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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Hydra · Request Lifecycle (Terminate Mode)</title>
<style>
/* =====================================================================
Hydra — Request Lifecycle (Terminate-in-Pingora mode)
Single self-contained file. No external deps.
Palette anchored on the hydra admin-ui tokens; richer stage accents
layered for the flow diagram. Respects prefers-reduced-motion.
===================================================================== */
:root {
/* foundations (harmonized with admin-ui) */
--bg: #0b0e14;
--bg-1: #0f1115;
--panel: #161a23;
--panel-2: #1c212d;
--panel-3: #232938;
--border: #2a2f3a;
--border-2: #363d4d;
--text: #e6e9ef;
--text-2: #aab2c2;
--muted: #8a93a3;
--faint: #5b6473;
/* semantic */
--ok: #3fb950;
--warn: #d29922;
--err: #f85149;
/* stage accents */
--ingress: #4c8dff; /* blue — entry */
--filter: #a78bfa; /* violet — gating */
--failover: #f0b429; /* amber — failover for-loop / provider call */
--response: #34d399; /* green — success stream-back */
--logging: #2dd4bf; /* teal — usage / metrics */
--error: #fb7185; /* rose — off-ramp */
--grad: linear-gradient(120deg, #4c8dff 0%, #a78bfa 50%, #2dd4bf 120%);
--shadow: 0 18px 50px -22px rgba(0,0,0,.75);
--shadow-sm: 0 6px 20px -10px rgba(0,0,0,.6);
--mono: "SFMono-Regular", "JetBrains Mono", "Fira Code", ui-monospace,
"Cascadia Code", Menlo, Consolas, "Liberation Mono", monospace;
--sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica,
Arial, "Apple Color Emoji", sans-serif;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
margin: 0;
font-family: var(--sans);
color: var(--text);
background: var(--bg);
line-height: 1.55;
-webkit-font-smoothing: antialiased;
text-rendering: optimizeLegibility;
overflow-x: hidden;
}
/* ---- atmospheric background layers ---- */
.bg-layers { position: fixed; inset: 0; z-index: -1; pointer-events: none; overflow: hidden; }
.bg-layers::before {
content: ""; position: absolute; inset: 0;
background:
radial-gradient(900px 600px at 12% -8%, rgba(76,141,255,.14), transparent 60%),
radial-gradient(820px 620px at 92% 4%, rgba(167,139,250,.12), transparent 62%),
radial-gradient(900px 700px at 70% 108%, rgba(45,212,191,.10), transparent 60%),
var(--bg-1);
}
.bg-layers::after {
content: ""; position: absolute; inset: 0;
background-image:
linear-gradient(rgba(255,255,255,.022) 1px, transparent 1px),
linear-gradient(90deg, rgba(255,255,255,.022) 1px, transparent 1px);
background-size: 46px 46px;
mask-image: radial-gradient(circle at 50% 30%, #000 0%, transparent 80%);
}
/* ---- layout shell ---- */
.wrap { max-width: 1080px; margin: 0 auto; padding: 0 22px; }
/* ============================== HEADER ============================== */
header.site { padding: 64px 0 8px; }
.brand { display: flex; align-items: center; gap: 16px; flex-wrap: wrap; }
.mark {
width: 52px; height: 52px; border-radius: 14px; flex: none;
background: var(--grad);
display: grid; place-items: center;
box-shadow: 0 10px 30px -10px rgba(76,141,255,.6), inset 0 0 0 1px rgba(255,255,255,.18);
}
.mark svg { width: 28px; height: 28px; }
.brand h1 {
margin: 0; font-size: clamp(26px, 4vw, 38px); font-weight: 800;
letter-spacing: -.02em; line-height: 1;
}
.brand h1 .grad {
background: var(--grad); -webkit-background-clip: text; background-clip: text; color: transparent;
}
.brand .tag {
font-family: var(--mono); font-size: 11px; color: #d9bdfd;
border: 1px solid rgba(167,139,250,.45);
background: rgba(167,139,250,.1);
padding: 3px 9px; border-radius: 999px; margin-left: 4px; vertical-align: middle;
font-weight: 600;
}
.subtitle {
color: var(--text-2); font-size: clamp(15px, 2vw, 18px);
max-width: 64ch; margin: 18px 0 0;
}
.subtitle b { color: var(--text); font-weight: 600; }
.subtitle .hot { color: #ffd98a; }
/* legend */
.legend {
margin-top: 30px; display: flex; flex-wrap: wrap; gap: 8px 14px; align-items: center;
}
.legend .lbl {
font-family: var(--mono); font-size: 11px; color: var(--faint);
text-transform: uppercase; letter-spacing: .12em; margin-right: 4px;
}
.chip {
display: inline-flex; align-items: center; gap: 8px;
font-size: 12.5px; color: var(--text-2);
border: 1px solid var(--border); background: var(--panel);
padding: 5px 11px; border-radius: 999px;
}
.chip i {
width: 9px; height: 9px; border-radius: 50%; display: inline-block;
box-shadow: 0 0 0 3px rgba(255,255,255,.04);
}
.chip i.c-ingress { background: var(--ingress); }
.chip i.c-filter { background: var(--filter); }
