sql = ', '.join([' '.join(c) for c in sqlite_cols])
        sql = "CREATE TABLE IF NOT EXISTS '%s' (%s)" % (s.name, sqlite_cols_sql)
        sqlexec(conn,sql)

        sql = "CREATE INDEX IF NOT EXISTS '%s_event_idx' ON %s (event_time, pid, task)" % (s.name, s.name)
        sqlexec(conn,sql)

    for s in sources:
        create_table(conn, s)


### Sampling utility functions ###
def get_matching_processes(pid_arg=None, recursive=False):
    # where pid_arg can be a single pid, comma-separated pids, or a regex on process executable name

    process_children = {} # pid -> [children-pids]
    pid_basename = []

    # TODO use os.listdir() when -r or process name regex is not needed
    for line in  os.popen('ps -A -o pid,ppid,comm', 'r').readlines()[1:]:
        tokens = line.split()
        pid = int(tokens[0])
        ppid = int(tokens[1])

        children = process_children.get(ppid, [])
        children.append(pid)
        process_children[ppid] = children

        path_cmd = tokens[2]
        #cmd = os.path.basename(path_cmd)
        cmd = path_cmd
        pid_basename.append((pid, cmd))

    if pid_arg:
        try:
            arg_pids = [int(p) for p in pid_arg.split(',')]
            selected_pids = [p for p, b in pid_basename if p in arg_pids]
        except ValueError as e:
            selected_pids = [p for p, b in pid_basename if re.search(pid_arg, b)]

        # recursive pid walking is not needed when looking for all system pids anyway
        if recursive:
            i = 0
            while i < len(selected_pids):
                children = process_children.get(selected_pids[i], [])
                selected_pids.extend(children)
                i += 1
    else:
        selected_pids = [p for p, b in pid_basename]

    # deduplicate pids & remove pSnapper pid (as pSnapper doesnt consume any resources when it's not running)
    selected_pids=list(set(selected_pids))
    if not args.show_yourself:
        if os.getpid() in selected_pids:
            selected_pids.remove(os.getpid())
    return selected_pids


def get_process_tasks(pids):
    tasks_by_pid = {}
    for pid in pids:
        try:
            tasks_by_pid[pid] = os.listdir('/proc/%s/task' % pid)
        except OSError as e:
            pass # process may nolonger exist by the time we get here
    return tasks_by_pid


## Main sampling loop ###
def main():
    final_warning='' # show warning text in the end of output, if any

    if args.input_sample_db:
        num_sample_events = int(sqlexec(conn,'SELECT COUNT(DISTINCT(event_time)) FROM stat').fetchone()[0])
        total_measure_s = 0.
    else:
        print("")
        print('Linux Process Snapper v%s by Tanel Poder [https://0x.tools]' % PSN_VERSION)
        print('Sampling /proc/%s for %d seconds...' % (', '.join([s.name for s in sources.keys()]), args.sample_seconds)),
        sys.stdout.flush()
        num_sample_events = 0
        num_ps_samples = 0
        total_measure_s = 0.

        selected_pids = None
        process_tasks = {}
        sample_ioerrors = 0  # detect permissions issues with /proc/access

        sample_seconds = args.sample_seconds

        try:
            while time.time() < start_time + args.sample_seconds:
                measure_begin_time = datetime.datetime.utcnow()
                event_time = measure_begin_time.isoformat()

                # refresh matching pids at a much lower frequency than process sampling as the underlying ps is expensive
                if not selected_pids or time.time() > start_time + num_ps_samples * sample_ps_period_s:
                    selected_pids = get_matching_processes(args.pid, args.recursive)
                    process_tasks = get_process_tasks(selected_pids)
                    num_ps_samples += 1

                    if not selected_pids:
                        print('No matching processes found:', args.pid)
                        sys.exit(1)

                for pid in selected_pids:
                    try:
                        # if any process-level samples fail, don't insert any sample event rows for process or tasks...
                        process_samples = [s.sample(event_time, pid, pid) for s in sources.keys() if s.task_level == False]

                        for s, samples in zip([s for s in sources.keys() if s.task_level == False], process_samples):
                            sqlexecmany(conn, s.insert_sql, samples)

                        for task in process_tasks.get(pid, []):
                            try:
                                # ...but if a task disappears mid-sample simply discard data for that task only
                                task_samples = [s.sample(event_time, pid, task) for s in sources.keys() if s.task_level == True]

                                for s, samples in zip([s for s in sources.keys() if s.task_level == True], task_samples):
                                    # TODO factor out
                                    conn.executemany(s.insert_sql, samples)

                            except IOError as e:
                                sample_ioerrors +=1
                                logging.debug(e)
                                continue

                    except IOError as e:
                        sample_ioerrors +=1
                        logging.debug(e)
                        continue

                conn.commit()

                num_sample_events += 1
                measure_delta = datetime.datetime.utcnow() - measure_begin_time
                total_measure_s += measure_delta.seconds + (measure_delta.microseconds * 0.000001)

                sleep_until = start_time + num_sample_events * sample_period_s
                time.sleep(max(0, sleep_until - time.time()))

            print('finished.')
            print
        except KeyboardInterrupt as e:
            sample_seconds = time.time() - start_time
            print('sampling interrupted.')
            print


    ### Query and report ###
    for r in reports:
        r.output_report(conn)

    print('samples: %s' %  num_sample_events),
    if not args.input_sample_db:
        print('(expected: %s)' % int(sample_seconds * args.sample_hz))
        if num_sample_events < 10:
           final_warning += 'Warning: less than 10 samples captured. Reduce the amount of processes monitored or run pSnapper for longer.'
    else:
        print

    first_table_name = list(sources.keys())[0].name
    print('total processes: %s, threads: %s' % (conn.execute('SELECT COUNT(DISTINCT(pid)) FROM ' + first_table_name).fetchone()[0], conn.execute('SELECT COUNT(DISTINCT(task)) FROM ' + first_table_name).fetchone()[0]))
    print('runtime: %.2f, measure time: %.2f' % (time.time() - start_time, total_measure_s))
    print

    # TODO needs some improvement as some file IO errors come from processes/threads exiting
    # before we get to sample all files of interest under the PID
    if sample_ioerrors >= 100:
        final_warning = 'Warning: %d /proc file accesses failed. Run as root or avoid restricted\n         proc-files like "syscall" or measure only your own processes' % sample_ioerrors

    if final_warning:
        print(final_warning)
        print


## dump python self-profiling data on exit
def exit(r):
    if args.profile:
        import pstats
        p = pstats.Stats('psn-prof.dmp')
        p.sort_stats('cumulative').print_stats(30)
    sys.exit(r)


## let's do this!
if args.profile:
    import cProfile
    cProfile.run('main()', 'psn-prof.dmp')
else:
    main()

exit(0)