/*-

 * Copyright (c) 2006 Verdens Gang AS

 * Copyright (c) 2006-2015 Varnish Software AS

 * All rights reserved.

 *

 * Author: Poul-Henning Kamp <phk@phk.freebsd.dk>

 *

 * SPDX-License-Identifier: BSD-2-Clause

 *

 * Redistribution and use in source and binary forms, with or without

 * modification, are permitted provided that the following conditions

 * are met:

 * 1. Redistributions of source code must retain the above copyright

 *    notice, this list of conditions and the following disclaimer.

 * 2. Redistributions in binary form must reproduce the above copyright

 *    notice, this list of conditions and the following disclaimer in the

 *    documentation and/or other materials provided with the distribution.

 *

 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND

 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE

 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE

 * ARE DISCLAIMED.  IN NO EVENT SHALL AUTHOR OR CONTRIBUTORS BE LIABLE

 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL

 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS

 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)

 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT

 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY

 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF

 * SUCH DAMAGE.

 *

 */

#ifdef VRT_H_INCLUDED

#  error "vrt.h included before cache.h - they are exclusive"

#endif

#ifdef CACHE_H_INCLUDED

#  error "cache.h included multiple times"

#endif

#include <math.h>

#include <pthread.h>

#include <stdarg.h>

#include <sys/types.h>

#include "vdef.h"

#include "vrt.h"

#define CACHE_H_INCLUDED        // After vrt.h include.

#include "miniobj.h"

#include "vas.h"

#include "vqueue.h"

#include "vtree.h"

#include "vapi/vsl_int.h"

/*--------------------------------------------------------------------*/

struct vxids {

        uint64_t        vxid;

};

typedef struct vxids vxid_t;

#define NO_VXID ((struct vxids){0})

#define IS_NO_VXID(x) ((x).vxid == 0)

#define VXID_TAG(x) ((uintmax_t)((x).vxid & (VSL_CLIENTMARKER|VSL_BACKENDMARKER)))

#define VXID(u) ((uintmax_t)((u.vxid) & VSL_IDENTMASK))

#define IS_SAME_VXID(x, y) ((x).vxid == (y).vxid)

/*--------------------------------------------------------------------*/

struct body_status {

        const char              *name;

        int                     nbr;

        int                     avail;

        int                     length_known;

};

#define BODYSTATUS(U, l, n, a, k) extern const struct body_status BS_##U[1];

#include "tbl/body_status.h"

typedef const struct body_status *body_status_t;

typedef const char *hdr_t;

/*--------------------------------------------------------------------*/

struct stream_close {

        unsigned                magic;

#define STREAM_CLOSE_MAGIC      0xc879c93d

        int                     idx;

        unsigned                is_err;

        const char              *name;

        const char              *desc;

};

    extern const struct stream_close SC_NULL[1];

#define SESS_CLOSE(nm, stat, err, desc) \

    extern const struct stream_close SC_##nm[1];

#include "tbl/sess_close.h"

/*--------------------------------------------------------------------

 * Indices into http->hd[]

 */

enum {

#define SLTH(tag, ind, req, resp, sdesc, ldesc) ind,

#include "tbl/vsl_tags_http.h"

};

/*--------------------------------------------------------------------*/

struct ban;

struct ban_proto;

struct cli;

struct http_conn;

struct listen_sock;

struct mempool;

struct objcore;

struct objhead;

struct pool;

struct req_step;

struct sess;

struct transport;

struct vcf;

struct VSC_lck;

struct VSC_main;

struct VSC_main_wrk;

struct worker;

struct worker_priv;

#define DIGEST_LEN              32

/*--------------------------------------------------------------------*/

struct lock { void *priv; };    // Opaque

/*--------------------------------------------------------------------

 * Workspace structure for quick memory allocation.

