# Copyright (C) 2021 Red Hat, Inc., Pavel Moravec <pmoravec@redhat.com>

# This file is part of the sos project: https://github.com/sosreport/sos
#
# This copyrighted material is made available to anyone wishing to use,
# modify, copy, or redistribute it subject to the terms and conditions of
# version 2 of the GNU General Public License.
#
# See the LICENSE file in the source distribution for further information.

from re import match
from shlex import quote
from sos.report.plugins import Plugin, IndependentPlugin, PluginOpt


class PulpCore(Plugin, IndependentPlugin):

    short_desc = 'Pulp-3 aka pulpcore'

    plugin_name = "pulpcore"
    commands = ("pulpcore-manager",)
    files = ("/etc/pulp/settings.py",)
    option_list = [
        PluginOpt('task-days', default=7, desc='days of task history')
    ]

    dbhost = "localhost"
    dbport = 5432
    dbname = "pulpcore"
    dbuser = "pulp"
    dbpasswd = ""
    staticroot = "/var/lib/pulp/assets"
    uploaddir = "/var/lib/pulp/media/upload"
    env = {"PGPASSWORD": dbpasswd}

    def parse_settings_config(self):
        """ Parse pulp settings """
        databases_scope = False

        def separate_value(line, sep=':'):
            # an auxiliary method to parse values from lines like:
            #       'HOST': 'localhost',
            val = line.split(sep)[1].lstrip().rstrip(',')
            if (val.startswith('"') and val.endswith('"')) or \
               (val.startswith('\'') and val.endswith('\'')):
                val = val[1:-1]
            return val

        try:
            with open("/etc/pulp/settings.py", 'r', encoding='UTF-8') as file:
                # split the lines to "one option per line" format
                for line in file.read() \
                        .replace(',', ',\n').replace('{', '{\n') \
                        .replace('}', '\n}').splitlines():
                    # skip empty lines and lines with comments
                    if not line or line[0] == '#':
                        continue
                    if line.startswith("DATABASES"):
                        databases_scope = True
                        continue
                    # example HOST line to parse:
                    #         'HOST': 'localhost',
                    pattern = r"\s*['|\"]%s['|\"]\s*:\s*\S+"
                    if databases_scope and match(pattern % 'HOST', line):
                        self.dbhost = separate_value(line)
                    if databases_scope and match(pattern % 'PORT', line):
                        self.dbport = separate_value(line)
                    if databases_scope and match(pattern % 'NAME', line):
                        self.dbname = separate_value(line)
                    if databases_scope and match(pattern % 'USER', line):
                        self.dbuser = separate_value(line)
                    if databases_scope and match(pattern % 'PASSWORD', line):
                        self.dbpasswd = separate_value(line)
                    # if line contains closing '}' database_scope end
                    if databases_scope and '}' in line:
                        databases_scope = False
                    if line.startswith("STATIC_ROOT = "):
                        self.staticroot = separate_value(line, sep='=')
                    if line.startswith("CHUNKED_UPLOAD_DIR = "):
                        self.uploaddir = separate_value(line, sep='=')
        except IOError:
            # fallback when the cfg file is not accessible
            pass
        # set the password to os.environ when calling psql commands to prevent
        # printing it in sos logs
        # we can't set os.environ directly now: other plugins can overwrite it
        self.env = {"PGPASSWORD": self.dbpasswd}

    def setup(self):
        self.parse_settings_config()

        self.add_copy_spec([
            "/etc/pulp/settings.py",
            "/etc/pki/pulp/*"
        ])
        # skip collecting certificate keys
        self.add_forbidden_path("/etc/pki/pulp/**/*.key")

        self.add_cmd_output("curl -ks https://localhost/pulp/api/v3/status/",
                            suggest_filename="pulp_status")
        dynaconf_env = {"LC_ALL": "en_US.UTF-8",
                        "PULP_SETTINGS": "/etc/pulp/settings.py",
                        "DJANGO_SETTINGS_MODULE": "pulpcore.app.settings"}
        self.add_cmd_output("dynaconf list", env=dynaconf_env)
        for _dir in [self.staticroot, self.uploaddir]:
            self.add_dir_listing(_dir)

