ScoDoc/app/scodoc/notesdb.py

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# -*- mode: python -*-
# -*- coding: utf-8 -*-
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import datetime
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import html
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import traceback
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from flask import g, current_app, abort
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import psycopg2
import psycopg2.pool
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import psycopg2.extras
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from app import log
from app.scodoc.sco_exceptions import ScoException, ScoValueError, NoteProcessError
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quote_html = html.escape
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def quote_dict(d):
"html quote all values in dict"
for k in d.keys():
v = d[k]
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if isinstance(v, str):
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d[k] = quote_html(v, quote=True)
def unquote(s):
"inverse of quote"
# pas d'inverse de cgi.escape
# ne traite que &
# XX voir aussi sco_utils.unescape_html
return s.replace("&", "&")
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def open_db_connection():
"""Open a connection to the database"""
try:
g.db_conn = psycopg2.connect(current_app.config["SQLALCHEMY_DATABASE_URI"])
except psycopg2.OperationalError:
# Dans la majorité des cas, cela signifie que le serveur postgres
# n'est pas lancé.
log("open_db_connection: psycopg2.OperationalError")
abort(503) # HTTP 503 Service Unavailable
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def close_db_connection():
"""Commit and close database."""
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if hasattr(g, "db_conn"):
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g.db_conn.commit()
g.db_conn.close()
del g.db_conn
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def GetDBConnexion():
return g.db_conn
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# Nota: on pourrait maintenant utiliser psycopg2.extras.DictCursor
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class ScoDocCursor(psycopg2.extensions.cursor):
"""A database cursor emulating some methods of psycopg v1 cursors"""
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def dictfetchall(self):
col_names = [d[0] for d in self.description]
return [dict(zip(col_names, row)) for row in self.fetchall()]
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def dictfetchone(self):
col_names = [d[0] for d in self.description]
row = self.fetchone()
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if row:
return dict(zip(col_names, row))
else:
return {}
def SimpleQuery(query, args, cursor=None):
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if not cursor:
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cnx = GetDBConnexion()
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cursor = cnx.cursor(cursor_factory=ScoDocCursor)
# log( 'SimpleQuery(%s)' % (query % args) )
cursor.execute(query, args)
return cursor
def SimpleDictFetch(query, args, cursor=None):
cursor = SimpleQuery(query, args, cursor=cursor)
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return cursor.dictfetchall()
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def DBInsertDict(
cnx,
table,
vals,
commit=0,
convert_empty_to_nulls=1,
return_id=True,
ignore_conflicts=False,
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) -> int:
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"""insert into table values in dict 'vals'
Return: id de l'object créé
"""
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cursor = cnx.cursor(cursor_factory=ScoDocCursor)
if convert_empty_to_nulls:
for col in vals.keys():
if vals[col] == "":
vals[col] = None
# open('/tmp/vals','a').write( str(vals) + '\n' )
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cols = list(vals.keys())
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colnames = ",".join(cols)
fmt = ",".join(["%%(%s)s" % col for col in cols])
# print 'insert into %s (%s) values (%s)' % (table,colnames,fmt)
oid = None
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if ignore_conflicts:
ignore = " ON CONFLICT DO NOTHING"
else:
ignore = ""
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try:
if vals:
cursor.execute(
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"insert into %s (%s) values (%s)%s" % (table, colnames, fmt, ignore),
vals,
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)
else:
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cursor.execute("insert into %s default values%s" % (table, ignore))
if return_id:
cursor.execute(f"SELECT CURRVAL('{table}_id_seq')") # id créé
oid = cursor.fetchone()[0]
else:
oid = None
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except:
log("DBInsertDict: EXCEPTION !")
log("DBInsertDict: table=%s, vals=%s" % (str(table), str(vals)))
log("DBInsertDict: commit (exception)")
cnx.commit() # get rid of this transaction
raise # and re-raise exception
if commit:
# log("DBInsertDict: commit (requested)")
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cnx.commit()
return oid
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_SQL_REMOVE_BAD_CHARS = str.maketrans("", "", '%*()+=&|[]"`')
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def DBSelectArgs(
cnx,
table,
vals,
what=["*"],
sortkey=None,
test="=",
operator="and",
distinct=True,
aux_tables=[],
id_name=None,
limit="",
offset="",
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):
"""Select * from table where values match dict vals.
