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pulls/pr_01m47d24b0e6n91zwymwxg0vpx

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pr_01m47d24b0e6n91zwymwxg0vpx/services/billing/src/keeper.rs

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1//! Keeps every price current with what g1t actually pays.
2//!
3//! g1t passes its own costs through, so a price is only right while the
4//! cost under it is. Two jobs keep them right, on the billing service's
5//! cron:
6//!
7//! - **Settling runs** (every 15 minutes). A model run is charged when it
8//! finishes at what the sandbox reported. Each of g1t's hosted runs goes
9//! through its AI Gateway, which prices every request at the provider's
10//! current rates and logs it with the run's session. Settling sums those
11//! logs and corrects the charge to the gateway's figure, with a
12//! correction on the statement. A run whose sandbox died before
13//! reporting is charged here instead of never.
14//! - **Checking costs** (daily). What Cloudflare billed g1t's account, from
15//! its usage API, is measured against how much was used: Containers
16//! against the seconds containers ran, Workers for Platforms per request
17//! and per CPU millisecond. When a measured cost moves, the price book
18//! moves with it, since each price is its cost plus a set markup, and
19//! the change is recorded where anyone can see it. A measurement far off
20//! the current cost is not adopted, only logged, so one odd day of data
21//! cannot reprice everything.
22
23use g1t_contracts::billing::{EntryKind, MICROS_PER_DOLLAR, Price, PriceBook, PriceChange};
24use g1t_contracts::new_id;
25use g1t_contracts::time::rfc3339;
26use g1t_kit::now_ms;
27use serde::Deserialize;
28use serde_json::{Value, json};
29use worker::{Env, Fetch, Headers, Method, Request, RequestInit, Result};
30
31use crate::{Billing, RunRow, charge_micros};
32
33/// The cron that also checks costs against Cloudflare's bill.
34pub(crate) const DAILY: &str = "17 4 * * *";
35
36/// A run is settled once its logs have had time to land.
37const SETTLE_AFTER_MS: u64 = 5 * 60 * 1000;
38/// A run with no gateway logs after this is left as reported.
39const GIVE_UP_AFTER_MS: u64 = 3 * 60 * 60 * 1000;
40/// A run never finished after this died without reporting.
41const ABANDONED_AFTER_MS: u64 = 3 * 60 * 60 * 1000;
42/// Smaller moves are noise.
43const MIN_CHANGE: f64 = 0.02;
44/// A measurement outside this factor of the current cost is suspect.
45const MAX_FACTOR: f64 = 4.0;
46
47/// Where the keeper reads what g1t pays.
48pub(crate) struct Keeper {
49 /// `CLOUDFLARE_USAGE_TOKEN`: Billing, Account Analytics and AI Gateway,
50 /// read only.
51 token: Option<String>,
52 account: String,
53 gateway: String,
54}
55
56impl Keeper {
57 pub(crate) fn from_env(env: &Env) -> Self {
58 let var = |name: &str| env.var(name).map(|v| v.to_string()).unwrap_or_default();
59 Keeper {
60 token: env.secret("CLOUDFLARE_USAGE_TOKEN").ok().map(|v| v.to_string()).filter(|v| !v.is_empty()),
61 account: var("CLOUDFLARE_ACCOUNT_ID"),
62 gateway: var("AI_GATEWAY_ID"),
63 }
64 }
65
66 async fn send(&self, method: Method, url: &str, body: Option<Value>) -> Result<Value> {
67 let Some(token) = &self.token else {
68 return Err(worker::Error::RustError("no CLOUDFLARE_USAGE_TOKEN".into()));
69 };
70 let headers = Headers::new();
71 headers.set("authorization", &format!("Bearer {token}"))?;
72 headers.set("content-type", "application/json")?;
73 let mut init = RequestInit::new();
74 init.with_method(method).with_headers(headers);
75 if let Some(body) = body {
76 init.with_body(Some(body.to_string().into()));
77 }
78 let mut response = Fetch::Request(Request::new_with_init(url, &init)?).send().await?;
79 let status = response.status_code();
80 let value: Value = response.json().await.unwrap_or(Value::Null);
81 if status != 200 {
82 return Err(worker::Error::RustError(format!("Cloudflare answered {status}: {value}")));
83 }
84 Ok(value)
85 }
86
87 fn api(&self, path: &str) -> String {
88 format!("https://api.cloudflare.com/client/v4/accounts/{}{path}", self.account)
89 }
90
91 /// What AI Gateway priced a session's requests at, in dollars, and how
92 /// many there were.
