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GITHUB_PR_NUMBER: 6244 GITHUB_PR_URL: https://github.com/hasura/graphql-engine/pull/6244 Co-authored-by: José Lorenzo Rodríguez <37621+lorenzo@users.noreply.github.com> GitOrigin-RevId: fef22d98ac7be23ca21a63dc1c696fa7169253a4
413 lines
13 KiB
ReStructuredText
413 lines
13 KiB
ReStructuredText
.. meta::
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:description: Hasura GraphQL engine server logs
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:keywords: hasura, docs, deployment, logs, server logs
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.. _hge_logs:
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Hasura GraphQL engine logs
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==========================
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.. contents:: Table of contents
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:backlinks: none
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:depth: 1
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:local:
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Accessing logs
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--------------
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Based on your deployment method, the Hasura GraphQL engine logs can be accessed as follows:
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- :ref:`On Heroku <heroku_logs>`
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- :ref:`On Docker <docker_logs>`
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- :ref:`On Kubernetes <kubernetes_logs>`
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- :ref:`On Digital Ocean <do_logs>`
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- :ref:`On Azure <azure_logs>`
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- :ref:`On Google Cloud & Kubernetes <gc_kubernetes_logs>`
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.. _log-types:
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Different log-types
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-------------------
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The Hasura GraphQL engine has different kind of log-types depending on the sub-system or the layer. A log-type is simply the ``type`` field in a log line, which indicates which sub-system the log comes from.
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For example, the HTTP webserver logs incoming requests as an access log and is called ``http-log``. Similarly logs from the websocket layer are called ``websocket-log``, logs from the event trigger system are called ``event-trigger`` etc.
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You can configure the GraphQL engine to enable/disable certain log-types using the the ``--enabled-log-types`` flag or the ``HASURA_GRAPHQL_ENABLED_LOG_TYPES`` env var. See :ref:`server_flag_reference`
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Default enabled log-types are: ``startup, http-log, webhook-log, websocket-log``
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All the log-types that can be enabled/disabled are:
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.. list-table:: Configurable log-types
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:header-rows: 1
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:widths: 10 25 10
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* - Log type
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- Description
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- Log Level
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* - ``startup``
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- Information that is logged during startup
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- ``info``
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* - ``query-log``
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- Logs: the entire GraphQL query with variables, generated SQL statements
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(only for queries, not for mutations/subscriptions or remote schema
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queries), the operation name (if provided in the GraphQL request)
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- ``info``
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* - ``http-log``
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- Http access and error logs at the webserver layer (handling GraphQL and metadata requests)
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- ``info`` and ``error``
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* - ``websocket-log``
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- Websocket events and error logs at the websocket server layer (handling GraphQL requests)
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- ``info`` and ``error``
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* - ``webhook-log``
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- Logs responses and errors from the authorization webhook (if setup)
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- ``info`` and ``error``
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Apart from the above, there are other internal log-types which cannot be configured:
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.. list-table:: Internal log-types
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:header-rows: 1
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:widths: 10 25 10
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* - Log type
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- Description
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- Log Level
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* - ``pg-client``
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- Logs from the postgres client library
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- ``warn``
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* - ``metadata``
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- Logs inconsistent metadata items
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- ``warn``
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* - ``jwk-refresh-log``
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- Logs information and errors about periodic refreshing of JWK
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- ``info`` and ``error``
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* - ``telemetry-log``
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- Logs error (if any) while sending out telemetry data
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- ``info``
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* - ``event-trigger``
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- Logs HTTP responses from the webhook, HTTP exceptions and internal
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errors
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- ``info`` and ``error``
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* - ``ws-server``
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- Debug logs from the websocket server, mostly used internally for debugging
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- ``debug``
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* - ``schema-sync-thread``
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- Logs internal events, when it detects schema has changed on Postgres and
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when it reloads the schema
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- ``info`` and ``error``
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Logging levels
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--------------
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You can set the desired logging level on the server using the ``log-level`` flag or the ``HASURA_GRAPHQL_LOG_LEVEL`` env var. See :ref:`server_flag_reference`.
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The default log-level is ``info``.
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Setting a log-level will print all logs of priority greater than the set level. The log-level hierarchy is: ``debug > info > warn > error``
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For example, setting ``--log-level=warn``, will enable all warn and error level logs only. So even if you have enabled ``query-log`` it won't be printed as the level of ``query-log`` is ``info``.
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See :ref:`log-types <log-types>` for more details on log-level of each log-type.
