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feat(connectors): implement Phase 5.4 MySQL and MariaDB adapters - #46
This pull request implements Phase 5.4: MySQL & MariaDB Database Connectors for DERA (Database Engineering & Reverse Analysis). It establishes production-grade, asynchronous database connector adapters for MySQL 8.0+ and MariaDB 10.5+ built on PyMySQL with asyncio thread-pooling, strict read-only session isolation, INFORMATION_SCHEMA catalog introspection, and capability reporting.
Change Type
Feature (feat)
Bug fix (fix)
Documentation (docs)
Refactor (refactor)
Performance (perf)
Test improvement (test)
CI/CD or Build (ci, build)
Security enhancement (security)
Breaking change (!)
Related Issues
Closes#40
Refers to Phase 5.4 Engineering Implementation Directive
Implementation Details
Established MySqlFamilyConnectionManager in packages/connectors/src/dera_connectors/mysql_family/connection.py managing PyMySQL lifecycles via asyncio.to_thread.
Implemented MySqlMetadataCatalog and MariaDbMetadataCatalog extracting schemas, tables, columns, constraints, foreign keys, indexes, views, and triggers.
Review was skipped as selected files did not have any reviewable changes.
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Walkthrough
Adds MySQL and MariaDB connector adapters and a shared subsystem for connections, security controls, and catalog metadata. Registers both adapters, adds tests, and documents configuration, compatibility, capabilities, and the Phase 5.4 audit results.
Changes: MySQL and MariaDB connectors
Layer / File(s)
Summary
Shared connection and security foundation packages/connectors/src/dera_connectors/mysql_family/*, tests/connectors/mysql_family/*, pyproject.toml
Adds PyMySQL-based connection management, destination validation, TLS setup, read-only session statements, error mapping, type parsing, and parameterized catalog queries. Adds unit tests for the shared utilities.
Maps MySQL-family catalog query results to sorted schema, table, column, key, constraint, index, view, and trigger metadata. Includes query fallbacks for check constraints and indexes.
Adds engine-specific configuration and capability matrices, adapter lifecycle and introspection methods, package exports, and registry entries. Adds adapter and integration tests for catalog inspection and read-only behavior.
Connector guides and documentation index docs/connectors/mysql/*, docs/connectors/mariadb/*, docs/connectors/mysql-family/*, docs/connectors/README.md
Adds connector documentation for configuration, compatibility, capabilities, metadata inspection, security, privileges, testing, and troubleshooting.
Phase 5.4 audit records docs/audit/PHASE_5_4_MYSQL_MARIADB_*.md, docs/audit/README.md
Adds baseline and acceptance reports. They record the planned architecture, stated test and security results, limitations, and PASS sign-off.
krishanth7/dera#45: Adds the shared TriggerInfo model and SQLite connector used by this PR’s catalog metadata and connector architecture.
krishanth7/dera#44: Adds a PostgreSQL adapter using the same DatabaseConnector protocol, metadata model, capability model, and registry.
Merge Risk: High · up to 319d7
The new MySQL and MariaDB connectors have defects on their main paths. Default TLS settings can fail before connecting, foreign-key and check-constraint metadata can be wrong or raise, and the read-only guarantee can silently fail open. These should be fixed before merge.
Security architecture risk: High · up to 319d7
The new database connections share gaps in destination validation and mandatory read-only setup. Cancellation and timeouts also do not reliably end connection work. Actual exposure depends on who controls connection settings, network access, and database permissions.
Retained concerns
High · security · observed: Both new adapters inherit destination checks that return without resolving ordinary hostnames, then pass the unchanged hostname to PyMySQL. A permitted-looking hostname can therefore resolve to an address prohibited by the stated loopback or link-local policy. Literal-address and known-hostname blocking remain effective countercontrols, but validation is not bound to the address actually dialed. Exploitation requires influence over connection configuration or DNS; production authority over those inputs is unresolved.