.chip i.c-failover { background: var(--failover); }
.chip i.c-response { background: var(--response); }
.chip i.c-logging { background: var(--logging); }
.chip i.c-error { background: var(--error); }
/* ============================== FLOW ============================== */
section.flow { padding: 40px 0 16px; }
.flow-stage-label {
display: flex; align-items: center; gap: 12px;
font-family: var(--mono); font-size: 11px; color: var(--faint);
text-transform: uppercase; letter-spacing: .18em;
margin: 30px 0 14px;
}
.flow-stage-label::after {
content: ""; flex: 1; height: 1px;
background: linear-gradient(90deg, var(--border), transparent);
}
.flow {
display: flex; flex-direction: column; align-items: center;
max-width: 880px; margin: 0 auto;
}
/* ---- node card ---- */
.node {
width: 100%; max-width: 560px;
background: linear-gradient(180deg, rgba(255,255,255,.035), rgba(255,255,255,0) 80%), var(--panel);
border: 1px solid var(--border);
border-radius: 16px;
padding: 16px 18px 16px 20px;
position: relative;
box-shadow: var(--shadow-sm);
transition: transform .22s ease, border-color .22s ease, box-shadow .22s ease;
}
.node:hover {
transform: translateY(-2px); border-color: var(--border-2); box-shadow: var(--shadow);
}
.node::before {
content: ""; position: absolute; left: 0; top: 14px; bottom: 14px;
width: 3px; border-radius: 0 3px 3px 0;
background: var(--accent-c, var(--ingress));
box-shadow: 0 0 14px -2px var(--accent-c, var(--ingress));
}
.node.s-ingress { --accent-c: var(--ingress); }
.node.s-filter { --accent-c: var(--filter); }
.node.s-failover { --accent-c: var(--failover); }
.node.s-response { --accent-c: var(--response); }
.node.s-logging { --accent-c: var(--logging); }
.node .head { display: flex; align-items: center; gap: 10px; margin-bottom: 6px; flex-wrap: wrap; }
.node .stage-tag {
font-family: var(--mono); font-size: 10.5px; letter-spacing: .14em;
text-transform: uppercase; color: var(--accent-c);
border: 1px solid color-mix(in srgb, var(--accent-c) 40%, transparent);
background: color-mix(in srgb, var(--accent-c) 12%, transparent);
padding: 2px 8px; border-radius: 6px; font-weight: 600;
}
.node .title { font-family: var(--mono); font-size: 15px; font-weight: 700; color: var(--text); letter-spacing: -.01em; }
.node .title.fn { color: color-mix(in srgb, var(--accent-c) 70%, var(--text)); }
.node .desc { color: var(--text-2); font-size: 13.5px; margin: 2px 0 0; }
.node .desc b { color: var(--text); font-weight: 600; }
code {
font-family: var(--mono); font-size: 12px;
background: rgba(255,255,255,.05); border: 1px solid var(--border);
padding: 1px 5px; border-radius: 5px; color: var(--text);
}
/* payload chips under ingress */
.payload { display: flex; flex-wrap: wrap; gap: 7px; margin-top: 11px; }
.payload .k {
font-family: var(--mono); font-size: 11.5px; color: var(--text-2);
background: rgba(76,141,255,.08); border: 1px solid rgba(76,141,255,.28);
padding: 3px 9px; border-radius: 7px;
}
.payload .k b { color: #cfe0ff; font-weight: 600; }
/* ---- connectors along the happy path ---- */
.conn {
width: 2px; height: 30px; position: relative; flex: none;
background: repeating-linear-gradient(to bottom, color-mix(in srgb, var(--cc, var(--ingress)) 85%, white) 0 7px, transparent 7px 14px);
background-size: 100% 14px;
animation: dash-down .7s linear infinite;
filter: drop-shadow(0 0 4px color-mix(in srgb, var(--cc, var(--ingress)) 45%, transparent));
}
.conn::after {
content: ""; position: absolute; bottom: -2px; left: 50%; transform: translateX(-50%);
width: 0; height: 0; border: 5px solid transparent;
border-top: 7px solid color-mix(in srgb, var(--cc, var(--ingress)) 85%, white);
}
.conn.violet { --cc: var(--filter); }
.conn.amber { --cc: var(--failover); }
.conn.green { --cc: var(--response); }
.conn.teal { --cc: var(--logging); }
@keyframes dash-down { to { background-position: 0 14px; } }
/* small label sitting on a connector */
.conn-label {
font-family: var(--mono); font-size: 10.5px; color: var(--muted);
padding: 2px 8px; background: var(--bg-1); border: 1px solid var(--border);
border-radius: 999px; position: absolute; left: 12px; top: 50%; transform: translateY(-50%);
white-space: nowrap;
}
/* ============================== grouped phases ============================== */
.group {
width: 100%; max-width: 780px;
border: 1px dashed var(--gc, color-mix(in srgb, var(--filter) 42%, transparent));
border-radius: 20px;
padding: 14px;
background:
radial-gradient(120% 80% at 50% 0%, var(--gtint, rgba(167,139,250,.07)), transparent 60%),
var(--gtint-bg, rgba(167,139,250,.025));
position: relative;
box-shadow: var(--shadow-sm);
}
.group.g-filter { --gc: color-mix(in srgb, var(--filter) 42%, transparent); --gtint: rgba(167,139,250,.07); --gtint-bg: rgba(167,139,250,.025); }
.group.g-failover { --gc: color-mix(in srgb, var(--failover) 45%, transparent); --gtint: rgba(240,180,41,.07); --gtint-bg: rgba(240,180,41,.03); }
.group.g-logging { --gc: color-mix(in srgb, var(--logging) 42%, transparent); --gtint: rgba(45,212,191,.07); --gtint-bg: rgba(45,212,191,.025); }
.group-head { display: flex; align-items: center; gap: 10px; margin: 2px 4px 12px; flex-wrap: wrap; }
.group-head .badge {
font-family: var(--mono); font-size: 11px; font-weight: 700;
letter-spacing: .12em; text-transform: uppercase;
padding: 4px 10px; border-radius: 7px;
}
.group.g-filter .group-head .badge { color: #ede6ff; background: linear-gradient(135deg, rgba(167,139,250,.28), rgba(76,141,255,.2)); border: 1px solid rgba(167,139,250,.45); }
.group.g-failover .group-head .badge { color: #ffe9b0; background: linear-gradient(135deg, rgba(240,180,41,.3), rgba(248,113,113,.15)); border: 1px solid rgba(240,180,41,.45); }
.group.g-logging .group-head .badge { color: #c7f6ec; background: linear-gradient(135deg, rgba(45,212,191,.28), rgba(52,211,153,.18)); border: 1px solid rgba(45,212,191,.45); }
.group-head .gtitle { font-size: 13.5px; color: var(--text-2); }
.group-head .gtitle b { color: var(--text); }
.steps { display: flex; flex-direction: column; gap: 9px; }
.step {
display: grid; grid-template-columns: 28px 1fr; gap: 12px; align-items: start;
background: var(--panel); border: 1px solid var(--border); border-radius: 12px;
padding: 11px 13px;
transition: border-color .2s ease, transform .2s ease, background .2s ease;
}
.step:hover { border-color: var(--border-2); background: var(--panel-2); }
.step .num {
width: 26px; height: 26px; border-radius: 8px; flex: none;
display: grid; place-items: center;
font-family: var(--mono); font-size: 13px; font-weight: 700; color: #fff;
box-shadow: 0 4px 12px -4px var(--nc, rgba(167,139,250,.7));
background: linear-gradient(140deg, var(--nc-a, var(--filter)), var(--nc-b, color-mix(in srgb, var(--filter) 50%, #4c8dff)));
}
.g-failover .step .num { --nc: rgba(240,180,41,.7); --nc-a: var(--failover); --nc-b: color-mix(in srgb, var(--failover) 55%, #f87171); }
.g-logging .step .num { --nc: rgba(45,212,191,.7); --nc-a: var(--logging); --nc-b: color-mix(in srgb, var(--logging) 55%, var(--response)); }
.step .body { min-width: 0; }
.step .stitle { font-family: var(--mono); font-size: 13px; font-weight: 700; color: #efeaff; display: flex; align-items: center; gap: 8px; flex-wrap: wrap; }
.g-failover .step .stitle { color: #fff3d6; }
.g-logging .step .stitle { color: #d7f7f0; }
.step .stitle .fn { color: var(--nc, var(--filter)); }
.step .sdesc { color: var(--text-2); font-size: 12.5px; margin-top: 2px; }
.step .sdesc b { color: var(--text); font-weight: 600; }
.step .keychange {
display: inline-block; font-family: var(--mono); font-size: 10px; font-weight: 700;
letter-spacing: .08em; text-transform: uppercase; color: #ffe1a3;
background: rgba(240,180,41,.14); border: 1px solid rgba(240,180,41,.4);
padding: 1px 6px; border-radius: 5px; margin-left: 6px;
}
/* error off-ramp inline chips inside a step */
.err-ramp { display: inline-flex; align-items: center; gap: 6px; flex-wrap: wrap; margin-top: 7px; }
.err-ramp .arrow { font-family: var(--mono); color: var(--error); opacity: .9; font-size: 12px; }
.code {
font-family: var(--mono); font-size: 11.5px; font-weight: 700; color: #ffd7dd;
background: rgba(251,113,133,.1); border: 1px solid rgba(251,113,133,.4);
padding: 1px 7px; border-radius: 6px; box-shadow: inset 0 0 0 1px rgba(0,0,0,.2);
}
.code.neutral { color: #ffe6b3; background: rgba(240,180,41,.1); border-color: rgba(240,180,41,.4); }
.err-ramp .note { color: var(--muted); font-size: 12px; }
/* ---- provider external callout (inside failover) ---- */
.provider-row { display: grid; grid-template-columns: 1fr; gap: 10px; margin-top: 9px; }
.provider {
border: 1px dashed rgba(240,180,41,.5); border-radius: 12px;
background: linear-gradient(180deg, rgba(240,180,41,.06), transparent 70%), var(--panel);
padding: 11px 13px; display: flex; align-items: center; gap: 12px; flex-wrap: wrap;
}
.provider .pic {
width: 34px; height: 34px; border-radius: 9px; flex: none; display: grid; place-items: center;