93 async fn session_cost(&self, session: &str) -> Result<(f64, u32)> {
94 let mut cost = 0.0;
95 let mut count = 0;
96 for page in 1..=40 {
97 // The filter goes as URL-encoded JSON; the bracket form is
98 // ignored, and would sum every log there is. Session ids are
99 // [a-z0-9_], which need no escaping inside it.
100 let filter = format!(
101 "%5B%7B%22key%22%3A%22metadata.value%22%2C%22operator%22%3A%22eq%22%2C%22value%22%3A%5B%22{session}%22%5D%7D%5D"
102 );
103 let url = self.api(&format!(
104 "/ai-gateway/gateways/{}/logs?per_page=50&page={page}&filters={filter}",
105 self.gateway
106 ));
107 let body = self.send(Method::Get, &url, None).await?;
108 let logs = body["result"].as_array().cloned().unwrap_or_default();
109 for log in &logs {
110 cost += log["cost"].as_f64().unwrap_or(0.0);
111 count += 1;
112 }
113 if logs.len() < 50 {
114 break;
115 }
116 }
117 Ok((cost, count))
118 }
119
120 /// The account's billable usage, one row per service per day, as
121 /// Cloudflare reports it.
122 async fn billable_usage(&self, from: &str, to: &str) -> Result<Vec<UsageRow>> {
123 let body = self
124 .send(Method::Get, &self.api(&format!("/billable-usage?from={from}&to={to}")), None)
125 .await?;
126 let rows = body["result"].as_array().cloned().unwrap_or_default();
127 Ok(rows.iter().filter_map(UsageRow::from_value).collect())
128 }
129
130 /// What g1t's containers used from `since` to `until` (dates), as
131 /// Cloudflare bills it: memory in byte-seconds, and CPU seconds.
132 async fn container_usage(&self, since: &str, until: &str) -> Result<ContainerUsage> {
133 let query = "query ($account: String!, $since: Date!, $until: Date!) {
134 viewer { accounts(filter: { accountTag: $account }) {
135 containersUsageAdaptiveGroups(limit: 1000, filter: { date_geq: $since, date_leq: $until }) {
136 sum { cpuTimeSec allocatedMemory }
137 }
138 } }
139 }";
140 let body = self
141 .send(
142 Method::Post,
143 "https://api.cloudflare.com/client/v4/graphql",
144 Some(json!({ "query": query, "variables": { "account": self.account, "since": since, "until": until } })),
145 )
146 .await?;
147 let groups = body["data"]["viewer"]["accounts"][0]["containersUsageAdaptiveGroups"]
148 .as_array()
149 .cloned()
150 .unwrap_or_default();
151 Ok(groups.iter().fold(ContainerUsage::default(), |total, g| ContainerUsage {
152 cpu_seconds: total.cpu_seconds + g["sum"]["cpuTimeSec"].as_f64().unwrap_or(0.0),
153 memory_byte_seconds: total.memory_byte_seconds + g["sum"]["allocatedMemory"].as_f64().unwrap_or(0.0),
154 }))
155 }
156}
157
158#[derive(Debug, Default, Clone, Copy)]
159pub(crate) struct ContainerUsage {
160 cpu_seconds: f64,
161 memory_byte_seconds: f64,
162}
163
164/// g1t's sandboxes: Containers' standard-1, half a vCPU, 4 GiB, 8 GB disk.
165const SANDBOX_GIB: f64 = 4.0;
166const SANDBOX_DISK_GB: f64 = 8.0;
167const GIB: f64 = 1024.0 * 1024.0 * 1024.0;
168/// The Durable Object behind each container is billed for as long as the
169/// container runs, at 128 MB.
170const SANDBOX_DO_GB: f64 = 0.125;
171
172/// Cloudflare's published Containers rates, in dollars, used for any rate
173/// the bill does not show yet (while usage is inside the included amount).
174const LIST_MEMORY_GIB_SECOND: f64 = 0.000_002_5;
175const LIST_DISK_GB_SECOND: f64 = 0.000_000_07;
176const LIST_VCPU_SECOND: f64 = 0.000_02;
177/// Durable Objects duration: $12.50 per million GB-seconds.
