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Http2HeadersSink Class — netty Architecture

Architecture documentation for the Http2HeadersSink class in HpackDecoder.java from the netty codebase.

Class java

Entity Profile

Dependency Diagram

graph TD
  09e943af_04b7_39e7_f2dd_47f3684d790f["Http2HeadersSink"]
  0349111a_08cf_8a81_958c_9daf941c0bac["HpackDecoder.java"]
  09e943af_04b7_39e7_f2dd_47f3684d790f -->|defined in| 0349111a_08cf_8a81_958c_9daf941c0bac
  1274ec90_f9d7_b6b8_bfb2_b9981266b7f0["Http2HeadersSink()"]
  09e943af_04b7_39e7_f2dd_47f3684d790f -->|method| 1274ec90_f9d7_b6b8_bfb2_b9981266b7f0
  3d97e02b_938f_df8f_b607_d74819f6fa66["finish()"]
  09e943af_04b7_39e7_f2dd_47f3684d790f -->|method| 3d97e02b_938f_df8f_b607_d74819f6fa66
  43fd3d2d_f851_d2d8_22e4_2146ae2443f8["appendToHeaderList()"]
  09e943af_04b7_39e7_f2dd_47f3684d790f -->|method| 43fd3d2d_f851_d2d8_22e4_2146ae2443f8

Relationship Graph

Source Code

codec-http2/src/main/java/io/netty/handler/codec/http2/HpackDecoder.java lines 524–570

    private static final class Http2HeadersSink {
        private final Http2Headers headers;
        private final long maxHeaderListSize;
        private final int streamId;
        private final boolean validateHeaders;
        private long headersLength;
        private boolean exceededMaxLength;
        private HeaderType previousType;
        private Http2Exception validationException;

        Http2HeadersSink(int streamId, Http2Headers headers, long maxHeaderListSize, boolean validateHeaders) {
            this.headers = headers;
            this.maxHeaderListSize = maxHeaderListSize;
            this.streamId = streamId;
            this.validateHeaders = validateHeaders;
        }

        void finish() throws Http2Exception {
            if (exceededMaxLength) {
                headerListSizeExceeded(streamId, maxHeaderListSize, true);
            } else if (validationException != null) {
                throw validationException;
            }
        }

        void appendToHeaderList(AsciiString name, AsciiString value) {
            headersLength += HpackHeaderField.sizeOf(name, value);
            exceededMaxLength |= headersLength > maxHeaderListSize;

            if (exceededMaxLength || validationException != null) {
                // We don't store the header since we've already failed validation requirements.
                return;
            }

            try {
                headers.add(name, value);
                if (validateHeaders) {
                    previousType = validateHeader(streamId, name, value, previousType);
                }
            } catch (IllegalArgumentException ex) {
                validationException = streamError(streamId, PROTOCOL_ERROR, ex,
                        "Validation failed for header '%s': %s", name, ex.getMessage());
            } catch (Http2Exception ex) {
                validationException = streamError(streamId, PROTOCOL_ERROR, ex, ex.getMessage());
            }
        }
    }

Defined In

Source

Frequently Asked Questions

What is the Http2HeadersSink class?
Http2HeadersSink is a class in the netty codebase, defined in codec-http2/src/main/java/io/netty/handler/codec/http2/HpackDecoder.java.
Where is Http2HeadersSink defined?
Http2HeadersSink is defined in codec-http2/src/main/java/io/netty/handler/codec/http2/HpackDecoder.java at line 524.

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