admissionprob.c
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Authored by • ema on Oct 25 2017, 10:18 AM.

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	F10426450: admissionprob.c
	Oct 25 2017, 10:18 AM

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	if (beresp.status == 200 && bereq.http.X-CDIS == "miss") {
	C{
	const struct gethdr_s prob_hdr = { HDR_BERESP, "\030X-Admission-Probability:" };
	const struct gethdr_s urand_hdr = { HDR_BERESP, "\022X-Admission-Urand:" };
	const struct gethdr_s hdr = { HDR_BERESP, "\017Content-Length:" };
	const char *clen_hdr = VRT_GetHdr(ctx, &hdr);
	const double urand = drand48();
	double admissionprob;
	// Set CL:0 by default
	int clen = 0;

	// If Content-Length has been specified
	if (clen_hdr)
	clen = atoi(clen_hdr);

	admissionprob = exp(-clen/adm_param);

	VRT_SetHdr(ctx, &prob_hdr, VRT_REAL_string(ctx, admissionprob), vrt_magic_string_end);
	VRT_SetHdr(ctx, &urand_hdr, VRT_REAL_string(ctx, urand), vrt_magic_string_end);

	// If admission test succeeds, mark as uncacheable (set ttl=0, do not
	// create hit-for-pass)
	if (admissionprob < urand) {
	VRT_l_beresp_ttl(ctx,0);
	VRT_l_beresp_uncacheable(ctx,1);
	}
	}C
	}

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