 */

#define WS_ID_SIZE 4

struct ws {

        unsigned                magic;

#define WS_MAGIC                0x35fac554

        char                    id[WS_ID_SIZE]; /* identity */

        char                    *s;             /* (S)tart of buffer */

        char                    *f;             /* (F)ree/front pointer */

        char                    *r;             /* (R)eserved length */

        char                    *e;             /* (E)nd of buffer */

};

/*--------------------------------------------------------------------

 *

 */

struct http {

        unsigned                magic;

#define HTTP_MAGIC              0x6428b5c9

        uint16_t                shd;            /* Size of hd space */

        txt                     *hd;

        unsigned char           *hdf;

#define HDF_FILTER              (1 << 0)        /* Filtered by Connection */

        /* NB: ->nhd and below zeroed/initialized by http_Teardown */

        uint16_t                nhd;            /* Next free hd */

        enum VSL_tag_e          logtag;         /* Must be SLT_*Method */

        struct vsl_log          *vsl;

        struct ws               *ws;

        uint16_t                status;

        uint8_t                 protover;

};

/*--------------------------------------------------------------------*/

struct acct_req {

#define ACCT(foo)       uint64_t        foo;

#include "tbl/acct_fields_req.h"

};

/*--------------------------------------------------------------------*/

struct acct_bereq {

#define ACCT(foo)       uint64_t        foo;

#include "tbl/acct_fields_bereq.h"

};

/*--------------------------------------------------------------------*/

struct vsl_log {

        uint32_t                *wlb, *wlp, *wle;

        unsigned                wlr;

        vxid_t                  wid;

};

/*--------------------------------------------------------------------*/

VRBT_HEAD(vrt_privs, vrt_priv);

/* Worker pool stuff -------------------------------------------------*/

typedef void task_func_t(struct worker *wrk, void *priv);

struct pool_task {

        VTAILQ_ENTRY(pool_task)         list;

        task_func_t                     *func;

        void                            *priv;

};

/*

 * tasks are taken off the queues in this order

 *

 * TASK_QUEUE_{REQ|STR} are new req's (H1/H2), and subject to queue limit.

 *

 * TASK_QUEUE_RUSH is req's returning from waiting list

 *

 * NOTE: When changing the number of classes, update places marked with

 * TASK_QUEUE_RESERVE in params.h

 */

enum task_prio {

        TASK_QUEUE_BO,

        TASK_QUEUE_RUSH,

        TASK_QUEUE_REQ,

        TASK_QUEUE_STR,

        TASK_QUEUE_VCA,

        TASK_QUEUE_BG,

        TASK_QUEUE__END

};

#define TASK_QUEUE_HIGHEST_PRIORITY TASK_QUEUE_BO

#define TASK_QUEUE_RESERVE TASK_QUEUE_BG

#define TASK_QUEUE_LIMITED(prio) \

        (prio == TASK_QUEUE_REQ || prio == TASK_QUEUE_STR)

/*--------------------------------------------------------------------*/

struct worker {

        unsigned                magic;

#define WORKER_MAGIC            0x6391adcf

        int                     strangelove;

        struct worker_priv      *wpriv;

        struct pool             *pool;

        struct VSC_main_wrk     *stats;

        struct vsl_log          *vsl;           // borrowed from req/bo

        struct pool_task        task[1];

        vtim_real               lastused;

        pthread_cond_t          cond;

        struct ws               aws[1];

        unsigned                cur_method;

        unsigned                seen_methods;

        struct wrk_vpi          *vpi;

};

/* Stored object -----------------------------------------------------

 * This is just to encapsulate the fields owned by the stevedore

 */

struct storeobj {

        const struct stevedore  *stevedore;

        void                    *priv;

        uint64_t                priv2;

};

/* Busy Objcore structure --------------------------------------------

 *

 */

/*

 * The macro-states we expose outside the fetch code

 */

enum boc_state_e {

#define BOC_STATE(U, l)       BOS_##U,

#include "tbl/boc_state.h"

};

struct boc {

        unsigned                magic;

#define BOC_MAGIC               0x70c98476

        unsigned                refcount;

        struct lock             mtx;

        pthread_cond_t          cond;

        void                    *stevedore_priv;

        enum boc_state_e        state;

        uint8_t                 *vary;

        uint64_t                fetched_so_far;

        uint64_t                delivered_so_far;

        uint64_t                transit_buffer;

};

/* Object core structure ---------------------------------------------

 * Objects have sideways references in the binary heap and the LRU list

 * and we want to avoid paging in a lot of objects just to move them up

 * or down the binheap or to move a unrelated object on the LRU list.

 * To avoid this we use a proxy object, objcore, to hold the relevant

 * housekeeping fields parts of an object.

