{"id":92107,"date":"2020-08-23T07:42:16","date_gmt":"2020-08-23T05:42:16","guid":{"rendered":"https:\/\/prohoster.info\/blog\/administrirovanie\/etyud-po-realizaczii-row-level-secutity-v-postgresql"},"modified":"2020-08-23T07:42:16","modified_gmt":"2020-08-23T05:42:16","slug":"etyud-po-realizaczii-row-level-secutity-v-postgresql","status":"publish","type":"post","link":"https:\/\/prohoster.info\/lv\/blog\/administrirovanie\/etyud-po-realizaczii-row-level-secutity-v-postgresql","title":{"rendered":"Et\u012bde par Row Level Security ievie\u0161anu PostgreSQL","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

K\u0101 papildin\u0101jumu Studija par biznesa lo\u0123ikas realiz\u0101ciju PostgreSQL uzglab\u0101\u0161anas funkciju l\u012bmen\u012b<\/a><\/noindex> un galvenok\u0101rt detaliz\u0113tai atbildei<\/b> uz koment\u0101rs<\/a><\/noindex>.<\/p>\n

Teor\u0113tisk\u0101 da\u013ca ir lieliski aprakst\u012bta dokument\u0101cij\u0101 Postgres Pro<\/a><\/noindex> \u2014 Rindu aizsardz\u012bbas politikas<\/a><\/noindex>. Zem\u0101k tiks apl\u016bkota praktisk\u0101 maza konkr\u0113t\u0101 biznesa uzdevuma \u2014 dz\u0113sto datu sl\u0113p\u0161anas.<\/b> Studija, kas velt\u012bta Lomu mode\u013ca realiz\u0101cijai, izmantojot RLS<\/a><\/noindex><\/b> ir atsevi\u0161\u0137i izkl\u0101st\u012bta.<\/p>\n

\"Et\u012bde<\/p>\n

Rakst\u0101 nav nekas jauns, nav sl\u0113pta j\u0113ga vai nosl\u0113pumu. T\u0101 ir vienk\u0101r\u0161a piez\u012bme par praktisk\u0101s realiz\u0101cijas teor\u0113tisko ideju. Ja k\u0101du interes\u0113 \u2014 lasiet. Kam neinteres\u0113 \u2014 net\u0113r\u0113jiet savu laiku velti.<\/p><\/blockquote>\n

<\/a><\/noindex><\/p>\n

Uzdevuma formul\u0113\u0161ana<\/h3>\n

\nNedzi\u013cinoties dzi\u013ci t\u0113m\u0101, \u012bsi, uzdevumu var formul\u0113t \u0161\u0101di: ir tabula, kas realiz\u0113 noteiktu biznesa ent\u012btiju. Rindas tabul\u0101 var tikt dz\u0113stas, bet fiziski dz\u0113st rindas nav at\u013cauts, t\u0101s ir j\u0101sl\u0113pj. <\/p>\n

Jo ir teikts \u2014 \u201cNeko nem\u0101c\u012bties, tikai p\u0101rd\u0113v\u0113t. Internets saglab\u0101 VISU\u201d <\/b><\/p>\n

<\/i> Ide\u0101li v\u0113lams neb\u016bt p\u0101rrakst\u012bt jau eso\u0161\u0101s glab\u0101\u0161anas funkcijas, kas str\u0101d\u0101 ar \u0161o ent\u012btiju.<\/p>\n

\u0160\u012bs koncepcijas \u012bsteno\u0161anai tabulai ir atrib\u016bts is_deleted<\/i>. T\u0101l\u0101k viss ir vienk\u0101r\u0161i \u2014 ir j\u0101pan\u0101k, lai klients redz\u0113tu tikai rindas, kur\u0101s atrib\u016bts is_deleted<\/i> ir nepatiesi. T\u0101p\u0113c tiek izmantots meh\u0101nisms Rindu l\u012bme\u0146a dro\u0161\u012bba.<\/b><\/p>\n

Realiz\u0101cija<\/h3>\n

\nIzveidojam atsevi\u0161\u0137u lomu un sh\u0113mu<\/p>\n

CREATE ROLE repos;\nCREATE SCHEMA repos;<\/code><\/pre>\n
\nIzveidojam m\u0113r\u0137a tabulu<\/p>\n
CREATE TABLE repos.file\n(\n...\nis_del BOOLEAN DEFAULT FALSE\n);\nCREATE SCHEMA repos<\/code><\/pre>\n
\nIesl\u0113dzam Rindu l\u012bme\u0146a dro\u0161\u012bbu<\/i><\/p>\n
ALTER TABLE repos.file ENABLE ROW LEVEL SECURITY;\nCREATE POLICY file_invisible_deleted ON repos.file FOR ALL TO dba_role USING (NOT is_deleted);\nGRANT ALL ON TABLE repos.file to dba_role;\nGRANT USAGE ON SCHEMA repos TO dba_role;<\/code><\/pre>\n
\nServisa funkcija<\/b> \u2014 rinda dz\u0113\u0161ana tabul\u0101<\/p>\n
CREATE OR REPLACE repos.delete(curr_id repos.file.id%TYPE)\nRETURNS integer AS $$\nBEGIN\n...\nUPDATE repos.file\nSET is_del = TRUE\nWHERE id = curr_id;\n...\nEND\n$$ LANGUAGE plpgsql SECURITY DEFINER;<\/code><\/pre>\n
\nBiznesa funkcija<\/b> \u2014 dokumenta dz\u0113\u0161ana<\/p>\n
CREATE OR REPLACE business_functions.deleteDoc(doc_for_delete JSON)\nRETURNS JSON AS $$\nBEGIN\n...\nPERFORM repos.delete(doc_id);\n...\nEND\n$$ LANGUAGE plpgsql SECURITY DEFINER;<\/code><\/pre>\n
<\/p>\n
Rezult\u0101ti<\/h3>\n
\nKlients dz\u0113\u0161 dokumentu<\/p>\n
SELECT business_functions.delCFile((SELECT json_build_object('CId', 3)));<\/code><\/pre>\n
\nP\u0113c dz\u0113\u0161anas klients dokumentu neredz<\/p>\n
SELECT business_functions.getCFile( (SELECT json_build_object( 'CId', 3 )) ) ;\n-----------------\n(0 rows)<\/code><\/pre>\n
\nBet datu b\u0101z\u0113 dokuments netika dz\u0113sts, tikai atrib\u016bts main\u012bts is_del<\/i><\/p>\n
psql -d my_db\nSELECT id, name, is_del FROM repos.file;\nid | name | is_del\n--+---------+------------\n1 | test_1 | t\n(1 row)<\/code><\/pre>\n
\nKas ar\u012b bija pras\u012btaj\u0101 uzdevum\u0101. <\/p>\n
Rezult\u0101ts<\/h2>\n
\nJa, ja ir interesanta t\u0113ma, n\u0101kamaj\u0101 et\u016bd\u0113 varam par\u0101d\u012bt piek\u013cuves datiem sadal\u012b\u0161anas lomu mode\u013ca \u012bsteno\u0161anas piem\u0113ru, izmantojot Rindu l\u012bme\u0146a dro\u0161\u012bbu.
\n
Avots: habr.com<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"
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