background: rgba(240,180,41,.12); border: 1px solid rgba(240,180,41,.4); color: #ffd98a;
}
.provider .pic svg { width: 18px; height: 18px; }
.provider .ptxt { min-width: 0; }
.provider .ptitle { font-family: var(--mono); font-size: 12.5px; font-weight: 700; color: #ffe9b0; }
.provider .pdesc { font-size: 12px; color: var(--text-2); }
.provider .pdesc code { font-size: 11px; }
/* ---- outcome branches inside failover ---- */
.branch { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; margin-top: 11px; }
@media (max-width: 720px) { .branch { grid-template-columns: 1fr; } }
.outcome {
border-radius: 14px; padding: 13px 14px; border: 1px solid var(--border);
background: var(--panel); position: relative;
transition: transform .2s ease, border-color .2s ease;
}
.outcome:hover { transform: translateY(-2px); }
.outcome.ok { border-color: rgba(52,211,153,.34); background: linear-gradient(180deg, rgba(52,211,153,.07), transparent 70%), var(--panel); }
.outcome.fail { border-color: rgba(251,113,133,.34); background: linear-gradient(180deg, rgba(251,113,133,.07), transparent 70%), var(--panel); }
.outcome .otag {
font-family: var(--mono); font-size: 10.5px; font-weight: 700; letter-spacing: .1em;
text-transform: uppercase; display: inline-flex; align-items: center; gap: 6px;
padding: 3px 8px; border-radius: 6px;
}
.outcome.ok .otag { color: #aef0cf; background: rgba(52,211,153,.14); border: 1px solid rgba(52,211,153,.35); }
.outcome.fail .otag { color: #ffb4bd; background: rgba(251,113,133,.14); border: 1px solid rgba(251,113,133,.35); }
.outcome .olist { margin: 9px 0 0; padding: 0; list-style: none; }
.outcome .olist li {
font-size: 12.5px; color: var(--text-2); padding: 3px 0 3px 16px; position: relative;
}
.outcome .olist li::before {
content: ""; position: absolute; left: 4px; top: 11px; width: 5px; height: 5px; border-radius: 50%;
}
.outcome.ok .olist li::before { background: var(--response); }
.outcome.fail .olist li::before { background: var(--error); }
.outcome .olist li b { color: var(--text); font-weight: 600; }
.outcome .olist li code { font-size: 11px; }
.outcome .olist .sub { padding-left: 30px; color: var(--muted); font-size: 11.5px; }
.outcome .olist .sub::before { display: none; }
.outcome .olist .sub::after { content: "↳"; position: absolute; left: 16px; top: 3px; color: var(--faint); }
.loop {
margin-top: 9px; display: inline-flex; align-items: center; gap: 7px;
font-family: var(--mono); font-size: 11.5px; color: #ffd7dd;
background: rgba(251,113,133,.08); border: 1px dashed rgba(251,113,133,.4);
padding: 4px 9px; border-radius: 8px;
}
.loop .spin { animation: spin 3.4s linear infinite; display: inline-block; }
@keyframes spin { to { transform: rotate(360deg); } }
.exhausted { margin-top: 11px; display: flex; align-items: center; gap: 8px; flex-wrap: wrap; }
.exhausted .arrow { font-family: var(--mono); color: var(--error); font-size: 12px; }
/* ---- Ok(true) terminal ---- */
.terminal {
width: 100%; max-width: 520px; text-align: center;
border: 1px solid rgba(45,212,191,.4); border-radius: 16px;
background: linear-gradient(180deg, rgba(45,212,191,.08), transparent 70%), var(--panel);
padding: 16px 18px; box-shadow: var(--shadow-sm);
}
.terminal .tag {
font-family: var(--mono); font-size: 10.5px; letter-spacing: .14em; text-transform: uppercase;
color: #c7f6ec; background: rgba(45,212,191,.12); border: 1px solid rgba(45,212,191,.4);
padding: 2px 8px; border-radius: 6px; font-weight: 600;
}
.terminal .ttitle { font-family: var(--mono); font-size: 16px; font-weight: 800; margin: 8px 0 4px; color: #eaffb8; }
.terminal .tdesc { font-size: 13px; color: var(--text-2); margin: 0; }
.terminal .tdesc b { color: var(--text); }
/* ---- removed-mechanisms footnote strip ---- */
.removed {
width: 100%; max-width: 780px; margin-top: 18px;
border: 1px solid var(--border); border-radius: 14px;
background: repeating-linear-gradient(135deg, rgba(248,81,73,.04) 0 10px, transparent 10px 20px), var(--panel);
padding: 12px 15px; display: flex; gap: 12px; align-items: flex-start; flex-wrap: wrap;
}
.removed .rk {
font-family: var(--mono); font-size: 10.5px; font-weight: 700; letter-spacing: .12em;
text-transform: uppercase; color: #ffb4bd; flex: none;
border: 1px solid rgba(248,81,73,.35); background: rgba(248,81,73,.1);
padding: 3px 8px; border-radius: 6px;
}
.removed .rlist { font-size: 12.5px; color: var(--muted); line-height: 1.7; }
.removed .rlist code { font-size: 11px; color: #d8c2c6; background: rgba(248,81,73,.07); border-color: rgba(248,81,73,.2); }
