switch to another postgresql python library (from pgsql to psycopg)

Switch to a library which is more well-known.
I also thought the library was the problem for not being able to
template in a JSON path, but that is just a PostgreSQL problem it seems.

README.md

@@ -85,19 +85,15 @@ To configure the Postgres database connection and the SMTP parameters to send ma
 For the SMTP connection, the code assumes a standard submission protocol setup with enable StartTLS and authentication,
 so you will need to configure a username and password.
 
-| Variable          | Default               | Description                         |
+| Variable            | Default                                              | Description                                                                                                                                                      |
-|-------------------|-----------------------|-------------------------------------|
+|---------------------|------------------------------------------------------|------------------------------------------------------------------------------------------------------------------------------------------------------------------|
-| POSTGRES_DATABASE | hedgedoc              | database to connect to              |
+| POSTGRES_CONNSTRING | postgresql://hedgedoc:geheim@localhost:5432/hedgedoc | [PostgreSQL connection string](https://www.postgresql.org/docs/current/libpq-connect.html#LIBPQ-CONNSTRING) specifying where and how to connnect to the database |
-| POSTGRES_HOSTNAME | localhost             | host of the database server         |
+| SMTP_FROM           |                                                      | sender address for the expiry mails                                                                                                                              |
-| POSTGRES_PASSWORD | geheim                | password for the database           |
+| SMTP_HOSTNAME       | localhost                                            | mail server hostname                                                                                                                                             |
-| POSTGRES_PORT     | 5432                  | port number of the database server  |
+| SMTP_PASSWORD       |                                                      | SMTP password                                                                                                                                                    |
-| POSTGRES_USERNAME | hedgedoc              | username for the database           |
+| SMTP_PORT           | 587                                                  | port to connect to                                                                                                                                               |
-| SMTP_FROM         |                       | sender address for the expiry mails |
+| SMTP_USERNAME       |                                                      | SMTP username                                                                                                                                                    |
-| SMTP_HOSTNAME     | localhost             | mail server hostname                |
+| URL                 | http://localhost:3000                                | base URL for linking to notes                                                                                                                                    |
-| SMTP_PASSWORD     |                       | SMTP password                       |
-| SMTP_PORT         | 587                   | port to connect to                  |
-| SMTP_USERNAME     |                       | SMTP username                       |
-| URL               | http://localhost:3000 | base URL for linking to notes       |
 
 ## Local Development Setup
 

docker-compose.yaml

@@ -48,7 +48,7 @@ services:
     image: hedgedoc-expire
     command: "-v -r .001 -n .001 check"
     environment:
-      - "POSTGRES_HOSTNAME=database"
+      - "POSTGRES_CONNSTRING=postgres://hedgedoc:geheim@database:5432/hedgedoc"
     depends_on:
       - database
 

hedgedoc-expire.py

@@ -14,7 +14,8 @@ from textwrap import dedent
 from time import sleep
 
 import humanize
-import pgsql
+import psycopg
+from psycopg.rows import dict_row
 
 
 class Config:
@@ -28,11 +29,7 @@ class Config:
         self.note_age = timedelta(days=95)
         self.exclude = []
 
-        self.postgres_hostname = getenv('POSTGRES_HOSTNAME', 'localhost')
+        self.postgres_connection_string = getenv('POSTGRES_CONNSTRING', 'postgresql://hedgedoc:geheim@localhost:5432/hedgedoc')
-        self.postgres_username = getenv('POSTGRES_USERNAME', 'hedgedoc')
-        self.postgres_password = getenv('POSTGRES_PASSWORD', 'geheim')
-        self.postgres_database = getenv('POSTGRES_DATABASE', 'hedgedoc')
-        self.postgres_port = int(getenv('POSTGRES_PORT', '5432'))
 
         self.smtp_hostname = getenv('SMTP_HOSTNAME', 'localhost')
         self.smtp_port = int(getenv('SMTP_PORT', '587'))
@@ -95,14 +92,14 @@ class HedgedocExpire:
         profile = json.loads(row['profile'])
         return profile['emails'][0]
 
