Pick any line to see why it is the way it is: the commit, the pull request and issue it came from, and what the agent was thinking.
| Deploys as code: a manifest of every Worker, a deploy tool that ships only what changed in parallel stages, and a g1t Actions workflow | 1 | // What a deploy would do: for each unit, the commit it runs, what changed |
| 2 | // since, and its pending migrations. Git and Wrangler are passed in, so the | |
| 3 | // tests can give their own. | |
| 4 | ||
| 5 | import { execFileSync } from "node:child_process"; | |
| 6 | ||
| 7 | import { changedNames, lockRoots, parseCargoLock, parseNpmLock, reaches } from "./lockfiles.mjs"; | |
| 8 | import { ROOT, byStage, buildGroups, codeStages, touches, touchesImage } from "./stack.mjs"; | |
| 9 | ||
| 10 | /** Git, read-only. */ | |
| 11 | export const git = { | |
| 12 | head: () => run(["rev-parse", "HEAD"]).trim(), | |
| 13 | resolve: (rev) => run(["rev-parse", "--verify", `${rev}^{commit}`]).trim(), | |
| 14 | subject: () => run(["log", "-1", "--format=%s"]).trim(), | |
| 15 | /** Whether a commit is in this checkout's history. */ | |
| 16 | has: (sha) => { | |
| 17 | try { | |
| 18 | run(["cat-file", "-e", `${sha}^{commit}`]); | |
| 19 | return true; | |
| 20 | } catch { | |
| 21 | return false; | |
| 22 | } | |
| 23 | }, | |
| 24 | /** Files changed between two commits. */ | |
| 25 | /** A file's text at a commit, or "" if it is not there. */ | |
| 26 | show: (sha, path) => { | |
| 27 | try { | |
| 28 | return run(["show", `${sha}:${path}`]); | |
| 29 | } catch { | |
| 30 | return ""; | |
| 31 | } | |
| 32 | }, | |
| 33 | changed: (from, to) => run(["diff", "--name-only", "--no-renames", from, to]).split("\n").filter(Boolean), | |
| 34 | /** Uncommitted and untracked files (not ignored ones). */ | |
| 35 | dirty: () => | |
| 36 | run(["status", "--porcelain", "--untracked-files=all"]) | |
| 37 | .split("\n") | |
| 38 | .filter(Boolean) | |
| 39 | .map((line) => line.slice(3).replace(/^"|"$/g, "").split(" -> ").pop()), | |
| 40 | }; | |
| 41 | ||
| 42 | function run(args) { | |
| 43 | return execFileSync("git", args, { cwd: ROOT, encoding: "utf8", maxBuffer: 256 * 1024 * 1024, stdio: ["ignore", "pipe", "pipe"] }); | |
| 44 | } | |
| 45 | ||
| 46 | /** | |
| 47 | * Decides, for each unit in `units`, whether it deploys and why. | |
| 48 | * | |
| 49 | * live: unit id -> { sha, why? } (what readLive found) | |
| 50 | * head: the commit being deployed | |
| 51 | * force: deploy even what has not changed | |
| 52 | * gitApi: { has, changed } | |
| 53 | * | |
| 54 | * Each unit gets { deploy, reason, since, files, image }: `files` are the | |
| 55 | * changed files that touch it; `image` says whether its Containers image | |
| 56 | * must be built. | |
| 57 | */ | |
| 58 | export function decide(units, { live, head, force = false, gitApi = git }) { | |
| 59 | const diffs = new Map(); | |
| 60 | const changedSince = (sha) => { | |
| 61 | if (!diffs.has(sha)) diffs.set(sha, gitApi.changed(sha, head)); | |
| 62 | return diffs.get(sha); | |
| 63 | }; | |
| 64 | // A lockfile change counts for a unit only if a package it uses changed. | |
| 65 | const locks = new Map(); | |
| 66 | const lockChange = (sha, file) => { | |
| 67 | const key = `${sha}:${file}`; | |
| 68 | if (!locks.has(key)) { | |
| 69 | const parse = file === "Cargo.lock" ? parseCargoLock : parseNpmLock; | |
| 70 | const after = parse(gitApi.show(head, file)); | |
| 71 | locks.set(key, { after, names: changedNames(parse(gitApi.show(sha, file)), after) }); | |
| 72 | } | |
| 73 | return locks.get(key); | |
| 74 | }; | |
| 75 | const relevant = (unit, sha, files) => | |
| 76 | files.filter((file) => { | |
| 77 | if (file !== "Cargo.lock" && file !== "package-lock.json") return true; | |
| 78 | const { after, names } = lockChange(sha, file); | |
| 79 | const roots = lockRoots(unit)[file === "Cargo.lock" ? "cargo" : "npm"]; | |
| 80 | return reaches(after, roots, names); | |
| 81 | }); | |
| 82 | return units.map((unit) => { | |
| 83 | const found = live[unit.id] ?? { sha: null, why: "not read" }; | |
| 84 | const decision = { unit, since: found.sha, deploy: false, reason: "", files: [], image: false }; | |
| 85 | if (!found.sha) { | |