178const LIST_DO_GB_SECOND: f64 = 0.000_012_5;
179
180/// What one second of a sandbox costs whatever it does, in millionths of a
181/// dollar: its memory and disk, and the Durable Object behind it, for the
182/// whole second. CPU is billed only while busy, on top.
183pub(crate) fn sandbox_base_micros(memory: f64, disk: f64, durable_object: f64) -> f64 {
184 (SANDBOX_GIB * memory + SANDBOX_DISK_GB * disk + SANDBOX_DO_GB * durable_object) * MICROS_PER_DOLLAR as f64
185}
186
187/// What one second of a sandbox costs on average, in millionths of a
188/// dollar: its base, and the CPU sandboxes actually use per second of
189/// running. Runs that report their own CPU are priced on it instead (see
190/// `run_cost`).
191pub(crate) fn sandbox_second_micros(usage: ContainerUsage, memory: f64, disk: f64, vcpu: f64, durable_object: f64) -> Option<f64> {
192 let instance_seconds = usage.memory_byte_seconds / (SANDBOX_GIB * GIB);
193 if instance_seconds < 3600.0 {
194 return None;
195 }
196 let cpu_share = usage.cpu_seconds / instance_seconds;
197 Some(sandbox_base_micros(memory, disk, durable_object) + cpu_share * vcpu * MICROS_PER_DOLLAR as f64)
198}
199
200/// What a run that reported its own CPU cost g1t: its base for every
201/// second, and its vCPU-seconds at the vCPU rate.
202pub(crate) fn run_cost(seconds: i64, cpu_seconds: f64, base_per_second: f64, per_vcpu_second: f64) -> f64 {
203 seconds.max(0) as f64 * base_per_second + cpu_seconds.max(0.0) * per_vcpu_second
204}
205
206/// A unit's marginal rate from the bill: the median, over the days that
207/// were charged, of cost over quantity. None while nothing was charged.
208pub(crate) fn billed_rate(rows: &[&UsageRow]) -> Option<f64> {
209 let mut rates: Vec<f64> = rows
210 .iter()
211 .filter(|r| r.cost > 0.0 && r.quantity > 0.0)
212 .map(|r| r.cost / r.quantity)
213 .collect();
214 if rates.is_empty() {
215 return None;
216 }
217 rates.sort_by(f64::total_cmp);
218 Some(rates[rates.len() / 2])
219}
220
221/// One line of Cloudflare's billable usage.
222#[derive(Debug, Clone)]
223pub(crate) struct UsageRow {
224 period_start: String,
225 period_end: String,
226 service: String,
227 unit: String,
228 quantity: f64,
229 cost: f64,
230}
231
232impl UsageRow {
233 /// Read leniently: the API is new, and its field names are FOCUS's.
234 fn from_value(row: &Value) -> Option<Self> {
235 let text = |keys: &[&str]| keys.iter().find_map(|k| row[*k].as_str()).unwrap_or_default().to_owned();
236 let number = |keys: &[&str]| {
237 keys.iter()
238 .find_map(|k| row[*k].as_f64().or_else(|| row[*k].as_str().and_then(|s| s.parse().ok())))
239 .unwrap_or(0.0)
240 };
241 let service = text(&["ServiceName", "service_name", "service"]);
242 if service.is_empty() {
243 return None;
244 }
245 let family = text(&["ServiceFamilyName", "service_family_name"]);
246 Some(UsageRow {
247 period_start: text(&["ChargePeriodStart", "charge_period_start"]),
248 period_end: text(&["ChargePeriodEnd", "charge_period_end"]),
249 service: if family.is_empty() { service } else { format!("{family} / {service}") },
250 unit: text(&["PricingUnit", "ConsumedUnit", "consumed_unit"]),
251 quantity: number(&["PricingQuantity", "ConsumedQuantity", "pricing_quantity"]),
252 // What g1t pays; list price if nothing was contracted.
253 cost: Some(number(&["ContractedCost", "BilledCost", "contracted_cost"]))
254 .filter(|cost| *cost > 0.0)
255 .unwrap_or_else(|| number(&["ListCost", "list_cost"])),
256 })
257 }
258}
259
260/// What a cost should become from a measurement, or why not.
