git.giacomolli.uk - onechat/blob - telegram_fake_helper_test.go

   1 package main
   2
   3 import (
   4         "encoding/json"
   5         "fmt"
   6         "io"
   7         "net/http"
   8         "net/http/httptest"
   9         "strings"
  10         "sync"
  11         "testing"
  12         "time"
  13 )
  14
  15 const (
  16         // telegramTestToken is the bot token of the tests. It has the form of a
  17         // real token.
  18         telegramTestToken = "123456:TEST-secret_token"
  19
  20         // telegramTestOwner is the user ID of the owner of the test bot.
  21         telegramTestOwner = 4242
  22 )
  23
  24 // TelegramFakeCall is one call of the fake Bot API. OK tells if the call got a
  25 // success answer.
  26 type TelegramFakeCall struct {
  27         method string
  28         params map[string]any
  29         ok     bool
  30 }
  31
  32 // TelegramFake is a fake Bot API server for telegramTestToken. getUpdates
  33 // returns the added updates from the offset on, or waits a short time when
  34 // there are none. The other methods succeed, unless fail gives an error answer
  35 // for a call. An answer with HTTP 429 asks for a wait of one second. When stall
  36 // is true for a call, the call gets no answer until the client gives it up or
  37 // the test ends. Fail and stall run with the mutex held.
  38 type TelegramFake struct {
  39         *httptest.Server
  40
  41         mutex   sync.Mutex
  42         updates []TelegramUpdate
  43         calls   []TelegramFakeCall
  44         fail    func(call TelegramFakeCall) (int, string)
  45         stall   func(call TelegramFakeCall) bool
  46         added   chan struct{}
  47         stopped chan struct{}
  48 }
  49
  50 // Add makes update available to getUpdates.
  51 func (f *TelegramFake) Add(update TelegramUpdate) {
  52         f.mutex.Lock()
  53         f.updates = append(f.updates, update)
  54         f.mutex.Unlock()
  55
  56         select {
  57         case f.added <- struct{}{}:
  58         default:
  59         }
  60 }
  61
  62 // Calls returns the calls so far.
  63 func (f *TelegramFake) Calls() []TelegramFakeCall {
  64         f.mutex.Lock()
  65         defer f.mutex.Unlock()
  66
  67         return append([]TelegramFakeCall(nil), f.calls...)
  68 }
  69
  70 // Sent returns the texts of the sendMessage calls and the Markdown of the
  71 // sendRichMessage calls that succeeded, in order.
  72 func (f *TelegramFake) Sent() []string {
  73         var texts []string
  74         for _, call := range f.Calls() {
  75                 switch {
  76                 case !call.ok:
  77                 case call.method == "sendMessage":
  78                         texts = append(texts, call.params["text"].(string))
  79                 case call.method == "sendRichMessage":
  80                         texts = append(texts, call.params["rich_message"].(map[string]any)["markdown"].(string))
  81                 }
  82         }
  83
  84         return texts
  85 }
  86
  87 func (f *TelegramFake) serve(w http.ResponseWriter, r *http.Request) {
  88         method, found := strings.CutPrefix(r.URL.Path, "/bot"+telegramTestToken+"/")
  89         if !found {
  90                 http.Error(w, `{"ok":false,"error_code":404,"description":"Not Found"}`, http.StatusNotFound)
  91                 return
  92         }
  93
  94         var params map[string]any
  95         err := json.NewDecoder(r.Body).Decode(&params)
  96         if err != nil {
  97                 http.Error(w, err.Error(), http.StatusBadRequest)
  98                 return
  99         }
 100
 101         call := TelegramFakeCall{
 102                 method: method,
 103                 params: params,
 104         }
 105
 106         f.mutex.Lock()
 107         status, description := 0, ""
 108         if f.fail != nil {
 109                 status, description = f.fail(call)
 110         }
 111
 112         stall := f.stall != nil && f.stall(call)
 113         f.mutex.Unlock()
 114
 115         if stall {
 116                 f.record(call)
 117                 select {
 118                 case <-r.Context().Done():
 119                 case <-f.stopped:
 120                 }
 121
 122                 return
 123         }
 124
 125         if status != 0 {
 126                 f.record(call)
 127                 w.WriteHeader(status)
 128                 wait := 0
 129                 if status == http.StatusTooManyRequests {
 130                         wait = 1
 131                 }
 132
 133                 _, _ = fmt.Fprintf(w, `{"ok":false,"error_code":%d,"description":%q,"parameters":{"retry_after":%d}}`, status, description, wait)
 134
 135                 return
 136         }
 137
 138         call.ok = true
 139         f.record(call)
 140         if method != "getUpdates" {
 141                 _, _ = io.WriteString(w, `{"ok":true,"result":true}`)
 142                 return
 143         }
 144
 145         offset := int64(params["offset"].(float64))
 146         updates := f.from(offset)
 147         if len(updates) == 0 {
 148                 select {
 149                 case <-f.added:
 150                 case <-time.After(50 * time.Millisecond):
 151                 case <-r.Context().Done():
 152                 }
 153
 154                 updates = f.from(offset)
 155         }
 156
 157         _ = json.NewEncoder(w).Encode(map[string]any{
 158                 "ok":     true,
 159                 "result": updates,
 160         })
 161 }
 162
 163 // record keeps call.
 164 func (f *TelegramFake) record(call TelegramFakeCall) {
 165         f.mutex.Lock()
 166         defer f.mutex.Unlock()
 167
 168         f.calls = append(f.calls, call)
 169 }
 170
 171 // from returns the updates from offset on, and forgets the ones before it, as
 172 // Telegram does.
 173 func (f *TelegramFake) from(offset int64) []TelegramUpdate {
 174         f.mutex.Lock()
 175         defer f.mutex.Unlock()
 176
 177         var updates []TelegramUpdate
 178         kept := f.updates[:0]
 179         for _, update := range f.updates {
 180                 if update.UpdateID >= offset {
 181                         updates = append(updates, update)
 182                         kept = append(kept, update)
 183                 }
 184         }
 185
 186         f.updates = kept
 187
 188         return updates
 189 }
 190
 191 // newTelegramFake starts a fake Bot API server that stops at the end of the
 192 // test.
 193 func newTelegramFake(t *testing.T) *TelegramFake {
 194         t.Helper()
 195
 196         f := &TelegramFake{
 197                 added:   make(chan struct{}, 1),
 198                 stopped: make(chan struct{}),
 199         }
 200
 201         f.Server = httptest.NewServer(http.HandlerFunc(f.serve))
 202         t.Cleanup(f.Close)
 203         t.Cleanup(func() {
 204                 close(f.stopped)
 205         })
 206
 207         return f
 208 }
 209
 210 // telegramOwnerMessage returns a text message of the owner in the private chat.
 211 func telegramOwnerMessage(text string) *TelegramMessage {
 212         return &TelegramMessage{
 213                 Chat: TelegramChat{
 214                         ID:   telegramTestOwner,
 215                         Type: "private",
 216                 },
 217                 From: &TelegramUser{
 218                         ID: telegramTestOwner,
 219                 },
 220                 Text: text,
 221         }
 222 }