| 86 | decision.deploy = true; | |
| 87 | decision.reason = found.error ? `could not read what it runs: ${firstLine(found.error)}` : `no known commit (${found.why ?? "unknown"})`; | |
| 88 | decision.image = Boolean(unit.image); | |
| 89 | return decision; | |
| 90 | } | |
| 91 | if (found.sha === head) { | |
| 92 | decision.deploy = force; | |
| 93 | decision.reason = force ? "forced; already at this commit" : "up to date"; | |
| 94 | return decision; | |
| 95 | } | |
| 96 | if (!gitApi.has(found.sha)) { | |
| 97 | decision.deploy = true; | |
| 98 | decision.reason = `runs ${found.sha.slice(0, 12)}, which this checkout does not have (fetch full history)`; | |
| 99 | decision.image = Boolean(unit.image); | |
| 100 | return decision; | |
| 101 | } | |
| 102 | const files = relevant(unit, found.sha, changedSince(found.sha)); | |
| 103 | const hit = touches(unit, files); | |
| 104 | decision.files = hit ? files.filter((file) => touches(unit, [file])) : []; | |
| 105 | decision.image = touchesImage(unit, files); | |
| 106 | if (hit) { | |
| 107 | decision.deploy = true; | |
| 108 | decision.reason = `${decision.files.length} changed file${decision.files.length === 1 ? "" : "s"} (${hit.file}${hit.via === "its own folder" ? "" : ` via ${hit.via}`})`; | |
| 109 | } else { | |
| 110 | decision.deploy = force; | |
| 111 | decision.reason = force ? "forced; nothing it is built from changed" : "nothing it is built from changed"; | |
| 112 | } | |
| 113 | return decision; | |
| 114 | }); | |
| 115 | } | |
| 116 | ||
| 117 | const firstLine = (text) => String(text).trim().split("\n").find((line) => /error|\[ERROR\]|X /i.test(line)) ?? String(text).trim().split("\n")[0]; | |
| 118 | ||
| 119 | /** | |
| 120 | * The plan as data, for `plan --json` and the workflow: the migrations to | |
| 121 | * apply, and each stage's units split into the jobs that build them. | |
| 122 | */ | |
| 123 | export function planJson(stack, decisions, migrations, head) { | |
| 124 | const deploying = decisions.filter((d) => d.deploy).map((d) => d.unit); | |
| 125 | const stages = {}; | |
| 126 | for (const stage of codeStages(stack)) { | |
| 127 | const units = deploying.filter((u) => u.stage === stage); | |
| 128 | stages[stage] = { units: units.map((u) => u.id), jobs: buildGroups(units, decisions.filter((d) => d.deploy && d.image).map((d) => d.unit.id)) }; | |
| 129 | } | |
| 130 | return { | |
| 131 | commit: head, | |
| 132 | migrations: Object.entries(migrations) | |
| 133 | .filter(([, m]) => m.pending?.length) | |
| 134 | .map(([id, m]) => ({ unit: id, database: stack.units.find((u) => u.id === id).d1.database, pending: m.pending })), | |
| 135 | migration_errors: Object.entries(migrations) | |
| 136 | .filter(([, m]) => m.error) | |
| 137 | .map(([id, m]) => ({ unit: id, error: m.error })), | |
| 138 | stages, | |
| 139 | units: decisions.map((d) => ({ | |
| 140 | unit: d.unit.id, | |
| 141 | stage: d.unit.stage, | |
| 142 | deploy: d.deploy, | |
| 143 | reason: d.reason, | |
| 144 | live_commit: d.since, | |
| 145 | image: d.image, | |
| 146 | })), | |
| 147 | stage_order: byStage(stack, deploying).map((g) => g.stage), | |
| 148 | }; | |
| 149 | } | |
| 150 | ||
| 151 | /** A plain table. */ | |
| 152 | export function table(rows, headers) { | |
| 153 | const widths = headers.map((h, i) => Math.max(h.length, ...rows.map((r) => String(r[i] ?? "").length))); | |
| 154 | const line = (cells) => cells.map((c, i) => String(c ?? "").padEnd(widths[i])).join(" ").trimEnd(); | |
| 155 | return [line(headers), line(widths.map((w) => "-".repeat(w))), ...rows.map(line)].join("\n"); | |
| 156 | } | |
| 157 | ||
| 158 | /** Runs `task` over `items`, at most `limit` at once, in order of start. */ | |
| 159 | export async function pool(items, limit, task) { | |
| 160 | const results = new Array(items.length); | |
| 161 | let next = 0; | |
| 162 | const workers = Array.from({ length: Math.max(1, Math.min(limit, items.length)) }, async () => { | |
| 163 | while (next < items.length) { | |
| 164 | const index = next++; | |
| 165 | results[index] = await task(items[index], index); | |
| 166 | } | |
| 167 | }); | |
| 168 | await Promise.all(workers); | |
| 169 | return results; | |
| 170 | } |