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sdk/middleware/sqgin: response's content length monitoring #166
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Correctly handle the default response case.
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Julio-Guerra
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Nov 19, 2020
New Features: - **(#172) New SDK convenience function:** Add a new helper function `sdk.FromRequest()` allowing to retrieve Sqreen's request context and perform SDK calls. It is equivalent to `sdk.FromContext(r.Context())`. - **(#156) Performance monitoring:** Monitor the execution time of requests protected by Sqreen. Optionally, it is possible to enforce the maximum amount of time Sqreen is allowed to run per request: Sqreen's monitoring and protections will only run for the given amount of time. This option is disabled by default and should be used with caution as it can lead to partially protected requests. The resulting performance monitoring diagrams and setting are available at <https://my.sqreen.com/application/goto/settings/performance>. Note that the execution time diagram cannot be used as a strict Application Performance Monitoring diagram as it is based on a lossy representation. It gives rough estimates of the actual execution time. - **(#170) Transparent response writer instrumentation:** Make the HTTP response writer instrumentation transparent by providing the same set of interfaces as the instrumented HTTP response writer. The set of interfaces is currently every optional `net/http` response writer interface, along with some relevant `io` interfaces, among which: - `http.Flusher`: for HTTP streaming support (multipart, chunked...). - `http.Pusher`: for HTTP2 server push support. - `http.Hijacker`: for websocket server support (experimental). - `io.ReaderFrom`: for optimized copies (eg. file copies) - `io.WriteString`: for optimized string copies. - **(#163) HTTP status code 404 (not found) monitoring:** Automatically log a security event when the response status code is 404. This event is used by an internal Sqreen backend playbook to detect security scans. - **(#163) Scalable security event throughput:** To be able to handle a higher throughput of security events, the agent can now scale its number of goroutines. An extra goroutine is created every time the internal event queue is full, up to the number of available CPUs. Note that the agent still drops security events when the event queue is full in order to avoid slowing down the host application. - **(#165) Agent errors in the request hot-path:** To avoid slowing down request handlers, agent errors happening in the request hot path are now logged based on an exponential backoff algorithm. This is disabled when the agent log level is `debug`. Breaking Change: - **(#168) SDK return values:** The SDK function and method return values are no longer pointer values but Go interface values. This may break integrations using explicit SDK return types, and we recommend to instead use type-inference when possible. This change will allow us to transparently change the actual return values without involving any further breaking change. As of today, the actual return value is a structure small enough to be returned by value in order to save memory-allocation and garbage-collection time. Returning an interface value allows to hide such implementation detail. Fixes: - **(#167) Playbook security response events:** Fix playbook security response events (blocking or redirecting a user or ip) so that Sqreen's dashboard can properly display them and link them to their source playbook. - **(#169) SQL-injection protection with Elastic APM:** Fix the detection of the SQL dialect when the SQL driver is instrumented by Elastic's APM tracer. This requires Elastic's Go agent version greater than `v1.9.0`. - **(#164) Echo middleware:** Fix the response status code monitoring when Echo's request handlers return an error. - **(#166) Gin middleware:** Fix the response content-length monitoring of default responses (ie. when the handler does nothing).
Julio-Guerra
added a commit
that referenced
this pull request
Nov 19, 2020
New Features: - **(#172) New SDK convenience function:** Add a new helper function `sdk.FromRequest()` allowing to retrieve Sqreen's request context and perform SDK calls. It is equivalent to `sdk.FromContext(r.Context())`. - **(#156) Performance monitoring:** Monitor the execution time of requests protected by Sqreen. Optionally, it is possible to enforce the maximum amount of time Sqreen is allowed to run per request: Sqreen's monitoring and protections will only run for the given amount of time. This option is disabled by default and should be used with caution as it can lead to partially protected requests. The resulting performance monitoring diagrams and setting are available at <https://my.sqreen.com/application/goto/settings/performance>. Note that the execution time diagram cannot be used as a strict Application Performance Monitoring diagram as it is based on a lossy representation. It gives rough estimates of the actual execution time. - **(#170) Transparent response writer instrumentation:** Make the HTTP response writer instrumentation transparent by providing the same set of interfaces as the instrumented HTTP response writer. The set of interfaces is currently every optional `net/http` response writer interface, along with some relevant `io` interfaces, among which: - `http.Flusher`: for HTTP streaming support (multipart, chunked...). - `http.Pusher`: for HTTP2 server push support. - `http.Hijacker`: for websocket server support (experimental). - `io.ReaderFrom`: for optimized copies (eg. file copies) - `io.WriteString`: for optimized string copies. - **(#163) HTTP status code 404 (not found) monitoring:** Automatically log a security event when the response status code is 404. This event is used by an internal Sqreen backend playbook to detect security scans. - **(#163) Scalable security event throughput:** To be able to handle a higher throughput of security events, the agent can now scale its number of goroutines. An extra goroutine is created every time the internal event queue is full, up to the number of available CPUs. Note that the agent still drops security events when the event queue is full in order to avoid slowing down the host application. - **(#165) Agent errors in the request hot-path:** To avoid slowing down request handlers, agent errors happening in the request hot path are now logged based on an exponential backoff algorithm. This is disabled when the agent log level is `debug`. Breaking Change: - **(#168) SDK return values:** The SDK function and method return values are no longer pointer values but Go interface values. This may break integrations using explicit SDK return types, and we recommend to instead use type-inference when possible. This change will allow us to transparently change the actual return values without involving any further breaking change. As of today, the actual return value is a structure small enough to be returned by value in order to save memory-allocation and garbage-collection time. Returning an interface value allows to hide such implementation detail. Fixes: - **(#167) Playbook security response events:** Fix playbook security response events (blocking or redirecting a user or ip) so that Sqreen's dashboard can properly display them and link them to their source playbook. - **(#169) SQL-injection protection with Elastic APM:** Fix the detection of the SQL dialect when the SQL driver is instrumented by Elastic's APM tracer. This requires Elastic's Go agent version greater than `v1.9.0`. - **(#164) Echo middleware:** Fix the response status code monitoring when Echo's request handlers return an error. - **(#166) Gin middleware:** Fix the response content-length monitoring of default responses (ie. when the handler does nothing).
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Fix the response's content-length monitoring with the default response (ie. the handler does nothing).