 */

enum obj_attr {

#define OBJ_FIXATTR(U, l, s)    OA_##U,

#define OBJ_VARATTR(U, l)       OA_##U,

#define OBJ_AUXATTR(U, l)       OA_##U,

#include "tbl/obj_attr.h"

                                OA__MAX,

};

enum obj_flags {

#define OBJ_FLAG(U, l, v)       OF_##U = v,

#include "tbl/obj_attr.h"

};

enum oc_flags {

#define OC_FLAG(U, l, v)        OC_F_##U = v,

#include "tbl/oc_flags.h"

};

#define OC_F_TRANSIENT (OC_F_PRIVATE | OC_F_HFM | OC_F_HFP)

enum oc_exp_flags {

#define OC_EXP_FLAG(U, l, v)    OC_EF_##U = v,

#include "tbl/oc_exp_flags.h"

};

struct objcore {

        unsigned                magic;

#define OBJCORE_MAGIC           0x4d301302

        int                     refcnt;

        struct storeobj         stobj[1];

        struct objhead          *objhead;

        struct boc              *boc;

        vtim_real               timer_when;

        VCL_INT                 hits;

        vtim_real               t_origin;

        float                   ttl;

        float                   grace;

        float                   keep;

        uint8_t                 flags;

        uint8_t                 exp_flags;

        uint16_t                oa_present;

        unsigned                timer_idx;      // XXX 4Gobj limit

        vtim_real               last_lru;

        VTAILQ_ENTRY(objcore)   hsh_list;

        VTAILQ_ENTRY(objcore)   lru_list;

        VTAILQ_ENTRY(objcore)   ban_list;

        VSTAILQ_ENTRY(objcore)  exp_list;

        struct ban              *ban;

};

/* Busy Object structure ---------------------------------------------

 *

 * The busyobj structure captures the aspects of an object related to,

 * and while it is being fetched from the backend.

 *

 * One of these aspects will be how much has been fetched, which

 * streaming delivery will make use of.

 */

enum director_state_e {

        DIR_S_NULL = 0,

        DIR_S_HDRS = 1,

        DIR_S_BODY = 2,

};

struct busyobj {

        unsigned                magic;

#define BUSYOBJ_MAGIC           0x23b95567

        char                    *end;

        /*

         * All fields from retries and down are zeroed when the busyobj

         * is recycled.

         */

        unsigned                retries;

        struct req              *req;

        struct sess             *sp;

        struct worker           *wrk;

        /* beresp.body */

        struct vfp_ctx          *vfc;

        const char              *vfp_filter_list;

        /* bereq.body */

        const char              *vdp_filter_list;

        struct ws               ws[1];

        uintptr_t               ws_bo;

        struct http             *bereq0;

        struct http             *bereq;

        struct http             *beresp;

        struct objcore          *bereq_body;

        struct objcore          *stale_oc;

        struct objcore          *fetch_objcore;

        const char              *no_retry;

        struct http_conn        *htc;

        struct pool_task        fetch_task[1];

#define BERESP_FLAG(l, r, w, f, d) unsigned     l:1;

#define BEREQ_FLAG(l, r, w, d) BERESP_FLAG(l, r, w, 0, d)

#include "tbl/bereq_flags.h"

#include "tbl/beresp_flags.h"

        /* Timeouts */

        vtim_dur                connect_timeout;

        vtim_dur                first_byte_timeout;

        vtim_dur                between_bytes_timeout;

        vtim_dur                task_deadline;

        /* Timers */

        vtim_real               t_first;        /* First timestamp logged */

        vtim_real               t_resp;         /* response received */

        vtim_real               t_prev;         /* Previous timestamp logged */

        /* Acct */

        struct acct_bereq       acct;

        const struct stevedore  *storage;

        const struct director   *director_req;

        const struct director   *director_resp;

        enum director_state_e   director_state;

        struct vcl              *vcl;

        struct vsl_log          vsl[1];

        uint8_t                 digest[DIGEST_LEN];

        struct vrt_privs        privs[1];

        uint16_t                err_code;

        const char              *err_reason;

        const char              *client_identity;

};

#define BUSYOBJ_TMO(bo, pfx, tmo)                                       \

        (isnan((bo)->tmo) ? cache_param->pfx##tmo : (bo)->tmo)