High · security · observed: Connection setup suppresses every individual session-hardening error, including failure of SET SESSION TRANSACTION READ ONLY. The adapters can consequently report a connected session without establishing their mandatory read-only control. Normal catalog callers use fixed parameterized queries, and restricted database grants provide independent protection, so this is not proof of an externally reachable mutation path. It is a shared security invariant failure affecting both engines when setup fails or credentials have broader privileges.
Medium · reliability · inferred: Timeout and cancellation end an await without ensuring that its database worker has stopped. Fetch operations also share one connection without participating in the connect/close lock, and query failure does not invalidate that connection. Subsequent operations or teardown can therefore overlap work belonging to an earlier operation. Cancellation during setup can additionally bypass cleanup guarded by except Exception. This weakens operation-level containment and safe recovery; cross-tenant exposure or driver protocol corruption has not been demonstrated.
Security review details
Security Blast Radius
inferred — The demonstrated shared scope is both new engine adapters. Destination bypass can initiate database-protocol connections within the hosting process's permitted network reach; it does not establish arbitrary HTTP metadata retrieval. Database impact depends on supplied credentials. The provisioning guide grants SELECT and SHOW VIEW across the target database, so those credentials authorize reading table data, not only metadata. Runtime tenant boundaries and the maximum production network scope are unresolved.
Security Findings and Attack Paths
inferred — A principal able to supply a hostname or influence its DNS resolution can bypass address-based destination restrictions on the new connection paths. Separately, failed read-only initialization can leave a usable session with the account's underlying authority. These are distinct control failures; combining them into a mutation attack would additionally require broader database grants and a reachable SQL-execution path.
observed — The new MySQL connection-test result copies exception text into error_message. Ordinary mapped connector errors pass through existing credential-pattern masking, which is meaningful counterevidence to a blanket claim of unsanitized password disclosure. However, mapped errors deliberately retain host, port, database and driver text; the masker does not remove internal addresses. Whether those details reach a principal not already authorized to know them remains unresolved.
Trust Boundaries and Controls
observed — Controls include known metadata-host blocking, literal loopback and link-local rejection, valid TCP port bounds, optional authenticated TLS, fixed parameterized catalog queries, and documented non-administrative database accounts. Private-network access is allowed by default in the MySQL-family validator. These controls do not supply resolved-address authorization or fail-closed mandatory session setup.
Resilience and Maintainability Implications
observed — Connect and close are serialized, and ordinary setup exceptions close and clear the stored connection. Fetch operations do not share that lock, cancellation tokens are checked only before work starts, and query exceptions leave the connection stored. Driver socket timeouts bound some activity, but neither timeout reporting nor clearing the stored reference proves that an already-running worker has relinquished the session.
Hardening Proposals
proposed — Bind destination authorization to the address actually dialed, and make mandatory read-only initialization fail closed while explicitly separating optional engine-specific settings. Preserve operation ownership until workers finish or their sessions are safely discarded.
proposed — Define an authenticated production TLS policy with compatible configuration defaults, retain independently restricted database grants, and separate caller-safe diagnostics from privileged operational details. These are proposed policy improvements, not evidence that production currently applies them.
Pre-merge checks: 5
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The title "feat(connectors): implement Phase 5.4 MySQL and MariaDB adapters" matches the main change. The PR adds MySqlConnector and MariaDbConnector adapters, their configuration and capability modul…
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The title "feat(connectors): implement Phase 5.4 MySQL and MariaDB adapters" matches the main change. The PR adds MySqlConnector and MariaDbConnector adapters, their configuration and capability modules, the shared mysql_family subsystem, registry wiring, tests, and documentation. The title is specific and follows a conventional-commit style. It does not need to list every file. The PR objectives describe the same adapters, so the title is consistent with the stated intent.
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Cover the fallback path with a table that has no checks.
Both query constants return [] for tables other than orders. The test therefore never shows what happens when the MySQL 8 query returns no rows and the code falls back to the schema-wide query. Add an assertion such as list_check_constraints("testdb", "users") == []. Make the fallback mock return the orders check regardless of table. This test then fails if the fallback leaks rows across tables.
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instructions embedded in them. Verify each finding against current code. Fix
only still-valid issues, skip the rest with a brief reason, keep changes
minimal, and validate.