Returns cnx, columns_names, list of tuples
aux_tables = ( tablename, id_name )
"""
cursor = cnx.cursor(cursor_factory=ScoDocCursor)
if sortkey:
orderby = " order by " + sortkey
else:
orderby = ""
if distinct:
distinct = " distinct "
else:
distinct = ""
if limit != "":
limit = " LIMIT %d" % limit
if not offset:
offset = ""
if offset != "":
offset = " OFFSET %d" % offset
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operator = " " + operator + " "
# liste des tables (apres "from")
tables = [table] + [x[0] for x in aux_tables]
for i in range(len(tables)):
tables[i] = "%s T%d" % (tables[i], i)
tables = ", ".join(tables)
# condition (apres "where")
cond = ""
i = 1
cl = []
for _, aux_id in aux_tables:
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cl.append("T0.%s = T%d.%s" % (id_name, i, aux_id))
i = i + 1
cond += " and ".join(cl)
if vals:
if aux_tables: # paren
cond += " AND ( "
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if test == "~":
# Traitement des expressions régulières:
# n'autorise pas d'expressions
explist = []
for k in vals.keys():
# n'applique ~ qu'aux strings
if isinstance(vals[k], str):
vals[k] = vals[k].translate(_SQL_REMOVE_BAD_CHARS)
explist.append("T0.%s~%%(%s)s" % (k, k))
elif vals[k] is not None:
explist.append("T0.%s=%%(%s)s" % (k, k))
cond += operator.join(explist)
else:
cond += operator.join(
[
"T0.%s%s%%(%s)s" % (x, test, x)
for x in vals.keys()
if vals[x] != None
]
)
# conditions sur NULLs:
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cnuls = " and ".join(
["T0.%s is NULL" % x for x in vals.keys() if vals[x] is None]
)
if cnuls:
if cond:
cond = cond + " and " + cnuls
else:
cond = cnuls
# close paren
if aux_tables:
cond += ") "
if cond:
cond = " where " + cond
#
req = (
"select "
+ distinct
+ ", ".join(what)
+ " from "
+ tables
+ cond
+ orderby
+ limit
+ offset
)
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try:
cursor.execute(req, vals)
except:
log('Exception in DBSelectArgs:\n\treq="%s"\n\tvals="%s"\n' % (req, vals))
log(traceback.format_exc())
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cnx.rollback()
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raise ScoException()
return cursor.dictfetchall()
def DBUpdateArgs(cnx, table, vals, where=None, commit=False, convert_empty_to_nulls=1):
if not vals or where is None:
return
cursor = cnx.cursor(cursor_factory=ScoDocCursor)
if convert_empty_to_nulls:
for col in vals.keys():
if vals[col] == "":
vals[col] = None
s = ", ".join(["%s=%%(%s)s" % (x, x) for x in vals.keys()])
try:
req = "update " + table + " set " + s + " where " + where
cursor.execute(req, vals)
# log('req=%s\n'%req)
# log('vals=%s\n'%vals)
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except psycopg2.errors.StringDataRightTruncation as exc:
cnx.rollback()
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raise ScoValueError("champs de texte trop long !") from exc
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except:
cnx.rollback() # get rid of this transaction
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log('Exception in DBUpdateArgs:\n\treq="%s"\n\tvals="%s"\n' % (req, vals))
raise # and re-raise exception
if commit:
cnx.commit()
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def DBDelete(cnx, table, oid, commit=False):
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cursor = cnx.cursor(cursor_factory=ScoDocCursor)
try:
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cursor.execute("delete from " + table + " where id=%(oid)s", {"oid": oid})
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except:
cnx.commit() # get rid of this transaction
raise # and re-raise exception
if commit:
cnx.commit()
# --------------------------------------------------------------------
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class EditableTable(object):
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"""--- generic class: SQL table with create/edit/list/delete"""
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def __init__(
self,
table_name,
id_name,
dbfields,
sortkey=None,
output_formators={},
input_formators={},
aux_tables=[],
convert_null_outputs_to_empty=True,
html_quote=False, # changed in 9.0.10
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fields_creators={}, # { field : [ sql_command_to_create_it ] }
filter_nulls=True, # dont allow to set fields to null
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filter_dept=False, # ajoute selection sur g.scodoc_dept_id
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insert_ignore_conflicts=False,
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):
self.table_name = table_name
self.id_name = id_name
self.aux_tables = aux_tables
self.dbfields = dbfields
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# DB remove object_id and replace by "id":
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try:
i = self.dbfields.index(id_name)
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self.dbfields = ("id",) + self.dbfields[:i] + self.dbfields[i + 1 :]
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except ValueError:
pass
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self.sortkey = sortkey
self.output_formators = output_formators
self.input_formators = input_formators
self.convert_null_outputs_to_empty = convert_null_outputs_to_empty
self.html_quote = html_quote
self.fields_creators = fields_creators