/*--------------------------------------------------------------------*/

struct reqtop {

        unsigned                magic;

#define REQTOP_MAGIC            0x57fbda52

        struct req              *topreq;

        struct vcl              *vcl0;

        struct vrt_privs        privs[1];

};

struct req {

        unsigned                magic;

#define REQ_MAGIC               0xfb4abf6d

        body_status_t           req_body_status;

        stream_close_t          doclose;

        unsigned                restarts;

        unsigned                esi_level;

        /* Delivery mode */

        unsigned                res_mode;

#define RES_ESI                 (1<<4)

#define RES_PIPE                (1<<7)

        const struct req_step   *req_step;

        struct reqtop           *top;   /* esi_level == 0 request */

#define REQ_FLAG(l, r, w, d) unsigned   l:1;

#include "tbl/req_flags.h"

        uint16_t                err_code;

        const char              *err_reason;

        struct sess             *sp;

        struct worker           *wrk;

        struct pool_task        task[1];

        const struct transport  *transport;

        void                    *transport_priv;

        VTAILQ_ENTRY(req)       w_list;

        struct objcore          *body_oc;

        /* The busy objhead we sleep on */

        struct objhead          *hash_objhead;

        /* Built Vary string == workspace reservation */

        uint8_t                 *vary_b;

        uint8_t                 *vary_e;

        uint8_t                 digest[DIGEST_LEN];

        vtim_dur                d_ttl;

        vtim_dur                d_grace;

        const struct stevedore  *storage;

        const struct director   *director_hint;

        struct vcl              *vcl;

        uintptr_t               ws_req;         /* WS above request data */

        /* Timestamps */

        vtim_real               t_first;        /* First timestamp logged */

        vtim_real               t_prev;         /* Previous timestamp logged */

        vtim_real               t_req;          /* Headers complete */

        vtim_real               t_resp;         /* Entry to last deliver/synth */

        struct http_conn        *htc;

        struct vfp_ctx          *vfc;

        const char              *client_identity;

        /* HTTP request */

        struct http             *http;

        struct http             *http0;

        /* HTTP response */

        struct http             *resp;

        intmax_t                resp_len;

        struct ws               ws[1];

        struct objcore          *objcore;

        struct objcore          *stale_oc;

        struct boc              *boc;           /* valid during cnt_transmit */

        /* resp.body */

        struct vdp_ctx          *vdc;

        const char              *vdp_filter_list;

        /* req.body */

        const char              *vfp_filter_list;

        /* Transaction VSL buffer */

        struct vsl_log          vsl[1];

        /* Temporary accounting */

        struct acct_req         acct;

        struct vrt_privs        privs[1];

        struct vcf              *vcf;

};

#define IS_TOPREQ(req) ((req)->top->topreq == (req))

/*--------------------------------------------------------------------

 * Struct sess is a high memory-load structure because sessions typically

 * hang around the waiter for relatively long time.

 *

 * The size goal for struct sess + struct memitem is <512 bytes

 *

 * Getting down to the next relevant size (<256 bytes because of how malloc

 * works, is not realistic without a lot of code changes.

 */

enum sess_attr {

#define SESS_ATTR(UP, low, typ, len)    SA_##UP,

#include "tbl/sess_attr.h"

        SA_LAST

};

struct sess {

        unsigned                magic;

#define SESS_MAGIC              0x2c2f9c5a

        uint16_t                sattr[SA_LAST];

        struct listen_sock      *listen_sock;

        int                     refcnt;

        int                     fd;

        vxid_t                  vxid;

        struct lock             mtx;

        struct pool             *pool;

        struct ws               ws[1];

        vtim_real               t_open;         /* fd accepted */

        vtim_real               t_idle;         /* fd accepted or resp sent */

        vtim_dur                timeout_idle;

        vtim_dur                timeout_linger;

        vtim_dur                send_timeout;

        vtim_dur                idle_send_timeout;

};

#define SESS_TMO(sp, tmo)                                       \

        (isnan((sp)->tmo) ? cache_param->tmo : (sp)->tmo)