        task_days = self.get_option('task-days')
        for table in ['core_task', 'core_taskgroup',
                      'core_groupprogressreport', 'core_progressreport']:
            _query = ("COPY (SELECT STRING_AGG(column_name, ', ') FROM "
                      f"information_schema.columns WHERE table_name='{table}'"
                      "AND table_schema = 'public' AND column_name NOT IN"
                      " ('args', 'kwargs', 'enc_args', 'enc_kwargs'))"
                      " TO STDOUT;")
            col_out = self.exec_cmd(self.build_query_cmd(_query), env=self.env)
            columns = col_out['output'] if col_out['status'] == 0 else '*'
            _query = (f"select {columns} from {table} where pulp_last_updated"
                      f"> NOW() - interval '{task_days} days' order by"
                      " pulp_last_updated")
            _cmd = self.build_query_cmd(_query)
            self.add_cmd_output(_cmd, env=self.env, suggest_filename=table)

        # collect tables sizes, ordered
        _cmd = self.build_query_cmd(
            "SELECT table_name, pg_size_pretty(total_bytes) AS total, "
            "pg_size_pretty(index_bytes) AS INDEX , "
            "pg_size_pretty(toast_bytes) AS toast, pg_size_pretty(table_bytes)"
            " AS TABLE FROM ( SELECT *, "
            "total_bytes-index_bytes-COALESCE(toast_bytes,0) AS table_bytes "
            "FROM (SELECT c.oid,nspname AS table_schema, relname AS "
            "TABLE_NAME, c.reltuples AS row_estimate, "
            "pg_total_relation_size(c.oid) AS total_bytes, "
            "pg_indexes_size(c.oid) AS index_bytes, "
            "pg_total_relation_size(reltoastrelid) AS toast_bytes "
            "FROM pg_class c LEFT JOIN pg_namespace n ON "
            "n.oid = c.relnamespace WHERE relkind = 'r') a) a order by "
            "total_bytes DESC"
        )
        self.add_cmd_output(_cmd, suggest_filename='pulpcore_db_tables_sizes',
                            env=self.env)

    def build_query_cmd(self, query, csv=False):
        """
        Builds the command needed to invoke the pgsql query as the postgres
        user.
        The query requires significant quoting work to satisfy both the
        shell and postgres parsing requirements. Note that this will generate
        a large amount of quoting in sos logs referencing the command being run
        """
        if csv:
            query = f"COPY ({query}) TO STDOUT " \
                    "WITH (FORMAT 'csv', DELIMITER ',', HEADER)"
        _dbcmd = "psql --no-password -h %s -p %s -U %s -d %s -c %s"
        return _dbcmd % (self.dbhost, self.dbport,
                         self.dbuser, self.dbname, quote(query))

    def postproc(self):
        # obfuscate from /etc/pulp/settings.py and "dynaconf list":
        # SECRET_KEY = "eKfeDkTnvss7p5WFqYdGPWxXfHnsbDBx"
        # 'PASSWORD': 'tGrag2DmtLqKLTWTQ6U68f6MAhbqZVQj',
        # AUTH_LDAP_BIND_PASSWORD = 'ouch-a-secret'
        # the PASSWORD can be also in an one-liner list, so detect its value
        # in non-greedy manner till first ',' or '}'
        key_pass_re = r"((?:SECRET_KEY|AUTH_LDAP_BIND_PASSWORD)" \
                      r"(?:\<.+\>)?(\s*=)?|(password|PASSWORD)" \
                      r"(\"|'|:)+)\s*(\S*)"
        repl = r"\1 ********"
        self.do_path_regex_sub("/etc/pulp/settings.py", key_pass_re, repl)
        self.do_cmd_output_sub("dynaconf list", key_pass_re, repl)


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