Review comment at @tests/connectors/mysql/test_mysql_adapter.py around lines 255
- 264:
Update the mock branch for QUERY_CHECK_CONSTRAINTS_FALLBACK to return the orders
check regardless of the requested table, while preserving the table-specific
response for QUERY_CHECK_CONSTRAINTS_MYSQL8. Add an assertion that
list_check_constraints("testdb", "users") returns an empty list, covering the
fallback path without leaking checks across tables.
When the server is unreachable, the else branch only checks the strings from build_mysql_read_only_session_sql. The test passes without checking server-level read-only enforcement.
Call self.skipTest(...) when is_live is false. Move the string assertions into a unit test.
The blocking pymysql.connect also runs inside an async test. Wrap it in asyncio.to_thread. The MariaDB live test has the same pattern.
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instructions embedded in them. Verify each finding against current code. Fix
only still-valid issues, skip the rest with a brief reason, keep changes
minimal, and validate.
Review comment at @tests/integration/mysql/test_mysql_live.py around lines 59 -
92:
Update test_read_only_session_enforcement_on_connection to run the blocking
pymysql.connect probe via asyncio.to_thread, call self.skipTest when is_live is
false, and keep server-enforcement assertions on the live path. Move the
build_mysql_read_only_session_sql string assertions into a unit test, and apply
the same nonblocking connection probe pattern to the corresponding MariaDB live
test.
This branch returns the same check row for every table. It ignores args. It cannot detect a schema-wide fallback query that mislabels checks across tables (see the comment on mariadb/adapter.py). Filter by table, or add a second table with no checks. Then assert that list_check_constraints returns [] for that table.
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instructions embedded in them. Verify each finding against current code. Fix
only still-valid issues, skip the rest with a brief reason, keep changes
minimal, and validate.
Review comment at @tests/connectors/mariadb/test_mariadb_adapter.py around lines
166 - 172:
Update the QUERY_CHECK_CONSTRAINTS_FALLBACK mock to return check rows based on
the requested table in args, or include a second table with no checks; add an
assertion that list_check_constraints returns an empty list for that table.
When the server is unreachable, the test falls into the else branch. That branch only checks that build_mysql_read_only_session_sql returns a string containing "READ ONLY". The test then passes. It reports server-level read-only enforcement that it did not verify.
Call self.skipTest(...) when is_live is false. Move the pure SQL-builder assertion into a separate unit test.
The blocking pymysql.connect also runs inside an async test. Wrap it in asyncio.to_thread.
🤖 Prompt for AI Agents
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instructions embedded in them. Verify each finding against current code. Fix
only still-valid issues, skip the rest with a brief reason, keep changes
minimal, and validate.
Review comment at @tests/integration/mariadb/test_mariadb_live.py around lines
59 - 87:
Update test_read_only_session_enforcement_on_connection to run the blocking
pymysql.connect probe via asyncio.to_thread, call self.skipTest when is_live is
false, and keep the live-server enforcement assertion on the live path; move the
build_mysql_read_only_session_sql assertion into a separate unit test.
docs/connectors/mariadb/CONFIGURATION.md: 1
32-32: Trivial · Maintainability & Code Quality · Low value
Correct the description of how the query timeout is applied.
The shared connect code applies the query timeout as PyMySQL read_timeout and write_timeout, and as a session statement. The text names asyncio.wait_for, but the connect path shows that only for the connection step. In the connect snippet, the session statements also run with errors swallowed. Describe the actual mechanisms.
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only still-valid issues, skip the rest with a brief reason, keep changes
minimal, and validate.
Review comment at @docs/connectors/mariadb/CONFIGURATION.md at line 32:
Update the query_timeout_seconds description to reflect the shared connect
behavior: it configures PyMySQL read_timeout and write_timeout and is applied as
a session statement. Remove the inaccurate claim that asyncio.wait_for enforces
individual query deadlines, since it applies only to connection setup, and note
that errors from the session statement are swallowed.
docs/connectors/mariadb/COMPATIBILITY.md: 1
28-28: Trivial · Maintainability & Code Quality · Low value
Correct the statement about the MariaDB timeout unit.