/* Prototypes etc ----------------------------------------------------*/

/* cache_ban.c */

/* for constructing bans */

struct ban_proto *BAN_Build(void);

const char *BAN_AddTest(struct ban_proto *,

    const char *, const char *, const char *);

const char *BAN_Commit(struct ban_proto *b);

void BAN_Abandon(struct ban_proto *b);

/* cache_cli.c [CLI] */

extern pthread_t cli_thread;

#define IS_CLI() (pthread_equal(pthread_self(), cli_thread))

#define ASSERT_CLI() do {assert(IS_CLI());} while (0)

/* cache_http.c */

unsigned HTTP_estimate(unsigned nhttp);

void HTTP_Clone(struct http *to, const struct http * const fm);

void HTTP_Dup(struct http *to, const struct http * const fm);

struct http *HTTP_create(void *p, uint16_t nhttp, unsigned);

const char *http_Status2Reason(unsigned, const char **);

int http_IsHdr(const txt *hh, hdr_t hdr);

unsigned http_EstimateWS(const struct http *fm, unsigned how);

void http_PutResponse(struct http *to, const char *proto, uint16_t status,

    const char *response);

void http_FilterReq(struct http *to, const struct http *fm, unsigned how);

void HTTP_Encode(const struct http *fm, uint8_t *, unsigned len, unsigned how);

int HTTP_Decode(struct http *to, const uint8_t *fm);

void http_ForceHeader(struct http *to, hdr_t, const char *val);

void http_AppendHeader(struct http *to, hdr_t, const char *val);

void http_PrintfHeader(struct http *to, const char *fmt, ...)

    v_printflike_(2, 3);

void http_TimeHeader(struct http *to, const char *fmt, vtim_real now);

const char * http_ViaHeader(void);

void http_Proto(struct http *to);

void http_SetHeader(struct http *to, const char *header);

void http_SetH(struct http *to, unsigned n, const char *header);

void http_ForceField(struct http *to, unsigned n, const char *t);

void HTTP_Setup(struct http *, struct ws *, struct vsl_log *, enum VSL_tag_e);

void http_Teardown(struct http *ht);

int http_GetHdr(const struct http *hp, hdr_t, const char **ptr);

int http_GetHdrToken(const struct http *hp, hdr_t,

    const char *token, const char **pb, const char **pe);

int http_GetHdrField(const struct http *hp, hdr_t,

    const char *field, const char **ptr);

double http_GetHdrQ(const struct http *hp, hdr_t, const char *field);

ssize_t http_GetContentLength(const struct http *hp);

ssize_t http_GetContentRange(const struct http *hp, ssize_t *lo, ssize_t *hi);

const char * http_GetRange(const struct http *hp, ssize_t *lo, ssize_t *hi,

    ssize_t len);

uint16_t http_GetStatus(const struct http *hp);

int http_IsStatus(const struct http *hp, int);

void http_SetStatus(struct http *to, uint16_t status, const char *reason);

const char *http_GetMethod(const struct http *hp);

int http_HdrIs(const struct http *hp, hdr_t, const char *val);

void http_CopyHome(const struct http *hp);

void http_Unset(struct http *hp, hdr_t);

unsigned http_CountHdr(const struct http *hp, hdr_t);

void http_CollectHdr(struct http *hp, hdr_t);

void http_CollectHdrSep(struct http *hp, hdr_t, const char *sep);

void http_VSL_log(const struct http *hp);

void HTTP_Merge(struct worker *, struct objcore *, struct http *to);

uint16_t HTTP_GetStatusPack(struct worker *, struct objcore *oc);

int HTTP_IterHdrPack(struct worker *, struct objcore *, const char **);

#define HTTP_FOREACH_PACK(wrk, oc, ptr) \

         for ((ptr) = NULL; HTTP_IterHdrPack(wrk, oc, &(ptr));)

const char *HTTP_GetHdrPack(struct worker *, struct objcore *, hdr_t);

stream_close_t http_DoConnection(struct http *hp, stream_close_t sc_close);

int http_IsFiltered(const struct http *hp, unsigned u, unsigned how);

#define HTTPH_R_PASS            (1 << 0)        /* Request (c->b) in pass mode */