.removed .rlist .strike { text-decoration: line-through; text-decoration-color: rgba(248,81,73,.5); }
/* ============================== KEY POLICIES ============================== */
section.policies { padding: 56px 0 30px; }
.section-title { font-size: clamp(22px, 3vw, 30px); font-weight: 800; letter-spacing: -.02em; margin: 0 0 6px; }
.section-title .grad { background: var(--grad); -webkit-background-clip: text; background-clip: text; color: transparent; }
.section-sub { color: var(--text-2); font-size: 14.5px; margin: 0 0 26px; }
.cards { display: grid; gap: 14px; grid-template-columns: repeat(auto-fill, minmax(250px, 1fr)); }
.card {
background: linear-gradient(180deg, rgba(255,255,255,.03), transparent 70%), var(--panel);
border: 1px solid var(--border); border-radius: 14px; padding: 16px;
transition: transform .2s ease, border-color .2s ease, box-shadow .2s ease;
}
.card:hover { transform: translateY(-3px); border-color: var(--border-2); box-shadow: var(--shadow); }
.card .ic { width: 36px; height: 36px; border-radius: 10px; flex: none; display: grid; place-items: center; margin-bottom: 11px; }
.card .ic svg { width: 19px; height: 19px; }
.card h3 { margin: 0 0 5px; font-size: 15px; font-weight: 700; }
.card p { margin: 0; color: var(--text-2); font-size: 13px; line-height: 1.5; }
.card p b { color: var(--text); font-weight: 600; }
.card p code { font-size: 11.5px; }
.card.c-1 .ic { background: rgba(45,212,191,.1); border: 1px solid rgba(45,212,191,.32); color: #7fe7d0; }
.card.c-2 .ic { background: rgba(167,139,250,.1); border: 1px solid rgba(167,139,250,.3); color: #cdb6ff; }
.card.c-3 .ic { background: rgba(240,180,41,.1); border: 1px solid rgba(240,180,41,.32); color: #ffd98a; }
.card.c-4 .ic { background: rgba(251,113,133,.1); border: 1px solid rgba(251,113,133,.32); color: #ffabc4; }
.card.c-5 .ic { background: rgba(63,185,80,.1); border: 1px solid rgba(63,185,80,.32); color: #93e6a3; }
.card.c-6 .ic { background: rgba(76,141,255,.1); border: 1px solid rgba(76,141,255,.3); color: #9cc2ff; }
.card.c-7 .ic { background: rgba(167,139,250,.1); border: 1px solid rgba(167,139,250,.3); color: #cdb6ff; }
.card.c-8 .ic { background: rgba(52,211,153,.1); border: 1px solid rgba(52,211,153,.32); color: #7fe7bd; }
/* footer */
footer.site { border-top: 1px solid var(--border); margin-top: 40px; padding: 26px 0 70px; color: var(--faint); font-size: 12.5px; }
footer.site .wrap { display: flex; flex-wrap: wrap; gap: 8px 18px; justify-content: space-between; align-items: center; }
footer.site a { color: var(--text-2); }
/* ---- entrance animation ---- */
@keyframes rise { from { opacity: 0; transform: translateY(16px); } to { opacity: 1; transform: translateY(0); } }
.rise { animation: rise .6s cubic-bezier(.2,.75,.2,1) both; }
/* ============================== RESPONSIVE ============================== */
@media (max-width: 720px) {
header.site { padding: 44px 0 4px; }
.node { padding: 14px 15px 14px 17px; }
.group { padding: 12px; }
.step { grid-template-columns: 24px 1fr; }
.terminal { padding: 14px 15px; }
}
/* ============================== REDUCED MOTION ============================== */
@media (prefers-reduced-motion: reduce) {
*, *::before, *::after { animation: none !important; transition: none !important; scroll-behavior: auto !important; }
.rise { opacity: 1 !important; transform: none !important; }
}
</style>
</head>
<body>
<div class="bg-layers" aria-hidden="true"></div>
<!-- ============================== HEADER ============================== -->
<header class="site">
<div class="wrap">
<div class="brand rise">
<div class="mark" aria-hidden="true">
<svg viewBox="0 0 24 24" fill="none" stroke="#fff" stroke-width="2" stroke-linecap="round" stroke-linejoin="round">
<path d="M3 7c3 0 4 5 7 5s4-5 7-5" opacity=".75"/>
<path d="M3 12c3 0 4 5 7 5s4-5 7-5"/>
<path d="M3 17c3 0 4 0 7 0" opacity=".5"/>
<circle cx="20" cy="12" r="1.6" fill="#fff" stroke="none"/>
</svg>
</div>
<h1><span class="grad">Hydra</span> <span class="tag">Terminate Mode</span></h1>
</div>
<p class="subtitle rise" style="animation-delay:.06s">
A high-performance <b>LLM routing gateway</b> on Pingora — the runtime request-handling
workflow in <span class="hot"><b>terminate-in-Pingora</b></span> mode. The gateway
<b>terminates the request inside <code>request_filter</code></b>, calls the provider with its
own <code>reqwest</code> client, and streams the SSE response back — returning
<code>Ok(true)</code> so Pingora never dials upstream.