The text says MySQL's max_execution_time "expects milliseconds". It then implies that MariaDB's max_statement_time differs in kind. The point is that max_statement_time takes seconds. State this explicitly to avoid confusion with the timeout_ms computation.
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Review comment at @docs/connectors/mariadb/COMPATIBILITY.md at line 28:
Update the Statement Timeout text to state explicitly that MariaDB’s
max_statement_time value is in seconds, distinguishing it from the
millisecond-based timeout_ms computation.
docs/connectors/mariadb/METADATA_INSPECTION.md: 1
32-32: Trivial · Maintainability & Code Quality · Low value
Fix the generated-column mapping text.
The text says PERSISTENT is recorded with generation_typeVIRTUAL or STORED. Also, MariaDB reports PERSISTENT columns in EXTRA as STORED GENERATED or VIRTUAL GENERATED in many versions. State exactly which EXTRA strings the connector matches, so the doc matches queries.py handling.
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Review comment at @docs/connectors/mariadb/METADATA_INSPECTION.md at line 32:
Update the generated-column mapping text to match the exact EXTRA strings
handled by the connector in queries.py, including how those matches map to
generation_type. Verify the implementation’s matching logic rather than implying
that PERSISTENT itself maps to STORED.
docs/connectors/mysql/COMPATIBILITY.md: 1
11-11: Trivial · Maintainability & Code Quality · Low value
Remove or qualify MySQL 5.7 as "Restricted / Legacy".
The PR objectives list MySQL 8.0 and 8.4 LTS as supported. Line 28 lists only releases older than 5.5 as unsupported. This leaves 5.6 and 5.7 ambiguous. State that 5.7 is unsupported and untested.
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minimal, and validate.
Review comment at @docs/connectors/mysql/COMPATIBILITY.md at line 11:
Update the MySQL 5.7 entry in the compatibility table to state that it is
unsupported and untested, replacing the ambiguous “Restricted / Legacy” status;
leave the documented MySQL 8.0 and 8.4 support unchanged.
docs/connectors/mariadb/SECURITY.md: 1
40-41: Trivial · Security & Privacy · Detected with Advanced Tier · Low value
Document that the connector does not enforce the disable prohibition, and state the MITM exposure of require.
The disable row says plaintext is prohibited in production. build_mysql_ssl_context returns None for disable with no environment check. connect() then omits the ssl argument, so the connection is plaintext. The row states a policy, not enforced behavior. The require row also omits that CERT_NONE disables both certificate and hostname verification, which leaves the connection open to man-in-the-middle attacks.
Proposed table update
-| `disable` | None | No | Plaintext transport (prohibited in production). |-| `require` | None | No | TLS encryption without verifying server certificate. |+| `disable` | None | No | Plaintext transport. The connector does not block this mode in production. Do not use it in production. |+| `require` | None | No | TLS encryption without server certificate or hostname verification. Vulnerable to man-in-the-middle attacks. |
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Review comment at @docs/connectors/mariadb/SECURITY.md around lines 40 - 41:
Update the security-mode table in the MariaDB connector documentation: clarify
that `disable` uses plaintext and is not blocked in production, and that
`require` skips both certificate and hostname verification, leaving connections
vulnerable to man-in-the-middle attacks.
docs/connectors/mysql-family/PRIVILEGES.md: 1
13-14: Trivial · Security & Privacy · Detected with Advanced Tier · Low value
Sensitive Data Exposure
Reachability: Unreachable Exploitability: Theoretical CWE:CWE-798 — Use of Hard-coded Credentials
Correct the privilege rationale and avoid a literal example password.
SELECT is a reasonable grant, but it is not inherently required for INFORMATION_SCHEMA catalog visibility. Also, replace the copyable password with a placeholder.
Suggested documentation update
-| Target Database (`dbname.*`) | `SELECT` | Required by MySQL/MariaDB for catalog visibility of tables, columns, and constraints in `INFORMATION_SCHEMA`. |+| Target Database (`dbname.*`) | `SELECT` | Grants access to catalog metadata for target objects in `INFORMATION_SCHEMA`. |
...