#define HTTPH_R_FETCH           (1 << 1)        /* Request (c->b) for fetch */

#define HTTPH_A_INS             (1 << 2)        /* Response (b->o) for insert */

#define HTTPH_A_PASS            (1 << 3)        /* Response (b->o) for pass */

#define HTTPH_C_SPECIFIC        (1 << 4)        /* Connection-specific */

#define HTTPH(a, b, c) extern char b[];

#include "tbl/http_headers.h"

extern const char H__Status[];

extern const char H__Proto[];

extern const char H__Reason[];

// rfc7233,l,1207,1208

#define http_tok_eq(s1, s2)             (!vct_casecmp(s1, s2))

#define http_tok_at(s1, s2, l)          (!vct_caselencmp(s1, s2, l))

#define http_ctok_at(s, cs)             (!vct_caselencmp(s, cs, sizeof(cs) - 1))

// rfc7230,l,1037,1038

#define http_scheme_at(str, tok)        http_ctok_at(str, #tok "://")

// rfc7230,l,1144,1144

// rfc7231,l,1156,1158

#define http_method_eq(str, tok)        (!strcmp(str, #tok))

// rfc7230,l,1222,1222

// rfc7230,l,2848,2848

// rfc7231,l,3883,3885

// rfc7234,l,1339,1340

// rfc7234,l,1418,1419

#define http_hdr_eq(s1, s2)             http_tok_eq(s1, s2)

#define http_hdr_at(s1, s2, l)          http_tok_at(s1, s2, l)

// rfc7230,l,1952,1952

// rfc7231,l,604,604

#define http_coding_eq(str, tok)        http_tok_eq(str, #tok)

// rfc7231,l,1864,1864

#define http_expect_eq(str, tok)        http_tok_eq(str, #tok)

// rfc7233,l,1207,1208

#define http_range_at(str, tok, l)      http_tok_at(str, #tok, l)

/* cache_lck.c */

/* Internal functions, call only through macros below */

void Lck__Lock(struct lock *lck, const char *p,  int l);

void Lck__Unlock(struct lock *lck, const char *p,  int l);

int Lck__Trylock(struct lock *lck, const char *p,  int l);

void Lck__New(struct lock *lck, struct VSC_lck *, const char *);

int Lck__Held(const struct lock *lck);

int Lck__Owned(const struct lock *lck);

extern pthread_mutexattr_t mtxattr_errorcheck;

/* public interface: */

void Lck_Delete(struct lock *lck);

int Lck_CondWaitUntil(pthread_cond_t *, struct lock *, vtim_real when);

int Lck_CondWait(pthread_cond_t *, struct lock *);

int Lck_CondWaitTimeout(pthread_cond_t *, struct lock *, vtim_dur timeout);

#define Lck_New(a, b) Lck__New(a, b, #b)

#define Lck_Lock(a) Lck__Lock(a, __func__, __LINE__)

#define Lck_Unlock(a) Lck__Unlock(a, __func__, __LINE__)

#define Lck_Trylock(a) Lck__Trylock(a, __func__, __LINE__)

#define Lck_AssertHeld(a)               \

        do {                            \

                assert(Lck__Held(a));   \

                assert(Lck__Owned(a));  \

        } while (0)

struct VSC_lck *Lck_CreateClass(struct vsc_seg **, const char *);

void Lck_DestroyClass(struct vsc_seg **);

#define LOCK(nam) extern struct VSC_lck *lck_##nam;

#include "tbl/locks.h"

/* cache_obj.c */

int ObjHasAttr(struct worker *, struct objcore *, enum obj_attr);

const void *ObjGetAttr(struct worker *, struct objcore *, enum obj_attr,

    ssize_t *len);

typedef int objiterate_f(void *priv, unsigned flush,

    const void *ptr, ssize_t len);

#define OBJ_ITER_FLUSH  0x01

#define OBJ_ITER_END    0x02

int ObjIterate(struct worker *, struct objcore *,

    void *priv, objiterate_f *func, int final);

vxid_t ObjGetXID(struct worker *, struct objcore *);

uint64_t ObjGetLen(struct worker *, struct objcore *);

int ObjGetDouble(struct worker *, struct objcore *, enum obj_attr, double *);

int ObjGetU64(struct worker *, struct objcore *, enum obj_attr, uint64_t *);

int ObjCheckFlag(struct worker *, struct objcore *, enum obj_flags of);