</p>
<div class="legend rise" style="animation-delay:.12s" aria-label="node color legend">
<span class="lbl">stages</span>
<span class="chip"><i class="c-ingress"></i>ingress</span>
<span class="chip"><i class="c-filter"></i>request_filter</span>
<span class="chip"><i class="c-failover"></i>failover loop</span>
<span class="chip"><i class="c-response"></i>response stream</span>
<span class="chip"><i class="c-logging"></i>logging</span>
<span class="chip"><i class="c-error"></i>error exit</span>
</div>
</div>
</header>
<!-- ============================== FLOW ============================== -->
<main>
<section class="flow">
<div class="wrap">
<div class="flow-stage-label">Request lifecycle</div>
<div class="flow">
<!-- INGRESS -->
<div class="node s-ingress rise" style="animation-delay:.14s">
<div class="head">
<span class="stage-tag">ingress</span>
<span class="title">Client request</span>
</div>
<p class="desc">Arrives at the <b>Pingora ProxyService</b> (TLS / SNI terminated, H2) carrying
everything the gateway needs to route and authenticate.</p>
<div class="payload">
<span class="k"><b>Host</b> · domain</span>
<span class="k"><b>Authorization</b> · api-key</span>
<span class="k"><b>body</b> · <code>model</code></span>
</div>
</div>
<div class="conn rise" style="animation-delay:.18s" aria-hidden="true"></div>
<!-- request_filter GROUP -->
<div class="group g-filter rise" style="animation-delay:.2s">
<div class="group-head">
<span class="badge">request_filter</span>
<span class="gtitle">the gating stage — auth, full-body model extraction, routing & pre-limit.
<b>Returns <code>Ok(true)</code></b> only after the whole pipeline below succeeds.</span>
</div>
<div class="steps">
<!-- 1 -->
<div class="step">
<div class="num">1</div>
<div class="body">
<div class="stitle">Resolve <span class="fn">domain → tenant</span></div>
<div class="sdesc">Lookup by <b>Host</b>; missing / <code>localhost</code> matches the <code>localhost</code> tenant.</div>
<div class="err-ramp">
<span class="arrow">✗ not found / disabled</span>
<span class="code">404</span><span class="code">403</span>
</div>
</div>
</div>
<!-- 2 -->
<div class="step">
<div class="num">2</div>
<div class="body">
<div class="stitle">Parse <span class="fn">client api-key</span></div>
<div class="sdesc">Extract credential from <code>Authorization: Bearer …</code> or <code>x-api-key</code>.</div>
</div>
</div>
<!-- 3 -->
<div class="step">
<div class="num">3</div>
<div class="body">
<div class="stitle"><span class="fn">External auth</span> — AuthChecker, cache-first</div>
<div class="sdesc">Cache key = <b>tenant + sha256(key)</b>, <b>5-min TTL</b>. Hit → reuse verdict.
Miss → <code>POST tenant.auth_url</code>.</div>
<div class="err-ramp">
<span class="arrow">2xx → cache {allow}</span><span class="note">pass</span>
<span class="arrow" style="margin-left:6px">401·403 → cache {deny}</span><span class="code">401</span>
</div>
<div class="err-ramp">
<span class="arrow">5xx / timeout</span><span class="note">→ fail_mode:</span>
<span class="code">503</span><span class="note">(closed)</span>
<span class="code neutral">pass</span><span class="note">(open)</span>
</div>
</div>
</div>
<!-- 4 — KEY CHANGE -->
<div class="step">
<div class="num">4</div>
<div class="body">
<div class="stitle">Read <span class="fn">FULL body</span> → extract model
<span class="keychange">key change</span>
</div>
<div class="sdesc"><code>read_request_body</code> loop <b>to EOS</b> (entire body buffered).
Extract <code>model</code> via <b>memchr on the FULL body</b> — works at <b>any position / nesting / schema</b>.</div>
<div class="err-ramp">
<span class="arrow">non-JSON / no model</span>
<span class="code neutral">passthrough</span><span class="note">(degenerate single-candidate)</span>
</div>
</div>
</div>
<!-- 5 -->
<div class="step">
<div class="num">5</div>
<div class="body">
<div class="stitle"><span class="fn">Route</span> — <code>router::resolve</code> + <code>swrr::order</code></div>
<div class="sdesc"><b>TenantModel</b> gate ∩ <b>online providers</b>(model) ∩ <b>tenant-allowed</b>;
drop dead / no-key / weight=0. Then <b>SWRR</b> weighted ordering → <code>candidates[]</code>.</div>
<div class="err-ramp">
<span class="arrow">✗ empty set</span>
<span class="code">403</span><span class="code">503</span>
</div>
</div>
</div>
<!-- 6 -->
<div class="step">
<div class="num">6</div>
<div class="body">
<div class="stitle"><span class="fn">Pre-limit</span> — RateLimiter count window</div>
<div class="sdesc">In-memory sliding count check before any provider work.</div>
<div class="err-ramp">
<span class="arrow">✗ over limit</span><span class="code">429</span>
</div>
</div>
</div>
</div>
</div>
<div class="conn violet rise" style="animation-delay:.24s" aria-hidden="true"></div>
<!-- FAILOVER FOR-LOOP GROUP -->
<div class="group g-failover rise" style="animation-delay:.26s">
<div class="group-head">
<span class="badge">failover for-loop</span>
<span class="gtitle">a plain <code>for candidate in candidates</code> loop — <b>not</b> Pingora's retry
mechanism. Body is already in hand, so each replay is a cheap <code>Bytes::clone()</code> (O(1)).</span>
</div>
<div class="steps">
<!-- 7 -->
<div class="step">
<div class="num">7</div>
<div class="body">
<div class="stitle"><span class="fn">build_request</span> · record <span class="fn">forward_latency_ms</span></div>
<div class="sdesc">Swap <code>Authorization</code> = <b>provider key</b> · <code>/v1</code> path rewrite ·
set <code>Host</code> · inject <code>X-Hydra-Trace-Id</code>.
