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flagon-io/g1t

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g1t/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 paid_start_ceiling_micros: self.plans.paid_start_micros,
385 overage_forgive_cost_micros: self.plans.forgive_cost_micros,
386 }),
387 })
388 }
389
390 /// Whether the costs have never been checked against Cloudflare's bill.
391 pub(crate) async fn never_checked(&self) -> Result<bool> {
392 Ok(self
393 .db
394 .prepare("SELECT meter FROM prices WHERE checked_at IS NOT NULL LIMIT 1")
395 .first::<Value>(None)
396 .await?
397 .is_none())
398 }
399
400 /// A meter's cost and price per unit, from the book.
401 pub(crate) async fn price(&self, meter: &str) -> Result<Option<(f64, f64)>> {
402 #[derive(Deserialize)]
403 struct Row {
404 cost_micros: f64,
405 markup_percent: u32,
406 }
407 Ok(self
408 .db
409 .prepare("SELECT cost_micros, markup_percent FROM prices WHERE meter = ?")
410 .bind(&[meter.into()])?
411 .first::<Row>(None)
412 .await?
413 .map(|row| (row.cost_micros, Price::price_for(row.cost_micros, row.markup_percent))))
414 }
415
416 /// Corrects finished runs to what AI Gateway priced them at, and
417 /// charges runs whose sandbox died before reporting.
418 pub(crate) async fn settle_runs(&self, keeper: &Keeper) -> Result<()> {
419 if keeper.token.is_none() || keeper.gateway.is_empty() {
420 return Ok(());
421 }
422 let now = now_ms();
423 let runs = self
424 .db
425 .prepare(
426 "SELECT id, workspace, repo, number, task, model, token_hash, billed_to, session_id, created_at, finished_at
427 FROM runs
428 WHERE session_id IS NOT NULL AND settled_at IS NULL
429 AND ((finished_at IS NOT NULL AND finished_at < ?1) OR created_at < ?2)
430 ORDER BY created_at LIMIT 10",
431 )
432 .bind(&[rfc3339(now - SETTLE_AFTER_MS).into(), rfc3339(now - ABANDONED_AFTER_MS).into()])?
433 .all()
434 .await?
435 .results::<Unsettled>()?;
436 for run in runs {
437 let (cost_usd, requests) = match keeper.session_cost(&run.session_id).await {
438 Ok(found) => found,
439 Err(error) => {
440 worker::console_error!("could not read gateway logs for {}: {error}", run.id);
441 continue;
442 }
443 };
444 let since = ms(run.finished_at.as_deref().unwrap_or(&run.created_at));
445 if requests == 0 && now.saturating_sub(since) < GIVE_UP_AFTER_MS {
446 continue;
447 }
448 self.settle(&run, cost_usd, requests).await?;
449 }
450 Ok(())
451 }
452
453 async fn settle(&self, run: &Unsettled, cost_usd: f64, requests: u32) -> Result<()> {
454 let row = RunRow {
455 workspace: run.workspace.clone(),
456 repo: run.repo.clone(),
457 number: run.number,
458 task: run.task.clone(),
459 model: run.model.clone(),
460 token_hash: run.token_hash.clone(),
461 billed_to: run.billed_to.clone(),
462 };
463 let gateway_micros = charge_micros(cost_usd, 0);
464 let charged = self
465 .db
466 .prepare("SELECT cost_micros, description, amount_micros FROM ledger WHERE reference = ?")
467 .bind(&[run.id.as_str().into()])?
468 .first::<Charged>(None)
469 .await?;
470 let terms = self.terms_of(&run.workspace).await?;
471 let charge_for = |micros: i64| {
472 if self.free {
473 0
474 } else {
475 terms.apply(charge_micros(micros as f64 / MICROS_PER_DOLLAR as f64, self.margin_percent))
476 }
477 };
478 let settled_at = rfc3339(now_ms());
479 // Claim it, so two crons never settle it twice.
480 let claimed = self
481 .db
482 .prepare("UPDATE runs SET settled_at = ?, gateway_cost_micros = ?, finished_at = COALESCE(finished_at, ?) WHERE id = ? AND settled_at IS NULL RETURNING id")
483 .bind(&[
484 settled_at.as_str().into(),
485 (gateway_micros as f64).into(),
486 settled_at.as_str().into(),
487 run.id.as_str().into(),
488 ])?