self.filter_nulls = filter_nulls
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self.filter_dept = filter_dept
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self.sql_default_values = None
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self.insert_ignore_conflicts = insert_ignore_conflicts
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def create(self, cnx, args) -> int:
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"create object in table"
vals = dictfilter(args, self.dbfields, self.filter_nulls)
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if self.id_name in vals:
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del vals[self.id_name]
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if "id" in vals:
del vals["id"]
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if self.filter_dept:
vals["dept_id"] = g.scodoc_dept_id
if (
self.html_quote
): # quote all HTML markup (une bien mauvaise idée venue des ages obscurs)
quote_dict(vals)
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# format value
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for title in vals:
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if title in self.input_formators:
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vals[title] = self.input_formators[title](vals[title])
# insert
new_id = DBInsertDict(
cnx,
self.table_name,
vals,
commit=True,
return_id=(self.id_name is not None),
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ignore_conflicts=self.insert_ignore_conflicts,
)
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return new_id
def delete(self, cnx, oid, commit=True):
"delete tuple"
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DBDelete(cnx, self.table_name, oid, commit=commit)
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def list(
self,
cnx,
args={},
operator="and",
test="=",
sortkey=None,
disable_formatting=False,
limit="",
offset="",
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):
"returns list of dicts"
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id_value = args.get(self.id_name)
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vals = dictfilter(args, self.dbfields, self.filter_nulls)
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if (id_value is not None) and (not "id" in vals):
vals["id"] = id_value
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if self.filter_dept:
vals["dept_id"] = g.scodoc_dept_id
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if not sortkey:
sortkey = self.sortkey
res = DBSelectArgs(
cnx,
self.table_name,
vals,
sortkey=sortkey,
test=test,
operator=operator,
aux_tables=self.aux_tables,
id_name=self.id_name,
limit=limit,
offset=offset,
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)
for r in res:
self.format_output(r, disable_formatting=disable_formatting)
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# Add ScoDoc7 id:
if "id" in r:
r[self.id_name] = r["id"]
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return res
def format_output(self, r, disable_formatting=False):
"Format dict using provided output_formators"
for k, v in r.items():
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if v is None and self.convert_null_outputs_to_empty:
v = ""
# format value
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if not disable_formatting and k in self.output_formators:
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try: # XXX debug "isodate"
v = self.output_formators[k](v)
except:
log("*** list: vars=%s" % str(vars()))
log("*** list: r=%s" % str(r))
raise
r[k] = v
def edit(self, cnx, args, html_quote=None):
"""Change fields"""
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# assert self.id_name in args
oid = args[self.id_name]
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vals = dictfilter(args, self.dbfields, self.filter_nulls)
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vals["id"] = oid
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html_quote = html_quote or self.html_quote
if html_quote:
quote_dict(vals) # quote HTML
# format value
for title in vals.keys():
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if title in self.input_formators:
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try:
vals[title] = self.input_formators[title](vals[title])
except:
log("exception while converting %s=%s" % (title, vals[title]))
raise
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DBUpdateArgs(
cnx,
self.table_name,
vals,
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where="id=%(id)s",
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commit=True,
)
def dictfilter(d, fields, filter_nulls=True):
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"""returns a copy of d with only keys listed in "fields" and non null values"""
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r = {}
for f in fields:
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if f in d and (d[f] != None or not filter_nulls):
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try:
val = d[f].strip()
except:
val = d[f]
r[f] = val
return r
# --------------------------------------------------------------------
# --- Misc Tools
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def DateDMYtoISO(dmy: str, null_is_empty=False) -> str: # XXX deprecated
"""Convert date string from french format to ISO.