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Log structure and metrics
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-------------------------
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All requests are identified by a request id. If the client sends a ``x-request-id`` header then that is used, otherwise a request id is generated for each request. This is also sent back to the client as a response header (``x-request-id``). This is useful to correlate logs from the server and the client.
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**query-log** structure
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^^^^^^^^^^^^^^^^^^^^^^^
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On enabling verbose logging, i.e. enabling ``query-log``,
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GraphQL engine will log the full GraphQL query object on each request.
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It will also log the generated SQL for GraphQL queries (but not mutations and
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subscriptions).
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.. code-block:: json
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{
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"timestamp": "2019-06-03T13:25:10.915+0530",
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"level": "info",
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"type": "query-log",
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"detail": {
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"request_id": "840f952d-c489-4d21-a87a-cc23ad17926a",
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"query": {
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"variables": {
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"limit": 10
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},
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"operationName": "getProfile",
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"query": "query getProfile($limit: Int!) {\n profile(limit: $limit, where: {username: {_like: \"%a%\"}}) {\n username\n }\n myusername: profile (where: {username: {_eq: \"foobar\"}}) {\n username\n }\n}\n"
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},
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"generated_sql": {
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"profile": {
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"prepared_arguments": ["{\"x-hasura-role\":\"admin\"}", "%a%"],
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"query": "SELECT coalesce(json_agg(\"root\" ), '[]' ) AS \"root\" FROM (SELECT row_to_json((SELECT \"_1_e\" FROM (SELECT \"_0_root.base\".\"username\" AS \"username\" ) AS \"_1_e\" ) ) AS \"root\" FROM (SELECT * FROM \"public\".\"profile\" WHERE ((\"public\".\"profile\".\"username\") LIKE ($2)) ) AS \"_0_root.base\" LIMIT 10 ) AS \"_2_root\" "
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},
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"myusername": {
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"prepared_arguments": ["{\"x-hasura-role\":\"admin\"}", "foobar"],
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"query": "SELECT coalesce(json_agg(\"root\" ), '[]' ) AS \"root\" FROM (SELECT row_to_json((SELECT \"_1_e\" FROM (SELECT \"_0_root.base\".\"username\" AS \"username\" ) AS \"_1_e\" ) ) AS \"root\" FROM (SELECT * FROM \"public\".\"profile\" WHERE ((\"public\".\"profile\".\"username\") = ($2)) ) AS \"_0_root.base\" ) AS \"_2_root\" "
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}
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}
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}
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}
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The ``type`` of in the log with be ``query-log``. All the details are nested
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under the ``detail`` key.
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This log contains 3 important fields:
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- ``request_id``: A unique ID for each request. If the client sends a
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``x-request-id`` header then that is respected, otherwise a UUID is generated
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for each request. This is useful to correlate between ``http-log`` and
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``query-log``.
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- ``query``: Contains the full GraphQL request including the variables and
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operation name.
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- ``generated_sql``: this contains the generated SQL for GraphQL queries. For
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mutations and subscriptions this field will be ``null``.
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**http-log** structure
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^^^^^^^^^^^^^^^^^^^^^^
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This is how the HTTP access logs look like:
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- On success response:
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.. code-block:: json
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{
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"timestamp": "2019-05-30T23:40:24.654+0530",
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"level": "info",
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"type": "http-log",
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"detail": {
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"request_id": "072b3617-6653-4fd5-b5ee-580e9d098c3d",
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"operation": {
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"query_execution_time": 0.009240042,
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"user_vars": {
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"x-hasura-role": "user"
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},
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"error": null,
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"request_id": "072b3617-6653-4fd5-b5ee-580e9d098c3d",
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"response_size": 105,
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"query": null
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},
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"http_info": {
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"status": 200,
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"http_version": "HTTP/1.1",
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"url": "/v1/graphql",
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"ip": "127.0.0.1",
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"method": "POST"
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}
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}
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}
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- On error response:
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.. code-block:: json
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{
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"timestamp": "2019-05-29T15:22:37.834+0530",
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"level": "error",
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"type": "http-log",
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"detail": {
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"operation": {
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"query_execution_time": 0.000656144,
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"user_vars": {
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"x-hasura-role": "user",
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"x-hasura-user-id": "1"
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},
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"error": {
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"path": "$.selectionSet.profile.selectionSet.usernamex",
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"error": "field \"usernamex\" not found in type: 'profile'",
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"code": "validation-failed"
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},
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"request_id": "072b3617-6653-4fd5-b5ee-580e9d098c3d",
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"response_size": 142,
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"query": {
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"variables": {
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"limit": 10
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},
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"operationName": "getProfile",
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"query": "query getProfile($limit: Int!) { profile(limit: $limit, where:{username: {_like: \"%a%\"}}) { usernamex} }"
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}
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},
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"http_info": {
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"status": 200,
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"http_version": "HTTP/1.1",
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"url": "/v1/graphql",
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"ip": "127.0.0.1",
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"method": "POST"
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}
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}
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The ``type`` in the log will be ``http-log`` for HTTP access/error log. This
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log contains basic information about the HTTP request and the GraphQL operation.
