Struct vector::sources::util::grpc::DecompressionAndMetricsLayer

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pub struct DecompressionAndMetricsLayer;
Expand description

A layer for decompressing Tonic request payloads and emitting telemetry for the payload sizes.

In some cases, we configure tonic to use compression on requests to save CPU and throughput when sending those large requests. In the case of Vector-to-Vector communication, this means the Vector v2 source may deal with compressed requests. The code already transparently handles decompression, but as part of our component specification, we have specific goals around what event representations we pay attention to.

In the case of tracking bytes sent/received, we always want to track the number of bytes received after decompression to faithfully represent the amount of data being processed by Vector. This poses a problem with the out-of-the-box tonic codegen as there is no hook whatsoever to inspect the raw request payload (after decompression, if it was compressed at all) prior to the payload being decoded as a Protocol Buffers payload.

This layer wraps the incoming body in our own body type, which allows us to do two things: decompress the payload before it enters the decoding phase, and emit metrics based on the decompressed payload.

Since we can see the decompressed bytes, and also know if the underlying service responded successfully – i.e. the request was valid, and was processed – we can now report the number of bytes (after decompression) that were received and processed correctly.

The only supported compression scheme is gzip, which is also the only supported compression scheme in tonic itself.

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impl Clone for DecompressionAndMetricsLayer

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fn clone(&self) -> DecompressionAndMetricsLayer

Returns a copy of the value. Read more
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fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source. Read more
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impl Default for DecompressionAndMetricsLayer

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fn default() -> DecompressionAndMetricsLayer

Returns the “default value” for a type. Read more
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impl<S> Layer<S> for DecompressionAndMetricsLayer

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type Service = DecompressionAndMetrics<S>

The wrapped service
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fn layer(&self, inner: S) -> Self::Service

Wrap the given service with the middleware, returning a new service that has been decorated with the middleware.

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