-    def notes_to_be_expired(self, db) -> list[any]:
+    def notes_to_be_expired(self, conn) -> list[any]:
         """
         Get a list of all notes to be expired.
         :return:
         """
-        notes = []
         cutoff = datetime.now(timezone.utc) - self.config.note_age
-        with db.prepare('''SELECT
+        with conn.cursor(row_factory=dict_row) as cur:
+            cur.execute('''SELECT
                             "Notes"."alias",
                             "Notes"."content",
                             "Notes"."createdAt",
@@ -114,34 +111,21 @@ class HedgedocExpire:
                             "Users"."email",
                             "Users"."profile"
                         FROM "Notes", "Users"
-                        WHERE "Notes"."updatedAt" < $1
+                        WHERE "Notes"."updatedAt" < %s
                           AND "Notes"."ownerId" = "Users"."id"
                         ORDER BY "Notes"."updatedAt"
-                        ''') as notes_older_than:
+                        ''', [cutoff])
-            for row in notes_older_than(cutoff):
+            return cur.fetchall()
-                notes.append({
-                    'alias': row.alias if row.alias is not None else row.shortid,
-                    'content': row.content,
-                    'createdAt': row.createdAt,
-                    'email': row.email,
-                    "id": row.id,
-                    'ownerId': row.ownerId,
-                    'profile': row.profile,
-                    'shortid': row.shortid,
-                    'title': row.title,
-                    'updatedAt': row.updatedAt
-                })
-        return notes
 
-    def revisions_to_be_expired(self, db) -> list[any]:
+    def revisions_to_be_expired(self, conn) -> list[any]:
         """
         Obtain a list of revisions to be expired.
-        :param db: the database connection
+        :param conn: the database connection
         :return:
         """
-        revisions = []
         cutoff = datetime.now(timezone.utc) - self.config.revision_age
-        with db.prepare('''SELECT
+        with conn.cursor(row_factory=dict_row) as cur:
+            cur.execute('''SELECT
                             "Notes"."alias",
                             "Revisions"."createdAt",
                             "Users"."email",
@@ -151,40 +135,29 @@ class HedgedocExpire:
                             "Notes"."shortid" as "shortid",
                             "Notes"."title"
                         FROM "Revisions", "Notes", "Users" 
-                        WHERE "Revisions"."createdAt" < $1 
+                        WHERE "Revisions"."createdAt" < %s
                           AND "Revisions"."noteId" = "Notes"."id"
                           AND "Notes"."ownerId" = "Users"."id"
                         ORDER BY "Notes"."createdAt", "Revisions"."createdAt"
-                    ''') as revs_older_than:
+                    ''', [cutoff])
-            for row in revs_older_than(cutoff):
+            return cur.fetchall()
-                revisions.append({
-                    'alias': row.alias,
-                    'createdAt': row.createdAt,
-                    'email': row.email,
-                    'noteId': row.noteId,
-                    'profile': row.profile,
-                    'revisionId': row.revisionId,
-                    'shortid': row.shortid,
-                    'title': row.title
-                })
-        return revisions
 
-    def check_notes_to_be_expired(self, db) -> str:
+    def check_notes_to_be_expired(self, conn) -> str:
         """
         Return a list of notes that will be expired.
-        :param db: the database connection
+        :param conn: the database connection
         :return: a multi-line text suitable for humans to read
         """
         r = ''
         cutoff = datetime.now(timezone.utc) - self.config.note_age
         r += f'Notes to be deleted not changed since {cutoff} ({humanize.naturaldelta(self.config.note_age)}):\n'
-        for note in self.notes_to_be_expired(db):
+        for note in self.notes_to_be_expired(conn):
-            age = datetime.now(timezone.utc) - datetime.fromisoformat(note['updatedAt'])
+            age = datetime.now(timezone.utc) - note['updatedAt']
             url = self.config.url + '/' + (note["alias"] if note["alias"] is not None else note["shortid"])
             r += f'    {self.email_from_email_or_profile(note)} ({humanize.naturaldelta(age)}) {url}: {note["title"]}\n'
         return r
 
-    def check_revisions_to_be_expired(self, db) -> str:
+    def check_revisions_to_be_expired(self, conn) -> str:
         """
         Return a list of revisions that will be expired.
         :return: a multi-line text suitable for humans to read
@@ -193,8 +166,8 @@ class HedgedocExpire:
         cutoff = datetime.now(timezone.utc) - self.config.revision_age
         r += f'Revisions to be deleted created before {cutoff} ({humanize.naturaldelta(self.config.revision_age)}):\n'
         notes = {}
-        for row in self.revisions_to_be_expired(db):
+        for row in self.revisions_to_be_expired(conn):
-            row['age'] = datetime.now(timezone.utc) - datetime.fromisoformat(row['createdAt'])
+            row['age'] = datetime.now(timezone.utc) - row['createdAt']
             if row['noteId'] not in notes:
                 notes[row['noteId']] = []
             notes[row['noteId']].append(row)
@@ -207,16 +180,16 @@ class HedgedocExpire:
                 r += f'        {humanize.naturaldelta(rev["age"])}: {rev["revisionId"]}\n'
         return r
 