489 .first::<Value>(None)
490 .await?;
491 if claimed.is_none() || requests == 0 {
492 return Ok(());
493 }
494 let free_note = if self.free { " (free while g1t is being built out)" } else { "" };
495 match charged {
496 // Never reported: charged now, from the gateway's figure.
497 None => {
498 let charge = charge_for(gateway_micros);
499 let eligible = crate::credits::eligible_for(Some(g1t_contracts::billing::ComputeKind::Agent), None);
500 let drawn = self.draw(&run.workspace, charge, &settled_at[..7], &eligible).await?;
501 let description = format!(
502 "Work on {}#{}, settled from AI Gateway after the sandbox stopped without reporting{free_note}{}",
503 run.repo,
504 run.number,
505 drawn.note()
506 );
507 self.enter(&run.workspace, EntryKind::Usage, -(charge - drawn.total()), &description, &run.id, Some(&row), Some(gateway_micros), None, None)
508 .await?;
509 self.record_drawn(&run.id, &drawn).await?;
510 }
511 Some(charged) => {
512 let reported = charged.cost_micros.unwrap_or(0);
513 let delta = gateway_micros - reported;
514 if delta == 0 {
515 return Ok(());
516 }
517 let change = correction(charge_for(reported), charge_for(gateway_micros), -charged.amount_micros);
518 // A charge up is paid for like any other charge.
519 let drawn = if change > 0 {
520 let eligible = crate::credits::eligible_for(Some(g1t_contracts::billing::ComputeKind::Agent), None);
521 self.draw(&run.workspace, change, &settled_at[..7], &eligible).await?
522 } else {
523 crate::credits::Drawn::default()
524 };
525 let description = format!(
526 "Correction to “{}”: AI Gateway priced its {requests} model requests at {}, not {}{}",
527 charged.description,
528 crate::features::dollars(gateway_micros),
529 crate::features::dollars(reported),
530 drawn.note(),
531 );
532 let reference = format!("{}/settled", run.id);
533 self.enter(
534 &run.workspace,
535 EntryKind::Usage,
536 -(change - drawn.total()),
537 &description,
538 &reference,
539 Some(&row),
540 Some(delta),
541 None,
542 None,
543 )
544 .await?;
545 self.record_drawn(&reference, &drawn).await?;
546 }
547 }
548 Ok(())
549 }
550
551 /// Checks each cost against what Cloudflare billed this month, and
552 /// moves the ones that changed.
553 pub(crate) async fn reconcile(&self, keeper: &Keeper) -> Result<()> {
554 if keeper.token.is_none() {
555 return Ok(());
556 }
557 let now = rfc3339(now_ms());
558 let today = &now[..10];
559 let since = rfc3339(now_ms() - 30 * 24 * 60 * 60 * 1000);
560 let rows = keeper.billable_usage(&since[..10], today).await?;
561 for row in &rows {
562 self.db
563 .prepare(
564 "INSERT INTO cloudflare_usage (period_start, period_end, service, unit, quantity, cost_usd, fetched_at)
565 VALUES (?1, ?2, ?3, ?4, ?5, ?6, ?7)
566 ON CONFLICT (period_start, service, unit) DO UPDATE SET
567 period_end = ?2, quantity = ?5, cost_usd = ?6, fetched_at = ?7",
568 )
569 .bind(&[
570 row.period_start.as_str().into(),
571 row.period_end.as_str().into(),
572 row.service.as_str().into(),
573 row.unit.as_str().into(),
574 row.quantity.into(),
575 row.cost.into(),
576 now.as_str().into(),
577 ])?
578 .run()
579 .await?;
580 }
581
582 let named = |words: &[&str]| -> Vec<&UsageRow> {
583 rows.iter()
584 .filter(|r| {
585 let service = r.service.to_lowercase();
586 words.iter().all(|word| service.contains(word))
587 })
588 .collect()
589 };
590
591 // Containers: each resource at what the bill shows it costs, or
592 // the published rate while the included amount still covers it,
593 // over how much CPU g1t's sandboxes really use per second.
594 let memory = billed_rate(&named(&["container memory"]));
595 let disk = billed_rate(&named(&["container disk"]));
596 let vcpu = billed_rate(&named(&["container vcpu"]));
597 let durable_object = billed_rate(&named(&["durable objects", "duration"]));
598 let usage = keeper.container_usage(&since[..10], today).await?;
599 let rates = (
600 memory.unwrap_or(LIST_MEMORY_GIB_SECOND),
601 disk.unwrap_or(LIST_DISK_GB_SECOND),
602 vcpu.unwrap_or(LIST_VCPU_SECOND),
603 durable_object.unwrap_or(LIST_DO_GB_SECOND),
604 );
605 // The parts, for runs that report their own CPU.
