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{ | ||
"ignorePatterns": [ | ||
{ | ||
"pattern": "^/source/server-discovery-and-monitoring/server-discovery-and-monitoring.rst#" | ||
} | ||
] | ||
} |
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# Connection Monitoring and Pooling (CMAP) | ||
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______________________________________________________________________ | ||
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## Introduction | ||
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Drivers MUST implement all of the following types of CMAP tests: | ||
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- Pool unit and integration tests as described in [cmap-format/README](./cmap-format/README.md) | ||
- Pool prose tests as described below in [Prose Tests](#prose-tests) | ||
- Logging tests as described below in [Logging Tests](#logging-tests) | ||
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## Prose Tests | ||
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The following tests have not yet been automated, but MUST still be tested: | ||
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1. All ConnectionPoolOptions MUST be specified at the MongoClient level | ||
1. All ConnectionPoolOptions MUST be the same for all pools created by a MongoClient | ||
1. A user MUST be able to specify all ConnectionPoolOptions via a URI string | ||
1. A user MUST be able to subscribe to Connection Monitoring Events in a manner idiomatic to their language and driver | ||
1. When a check out attempt fails because connection set up throws an error, assert that a ConnectionCheckOutFailedEvent | ||
with reason="connectionError" is emitted. | ||
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## Logging Tests | ||
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Tests for connection pool logging can be found in the [/logging](./logging) subdirectory and are written in the | ||
[Unified Test Format](../../unified-test-format/unified-test-format.rst). |
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# Connection Monitoring and Pooling (CMAP) Unit and Integration Tests | ||
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______________________________________________________________________ | ||
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## Introduction | ||
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The YAML and JSON files in this directory are platform-independent tests that drivers can use to prove their conformance | ||
to the Connection Monitoring and Pooling (CMAP) Spec. | ||
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## Common Test Format | ||
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Each YAML file has the following keys: | ||
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- `version`: A version number indicating the expected format of the spec tests (current version = 1) | ||
- `style`: A string indicating what style of tests this file contains. Contains one of the following: | ||
- `"unit"`: a test that may be run without connecting to a MongoDB deployment. | ||
- `"integration"`: a test that MUST be run against a real MongoDB deployment. | ||
- `description`: A text description of what the test is meant to assert | ||
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## Unit Test Format: | ||
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All Unit Tests have some of the following fields: | ||
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- `poolOptions`: If present, connection pool options to use when creating a pool; both | ||
[standard ConnectionPoolOptions](https://github.com/mongodb/specifications/blob/master/source/connection-monitoring-and-pooling/connection-monitoring-and-pooling.rst#connection-pool-options-1) | ||
and the following test-specific options are allowed: | ||
- `backgroundThreadIntervalMS`: A time interval between the end of a | ||
[Background Thread Run](https://github.com/mongodb/specifications/blob/master/source/connection-monitoring-and-pooling/connection-monitoring-and-pooling.rst#background-thread) | ||
and the beginning of the next Run. If a Connection Pool does not implement a Background Thread, the Test Runner MUST | ||
ignore the option. If the option is not specified, an implementation is free to use any value it finds reasonable. | ||
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Possible values (0 is not allowed): | ||
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- A negative value: never begin a Run. | ||
- A positive value: the interval between Runs in milliseconds. | ||
- `operations`: A list of operations to perform. All operations support the following fields: | ||
- `name`: A string describing which operation to issue. | ||
- `thread`: The name of the thread in which to run this operation. If not specified, runs in the default thread | ||
- `error`: Indicates that the main thread is expected to error during this test. An error may include of the following | ||
fields: | ||
- `type`: the type of error emitted | ||
- `message`: the message associated with that error | ||
- `address`: Address of pool emitting error | ||
- `events`: An array of all connection monitoring events expected to occur while running `operations`. An event may | ||
contain any of the following fields | ||
- `type`: The type of event emitted | ||
- `address`: The address of the pool emitting the event | ||
- `connectionId`: The id of a connection associated with the event | ||
- `options`: Options used to create the pool | ||
- `reason`: A reason giving more information on why the event was emitted | ||
- `ignore`: An array of event names to ignore | ||
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Valid Unit Test Operations are the following: | ||
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- `start(target)`: Starts a new thread named `target` | ||
- `target`: The name of the new thread to start | ||
- `wait(ms)`: Sleep the current thread for `ms` milliseconds | ||
- `ms`: The number of milliseconds to sleep the current thread for | ||
- `waitForThread(target)`: wait for thread `target` to finish executing. Propagate any errors to the main thread. | ||
- `target`: The name of the thread to wait for. | ||
- `waitForEvent(event, count, timeout)`: block the current thread until `event` has occurred `count` times | ||
- `event`: The name of the event | ||