261pub(crate) fn adopt(current: f64, measured: f64) -> std::result::Result<Option<f64>, String> {
262 if !measured.is_finite() || measured <= 0.0 {
263 return Err("nothing to measure".into());
264 }
265 let ratio = measured / current;
266 if !(1.0 / MAX_FACTOR..=MAX_FACTOR).contains(&ratio) {
267 return Err(format!("measured {measured:.4} against {current:.4}, too far off to adopt"));
268 }
269 Ok(((ratio - 1.0).abs() >= MIN_CHANGE).then_some(measured))
270}
271
272#[derive(Deserialize)]
273struct PriceRow {
274 meter: String,
275 title: String,
276 unit: String,
277 cost_micros: f64,
278 markup_percent: u32,
279 source: String,
280 checked_at: Option<String>,
281 updated_at: String,
282}
283
284#[derive(Deserialize)]
285struct ChangeRow {
286 meter: String,
287 old_cost_micros: f64,
288 new_cost_micros: f64,
289 markup_percent: u32,
290 old_markup_percent: Option<u32>,
291 reason: String,
292 created_at: String,
293}
294
295#[derive(Deserialize)]
296struct Unsettled {
297 id: String,
298 workspace: String,
299 repo: String,
300 number: u32,
301 task: String,
302 model: String,
303 token_hash: String,
304 billed_to: Option<String>,
305 session_id: String,
306 created_at: String,
307 finished_at: Option<String>,
308}
309
310#[derive(Deserialize)]
311struct Charged {
312 cost_micros: Option<i64>,
313 description: String,
314 amount_micros: i64,
315}
316
317/// What a settled run's correction comes to, from the charges at the
318/// reported and the gateway's cost and what the workspace was charged at
319/// first. A charge up is drawn down like any charge; a charge down is
320/// given back only up to what the workspace paid, since what a credit or
321/// a pool paid was never the workspace's money.
322pub(crate) fn correction(reported_charge: i64, gateway_charge: i64, first_charged: i64) -> i64 {
323 let delta = gateway_charge - reported_charge;
324 if delta >= 0 { delta } else { delta.max(-first_charged.max(0)) }
325}
326
327fn ms(timestamp: &str) -> u64 {
328 // RFC 3339 in UTC, as g1t writes them.
329 worker::js_sys::Date::parse(timestamp) as u64
330}
331
332impl Billing {
333 pub(crate) async fn prices(&self) -> Result<PriceBook> {
334 let prices = self
335 .db
336 .prepare("SELECT * FROM prices ORDER BY rowid")
337 .all()
338 .await?
339 .results::<PriceRow>()?;
340 let changes = self
341 .db
342 .prepare("SELECT * FROM price_changes ORDER BY created_at DESC LIMIT 20")
343 .all()
344 .await?
345 .results::<ChangeRow>()?;
346 Ok(PriceBook {
347 prices: prices
348 .into_iter()
349 .map(|row| Price {
350 price_micros: Price::price_for(row.cost_micros, row.markup_percent),
351 meter: row.meter,
352 title: row.title,
353 unit: row.unit,
354 cost_micros: row.cost_micros,
355 markup_percent: row.markup_percent,
356 source: row.source,
357 checked_at: row.checked_at,
358 updated_at: row.updated_at,
359 })
360 .collect(),
361 changes: changes
362 .into_iter()
363 .map(|row| PriceChange {
364 meter: row.meter,
365 old_cost_micros: row.old_cost_micros,
366 new_cost_micros: row.new_cost_micros,
367 markup_percent: row.markup_percent,
368 old_markup_percent: row.old_markup_percent,
369 reason: row.reason,
370 created_at: row.created_at,
371 })
372 .collect(),
373 model_margin_percent: self.margin_percent,
374 plans: g1t_contracts::billing::Feature::ALL.iter().map(|feature| self.plan(*feature)).collect(),
375 free: Some(g1t_contracts::billing::FreeTier {
376 trial_workspace_micros: if self.trials_on { self.plans.trial_workspace_micros } else { 0 },
377 trial_monthly_pool_micros: if self.trials_on { self.plans.trial_monthly_pool_micros } else { 0 },
378 oss_pool_micros: self.plans.oss_pool_micros,
379 oss_repo_micros: self.plans.oss_repo_micros,
380 free_private_storage_bytes: self.plans.free_storage_bytes,
381 audit_retention_days: self.plans.audit_days,
382 min_charge_micros: self.plans.min_charge_micros,
383 git_operations_included: self.plans.git_included,
384 git_operations_free_cap: self.plans.git_free_cap,
385 plan_private_storage_bytes: self.plans.plan_storage_bytes,
386 paid_start_ceiling_micros: self.plans.paid_start_micros,
387 overage_forgive_cost_micros: self.plans.forgive_cost_micros,
388 }),
389 })
390 }
391
392 /// Whether the costs have never been checked against Cloudflare's bill.