606 let parts_reason = "Cloudflare's Containers and Durable Objects rates, as billed or published";
607 self.measure("sandbox_base_second", sandbox_base_micros(rates.0, rates.1, rates.3), parts_reason).await?;
608 self.measure("sandbox_cpu_second", rates.2 * MICROS_PER_DOLLAR as f64, parts_reason).await?;
609 if let Some(per_second) = sandbox_second_micros(usage, rates.0, rates.1, rates.2, rates.3) {
610 let instance_seconds = usage.memory_byte_seconds / (SANDBOX_GIB * GIB);
611 let billed = [("memory", memory), ("disk", disk), ("vCPU", vcpu), ("Durable Object duration", durable_object)]
612 .iter()
613 .filter(|(_, rate)| rate.is_some())
614 .map(|(name, _)| *name)
615 .collect::<Vec<_>>();
616 let reason = format!(
617 "Sandboxes used {:.2} vCPU per second over {:.0} hours of Cloudflare Containers in the last 30 days, with the Durable Object behind each; {}",
618 usage.cpu_seconds / instance_seconds,
619 instance_seconds / 3600.0,
620 if billed.is_empty() {
621 "rates are Cloudflare's published ones".to_owned()
622 } else {
623 format!("{} at what Cloudflare billed", billed.join(", "))
624 },
625 );
626 for meter in ["sandbox_second", "build_second"] {
627 self.measure(meter, per_second, &reason).await?;
628 }
629 }
630 // Apps run as Workers: per million requests and CPU milliseconds,
631 // once the bill shows them charged.
632 // Security scans' CPU follows the same Workers CPU rate.
633 let app_meters: [(&str, &[&str], &str); 3] = [
634 ("app_requests", &["workers", "requests"], "requests"),
635 ("app_cpu", &["workers cpu"], "CPU ms"),
636 ("scan_cpu", &["workers cpu"], "CPU ms"),
637 ];
638 for (meter, words, unit) in app_meters {
639 if let Some(rate) = billed_rate(&named(words)) {
640 let reason = format!("Cloudflare billed Workers {unit} at ${:.2} per million", rate * 1e6);
641 self.measure(meter, rate * 1e6 * MICROS_PER_DOLLAR as f64, &reason).await?;
642 }
643 }
644 self.db
645 .prepare("UPDATE prices SET checked_at = ?")
646 .bind(&[now.as_str().into()])?
647 .run()
648 .await?;
649 Ok(())
650 }
651
652 /// Moves a meter's cost to a measurement, if it is sound and different.
653 async fn measure(&self, meter: &str, measured: f64, reason: &str) -> Result<()> {
654 let Some((current, _)) = self.price(meter).await? else {
655 return Ok(());
656 };
657 match adopt(current, measured) {
658 Err(why) => worker::console_log!("{meter}: {why}"),
659 Ok(None) => {}
660 Ok(Some(cost)) => {
661 let now = now_ms();
662 self.db
663 .batch(vec![
664 self.db
665 .prepare("UPDATE prices SET cost_micros = ?, source = 'cloudflare', updated_at = ? WHERE meter = ?")
666 .bind(&[cost.into(), rfc3339(now).into(), meter.into()])?,
667 self.db
668 .prepare(
669 "INSERT INTO price_changes (id, meter, old_cost_micros, new_cost_micros, markup_percent, reason, created_at)
670 SELECT ?, meter, ?, ?, markup_percent, ?, ? FROM prices WHERE meter = ?",
671 )
672 .bind(&[
673 new_id("prc", now).into(),
674 current.into(),
675 cost.into(),
676 reason.into(),
677 rfc3339(now).into(),
678 meter.into(),
679 ])?,
680 ])
681 .await?;
682 }
683 }
684 Ok(())
685 }
686}
687
688#[cfg(test)]
689mod tests {
690 use super::*;
691
692 #[test]
693 fn a_correction_never_gives_back_what_the_workspace_did_not_pay() {
694 // Up by 2 cents: charged in full (then drawn down like any charge).
695 assert_eq!(correction(100_000, 120_000, 100_000), 20_000);
696 // Down by 2 cents, all of it paid by the workspace: given back.
697 assert_eq!(correction(120_000, 100_000, 120_000), -20_000);
698 // Down, but the open-source pool paid all but a cent: a cent back.