- `count`: The number of times the event must occur (counting from the start of the test) | ||
- `timeout`: If specified, time out with an error after waiting for this many milliseconds without seeing the required | ||
events | ||
- `label = pool.checkOut()`: call `checkOut` on pool, returning the checked out connection | ||
- `label`: If specified, associate this label with the returned connection, so that it may be referenced in later | ||
operations | ||
- `pool.checkIn(connection)`: call `checkIn` on pool | ||
- `connection`: A string label identifying which connection to check in. Should be a label that was previously set | ||
with `checkOut` | ||
- `pool.clear()`: call `clear` on Pool | ||
- `interruptInUseConnections`: Determines whether "in use" connections should be also interrupted | ||
- `pool.close()`: call `close` on Pool | ||
- `pool.ready()`: call `ready` on Pool | ||
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## Integration Test Format | ||
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The integration test format is identical to the unit test format with the addition of the following fields to each test: | ||
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- `runOn` (optional): An array of server version and/or topology requirements for which the tests can be run. If the | ||
test environment satisfies one or more of these requirements, the tests may be executed; otherwise, this test should | ||
be skipped. If this field is omitted, the tests can be assumed to have no particular requirements and should be | ||
executed. Each element will have some or all of the following fields: | ||
- `minServerVersion` (optional): The minimum server version (inclusive) required to successfully run the tests. If | ||
this field is omitted, it should be assumed that there is no lower bound on the required server version. | ||
- `maxServerVersion` (optional): The maximum server version (inclusive) against which the tests can be run | ||
successfully. If this field is omitted, it should be assumed that there is no upper bound on the required server | ||
version. | ||
- `failPoint`: optional, a document containing a `configureFailPoint` command to run against the endpoint being used for | ||
the test. | ||
- `poolOptions.appName` (optional): appName attribute to be set in connections, which will be affected by the fail | ||
point. | ||
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## Spec Test Match Function | ||
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The definition of MATCH or MATCHES in the Spec Test Runner is as follows: | ||
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- MATCH takes two values, `expected` and `actual` | ||
- Notation is "Assert `actual` MATCHES `expected`" | ||
- Assertion passes if `expected` is a subset of `actual`, with the values `42` and `"42"` acting as placeholders for | ||
"any value" | ||
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Pseudocode implementation of `actual` MATCHES `expected`: | ||
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``` | ||
If expected is "42" or 42: | ||
Assert that actual exists (is not null or undefined) | ||
Else: | ||
Assert that actual is of the same JSON type as expected | ||
If expected is a JSON array: | ||
For every idx/value in expected: | ||
Assert that actual[idx] MATCHES value | ||
Else if expected is a JSON object: | ||
For every key/value in expected | ||
Assert that actual[key] MATCHES value | ||
Else: | ||
Assert that expected equals actual | ||
``` | ||
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## Unit Test Runner: | ||
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For the unit tests, the behavior of a Connection is irrelevant beyond the need to asserting `connection.id`. Drivers MAY | ||
use a mock connection class for testing the pool behavior in unit tests | ||
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For each YAML file with `style: unit`: | ||
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- Create a Pool `pool`, subscribe and capture any Connection Monitoring events emitted in order. | ||
- If `poolOptions` is specified, use those options to initialize both pools | ||
- The returned pool must have an `address` set as a string value. | ||
- Process each `operation` in `operations` (on the main thread) | ||
- If a `thread` is specified, the main thread MUST schedule the operation to execute in the corresponding thread. | ||
Otherwise, execute the operation directly in the main thread. | ||
- If `error` is presented | ||
- Assert that an actual error `actualError` was thrown by the main thread | ||
- Assert that `actualError` MATCHES `error` | ||
- Else: | ||
- Assert that no errors were thrown by the main thread | ||
- calculate `actualEvents` as every Connection Event emitted whose `type` is not in `ignore` | ||
- if `events` is not empty, then for every `idx`/`expectedEvent` in `events` | ||
- Assert that `actualEvents[idx]` exists | ||
- Assert that `actualEvents[idx]` MATCHES `expectedEvent` | ||
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It is important to note that the `ignore` list is used for calculating `actualEvents`, but is NOT used for the | ||
`waitForEvent` command | ||
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## Integration Test Runner | ||
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The steps to run the integration tests are the same as those used to run the unit tests with the following | ||
modifications: | ||
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- The integration tests MUST be run against an actual endpoint. If the deployment being tested contains multiple | ||
endpoints, then the runner MUST only use one of them to run the tests against. | ||
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- For each test, if `failPoint` is specified, its value is a `configureFailPoint` command. Run the command on the admin | ||
database of the endpoint being tested to enable the fail point. | ||
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- At the end of each test, any enabled fail point MUST be disabled to avoid spurious failures in subsequent tests. The | ||
fail point may be disabled like so: | ||
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```javascript | ||
db.adminCommand({ | ||
configureFailPoint: "<fail point name>", | ||
mode: "off" | ||
}); | ||
``` |
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