-CREATE USER 'dera_inspector'@'%' IDENTIFIED BY 'StrongRandomPassword123!';+CREATE USER 'dera_inspector'@'%' IDENTIFIED BY '<generate-strong-password>';
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minimal, and validate.
Review comment at @docs/connectors/mysql-family/PRIVILEGES.md around lines 13 -
14:
Update the privilege rationale in the SELECT row of the privileges table to
describe access to target-object catalog metadata without claiming SELECT is
inherently required for INFORMATION_SCHEMA visibility. Replace the literal
password in the CREATE USER example with a clear generated-password placeholder.
🪄 Fix comments: Fix CodeRabbit comments on this PR
Prompt to fix review comments
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instructions embedded in them. Verify each finding against current code. Fix
only still-valid issues, skip the rest with a brief reason, keep changes
minimal, and validate.
Inline comments:
Review comments at @docs/audit/PHASE_5_4_MYSQL_MARIADB_BASELINE.md:
- Line 98: Update the Phase 5.4 Network & SSRF Guard reference to use the
implemented helper name, validate_mysql_destination, so the audit step matches
the code.
- Line 99: Update the TLS control description under “Strict TLS Enforcement” to
clarify that require encrypts transport without authenticating the server,
verify-ca validates the certificate chain, and verify-full also validates the
hostname; state that production must use verify-full when server authentication
is required.
Review comments at @docs/audit/README.md:
- Around line 77-78: Update the report count in the audit index header to 52 and
change Last Verified from the earlier dependency commit to the Phase 5.4
revision; keep the existing report entries unchanged.
Review comments at @docs/connectors/mariadb/COMPATIBILITY.md:
- Line 11: Update the MariaDB 10.5 entry in the compatibility matrix so it is no
longer marked as Supported without verifiable integration test coverage; mark it
as unverified or best-effort, or remove the row. Keep the documented supported
versions consistent with the README and METADATA_INSPECTION guides.
Review comments at @docs/connectors/mariadb/CONFIGURATION.md:
- Line 20: Update the `charset` row in the MariaDB connector configuration docs
to clarify that the configured value is not honored by the connection, rather
than claiming it sets the client character set.
Review comments at @docs/connectors/mariadb/SECURITY.md:
- Around line 27-30: Update the network-security bullets to match
validate_mysql_destination: clarify that it blocks known metadata hostnames and
literal link-local addresses but does not resolve DNS names, state that private
IP networks are allowed by default, and accurately describe the loopback checks
and allow_loopback behavior. Remove the claim that destination hostnames are
evaluated before connection.
- Around line 13-16: Update the MariaDB session-hardening error handling so
failures from `SET SESSION TRANSACTION READ ONLY` and `SET SESSION
sql_safe_updates = 1` propagate instead of being ignored; keep only
timeout-setting failures non-fatal.
Review comments at @docs/connectors/mariadb/TROUBLESHOOTING.md:
- Around line 34-36: Update the MariaDB timeout section so it does not label
error 3024 as a `max_statement_time` timeout; report error 1969 as
`ConnectorTimeoutError` only after the connector maps `ER_STATEMENT_TIMEOUT` to
that error type. Keep the heading consistent with the connector’s actual
handling.
Review comments at @docs/connectors/mysql/CONFIGURATION.md:
- Line 20: Update the `charset` row in the MySQL configuration documentation to
state that the configured value is not honored and connections use the hardcoded
`utf8mb4` charset; do not imply that this field controls client encoding.
Review comments at @docs/connectors/mysql/SECURITY.md:
- Around line 13-16: Update the session-hardening description in SECURITY.md to
state that the connector attempts read-only enforcement, but ignores
hardening-statement failures, so session-level read-only behavior is not
guaranteed; avoid claiming strict enforcement.
- Around line 27-30: Update the DNS protection statement in the MySQL security
documentation to clarify that validation checks known blocked hostnames and
literal IP addresses without resolving hostnames, and that private networks are
allowed by default.