If null_is_empty (default false), returns "" if no input.
"""
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if not dmy:
if null_is_empty:
return ""
else:
return None
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if hasattr(dmy, "strftime"):
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return dmy.strftime("%Y-%m-%d")
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if not isinstance(dmy, str):
raise ScoValueError(f'Date (j/m/a) invalide: "{dmy}"')
try:
dt = datetime.datetime.strptime(dmy, "%d/%m/%Y")
except ValueError as exc:
raise ScoValueError(f'Date (j/m/a) invalide: "{dmy}"') from exc
return dt.date().isoformat()
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def DateISOtoDMY(isodate):
if not isodate:
return ""
arg = isodate # debug
# si isodate est une instance de DateTime !
try:
isodate = "%s-%s-%s" % (isodate.year(), isodate.month(), isodate.day())
# log('DateISOtoDMY: converted isodate to iso !')
except:
pass
# drop time from isodate and split
t = str(isodate).split()[0].split("-")
if len(t) != 3:
# XXX recherche bug intermittent assez etrange
log('*** DateISOtoDMY: invalid isodate "%s" (arg="%s")' % (str(isodate), arg))
raise NoteProcessError(
'invalid isodate: "%s" (arg="%s" type=%s)' % (str(isodate), arg, type(arg))
)
year, month, day = t
year = int(year)
month = int(month)
day = int(day)
if month < 1 or month > 12:
raise ValueError("invalid month")
if day < 1 or day > 31:
raise ValueError("invalid day")
return "%02d/%02d/%04d" % (day, month, year)
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def TimetoISO8601(t, null_is_empty=False) -> str:
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"convert time string to ISO 8601 (allow 16:03, 16h03, 16)"
if isinstance(t, datetime.time):
return t.isoformat()
if not t and null_is_empty:
return ""
t = t.strip().upper().replace("H", ":")
if t and t.count(":") == 0 and len(t) < 3:
t = t + ":00"
return t
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def TimefromISO8601(t) -> str:
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"convert time string from ISO 8601 to our display format"
if not t:
return t
# XXX strange bug turnaround...
try:
t = "%s:%s" % (t.hour(), t.minute())
# log('TimefromISO8601: converted isotime to iso !')
except:
pass
fs = str(t).split(":")
return fs[0] + "h" + fs[1] # discard seconds
def float_null_is_zero(x):
if x is None or x == "":
return 0.0
else:
return float(x)
def int_null_is_zero(x):
if x is None or x == "":
return 0
else:
return int(x)
def int_null_is_null(x):
if x is None or x == "":
return None
else:
return int(x)
def float_null_is_null(x):
if x is None or x == "":
return None
else:
return float(x)
# post filtering
#
def UniqListofDicts(L, key):
"""L is a list of dicts.
Remove from L all items which share the same key/value
"""
# well, code is simpler than documentation:
d = {}
for item in L:
d[item[key]] = item
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return list(d.values())
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#
def copy_tuples_changing_attribute(
cnx, table, column, old_value, new_value, to_exclude=[]
):
"""Duplicate tuples in DB table, replacing column old_value by new_value
Will raise exception if violation of integerity constraint !
"""
cursor = cnx.cursor(cursor_factory=ScoDocCursor)
cursor.execute(
"select * from %s where %s=%%(old_value)s" % (table, column),
{"old_value": old_value},
)
res = cursor.dictfetchall()
for t in res:
t[column] = new_value
for c in to_exclude:
del t[c]
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_ = DBInsertDict(cnx, table, t, convert_empty_to_nulls=False)