393 pub(crate) async fn never_checked(&self) -> Result<bool> {
394 Ok(self
395 .db
396 .prepare("SELECT meter FROM prices WHERE checked_at IS NOT NULL LIMIT 1")
397 .first::<Value>(None)
398 .await?
399 .is_none())
400 }
401
402 /// A meter's cost and price per unit, from the book.
403 pub(crate) async fn price(&self, meter: &str) -> Result<Option<(f64, f64)>> {
404 #[derive(Deserialize)]
405 struct Row {
406 cost_micros: f64,
407 markup_percent: u32,
408 }
409 Ok(self
410 .db
411 .prepare("SELECT cost_micros, markup_percent FROM prices WHERE meter = ?")
412 .bind(&[meter.into()])?
413 .first::<Row>(None)
414 .await?
415 .map(|row| (row.cost_micros, Price::price_for(row.cost_micros, row.markup_percent))))
416 }
417
418 /// Corrects finished runs to what AI Gateway priced them at, and
419 /// charges runs whose sandbox died before reporting.
420 pub(crate) async fn settle_runs(&self, keeper: &Keeper) -> Result<()> {
421 if keeper.token.is_none() || keeper.gateway.is_empty() {
422 return Ok(());
423 }
424 let now = now_ms();
425 let runs = self
426 .db
427 .prepare(
428 "SELECT id, workspace, repo, number, task, model, token_hash, billed_to, session_id, created_at, finished_at
429 FROM runs
430 WHERE session_id IS NOT NULL AND settled_at IS NULL
431 AND ((finished_at IS NOT NULL AND finished_at < ?1) OR created_at < ?2)
432 ORDER BY created_at LIMIT 10",
433 )
434 .bind(&[rfc3339(now - SETTLE_AFTER_MS).into(), rfc3339(now - ABANDONED_AFTER_MS).into()])?
435 .all()
436 .await?
437 .results::<Unsettled>()?;
438 for run in runs {
439 let (cost_usd, requests) = match keeper.session_cost(&run.session_id).await {
440 Ok(found) => found,
441 Err(error) => {
442 worker::console_error!("could not read gateway logs for {}: {error}", run.id);
443 continue;
444 }
445 };
446 let since = ms(run.finished_at.as_deref().unwrap_or(&run.created_at));
447 if requests == 0 && now.saturating_sub(since) < GIVE_UP_AFTER_MS {
448 continue;
449 }
450 self.settle(&run, cost_usd, requests).await?;
451 }
452 Ok(())
453 }
454
455 async fn settle(&self, run: &Unsettled, cost_usd: f64, requests: u32) -> Result<()> {
456 let row = RunRow {
457 workspace: run.workspace.clone(),
458 repo: run.repo.clone(),
459 number: run.number,
460 task: run.task.clone(),
461 model: run.model.clone(),
462 token_hash: run.token_hash.clone(),
463 billed_to: run.billed_to.clone(),
464 };
465 let gateway_micros = charge_micros(cost_usd, 0);
466 let charged = self
467 .db
468 .prepare("SELECT cost_micros, description, amount_micros FROM ledger WHERE reference = ?")
469 .bind(&[run.id.as_str().into()])?
470 .first::<Charged>(None)
471 .await?;
472 let terms = self.terms_of(&run.workspace).await?;
473 let charge_for = |micros: i64| {
474 if self.free {
475 0
476 } else {
477 terms.apply(charge_micros(micros as f64 / MICROS_PER_DOLLAR as f64, self.margin_percent))
478 }
479 };
480 let settled_at = rfc3339(now_ms());
481 // Claim it, so two crons never settle it twice.
482 let claimed = self
483 .db
484 .prepare("UPDATE runs SET settled_at = ?, gateway_cost_micros = ?, finished_at = COALESCE(finished_at, ?) WHERE id = ? AND settled_at IS NULL RETURNING id")
485 .bind(&[
486 settled_at.as_str().into(),
487 (gateway_micros as f64).into(),
488 settled_at.as_str().into(),
489 run.id.as_str().into(),
490 ])?
491 .first::<Value>(None)
492 .await?;
493 if claimed.is_none() || requests == 0 {
494 return Ok(());
495 }
496 let free_note = if self.free { " (free while g1t is being built out)" } else { "" };
497 match charged {
498 // Never reported: charged now, from the gateway's figure.
