List of known bugs

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PrismJS won't highlight

CodeJar element won't load (FIXED 21.10.31 18:28)

Tested

Output:

Uncaught (in promise) TypeError: grammar is undefined
  tokenize prism.js:658
  highlight prism.js:628
  highlight [slug].svelte:6
  create_if_block CodeJar.svelte:44
  create_fragment CodeJar.svelte:125
  init index.mjs:1806
  CodeJar CodeJar.svelte:385
  createProxiedComponent svelte-hooks.js:245
  ProxyComponent proxy.js:239
  Proxy<CodeJar> proxy.js:339
  create_if_block [slug].svelte:600
  update [slug].svelte:1058
  update index.mjs:1057
  flush index.mjs:1025
  promise callback*schedule_update index.mjs:1000
  make_dirty index.mjs:1759
  ctx index.mjs:1797
  instance [slug].svelte:1158
  run index.mjs:18
  mount_component index.mjs:1731
  flush index.mjs:1039
  promise callback*schedule_update index.mjs:1000
  make_dirty index.mjs:1759
  ctx index.mjs:1797
  $$set root.svelte:639
  get proxy.js:83
  $set index.mjs:1892
  key proxy.js:46
  update start.js:652
  handle_navigation start.js:607
  _navigate start.js:284
  init_listeners start.js:167
  init_listeners start.js:122
  start start.js:1186
  async* 1

Possible reasons:
- Bad module provided by svelte-codejar
- Not understanding PrismJS and svelte-codejar well enough
Suggested fix:
- Read over the documentation.
- Check if the props are being properly sent to the CodeJar component.
- Understand how CodeJar component handles syntax.
- Check what languages are supported by PrismJS and see if it needs extra settings.

A lot of requests are being sent to the backend (FIXED 21.10.22 22:00)
- Tested
- Around 4 reqs per second back to the backend
- Possible reasons:
  - The async call inside beforeUpdate() is being called way too often.
Docker Compose not reflecting code updates (FIXED 21.10.24 23:20)
- Tested
  - Filesystem inside the container reflects the code updates, but running docker logs show no difference between before and after the update.
  - Changes inside main.go are applied, but the ones inside /pkg are not.
- Possible reasons:
  - docker-compose is using the cached layers instead of rebuilding.
  - Go isn't building binaries correctly.
  - Go isn't importing pkg properly.
- Suggested fix:
  - docker-compose up --build
  - docker-compose build --no-cache && docker-compose up
  - Check for any typos in Go files, especially the ones inside /backend directory.
  - Review how Go modules and packages work.
Problemsets() returns an array data type, but Submissions() returns an object data type (FIXED 21.10.24 23:20)
- Tested
- Possible reasons:
  - API is sending over different data types.
  - Frontend is parsing the data weirdly.
- Suggested fix:
  - Check the backend API to see if it is sending a JSON or an array of JSONs.
Directory structure changes inside Docker container

RunTest() receives poorly formatted JSON from the frontend

Tested

Output:

RunTest() reached:    C++ class Solution { 
    public: vector<int> twoSum(vector<int>& nums, int target) {
        vector<int> solution; 
        for (auto& it : nums) { 
            solution.push_back(it + target); 
        } 
        
        return solution; 
    }
};

Possible reasons:
- The frontend parses languages as C++, Java, etc., while the backend expects cpp, java, etc.
Suggested fix:
- Properly format the request JSON body.

Unable to parse JSON response from backend

Tested

Output:

SyntaxError: Unexpected token M in JSON at position 0
    at JSON.parse (<anonymous>)
    at Response.json (file:///root/development/go-leetcode/frontend/leetcode/node_modules/@sveltejs/kit/dist/install-fetch.js:546:15)
    at processTicksAndRejections (node:internal/process/task_queues:96:5)
    at async load (/root/development/go-leetcode/frontend/leetcode/src/routes/solve/[slug].svelte:30:19)
    at async load_node (file:///root/development/go-leetcode/frontend/leetcode/node_modules/@sveltejs/kit/dist/ssr.js:937:12)
    at async respond$1 (file:///root/development/go-leetcode/frontend/leetcode/node_modules/@sveltejs/kit/dist/ssr.js:1221:15)
    at async render_page (file:///root/development/go-leetcode/frontend/leetcode/node_modules/@sveltejs/kit/dist/ssr.js:1386:19)
    at async resolve (file:///root/development/go-leetcode/frontend/leetcode/node_modules/@sveltejs/kit/dist/ssr.js:1648:10)
    at async respond (file:///root/development/go-leetcode/frontend/leetcode/node_modules/@sveltejs/kit/dist/ssr.js:1629:10)
    at async Immediate.<anonymous> (file:///root/development/go-leetcode/frontend/leetcode/node_modules/@sveltejs/kit/dist/chunks/index.js:3499:22)

Possible reasons:
- Bad response from backend
Suggested fix:
- Check backend code to see if JSON is properly parsed, or if the frontend is feeding the backend with enough information.