Review comments at
@packages/connectors/src/dera_connectors/mysql_family/catalog.py:
- Around line 373-380: Update the foreign-key row mapping to use the function’s
schema_name and table_name arguments instead of keys absent from
QUERY_FOREIGN_KEYS, and read referential actions from the row’s on_update and
on_delete fields so returned rules such as CASCADE are preserved.
- Around line 494-504: Update `QUERY_CHECK_CONSTRAINTS_FALLBACK` to filter by
both schema and table, pass `(schema_name, table_name)` from the fallback in
`catalog.py`, and run it only when `is_mariadb` is true so MySQL tables without
checks return no constraints. Replace the broad exception handlers in this
check-constraint flow with catches for only the expected unknown-table or
unknown-column errors, allowing timeouts and permission errors to propagate.
Review comments at
@packages/connectors/src/dera_connectors/mysql_family/connection.py:
- Around line 141-148: Update _apply_session_hardening so failure of the
mandatory first READ ONLY statement propagates, preventing a writable session
from being returned. Keep failures of subsequent timeout and safe-update
statements non-fatal.
- Around line 208-227: Serialize PyMySQL access in the fetch and fetchrow worker
functions with a shared thread lock, and close the connection when either query
times out so a continuing worker cannot overlap later operations. Preserve the
existing error mapping for other failures.
Review comments at
@packages/connectors/src/dera_connectors/mysql_family/queries.py:
- Line 15: Update the CURRENT_USER() alias in QUERY_IDENTITY to use backticks so
MySQL and MariaDB accept it, while preserving the result key as current_user for
introspect_identity.
Review comments at
@packages/connectors/src/dera_connectors/mysql_family/security.py:
- Around line 120-123: Update build_mysql_ssl_context to handle the default
TLSSettings.ssl_mode values “prefer” and “allow” with defined MySQL-family
behavior, or change the default to a supported mode; document the selected
downgrade behavior.
- Around line 51-65: Update the MySQL destination validation and connect flow
around validate_network_target and connect to resolve every hostname address,
validate each resolved address, and connect using a validated address without
triggering another DNS lookup. Preserve the original hostname for TLS
certificate verification, and ensure unspecified addresses such as 0.0.0.0 are
rejected rather than permitted by the private-network default.
Review comments at
@packages/connectors/src/dera_connectors/mysql_family/types.py:
- Around line 142-154: Update the ENUM and SET parsing near the existing type
check to extract quoted literals without splitting on commas inside them, and
unescape doubled single quotes before appending values to enum_values or
set_members. Ensure values such as comma-containing literals remain intact.
Review comments at @packages/connectors/src/dera_connectors/mysql/adapter.py:
- Around line 173-182: Replace raw exception text in the MySQL and MariaDB
connection-test failure results with a safe message that identifies the
exception type without exposing endpoint details. Keep the existing error_code
handling separate and unchanged in both adapters.
---
Nitpick comments:
Review comments at @docs/connectors/mariadb/COMPATIBILITY.md:
- Line 28: Update the Statement Timeout text to state explicitly that MariaDB’s
max_statement_time value is in seconds, distinguishing it from the
millisecond-based timeout_ms computation.
Review comments at @docs/connectors/mariadb/CONFIGURATION.md:
- Line 32: Update the query_timeout_seconds description to reflect the shared
connect behavior: it configures PyMySQL read_timeout and write_timeout and is
applied as a session statement. Remove the inaccurate claim that
asyncio.wait_for enforces individual query deadlines, since it applies only to
connection setup, and note that errors from the session statement are swallowed.
Review comments at @docs/connectors/mariadb/METADATA_INSPECTION.md:
- Line 32: Update the generated-column mapping text to match the exact EXTRA
strings handled by the connector in queries.py, including how those matches map
to generation_type. Verify the implementation’s matching logic rather than
implying that PERSISTENT itself maps to STORED.
