permafrost-dev / codeboost

import { BoostHistory, BoostHistoryItem, BoostHistoryItemState } from '@/types/BoostHistory';

import { CodeBoost } from '@/lib/CodeBoost';

import { generateRunId, versionToShortVersion } from '@/lib/helpers';

import { Repository } from '@/lib/Repository';

import { Tools } from '@/lib/Tools';

import { BoostConfiguration } from '@/types/BoostConfiguration';

import edge from 'edge.js';

import { existsSync, readFileSync } from 'fs';

import semver from 'semver';

import simpleGit, { SimpleGit, SimpleGitBase } from 'simple-git';

import dayjs from 'dayjs';

import { Github } from '@/lib/github';

import { eventbus } from '@/lib/EventBus';

import { GIT_FILE_ADDED_EVENT } from '@/lib/Events';

export interface BoostScriptHandlerParameters {

    /** arguments passed in from the user */

    args: any[];

    /** the boost instance */

    boost: Boost;

    /** information about the current boost run */

    currentRun: BoostHistoryItem;

    /** a simpleGit instance for the repository */

    git: SimpleGit;

    /** a collection of commonly-used libraries available to the boost scripts */

    libs: {

        fs: typeof import('fs');

        path: typeof import('path');

        semver: typeof import('semver');

    };

    /** the repository instance */

    repository: Repository;

    /** a collection of utility functions available to the boost scripts */

    tools: Tools;

}

export type BoostScriptHandler = (params: BoostScriptHandlerParameters) => any;

export class Boost {

    protected codeBoost!: CodeBoost;

    protected repository: Repository | null = null;

    public config!: BoostConfiguration;

    public path!: string;

    public id!: string;

    public version!: string;

    public repositoryLimits!: {

        maxRunsPerVersion: number;

        minutesBetweenRuns: number;

    };

    public pullRequest!: {

        title: string;

        body: string;

        branch: string;

    };

    public scripts!: any[];

    public actions!: any[];

    public state: Record<string, any> = {};

    public changedFiles: string[] = [];

    public runId: string;

    constructor(codeBoost: CodeBoost, boostPath: string) {

        this.runId = generateRunId();

        this.config = this.loadConfiguration(boostPath);

        this.codeBoost = codeBoost;

        this.init(boostPath);

    }

    public init(boostPath: string) {

        this.path = `${boostPath}/${this.config.version}`;

        this.id = this.config.id;

        this.version = this.config.version;

        this.repositoryLimits = {

            maxRunsPerVersion: this.config.repository_limits.max_runs_per_version,

            minutesBetweenRuns: this.config.repository_limits.minutes_between_runs,

        };

        this.pullRequest = this.loadPullRequest(this.config.pull_request);

        this.scripts = this.loadScripts(this.config.scripts.files);

    }

    public get appSettings(): AppSettings {

        return this.codeBoost.appSettings;

    }

    public get history(): BoostHistory {

        return this.codeBoost.historyManager.for(this.id);

    }

    public log(message) {

        this.codeBoost.log(message, [{ boost: this.id, run_id: this.runId, repository: this.repository?.fullRepositoryName() }]);

    }

    public loadConfiguration(boostPath: string) {

        const config = require(`${boostPath}/boost.js`).default;

        return <BoostConfiguration>config;

    }

    public loadPullRequest(pullRequest: Record<string, any>) {

        return {

            title: pullRequest.title,

            body: pullRequest.body,

            branch: `${pullRequest.branch}-v${versionToShortVersion(this.version)}`,

        };

    }

    public loadScripts(scripts: string[]) {

        const result: any[] = [];

        for (const script of scripts) {

            const fn = `${this.path}/${script}`;

            if (!existsSync(fn)) {

                throw new Error(`Boost script not found: ${fn}`);

            }

            result.push(require(fn).handler);

        }

        return result;

    }

    public async run(repository: Repository, args: any[] = []) {

        this.repository = repository;

        this.repository.initGitListeners(this.runId);

        const listener = eventbus.on(GIT_FILE_ADDED_EVENT, ({ repository, files, runId }) => {

            if (runId !== this.runId || this.repository?.fullRepositoryName() !== `${repository.owner}/${repository.name}`) {

                return;

            }

            this.changedFiles.push(...files);

        });

        // changes to historyItem properties will be reflected in the saved history automatically

        // as createEntry returns a proxy object

        const historyItem: BoostHistoryItem = this.codeBoost.historyManager.createEntry({

            run_id: this.runId,

            boost: this.id,

            version: this.version,

            repository: repository.fullRepositoryName(),

            started_at: new Date().toISOString(),

            finished_at: null,

            state: BoostHistoryItemState.RUNNING,

            pull_request: null,

        });

        if (!this.canRunOnRepository(repository)) {

            historyItem.state = BoostHistoryItemState.SKIPPED;

            historyItem.finished_at = new Date().toISOString();

            this.log(`Cannot run on ${repository.fullRepositoryName()}`);

            this.log('Done.');

            return false;

