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Simple HTTP client with HTTP/1.1, HTTP/2, and HTTP/3 support

Security advisory: This version has known vulnerabilities. View advisories
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hackney c_src lsquic src liblsquic lsquic_qpack_exp.h
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c_src/lsquic/src/liblsquic/lsquic_qpack_exp.h 

/* Copyright (c) 2017 - 2022 LiteSpeed Technologies Inc.  See LICENSE. */

/* QPACK Experiment record */



#ifndef LSQUIC_QPACK_EXP_H

#define LSQUIC_QPACK_EXP_H



struct qpack_exp_record

{

    enum {

        QER_SERVER       = 1 << 0,      /* Client or server */

        QER_ENCODER      = 1 << 1,      /* If not set, this is decoder */

    }               qer_flags;



    /* Timestamp of the first request */

    lsquic_time_t   qer_first_req;



    /* Timestamp of the last request */

    lsquic_time_t   qer_last_req;



    /* Number of header blocks passed through the encoder or the decoder */

    unsigned        qer_hblock_count;



    /* Cumulative size of all header blocks processed */

    unsigned        qer_hblock_size;



    /* For encoder, the "peer max size" is the maximum size advertised by

     * the peer and the "used max size" is the maximum size that our

     * encoder ends up using (the value selected by experiment).

     *

     * For decoder, the "used max size" is the maximum size we advertize

     * (selecte by experiment), while the "peer max size" is the size the

     * encoder uses as given by the value of the last TSU instruction.

     */

    unsigned        qer_peer_max_size;

    unsigned        qer_used_max_size;



    /* For encoder, the "peer max blocked" is the maximum number of blocked

     * streams advertised by the peer, while the "used max blocked" is the

     * self-imposed limit (selected by experiment).

     *

     * For decoder, the "used max blocked" is the maximum number of blocked

     * streams that we advertised (selected by experiment) and the "peer max

     * blocked" is the total number of times a header was blocked.  Note

     * that the latter does not count the duration of blockage and it may be

     * insignificant.  For example, a single packet may have header block

     * packaged before the required encoder stream update, in which case the

     * header block will be blocked and then unblocked immediately.

     */

    unsigned        qer_peer_max_blocked;

    unsigned        qer_used_max_blocked;



    /* The compression ratio is taken when experiment concludes via

     * lsqpack_enc_ratio() or lsqpack_dec_ratio().

     */

    float           qer_comp_ratio;



    /* Either 'Server:' or 'User-Agent:' */

    char           *qer_user_agent;

};



struct qpack_exp_record *

lsquic_qpack_exp_new (void);



void

lsquic_qpack_exp_destroy (struct qpack_exp_record *);



/* Returns same as snprintf(3) */

int

lsquic_qpack_exp_to_xml (const struct qpack_exp_record *, char *, size_t);



#endif