refactor: 后端从 Django 换成 Bun + SQLite
Django 多个 worker 内存占用 1-2 GB，换成 Bun 单进程后约 25 MB， 同时去掉 Postgres 和 Redis，只剩 Caddy + Bun 两个容器。 - server/：Hono + bun:sqlite + Bun 原生 WebSocket，接口与原 django-ninja 保持兼容；表结构、时间/UUID 存储格式、密码哈希与 Django 一致，旧数据可直接使用 - 评分加权、贝叶斯平滑、成绩册的计算结果与原实现逐位一致（复刻 Python round/sum） - scripts/：Postgres → SQLite 迁移、新建超管、提示词层级标注、重算分数 - 前端：Django Admin 去掉后，用户新建/修改改为页面内弹窗； 非超管的挑战公开按钮置灰 - 权限不足返回 JSON 403（原来是重定向到不存在的登录页） - docker-compose / Caddyfile / dev.sh / CLAUDE.md 更新，删除 AGENTS.md - 服务器切换步骤见 docs/migrate-to-bun.md Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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import { all } from "../db"
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import { uuidOut } from "../db"
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import { HttpError } from "../http"
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import { pyRound, pySum } from "./pyround"
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export type GradebookTaskType = "tutorial" | "challenge"
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type Grade = "A" | "B" | "C" | "D" | "E"
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export interface GradebookFilters {
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classname: string
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task_type?: GradebookTaskType
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username?: string
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include_all_tasks?: boolean
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}
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interface GradebookTask {
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id: number
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display: number
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title: string
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task_type: string
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submitted_count: number
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coverage: number
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included: boolean
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}
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interface GradebookRow {
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user_id: number
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username: string
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classname: string
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rank: number
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grade: Grade
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assessment_grade: Grade
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assessment_score: number
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top3_score: number
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scores: Record<number, { score: number; submitted: boolean; submission_id: string | null }>
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tutorial_total: number
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challenge_total: number
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total_score: number
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average_score: number | null
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submitted_task_count: number
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missing_task_count: number
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}
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export interface Gradebook {
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classname: string
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classes: string[]
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task_count: number
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included_task_count: number
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student_count: number
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coverage_threshold_count: number
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tasks: GradebookTask[]
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rows: GradebookRow[]
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}
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const score = (value: number | null | undefined) => pyRound(value || 0, 2)
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// Python 字符串比较（按码点），不能用 localeCompare
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const cmp = (a: string, b: string) => (a < b ? -1 : a > b ? 1 : 0)
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function gradeForRank(rank: number, n: number): Grade {
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if (rank <= Math.ceil(0.3 * n)) return "A"
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if (rank <= Math.ceil(0.7 * n)) return "B"
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if (rank <= Math.ceil(0.9 * n)) return "C"
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if (rank <= Math.ceil(0.95 * n)) return "D"
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return "E"
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}
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// 考核等级：A10% B20% C40% D20% E10%，按最高三次提交均分排名
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function assessmentGradeForRank(rank: number, n: number): Grade {
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if (rank <= Math.ceil(0.1 * n)) return "A"
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if (rank <= Math.ceil(0.3 * n)) return "B"
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if (rank <= Math.ceil(0.7 * n)) return "C"
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if (rank <= Math.ceil(0.9 * n)) return "D"
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return "E"
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}
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// 考核分数：各等级对应的分数段（高分→低分），段内按名次线性铺开；最高分封顶 99
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const ASSESSMENT_SCORE_BANDS: Record<Grade, [number, number]> = {
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A: [92, 99],
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B: [84, 91],
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C: [76, 83],
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D: [68, 75],
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E: [60, 67],
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}
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function assessmentScore(indexInGrade: number, gradeSize: number, grade: Grade) {
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const [low, high] = ASSESSMENT_SCORE_BANDS[grade]
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if (gradeSize <= 1) return high
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// 段内第 1 名拿段顶，最后 1 名拿段底
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return pyRound(high - (indexInGrade / (gradeSize - 1)) * (high - low))
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}
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export function buildGradebook(filters: GradebookFilters): Gradebook {
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const classname = filters.classname?.trim() ?? ""
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if (!classname) throw new HttpError(400, "请选择班级")
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const classes = all<{ classname: string }>(
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`SELECT DISTINCT classname FROM account_user
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WHERE role IN ('normal', 'admin') AND classname != '' ORDER BY classname`,
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).map((r) => r.classname)
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const students = all<{ id: number; username: string; classname: string }>(