        }

        const params = await this.createScriptHandlerParameters(args, historyItem);

        const catchErrors = async (callBack: CallableFunction, args: any = []) => {

            try {

                return await await callBack(...args);

            } catch (e) {

                hasError = true;

                this.log(e);

                return false;

            }

        };

        const handleDryRun = async (callback: CallableFunction, dryRunMessage: string) => {

            if (!this.appSettings.dry_run) {

                return await callback();

            }

            this.log(`[dry run] ${dryRunMessage}`);

            return null;

        };

        let hasError = false;

        if (!this.appSettings.use_pull_requests) {

            this.pullRequest.branch = await repository.defaultBranch();

        }

        if (this.appSettings.use_pull_requests) {

            await this.updatePullRequestBranchName();

            await this.checkoutPullRequestBranch();

        }

        await catchErrors(async () => {

            await this.runInitializationScript(params);

            await this.runScripts(params);

        });

        if (!hasError && this.changedFiles.length > 0) {

            await catchErrors(async () => {

                const remote = this.appSettings.use_forks ? 'fork' : 'origin';

                await handleDryRun(

                    async () => await repository.git.push(remote, this.pullRequest.branch),

                    `push branch ${this.pullRequest.branch} to ${remote}`,

                );

            });

            await catchErrors(async () => {

                handleDryRun(async () => {

                    await this.handlePullRequestCreation({ repository, historyItem });

                }, 'create pull request');

            });

        }

        historyItem.finished_at = new Date().toISOString();

        historyItem.state = hasError ? BoostHistoryItemState.FAILED : BoostHistoryItemState.SUCCEEDED;

        listener.off(GIT_FILE_ADDED_EVENT, () => {});

    }

    public async handlePullRequestCreation({ repository, historyItem }) {

        if (!this.appSettings.use_pull_requests) {

            return;

        }

        const loadStringOrFile = (value: string) => {

            return existsSync(`${this.path}/${value}`) ? readFileSync(`${this.path}/${value}`, 'utf8') : value;

        };

        const title = await edge.renderRaw(loadStringOrFile(this.pullRequest.title), { boost: this, state: () => this.state });

        const body = await edge.renderRaw(loadStringOrFile(this.pullRequest.body), { boost: this, state: () => this.state });

        const defaultBranch = (await this.repository?.defaultBranch()) ?? 'main';

        const pr: any = await Github.createPullRequest(repository, this.pullRequest.branch, defaultBranch, title.trim(), body.trim());

        historyItem.pull_request = pr?.number;

        if (pr) {

            this.log(`created pull request #${pr.number}`);

            if (this.appSettings.auto_merge_pull_requests) {

                await Github.mergePullRequest(repository, pr.number);

                this.log(`merged pull request #${pr.number}`);

            }

        }

    }

    public async createScriptHandlerParameters(args: any[], historyItem: BoostHistoryItem) {

        return <BoostScriptHandlerParameters>{

            args,

            boost: this,

            currentRun: Object.freeze(Object.assign({}, historyItem)),

            git: this.repository?.git,

            libs: {

                fs: require('fs'),

                path: require('path'),

                semver,

            },

            repository: this.repository,

            tools: new Tools(),

        };

    }

    public async runInitializationScript(params: BoostScriptHandlerParameters) {

        if (existsSync(`${this.path}/init.js`)) {

            const initFn = require(`${this.path}/init.js`).handler;

            await initFn(params);

        }

    }

    public async checkoutPullRequestBranch() {

        await this.repository?.checkout(this.pullRequest.branch);

    }

    /**

     * update to a unique branch name if the branch already exists

     */

    public async updatePullRequestBranchName() {

        if (!this.repository) {

            return false;

        }

        const branches = await this.repository.localBranches();

        if (branches.all.includes(this.pullRequest.branch)) {

            let counter = 1;

            let newBranchName = this.pullRequest.branch;

            while (branches.all.includes(newBranchName)) {

                counter++;

                newBranchName = `${this.pullRequest.branch}-${counter}`;

            }

            this.pullRequest.branch = newBranchName;

        }

        return true;

    }

    }

    public canRunOnRepository(repo: Repository | string) {

        const repoName = typeof repo === 'string' ? repo : repo.fullRepositoryName();

        const runs = this.history

            .filter(run => run.repository === repoName)

            .filter(run => run.version === this.version && run.run_id !== this.runId)

            .filter(run => run.state !== BoostHistoryItemState.SKIPPED);

        if (this.repositoryLimits.maxRunsPerVersion <= runs.length) {

            return false;

        }

        return !this.isRunTimeRestricted(runs);

    }

    protected isRunTimeRestricted(runs: BoostHistoryItem[]): boolean {

        for (const item of runs) {

            const runDate = dayjs(item.started_at);

            if (dayjs().diff(runDate, 'minute') < this.repositoryLimits.minutesBetweenRuns) {

                return true;

            }

        }

        return false;

    }

}