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It has two important "keys" under the ``detail`` section - ``operation`` and ``http_info``.
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``http_info`` lists various information regarding the HTTP request, e.g. IP
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address, URL path, HTTP status code etc.
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``operation`` lists various information regarding the GraphQL query/operation.
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- ``query_execution_time``: the time taken to parse the GraphQL query (from JSON
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request), compile it to SQL with permissions and user session variables, and
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then executing it and fetching the results back from Postgres. The unit is in
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seconds.
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- ``user_vars``: contains the user session variables. Or the ``x-hasura-*``
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session variables inferred from the authorization mode.
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- ``request_id``: A unique ID for each request. If the client sends a
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``x-request-id`` header then that is respected, otherwise a UUID is generated
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for each request.
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- ``response_size``: Size of the response in bytes.
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- ``error``: *optional*. Will contain the error object when there is an error,
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otherwise this will be ``null``. This key can be used to detect if there is an
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error in the request. The status code for error requests will be ``200`` on
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the ``v1/graphql`` endpoint.
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- ``query``: *optional*. This will contain the GraphQL query object only when
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there is an error. On successful response this will be ``null``.
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**websocket-log** structure
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^^^^^^^^^^^^^^^^^^^^^^^^^^^
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This is how the Websocket logs look like:
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- On successful operation start:
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.. code-block:: json
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{
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"timestamp": "2019-06-10T10:52:54.247+0530",
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"level": "info",
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"type": "websocket-log",
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"detail": {
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"event": {
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"type": "operation",
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"detail": {
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"request_id": "d2ede87d-5cb7-44b6-8736-1d898117722a",
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"operation_id": "1",
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"query": {
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"variables": {},
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"query": "subscription {\n author {\n name\n }\n}\n"
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},
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"operation_type": {
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"type": "started"
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},
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"operation_name": null
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}
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},
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"connection_info": {
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"websocket_id": "f590dd18-75db-4602-8693-8150239df7f7",
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"jwt_expiry": null,
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"msg": null
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},
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"user_vars": {
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"x-hasura-role": "admin"
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}
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}
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}
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- On operation stop:
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.. code-block:: json
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{
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"timestamp": "2019-06-10T11:01:40.939+0530",
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"level": "info",
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"type": "websocket-log",
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"detail": {
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"event": {
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"type": "operation",
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"detail": {
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"request_id": null,
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"operation_id": "1",
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"query": null,
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"operation_type": {
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"type": "stopped"
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},
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"operation_name": null
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}
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},
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"connection_info": {
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"websocket_id": "7f782190-fd58-4305-a83f-8e17177b204e",
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"jwt_expiry": null,
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"msg": null
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},
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"user_vars": {
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"x-hasura-role": "admin"
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}
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}
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}
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- On error:
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.. code-block:: json
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{
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"timestamp": "2019-06-10T10:55:20.650+0530",
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"level": "error",
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"type": "websocket-log",
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"detail": {
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"event": {
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"type": "operation",
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"detail": {
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"request_id": "150e3e6a-e1a7-46ba-a9d4-da6b192a4005",
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"operation_id": "1",
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"query": {
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"variables": {},
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"query": "subscription {\n author {\n namex\n }\n}\n"
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},
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"operation_type": {
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"type": "query_err",
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"detail": {
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"path": "$.selectionSet.author.selectionSet.namex",
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"error": "field \"namex\" not found in type: 'author'",
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"code": "validation-failed"
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}
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},
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"operation_name": null
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}
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},
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"connection_info": {
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"websocket_id": "49932ddf-e54d-42c6-bffb-8a57a1c6dcbe",
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"jwt_expiry": null,
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"msg": null
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},
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"user_vars": {
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"x-hasura-role": "admin"
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}
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}
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}
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Monitoring frameworks
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---------------------
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You can integrate the logs emitted by Hasura GraphQL with external monitoring tools for better visibility as per
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your convenience.
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For some examples, see :ref:`guides_monitoring_frameworks`.
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