699 assert_eq!(correction(120_000, 100_000, 10_000), -10_000);
700 // Paid entirely by a credit or pool: nothing back.
701 assert_eq!(correction(120_000, 100_000, 0), 0);
702 }
703
704 #[test]
705 fn small_moves_are_noise_and_wild_ones_are_not_believed() {
706 assert_eq!(adopt(21.0, 21.2), Ok(None));
707 assert_eq!(adopt(21.0, 25.0), Ok(Some(25.0)));
708 assert_eq!(adopt(21.0, 15.0), Ok(Some(15.0)));
709 assert!(adopt(21.0, 200.0).is_err());
710 assert!(adopt(21.0, 0.0).is_err());
711 }
712
713 #[test]
714 fn a_sandbox_second_is_its_memory_and_disk_and_the_cpu_it_uses() {
715 // An hour of sandboxes that kept a fifth of a vCPU busy.
716 let usage = ContainerUsage { cpu_seconds: 720.0, memory_byte_seconds: 3600.0 * 4.0 * GIB };
717 let micros =
718 sandbox_second_micros(usage, LIST_MEMORY_GIB_SECOND, LIST_DISK_GB_SECOND, LIST_VCPU_SECOND, LIST_DO_GB_SECOND).unwrap();
719 // 4 x 2.5 + 8 x 0.07 + 0.125 x 12.5 + 0.2 x 20 = 16.1225
720 assert!((micros - 16.1225).abs() < 1e-9, "{micros}");
721 // The Durable Object adds about 11% to the second it left out.
722 assert!((sandbox_base_micros(LIST_MEMORY_GIB_SECOND, LIST_DISK_GB_SECOND, LIST_DO_GB_SECOND) - 12.1225).abs() < 1e-9);
723 // Too little use to say anything.
724 assert!(sandbox_second_micros(ContainerUsage { cpu_seconds: 1.0, memory_byte_seconds: GIB }, 1.0, 1.0, 1.0, 1.0).is_none());
725 }
726
727 #[test]
728 fn a_run_that_reports_its_cpu_is_priced_on_it() {
729 let base = sandbox_base_micros(LIST_MEMORY_GIB_SECOND, LIST_DISK_GB_SECOND, LIST_DO_GB_SECOND);
730 let vcpu = LIST_VCPU_SECOND * MICROS_PER_DOLLAR as f64;
731 // A 10-minute cargo build that kept its half vCPU busy throughout.
732 let heavy = run_cost(600, 300.0, base, vcpu);
733 assert!((heavy - (600.0 * 12.1225 + 300.0 * 20.0)).abs() < 1e-6);
734 // The same ten minutes, mostly idle, costs less.
735 let light = run_cost(600, 30.0, base, vcpu);
736 assert!(light < heavy);
737 // The average would have under-priced the heavy one.
738 let average = 600.0 * (base + 0.195 * vcpu);
739 assert!(average < heavy && average > light);
740 assert_eq!(run_cost(0, -1.0, base, vcpu), 0.0);
741 }
742
743 #[test]
744 fn a_billed_rate_is_the_median_of_the_charged_days() {
745 let row = |quantity: f64, cost: f64| UsageRow {
746 period_start: String::new(),
747 period_end: String::new(),
748 service: "Containers / Container Memory".into(),
749 unit: "Count".into(),
750 quantity,
751 cost,
752 };
753 let rows = [row(100.0, 0.0), row(100.0, 0.0002), row(100.0, 0.00025), row(100.0, 0.00025)];
754 assert_eq!(billed_rate(&rows.iter().collect::<Vec<_>>()), Some(0.000_002_5));
755 assert_eq!(billed_rate(&[&row(5.0, 0.0)]), None);
756 }
757
758 #[test]
759 fn usage_rows_are_read_by_their_focus_names() {
760 let row = UsageRow::from_value(&json!({
761 "ServiceFamilyName": "Containers",
762 "ServiceName": "Memory",
763 "PricingUnit": "GiB-seconds",
764 "PricingQuantity": "1200.5",
765 "ContractedCost": 0.003,
766 "ChargePeriodStart": "2026-10-01",
767 }))
768 .unwrap();
769 assert_eq!(row.service, "Containers / Memory");
770 assert_eq!(row.quantity, 1200.5);
771 assert_eq!(row.cost, 0.003);
772 assert!(UsageRow::from_value(&json!({ "nothing": 1 })).is_none());
773 }
774}