-    def expire_old_notes(self, db) -> None:
+    def expire_old_notes(self, conn) -> None:
         """
         Email old notes to their owners, then delete them.
-        :param db: the database connection
+        :param conn: the database connection
         :return:
         """
-        with db.prepare('DELETE FROM "Notes" WHERE "id" = $1') as delete_statement:
+        with conn.cursor() as cur:
-            for note in self.notes_to_be_expired(db):
+            for note in self.notes_to_be_expired(conn):
                 try:
-                    note_age = datetime.now(timezone.utc) - datetime.fromisoformat(note['updatedAt'])
+                    note_age = datetime.now(timezone.utc) - note['updatedAt']
                     msg = MIMEMultipart()
                     msg['From'] = self.email_sender.mail_from
                     msg['To'] = self.email_from_email_or_profile(note)
@@ -240,7 +213,8 @@ class HedgedocExpire:
                     self.email_sender.send(msg)
 
                     # email backup of the note sent, now we can delete it
-                    delete_statement(note["id"])
+                    cur.execute('DELETE FROM "Notes" WHERE "id" = %s', [note["id"]])
+                    conn.commit()
 
                     if self.config.verbose:
                         url = self.config.url + '/' + (note["alias"] if note["alias"] is not None else note["shortid"])
@@ -248,43 +222,42 @@ class HedgedocExpire:
                 except Exception as e:
                     print(f'Unable to send email to {self.email_from_email_or_profile(note)}: {e}', file=sys.stderr)
 
-    def expire_old_revisions(self, db) -> None:
+    def expire_old_revisions(self, conn) -> None:
         """
         Removes all revision on all notes that have been modified earlier than age.
-        :param db: the database connection
+        :param conn: the database connection
         :return:
         """
         cutoff = datetime.now(timezone.utc) - self.config.revision_age
-        with db.prepare('DELETE FROM "Revisions" WHERE "createdAt" < $1 RETURNING id') as delete:
+        with conn.cursor() as cur:
-            rows = list(delete(cutoff))
+            rows = list(cur.execute('DELETE FROM "Revisions" WHERE "createdAt" < %s RETURNING id', [cutoff]))
             if self.config.verbose:
                 print(f'Deleted {len(rows)} old revisions')
+            conn.commit()
 
     def cmd_check(self) -> None:
-        with pgsql.Connection((self.config.postgres_hostname, self.config.postgres_port),
+        with psycopg.connect(self.config.postgres_connection_string) as conn:
-                              self.config.postgres_username, self.config.postgres_password) as db:
             if 'revision' not in self.config.exclude:
-                print(self.check_revisions_to_be_expired(db))
+                print(self.check_revisions_to_be_expired(conn))
             elif self.config.verbose:
                 print("Revisions were excluded from check, not checking.\n")
                 
             if 'note' not in self.config.exclude:
-                print(self.check_notes_to_be_expired(db))
+                print(self.check_notes_to_be_expired(conn))
             elif self.config.verbose:
                 print("Notes were excluded from check, not checking.\n")
 
     def cmd_emailcheck(self) -> None:
-        with pgsql.Connection((self.config.postgres_hostname, self.config.postgres_port),
+        with psycopg.connect(self.config.postgres_connection_string) as conn:
-                              self.config.postgres_username, self.config.postgres_password) as db:
             report = ''
 
             if 'revision' not in self.config.exclude:
-                report += self.check_revisions_to_be_expired(db)
+                report += self.check_revisions_to_be_expired(conn)
             else:
                 report += "Revisions were excluded from check.\n"
 
             if 'note' not in self.config.exclude:
-                report += self.check_notes_to_be_expired(db)
+                report += self.check_notes_to_be_expired(conn)
             else:
                 report += "Notes were excluded from check.\n"
         msg = MIMEMultipart()
@@ -301,15 +274,14 @@ class HedgedocExpire:
         self.email_sender.send(msg)
 