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`SELECT id, username, classname FROM account_user
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WHERE role IN ('normal', 'admin') AND classname = $classname
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ORDER BY username, id`,
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{ classname },
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)
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const studentCount = students.length
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const coverageThreshold = studentCount ? Math.ceil(studentCount * 0.5) : 0
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const typeFilter = filters.task_type ? `AND t.task_type = $task_type` : ""
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const typeParams = filters.task_type ? { task_type: filters.task_type } : {}
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const taskRows = all<{ id: number; display: number; title: string; task_type: string; submitted_count: number }>(
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`SELECT t.id, t.display, t.title, t.task_type, COUNT(DISTINCT s.user_id) AS submitted_count
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FROM submission_submission s
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JOIN task_task t ON t.id = s.task_id
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JOIN account_user u ON u.id = s.user_id
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WHERE u.role IN ('normal', 'admin') AND u.classname = $classname ${typeFilter}
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GROUP BY t.id`,
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{ classname, ...typeParams },
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)
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taskRows.sort(
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(a, b) =>
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(a.task_type === "tutorial" ? 0 : 1) - (b.task_type === "tutorial" ? 0 : 1) ||
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a.display - b.display ||
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a.id - b.id,
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)
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const allTasks: GradebookTask[] = taskRows.map((t) => ({
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id: t.id,
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display: t.display,
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title: t.title,
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task_type: t.task_type,
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submitted_count: t.submitted_count,
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coverage: studentCount ? score(t.submitted_count / studentCount) : 0,
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included: studentCount > 0 && t.submitted_count >= coverageThreshold,
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}))
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const tasks = allTasks.filter((t) => filters.include_all_tasks || t.included)
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const visibleTaskIds = new Set(tasks.map((t) => t.id))
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const includedTaskCount = tasks.filter((t) => t.included).length
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// 每个 (学生, 任务) 取最高分的提交；同分取最新
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const best = new Map<string, { id: string; score: number }>()
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if (studentCount && visibleTaskIds.size) {
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const subs = all<{ id: string; user_id: number; task_id: number; score: number }>(
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`SELECT s.id, s.user_id, s.task_id, s.score
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FROM submission_submission s JOIN account_user u ON u.id = s.user_id
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WHERE u.role IN ('normal', 'admin') AND u.classname = $classname
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ORDER BY s.user_id, s.task_id, s.score DESC, s.created DESC, s.id DESC`,
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{ classname },
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)
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for (const s of subs) {
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if (!visibleTaskIds.has(s.task_id)) continue
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const key = `${s.user_id}:${s.task_id}`
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if (!best.has(key)) best.set(key, s)
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}
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}
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let rows: GradebookRow[] = students.map((student) => {
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const scores: GradebookRow["scores"] = {}
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let tutorialTotal = 0
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let challengeTotal = 0
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const submittedScores: number[] = []
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let submittedTaskCount = 0
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let missingTaskCount = 0
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for (const task of tasks) {
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const sub = best.get(`${student.id}:${task.id}`)
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const cellScore = sub ? score(sub.score) : 0
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scores[task.id] = {
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score: cellScore,
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submitted: !!sub,
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submission_id: sub ? uuidOut(sub.id) : null,
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}
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if (!task.included) continue
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if (sub) {
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submittedTaskCount++
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submittedScores.push(cellScore)
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} else {
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missingTaskCount++
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}
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if (task.task_type === "tutorial") tutorialTotal += cellScore
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else challengeTotal += cellScore
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}
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tutorialTotal = score(tutorialTotal)
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challengeTotal = score(challengeTotal)
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const top3 = submittedScores.sort((a, b) => b - a).slice(0, 3)
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const top3Score = top3.length ? score(pySum(top3) / top3.length) : 0
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const totalScore = score(tutorialTotal + challengeTotal)
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return {
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user_id: student.id,
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username: student.username,
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classname: student.classname,
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rank: 0,
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grade: "E",
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assessment_grade: "E",