Panic after RunTest() is reached (FIXED 21.10.03 16:33)

Tested

Output:

./main.go output:
Error making POST request:  Post "http://jpoly1219devbox.xyz:8091/run": EOF

./containers/main.go output:
2021/10/02 06:32:20 http: panic serving 141.164.41.239:55438: runtime error: invalid memory address or nil pointer dereference
goroutine 20 [running]:
net/http.(*conn).serve.func1(0xc0000b2c80)
        /usr/local/go/src/net/http/server.go:1824 +0x153
panic(0x6f6e00, 0x946920)
        /usr/local/go/src/runtime/panic.go:971 +0x499
database/sql.(*DB).conn(0x0, 0x7b2290, 0xc0000a8000, 0xc0000ae001, 0x764220, 0xc0000bf710, 0x4dab4e)
        /usr/local/go/src/database/sql/sql.go:1197 +0x41
database/sql.(*DB).query(0x0, 0x7b2290, 0xc0000a8000, 0x75ca32, 0x42, 0xc0000bf8e0, 0x2, 0x2, 0xc000093001, 0x120, ...)
        /usr/local/go/src/database/sql/sql.go:1623 +0x66
database/sql.(*DB).QueryContext(0x0, 0x7b2290, 0xc0000a8000, 0x75ca32, 0x42, 0xc0000bf8e0, 0x2, 0x2, 0x693054, 0xc0000b2be0, ...)
        /usr/local/go/src/database/sql/sql.go:1605 +0xd4
database/sql.(*DB).Query(...)
        /usr/local/go/src/database/sql/sql.go:1619
main.RunTest(0x7b1ab0, 0xc00010e0e0, 0xc000122700)
        /root/development/go-leetcode/containers/main.go:372 +0x354
net/http.HandlerFunc.ServeHTTP(0x764278, 0x7b1ab0, 0xc00010e0e0, 0xc000122700)
        /usr/local/go/src/net/http/server.go:2069 +0x44
github.com/gorilla/mux.(*Router).ServeHTTP(0xc0000fc000, 0x7b1ab0, 0xc00010e0e0, 0xc000122300)
        /root/go/pkg/mod/github.com/gorilla/mux@v1.8.0/mux.go:210 +0xd3
net/http.serverHandler.ServeHTTP(0xc00010e000, 0x7b1ab0, 0xc00010e0e0, 0xc000122300)
        /usr/local/go/src/net/http/server.go:2887 +0xa3
net/http.(*conn).serve(0xc0000b2c80, 0x7b2300, 0xc0000d2300)
        /usr/local/go/src/net/http/server.go:1952 +0x8cd
created by net/http.(*Server).Serve
        /usr/local/go/src/net/http/server.go:3013 +0x39b

Possible reasons:
- Query statement may have a typo.
- Scan() parameter may be dereferencing a wrong variable.
- main.go has a global declaration var db *sql.Db, but main() re-declares db, err using :=
  - Using := inside main() effectively shadows the global db variable, which makes the value of db nil since this makes a new db local to main().
Suggested fix:
- Check the db query statement for any typos.
- Fix db declaration by declaring err prior to using db, err = sql.Open()

Cannot insert into attempts table

Tested
Output:

failed to insert attempt:  pq: insert or update on table "attempts" violates foreign key constraint "attempts_username_fkey"

Possible reasons
- Bad query statement
Suggested fix:
- Check the db query fields

loadSubmissions() loads infinitely
- Tested
- Possible reasons:
- beforeUpdate vs onMount
- Lifecycle
- nested async?

Uncaught (in promise) Error: {#each} only iterates over array-like objects. validate_each_argument index.mjs:1970 create_if_block_5 [slug].svelte:433 create_if_block_4 [slug].svelte:119 update [slug].svelte:1119 update index.mjs:1050 flush index.mjs:1018 promise callbackschedule_update index.mjs:993 make_dirty index.mjs:1752 ctx index.mjs:1790 tabChange [slug].svelte:1283 createEventDispatcher index.mjs:955 createEventDispatcher index.mjs:954 click_handler tabs.svelte:13 click_handler tabs.svelte:47 listen index.mjs:412 listen_dev index.mjs:1936 mount tabs.svelte:81 mount tabs.svelte:154 m svelte-hooks.js:197 mount_component index.mjs:1720 mount [slug].svelte:1047 m svelte-hooks.js:197 mount_component index.mjs:1720 update root.svelte:107 update root.svelte:331 update_slot_base index.mjs:98 update __layout.svelte:82 update index.mjs:1050 flush index.mjs:1018 promise callbackschedule_update index.mjs:993 make_dirty index.mjs:1752 ctx index.mjs:1790 $$set root.svelte:639 get proxy.js:83 $set index.mjs:1885 key proxy.js:46 update start.js:627 _navigate start.js:270 init_listeners start.js:153 init_listeners start.js:110 start start.js:1145 async* login:1016

Uncaught (in promise) ReferenceError: assignment to undeclared variable data loadSubmissions [slug].svelte:83 instance [slug].svelte:36 run index.mjs:18 mount_component index.mjs:1724 flush index.mjs:1032 promise callbackschedule_update index.mjs:993 make_dirty index.mjs:1752 ctx index.mjs:1790 $$set root.svelte:639 get proxy.js:83 $set index.mjs:1885 key proxy.js:46 update start.js:627 _navigate start.js:270 init_listeners start.js:153 init_listeners start.js:110 start start.js:1145 async login:1016

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