499 None => {
500 let charge = charge_for(gateway_micros);
501 let eligible = crate::credits::eligible_for(Some(g1t_contracts::billing::ComputeKind::Agent), None);
502 let drawn = self.draw(&run.workspace, charge, &settled_at[..7], &eligible).await?;
503 let description = format!(
504 "Work on {}#{}, settled from AI Gateway after the sandbox stopped without reporting{free_note}{}",
505 run.repo,
506 run.number,
507 drawn.note()
508 );
509 self.enter(&run.workspace, EntryKind::Usage, -(charge - drawn.total()), &description, &run.id, Some(&row), Some(gateway_micros), None, None)
510 .await?;
511 self.record_drawn(&run.id, &drawn).await?;
512 }
513 Some(charged) => {
514 let reported = charged.cost_micros.unwrap_or(0);
515 let delta = gateway_micros - reported;
516 if delta == 0 {
517 return Ok(());
518 }
519 let change = correction(charge_for(reported), charge_for(gateway_micros), -charged.amount_micros);
520 // A charge up is paid for like any other charge.
521 let drawn = if change > 0 {
522 let eligible = crate::credits::eligible_for(Some(g1t_contracts::billing::ComputeKind::Agent), None);
523 self.draw(&run.workspace, change, &settled_at[..7], &eligible).await?
524 } else {
525 crate::credits::Drawn::default()
526 };
527 let description = format!(
528 "Correction to “{}”: AI Gateway priced its {requests} model requests at {}, not {}{}",
529 charged.description,
530 crate::features::dollars(gateway_micros),
531 crate::features::dollars(reported),
532 drawn.note(),
533 );
534 let reference = format!("{}/settled", run.id);
535 self.enter(
536 &run.workspace,
537 EntryKind::Usage,
538 -(change - drawn.total()),
539 &description,
540 &reference,
541 Some(&row),
542 Some(delta),
543 None,
544 None,
545 )
546 .await?;
547 self.record_drawn(&reference, &drawn).await?;
548 }
549 }
550 Ok(())
551 }
552
553 /// Checks each cost against what Cloudflare billed this month, and
554 /// moves the ones that changed.
555 pub(crate) async fn reconcile(&self, keeper: &Keeper) -> Result<()> {
556 if keeper.token.is_none() {
557 return Ok(());
558 }
559 let now = rfc3339(now_ms());
560 let today = &now[..10];
561 let since = rfc3339(now_ms() - 30 * 24 * 60 * 60 * 1000);
562 let rows = keeper.billable_usage(&since[..10], today).await?;
563 for row in &rows {
564 self.db
565 .prepare(
566 "INSERT INTO cloudflare_usage (period_start, period_end, service, unit, quantity, cost_usd, fetched_at)
567 VALUES (?1, ?2, ?3, ?4, ?5, ?6, ?7)
568 ON CONFLICT (period_start, service, unit) DO UPDATE SET
569 period_end = ?2, quantity = ?5, cost_usd = ?6, fetched_at = ?7",
570 )
571 .bind(&[
572 row.period_start.as_str().into(),
573 row.period_end.as_str().into(),
574 row.service.as_str().into(),
575 row.unit.as_str().into(),
576 row.quantity.into(),
577 row.cost.into(),
578 now.as_str().into(),
579 ])?
580 .run()
581 .await?;
582 }
583
584 let named = |words: &[&str]| -> Vec<&UsageRow> {
585 rows.iter()
586 .filter(|r| {
587 let service = r.service.to_lowercase();
588 words.iter().all(|word| service.contains(word))
589 })
590 .collect()
591 };
592
593 // Containers: each resource at what the bill shows it costs, or
594 // the published rate while the included amount still covers it,
595 // over how much CPU g1t's sandboxes really use per second.
596 let memory = billed_rate(&named(&["container memory"]));
597 let disk = billed_rate(&named(&["container disk"]));
598 let vcpu = billed_rate(&named(&["container vcpu"]));
599 let durable_object = billed_rate(&named(&["durable objects", "duration"]));
600 let usage = keeper.container_usage(&since[..10], today).await?;
601 let rates = (
602 memory.unwrap_or(LIST_MEMORY_GIB_SECOND),
603 disk.unwrap_or(LIST_DISK_GB_SECOND),
604 vcpu.unwrap_or(LIST_VCPU_SECOND),
605 durable_object.unwrap_or(LIST_DO_GB_SECOND),
606 );
607 // The parts, for runs that report their own CPU.