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assessment_score: 60,
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top3_score: top3Score,
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scores,
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tutorial_total: tutorialTotal,
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challenge_total: challengeTotal,
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total_score: totalScore,
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average_score: includedTaskCount ? score(totalScore / includedTaskCount) : null,
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submitted_task_count: submittedTaskCount,
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missing_task_count: missingTaskCount,
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}
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})
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rows.sort((a, b) => b.total_score - a.total_score || cmp(a.username, b.username))
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rows.forEach((row, i) => {
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row.rank = i + 1
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row.grade = gradeForRank(i + 1, studentCount)
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})
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// 考核等级：按最高三次提交均分单独排名后定级（不改变上面的总分排名）
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const assessmentOrder = [...rows].sort(
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(a, b) => b.top3_score - a.top3_score || cmp(a.username, b.username),
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)
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assessmentOrder.forEach((row, i) => {
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row.assessment_grade = assessmentGradeForRank(i + 1, studentCount)
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})
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// 考核分数：在各等级段内按名次线性铺开到对应分数段
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const groups = new Map<Grade, GradebookRow[]>()
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for (const row of assessmentOrder) {
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const g = groups.get(row.assessment_grade) ?? []
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g.push(row)
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groups.set(row.assessment_grade, g)
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}
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for (const [grade, group] of groups) {
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group.forEach((row, i) => {
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row.assessment_score = assessmentScore(i, group.length, grade)
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})
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}
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const username = filters.username?.trim().toLowerCase() ?? ""
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if (username) rows = rows.filter((r) => r.username.toLowerCase().includes(username))
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return {
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classname,
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classes,
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task_count: tasks.length,
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included_task_count: includedTaskCount,
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student_count: studentCount,
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coverage_threshold_count: coverageThreshold,
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tasks,
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rows,
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}
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}
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function csvNumber(value: number) {
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if (Number.isInteger(value)) return String(value)
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return pyRound(value, 2).toFixed(2).replace(/0+$/, "").replace(/\.$/, "")
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}
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const taskTypeLabel = (t: string) => (t === "tutorial" ? "教程" : "挑战")
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export function gradebookCsvRows(gb: Gradebook): (string | number)[][] {
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const rows: (string | number)[][] = [
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[
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"排名",
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"平时等级",
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"考核等级",
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"考核分数",
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"用户名",
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"班级",
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...gb.tasks.map((t) => `${taskTypeLabel(t.task_type)}${t.display}-${t.title}`),
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"教程合计",
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"挑战合计",
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"总分",
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"平均分",
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"已提交任务数",
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"未提交任务数",
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],
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]
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for (const row of gb.rows) {
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rows.push([
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row.rank,
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row.grade,
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row.assessment_grade,
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row.assessment_score,
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row.username,
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row.classname,
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...gb.tasks.map((t) => csvNumber(row.scores[t.id]!.score)),
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csvNumber(row.tutorial_total),
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csvNumber(row.challenge_total),
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csvNumber(row.total_score),
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row.average_score === null ? "" : csvNumber(row.average_score),
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row.submitted_task_count,
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row.missing_task_count,
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])
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}
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return rows
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}
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// 与 Python csv 模块默认行为一致：含逗号/引号/换行时加引号，行尾 \r\n
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export function toCsv(rows: (string | number)[][]) {
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const cell = (v: string | number) => {
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const s = String(v)
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return /[",\r\n]/.test(s) ? `"${s.replaceAll('"', '""')}"` : s
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}
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return rows.map((r) => r.map(cell).join(",")).join("\r\n") + "\r\n"
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}
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