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https://github.com/open-policy-agent/opa.git
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Philip Conrad
ee9ab0bf75
This commit fixes a request handling bug introduced in #6868, which caused OPA to treat all incoming chunked requests as if they had zero-length request bodies. The fix detects cases where the request body size is unknown in the DecodingLimits handler, and propagates a request context key down to the `util.ReadMaybeCompressedBody` function, allowing it to correctly select between using the original `io.ReadAll` style for chunked requests, or the newer preallocated buffers approach (for requests of known size). This change has a small, but barely visible performance impact for large requests (<5% increase in GC pauses for a 1GB request JSON blob), and minimal, if any, effect on RPS under load. Fixes: #6904 Signed-off-by: Philip Conrad <philip@chariot-chaser.net>
32 lines
1.0 KiB
Go
32 lines
1.0 KiB
Go
package decoding
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import "context"
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type requestContextKey string
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// Note(philipc): We can add functions later to add the max request body length
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// to contexts, if we ever need to.
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const (
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reqCtxKeyMaxLen = requestContextKey("server-decoding-plugin-context-max-length")
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reqCtxKeyGzipMaxLen = requestContextKey("server-decoding-plugin-context-gzip-max-length")
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)
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func AddServerDecodingMaxLen(ctx context.Context, maxLen int64) context.Context {
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return context.WithValue(ctx, reqCtxKeyMaxLen, maxLen)
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}
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func AddServerDecodingGzipMaxLen(ctx context.Context, maxLen int64) context.Context {
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return context.WithValue(ctx, reqCtxKeyGzipMaxLen, maxLen)
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}
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// Used for enforcing max body content limits when dealing with chunked requests.
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func GetServerDecodingMaxLen(ctx context.Context) (int64, bool) {
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maxLength, ok := ctx.Value(reqCtxKeyMaxLen).(int64)
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return maxLength, ok
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}
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func GetServerDecodingGzipMaxLen(ctx context.Context) (int64, bool) {
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gzipMaxLength, ok := ctx.Value(reqCtxKeyGzipMaxLen).(int64)
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return gzipMaxLength, ok
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}
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