     def cmd_expire(self) -> None:
-        with pgsql.Connection((self.config.postgres_hostname, self.config.postgres_port),
+        with psycopg.connect(self.config.postgres_connection_string) as conn:
-                              self.config.postgres_username, self.config.postgres_password) as db:
             if 'revision' not in self.config.exclude:
-                self.expire_old_revisions(db)
+                self.expire_old_revisions(conn)
             elif self.config.verbose:
                 print("Revisions were excluded from action, not expiring.\n")
 
             if 'note' not in self.config.exclude:
-                self.expire_old_notes(db)
+                self.expire_old_notes(conn)
             elif self.config.verbose:
                 print("Notes were excluded from action, not expiring.\n")
 

poetry.lock

@@ -15,16 +15,125 @@ files = [
 tests = ["freezegun", "pytest", "pytest-cov"]
 
 [[package]]
-name = "pgsql"
+name = "psycopg"
-version = "2.2"
+version = "3.2.3"
-description = "PostgreSQL client library for Python 3"
+description = "PostgreSQL database adapter for Python"
 optional = false
-python-versions = ">=3.11"
+python-versions = ">=3.8"
 files = [
-    {file = "pgsql-2.2-py3-none-any.whl", hash = "sha256:12d3360645089d2ee6ab04dd8b9a03aeb7092e3459323f9553252bf4b8bdd2ed"},
+    {file = "psycopg-3.2.3-py3-none-any.whl", hash = "sha256:644d3973fe26908c73d4be746074f6e5224b03c1101d302d9a53bf565ad64907"},
+    {file = "psycopg-3.2.3.tar.gz", hash = "sha256:a5764f67c27bec8bfac85764d23c534af2c27b893550377e37ce59c12aac47a2"},
+]
+
+[package.dependencies]
+psycopg-binary = {version = "3.2.3", optional = true, markers = "implementation_name != \"pypy\" and extra == \"binary\""}
+typing-extensions = {version = ">=4.6", markers = "python_version < \"3.13\""}
+tzdata = {version = "*", markers = "sys_platform == \"win32\""}
+
+[package.extras]
+binary = ["psycopg-binary (==3.2.3)"]
+c = ["psycopg-c (==3.2.3)"]
+dev = ["ast-comments (>=1.1.2)", "black (>=24.1.0)", "codespell (>=2.2)", "dnspython (>=2.1)", "flake8 (>=4.0)", "mypy (>=1.11)", "types-setuptools (>=57.4)", "wheel (>=0.37)"]
+docs = ["Sphinx (>=5.0)", "furo (==2022.6.21)", "sphinx-autobuild (>=2021.3.14)", "sphinx-autodoc-typehints (>=1.12)"]
+pool = ["psycopg-pool"]
+test = ["anyio (>=4.0)", "mypy (>=1.11)", "pproxy (>=2.7)", "pytest (>=6.2.5)", "pytest-cov (>=3.0)", "pytest-randomly (>=3.5)"]
+
+[[package]]
+name = "psycopg-binary"
+version = "3.2.3"
+description = "PostgreSQL database adapter for Python -- C optimisation distribution"
+optional = false
+python-versions = ">=3.8"
+files = [
+    {file = "psycopg_binary-3.2.3-cp310-cp310-macosx_12_0_x86_64.whl", hash = "sha256:965455eac8547f32b3181d5ec9ad8b9be500c10fe06193543efaaebe3e4ce70c"},
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+]
+
+[[package]]
+name = "typing-extensions"
+version = "4.12.2"
+description = "Backported and Experimental Type Hints for Python 3.8+"
+optional = false
+python-versions = ">=3.8"
+files = [
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+]
+
+[[package]]
+name = "tzdata"
+version = "2024.2"
+description = "Provider of IANA time zone data"
+optional = false
+python-versions = ">=2"
+files = [
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 ]
 
 [metadata]
 lock-version = "2.0"
 python-versions = "^3.11"
-content-hash = "bc794458508ceedfc18e9635ad18b7113d5118c414698ebc12762c782ed3670d"
+content-hash = "6ef91abe2e2acfa0b7355dca99bfd6595e18bf90609c323f1857f13a1df73aaf"

pyproject.toml

@@ -7,8 +7,8 @@ readme = "README.md"
 
 [tool.poetry.dependencies]
 python = "^3.11"
-pgsql = "^2.2"
 humanize = "^4.9.0"
+psycopg = {extras = ["binary"], version = "^3.2.3"}
 
 
 [build-system]