608 let parts_reason = "Cloudflare's Containers and Durable Objects rates, as billed or published";
609 self.measure("sandbox_base_second", sandbox_base_micros(rates.0, rates.1, rates.3), parts_reason).await?;
610 self.measure("sandbox_cpu_second", rates.2 * MICROS_PER_DOLLAR as f64, parts_reason).await?;
611 if let Some(per_second) = sandbox_second_micros(usage, rates.0, rates.1, rates.2, rates.3) {
612 let instance_seconds = usage.memory_byte_seconds / (SANDBOX_GIB * GIB);
613 let billed = [("memory", memory), ("disk", disk), ("vCPU", vcpu), ("Durable Object duration", durable_object)]
614 .iter()
615 .filter(|(_, rate)| rate.is_some())
616 .map(|(name, _)| *name)
617 .collect::<Vec<_>>();
618 let reason = format!(
619 "Sandboxes used {:.2} vCPU per second over {:.0} hours of Cloudflare Containers in the last 30 days, with the Durable Object behind each; {}",
620 usage.cpu_seconds / instance_seconds,
621 instance_seconds / 3600.0,
622 if billed.is_empty() {
623 "rates are Cloudflare's published ones".to_owned()
624 } else {
625 format!("{} at what Cloudflare billed", billed.join(", "))
626 },
627 );
628 for meter in ["sandbox_second", "build_second"] {
629 self.measure(meter, per_second, &reason).await?;
630 }
631 }
632 // Apps run as Workers: per million requests and CPU milliseconds,
633 // once the bill shows them charged.
634 // Security scans' CPU follows the same Workers CPU rate.
635 let app_meters: [(&str, &[&str], &str); 3] = [
636 ("app_requests", &["workers", "requests"], "requests"),
637 ("app_cpu", &["workers cpu"], "CPU ms"),
638 ("scan_cpu", &["workers cpu"], "CPU ms"),
639 ];
640 for (meter, words, unit) in app_meters {
641 if let Some(rate) = billed_rate(&named(words)) {
642 let reason = format!("Cloudflare billed Workers {unit} at ${:.2} per million", rate * 1e6);
643 self.measure(meter, rate * 1e6 * MICROS_PER_DOLLAR as f64, &reason).await?;
644 }
645 }
646 self.db
647 .prepare("UPDATE prices SET checked_at = ?")
648 .bind(&[now.as_str().into()])?
649 .run()
650 .await?;
651 Ok(())
652 }
653
654 /// Moves a meter's cost to a measurement, if it is sound and different.
655 async fn measure(&self, meter: &str, measured: f64, reason: &str) -> Result<()> {
656 let Some((current, _)) = self.price(meter).await? else {
657 return Ok(());
658 };
659 match adopt(current, measured) {
660 Err(why) => worker::console_log!("{meter}: {why}"),
661 Ok(None) => {}
662 Ok(Some(cost)) => {
663 let now = now_ms();
664 self.db
665 .batch(vec![
666 self.db
667 .prepare("UPDATE prices SET cost_micros = ?, source = 'cloudflare', updated_at = ? WHERE meter = ?")
668 .bind(&[cost.into(), rfc3339(now).into(), meter.into()])?,
669 self.db
670 .prepare(
671 "INSERT INTO price_changes (id, meter, old_cost_micros, new_cost_micros, markup_percent, reason, created_at)
672 SELECT ?, meter, ?, ?, markup_percent, ?, ? FROM prices WHERE meter = ?",
673 )
674 .bind(&[
675 new_id("prc", now).into(),
676 current.into(),
677 cost.into(),
678 reason.into(),
679 rfc3339(now).into(),
680 meter.into(),
681 ])?,
682 ])
683 .await?;
684 }
685 }
686 Ok(())
687 }
688}
689
690#[cfg(test)]
691mod tests {
692 use super::*;
693
694 #[test]
695 fn a_correction_never_gives_back_what_the_workspace_did_not_pay() {
696 // Up by 2 cents: charged in full (then drawn down like any charge).
697 assert_eq!(correction(100_000, 120_000, 100_000), 20_000);
698 // Down by 2 cents, all of it paid by the workspace: given back.
699 assert_eq!(correction(120_000, 100_000, 120_000), -20_000);
700 // Down, but the open-source pool paid all but a cent: a cent back.