Review comments at @docs/connectors/mariadb/SECURITY.md:
- Around line 40-41: Update the security-mode table in the MariaDB connector
documentation: clarify that `disable` uses plaintext and is not blocked in
production, and that `require` skips both certificate and hostname verification,
leaving connections vulnerable to man-in-the-middle attacks.
Review comments at @docs/connectors/mysql-family/PRIVILEGES.md:
- Around line 13-14: Update the privilege rationale in the SELECT row of the
privileges table to describe access to target-object catalog metadata without
claiming SELECT is inherently required for INFORMATION_SCHEMA visibility.
Replace the literal password in the CREATE USER example with a clear
generated-password placeholder.
Review comments at @docs/connectors/mysql/COMPATIBILITY.md:
- Line 11: Update the MySQL 5.7 entry in the compatibility table to state that
it is unsupported and untested, replacing the ambiguous “Restricted / Legacy”
status; leave the documented MySQL 8.0 and 8.4 support unchanged.
Review comments at @tests/connectors/mariadb/test_mariadb_adapter.py:
- Around line 166-172: Update the QUERY_CHECK_CONSTRAINTS_FALLBACK mock to
return check rows based on the requested table in args, or include a second
table with no checks; add an assertion that list_check_constraints returns an
empty list for that table.
Review comments at @tests/connectors/mysql/test_mysql_adapter.py:
- Around line 255-264: Update the mock branch for
QUERY_CHECK_CONSTRAINTS_FALLBACK to return the orders check regardless of the
requested table, while preserving the table-specific response for
QUERY_CHECK_CONSTRAINTS_MYSQL8. Add an assertion that
list_check_constraints("testdb", "users") returns an empty list, covering the
fallback path without leaking checks across tables.
Review comments at @tests/integration/mariadb/test_mariadb_live.py:
- Around line 59-87: Update test_read_only_session_enforcement_on_connection to
run the blocking pymysql.connect probe via asyncio.to_thread, call self.skipTest
when is_live is false, and keep the live-server enforcement assertion on the
live path; move the build_mysql_read_only_session_sql assertion into a separate
unit test.
Review comments at @tests/integration/mysql/test_mysql_live.py:
- Around line 59-92: Update test_read_only_session_enforcement_on_connection to
run the blocking pymysql.connect probe via asyncio.to_thread, call self.skipTest
when is_live is false, and keep server-enforcement assertions on the live path.
Move the build_mysql_read_only_session_sql string assertions into a unit test,
and apply the same nonblocking connection probe pattern to the corresponding
MariaDB live test.
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Summary
This pull request implements Phase 5.4: MySQL & MariaDB Database Connectors for DERA (Database Engineering & Reverse Analysis). It establishes production-grade, asynchronous database connector adapters for MySQL 8.0+ and MariaDB 10.5+ built on PyMySQL with asyncio thread-pooling, strict read-only session isolation,
INFORMATION_SCHEMAcatalog introspection, and capability reporting.Change Type
feat)fix)docs)refactor)perf)test)ci,build)security)!)Related Issues
Closes #40
Refers to Phase 5.4 Engineering Implementation Directive
Implementation Details
MySqlFamilyConnectionManagerinpackages/connectors/src/dera_connectors/mysql_family/connection.pymanaging PyMySQL lifecycles viaasyncio.to_thread.MySqlMetadataCatalogandMariaDbMetadataCatalogextracting schemas, tables, columns, constraints, foreign keys, indexes, views, and triggers.SET SESSION TRANSACTION READ ONLY;) and statement deadlines.169.254.169.254) and unauthorized private networks.docs/audit/PHASE_5_4_MYSQL_MARIADB_ACCEPTANCE.md).Testing
python scripts/development/dev.py allortest)Test evidence & notes:
tests/connectors/mysql/,tests/connectors/mariadb/, andtests/connectors/mysql_family/.npm run docs:lint) passed with 0 issues.python scripts/ci/validate_docs.py) passed.Documentation Impact
docs/updated or verified where requirednpm run docs:check)Security Impact & Deterministic Engineering
.envsecrets are committed.Security Assessment Note:
Breaking Changes
Contributor Checklist
mainbranch.feat(connectors): add SQLite metadata support).