/* cache_req_body.c */

ssize_t VRB_Iterate(struct worker *, struct vsl_log *, struct req *,

    objiterate_f *func, void *priv);

/* cache_session.c [SES] */

#define SESS_ATTR(UP, low, typ, len)                                    \

        int SES_Get_##low(const struct sess *sp, typ **dst);

#include "tbl/sess_attr.h"

const char *SES_Get_String_Attr(const struct sess *sp, enum sess_attr a);

/* cache_shmlog.c */

void VSLv(enum VSL_tag_e tag, vxid_t vxid, const char *fmt, va_list va);

void VSL(enum VSL_tag_e tag, vxid_t vxid, const char *fmt, ...)

    v_printflike_(3, 4);

void VSLs(enum VSL_tag_e tag, vxid_t vxid, const struct strands *s);

void VSLbv(struct vsl_log *, enum VSL_tag_e tag, const char *fmt, va_list va);

void VSLb(struct vsl_log *, enum VSL_tag_e tag, const char *fmt, ...)

    v_printflike_(3, 4);

void VSLbt(struct vsl_log *, enum VSL_tag_e tag, txt t);

void VSLbs(struct vsl_log *, enum VSL_tag_e tag, const struct strands *s);

void VSLb_ts(struct vsl_log *, const char *event, vtim_real first,

    vtim_real *pprev, vtim_real now);

void VSLb_bin(struct vsl_log *, enum VSL_tag_e, ssize_t, const void*);

int VSL_tag_is_masked(enum VSL_tag_e tag);

static inline void

{

static inline void

{

/* cache_vcl.c */

const char *VCL_Name(const struct vcl *);

/* cache_wrk.c */

typedef void *bgthread_t(struct worker *, void *priv);

void WRK_BgThread(pthread_t *thr, const char *name, bgthread_t *func,

    void *priv);

/* cache_ws.c */

void WS_Init(struct ws *ws, const char *id, void *space, unsigned len);

unsigned WS_ReserveSize(struct ws *, unsigned);

unsigned WS_ReserveAll(struct ws *);

void WS_Release(struct ws *ws, unsigned bytes);

void WS_ReleaseP(struct ws *ws, const char *ptr);

void WS_Assert(const struct ws *ws);

void WS_Reset(struct ws *ws, uintptr_t);

void *WS_Alloc(struct ws *ws, unsigned bytes);

void *WS_Copy(struct ws *ws, const void *str, int len);

uintptr_t WS_Snapshot(struct ws *ws);

int WS_Allocated(const struct ws *ws, const void *ptr, ssize_t len);

unsigned WS_Dump(const struct ws *ws, char, size_t off, void *buf, size_t len);

static inline void *

{

}

static inline unsigned

{

}

static inline unsigned

{

}

/* cache_ws_common.c */

void WS_MarkOverflow(struct ws *ws);

int WS_Overflowed(const struct ws *ws);

const char *WS_Printf(struct ws *ws, const char *fmt, ...) v_printflike_(2, 3);

void WS_VSB_new(struct vsb *, struct ws *);

char *WS_VSB_finish(struct vsb *, struct ws *, size_t *);

/* WS utility */

#define WS_TASK_ALLOC_OBJ(ctx, ptr, magic) do {                 \

        ptr = WS_Alloc((ctx)->ws, sizeof *(ptr));               \

        if ((ptr) == NULL)                                      \

                VRT_fail(ctx, "Out of workspace for " #magic);  \

        else                                                    \

                INIT_OBJ(ptr, magic);                           \

} while(0)

/* cache_rfc2616.c */

void RFC2616_Ttl(struct busyobj *, vtim_real now, vtim_real *t_origin,

    float *ttl, float *grace, float *keep);

unsigned RFC2616_Req_Gzip(const struct http *);

int RFC2616_Do_Cond(const struct req *sp);

void RFC2616_Weaken_Etag(struct http *hp);

void RFC2616_Vary_AE(struct http *hp);

const char * RFC2616_Strong_LM(const struct http *hp, struct worker *wrk,

    struct objcore *oc);

/*

 * We want to cache the most recent timestamp in wrk->lastused to avoid

 * extra timestamps in cache_pool.c.  Hide this detail with a macro

 */

#define W_TIM_real(w) ((w)->lastused = VTIM_real())