701 assert_eq!(correction(120_000, 100_000, 10_000), -10_000);
702 // Paid entirely by a credit or pool: nothing back.
703 assert_eq!(correction(120_000, 100_000, 0), 0);
704 }
705
706 #[test]
707 fn small_moves_are_noise_and_wild_ones_are_not_believed() {
708 assert_eq!(adopt(21.0, 21.2), Ok(None));
709 assert_eq!(adopt(21.0, 25.0), Ok(Some(25.0)));
710 assert_eq!(adopt(21.0, 15.0), Ok(Some(15.0)));
711 assert!(adopt(21.0, 200.0).is_err());
712 assert!(adopt(21.0, 0.0).is_err());
713 }
714
715 #[test]
716 fn a_sandbox_second_is_its_memory_and_disk_and_the_cpu_it_uses() {
717 // An hour of sandboxes that kept a fifth of a vCPU busy.
718 let usage = ContainerUsage { cpu_seconds: 720.0, memory_byte_seconds: 3600.0 * 4.0 * GIB };
719 let micros =
720 sandbox_second_micros(usage, LIST_MEMORY_GIB_SECOND, LIST_DISK_GB_SECOND, LIST_VCPU_SECOND, LIST_DO_GB_SECOND).unwrap();
721 // 4 x 2.5 + 8 x 0.07 + 0.125 x 12.5 + 0.2 x 20 = 16.1225
722 assert!((micros - 16.1225).abs() < 1e-9, "{micros}");
723 // The Durable Object adds about 11% to the second it left out.
724 assert!((sandbox_base_micros(LIST_MEMORY_GIB_SECOND, LIST_DISK_GB_SECOND, LIST_DO_GB_SECOND) - 12.1225).abs() < 1e-9);
725 // Too little use to say anything.
726 assert!(sandbox_second_micros(ContainerUsage { cpu_seconds: 1.0, memory_byte_seconds: GIB }, 1.0, 1.0, 1.0, 1.0).is_none());
727 }
728
729 #[test]
730 fn a_run_that_reports_its_cpu_is_priced_on_it() {
731 let base = sandbox_base_micros(LIST_MEMORY_GIB_SECOND, LIST_DISK_GB_SECOND, LIST_DO_GB_SECOND);
732 let vcpu = LIST_VCPU_SECOND * MICROS_PER_DOLLAR as f64;
733 // A 10-minute cargo build that kept its half vCPU busy throughout.
734 let heavy = run_cost(600, 300.0, base, vcpu);
735 assert!((heavy - (600.0 * 12.1225 + 300.0 * 20.0)).abs() < 1e-6);
736 // The same ten minutes, mostly idle, costs less.
737 let light = run_cost(600, 30.0, base, vcpu);
738 assert!(light < heavy);
739 // The average would have under-priced the heavy one.
740 let average = 600.0 * (base + 0.195 * vcpu);
741 assert!(average < heavy && average > light);
742 assert_eq!(run_cost(0, -1.0, base, vcpu), 0.0);
743 }
744
745 #[test]
746 fn a_billed_rate_is_the_median_of_the_charged_days() {
747 let row = |quantity: f64, cost: f64| UsageRow {
748 period_start: String::new(),
749 period_end: String::new(),
750 service: "Containers / Container Memory".into(),
751 unit: "Count".into(),
752 quantity,
753 cost,
754 };
755 let rows = [row(100.0, 0.0), row(100.0, 0.0002), row(100.0, 0.00025), row(100.0, 0.00025)];
756 assert_eq!(billed_rate(&rows.iter().collect::<Vec<_>>()), Some(0.000_002_5));
757 assert_eq!(billed_rate(&[&row(5.0, 0.0)]), None);
758 }
759
760 #[test]
761 fn usage_rows_are_read_by_their_focus_names() {
762 let row = UsageRow::from_value(&json!({
763 "ServiceFamilyName": "Containers",
764 "ServiceName": "Memory",
765 "PricingUnit": "GiB-seconds",
766 "PricingQuantity": "1200.5",
767 "ContractedCost": 0.003,
768 "ChargePeriodStart": "2026-10-01",
769 }))
770 .unwrap();
771 assert_eq!(row.service, "Containers / Memory");
772 assert_eq!(row.quantity, 1200.5);
773 assert_eq!(row.cost, 0.003);
774 assert!(UsageRow::from_value(&json!({ "nothing": 1 })).is_none());
775 }
776}