<b><code>forward_latency_ms</code></b> captures Hydra overhead (auth + route + body read).</div>
</div>
</div>
<!-- 8 — provider call -->
<div class="step">
<div class="num">8</div>
<div class="body">
<div class="stitle"><span class="fn">provider_client.send(req)</span></div>
<div class="sdesc">Send through the shared <code>reqwest</code> pool and branch on the outcome.</div>
<!-- external provider callout -->
<div class="provider-row">
<div class="provider">
<div class="ic"><svg viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><path d="M7 18a4 4 0 0 1-.5-7.97A6 6 0 0 1 18 9.5a3.5 3.5 0 0 1-.5 6.93"/></svg></div>
<div class="ptxt">
<div class="ptitle">► REAL PROVIDER</div>
<div class="pdesc"><code>reqwest</code> · rustls · H2 · shared pool
(<code>pool_max_idle_per_host 32</code>) · <code>300s</code> timeout</div>
</div>
<div class="pdesc" style="margin-left:auto; text-align:right; color:var(--faint); font-size:11px;">
req →<br>SSE ←
</div>
</div>
</div>
<!-- two outcomes -->
<div class="branch">
<!-- success -->
<div class="outcome ok">
<span class="otag">✓ 2xx success</span>
<ul class="olist">
<li><b>breaker.on_success</b></li>
<li><code>set_keepalive(None)</code></li>
<li><code>write_response_header</code> → client</li>
<li><b>while</b> SSE chunk from provider:</li>
<li class="sub">record <code>ttft_ms</code> <b>(first chunk only)</b></li>
<li class="sub">memchr scan <code>"usage"</code> (cached + prompt + completion)</li>
<li class="sub"><code>write_response_body(chunk)</code> → client <b>(stream pass-through)</b></li>
<li><b>break</b> ← success</li>
</ul>
</div>
<!-- fail -->
<div class="outcome fail">
<span class="otag">✗ fail · 4xx / 5xx / connect error</span>
<ul class="olist">
<li><b>breaker.on_failure</b></li>
<li><code>record_retry("terminate_loop")</code></li>
</ul>
<div class="loop"><span class="spin">↻</span> <code>continue</code> → next candidate <b>(body in hand, O(1) replay)</b></div>
</div>
</div>
<div class="exhausted">
<span class="arrow">all candidates exhausted</span><span class="code">502</span>
</div>
</div>
</div>
</div>
</div>
<div class="conn green rise" style="animation-delay:.30s" aria-hidden="true">
<span class="conn-label">on success</span>
</div>
<!-- LOGGING GROUP -->
<div class="group g-logging rise" style="animation-delay:.32s">
<div class="group-head">
<span class="badge">logging</span>
<span class="gtitle">record once the response is fully streamed back.</span>
</div>
<div class="steps">
<div class="step">
<div class="num">9</div>
<div class="body">
<div class="stitle"><span class="fn">UsageSink.record</span> + metrics</div>
<div class="sdesc"><b>Tenant / provider / model</b> +
<b>5 token dims</b> (<code>prompt</code> · <code>completion</code> · <code>total</code> · <code>cached</code> — all <b>default 0</b>)
+ <b>2 latency dims</b> (<code>forward_latency_ms</code> · <code>ttft_ms</code>).</div>
<div class="err-ramp" style="margin-top:6px">
<span class="note">→ </span><span class="code neutral">SQLite</span><span class="note">(default)</span>
<span class="code neutral">ClickHouse</span><span class="note">(optional)</span>
</div>
<div class="sdesc" style="margin-top:7px"><b>Prometheus</b>: <code>hydra_requests_total</code> · <code>hydra_ttft_seconds</code> · …
+ <code>breaker.on_success</code> <b>(if not already called)</b>.</div>
</div>
</div>
</div>
</div>
<div class="conn teal rise" style="animation-delay:.36s" aria-hidden="true"></div>
<!-- TERMINAL -->
<div class="terminal rise" style="animation-delay:.38s">
<span class="tag">terminate</span>
<div class="ttitle">return Ok(true)</div>
<p class="tdesc">Pingora does <b>NOT</b> dial upstream — the response is already written to the client.</p>
</div>
<!-- removed-mechanisms footnote -->
<div class="removed rise" style="animation-delay:.42s">
<span class="rk">removed</span>
<div class="rlist">
<span class="strike"><code>upstream_peer</code></span> (sentinel, never called) ·
<span class="strike"><code>request_body_filter</code></span> ·
<span class="strike"><code>upstream_request_filter</code></span> ·
<span class="strike"><code>upstream_response_body_filter</code></span> ·
<span class="strike"><code>response_filter</code></span> ·
<span class="strike"><code>enable_retry_buffering</code></span> ·
<span class="strike"><code>set_retry</code></span> ·
<span class="strike"><code>Vec<Bytes></code></span> accumulator ·
<span class="strike"><code>fail_to_connect</code></span> ·
<span class="strike"><code>error_while_proxy</code></span> ·
<span class="strike"><code>retry_after_connect</code></span> ·
<span class="strike"><code>body_too_large</code></span> / <code>BODY_BUF_LIMIT</code>
</div>
</div>
</div><!-- /.flow -->
</div>
</section>
<!-- ============================== KEY POLICIES ============================== -->
<section class="policies">
<div class="wrap">
<h2 class="section-title"><span class="grad">Key policies</span></h2>
<p class="section-sub">The guarantees and trade-offs encoded across the terminate-mode pipeline.</p>
<div class="cards">
<div class="card c-1">
<div class="ic"><svg viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><path d="M4 5h16M4 12h10M4 19h7"/><path d="m17 16 3 3 3-3"/><path d="M20 11v8"/></svg></div>
<h3>Terminate mode</h3>
<p>Reads the <b>full body</b> in <code>request_filter</code> → <code>model</code> at <b>any position</b> →
<code>reqwest</code> call to the provider → SSE stream-back via <code>session.write_response_body</code>.
Returns <code>Ok(true)</code>.</p>
</div>
<div class="card c-2">
<div class="ic"><svg viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><circle cx="6" cy="6" r="2.5"/><circle cx="18" cy="6" r="2.5"/><circle cx="12" cy="18" r="2.5"/><path d="M7.5 7.5 11 16M16.5 7.5 13 16M8 6h8"/></svg></div>
<h3>Routing</h3>
<p>model ∩ TenantModel-gate ∩ online providers ∩ tenant-allowed.
<b>Nginx SWRR</b> weighted round-robin orders the candidates.</p>
</div>
<div class="card c-3">
<div class="ic"><svg viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><path d="M21 12a9 9 0 1 1-3-6.7"/><path d="M21 4v4h-4"/></svg></div>
<h3>Failover</h3>
<p>A plain <code>for</code> loop with <code>Bytes::clone()</code> <b>O(1)</b> replay.
<b>No Pingora retry mechanism</b> — no <code>set_retry</code>, no buffer truncation.</p>
</div>
<div class="card c-4">
<div class="ic"><svg viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><path d="M13 2 4 14h7l-1 8 9-12h-7l1-8Z"/></svg></div>
<h3>Circuit breaker</h3>
<p><b>N consecutive failures</b> → provider enters the dead-set and is skipped.
A background probe revives it once it heals.</p>
</div>
<div class="card c-5">
<div class="ic"><svg viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><path d="M5 12a7 7 0 0 1 14 0"/><path d="M2 12h2M20 12h2M12 2v2M5 5l1.5 1.5M19 5l-1.5 1.5"/><path d="M12 12l4-2"/></svg></div>
<h3>Rate limit</h3>
<p>In-memory <b>sliding window</b> — count pre-flight + tokens post-flight,
across <code>m / h / d</code> windows.</p>
</div>
<div class="card c-6">
<div class="ic"><svg viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><path d="M4 19V5"/><path d="M4 19h16"/><rect x="7" y="11" width="3" height="6"/><rect x="12" y="7" width="3" height="10"/><rect x="17" y="13" width="3" height="4"/></svg></div>
<h3>Usage</h3>
<p><b>5 token dims</b> (prompt / completion / total / cached / default-0) +
<b>2 latency dims</b> (forward_latency / TTFT). Sink to <b>SQLite</b> (default) or ClickHouse.</p>
</div>
<div class="card c-7">
<div class="ic"><svg viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><path d="M12 2 4 5v7c0 5 3.5 8 8 10 4.5-2 8-5 8-10V5l-8-3Z"/><path d="M9 12l2 2 4-4"/></svg></div>
<h3>Auth</h3>
<p>Cache-first, <b>5-min TTL</b>. Denials cached with a short TTL.
<code>DELETE /api/v1/auth/cache</code> forces re-auth on the next request.</p>
</div>
<div class="card c-8">
<div class="ic"><svg viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><rect x="4" y="10" width="16" height="10" rx="2"/><path d="M8 10V7a4 4 0 0 1 8 0v3"/><circle cx="12" cy="15" r="1.4"/></svg></div>
<h3>TLS</h3>
<p><b>SNI-based</b> per-tenant certificate (BoringSSL callback) with
<b>hot-reload</b> — no restart needed to rotate certs.</p>
</div>
</div>
</div>
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<span>Hydra · request-handling workflow · terminate-in-Pingora mode</span>
<span><code style="font-family:var(--mono)">Pingora · reqwest · BoringSSL</code></span>
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