| 1 | ; TODO optional text wrap |
| 2 | ; TODO write |
| 3 | ; TODO caching (use cache by default, unless explicitly asked for update) |
| 4 | ; - [x] value --> cache |
| 5 | ; - [x] value <-- cache |
| 6 | ; requires: commands |
| 7 | ; TODO timeline limits |
| 8 | ; TODO feed set operations (perhaps better done externally?) |
| 9 | ; TODO timeline as a result of a query (feed set op + filter expressions) |
| 10 | ; TODO named timelines |
| 11 | ; TODO config files |
| 12 | ; TODO parse "following" from feed |
| 13 | ; - following = <nick> <uri> |
| 14 | ; TODO parse mentions: |
| 15 | ; - @<source.nick source.url> | @<source.url> |
| 16 | ; TODO highlight mentions |
| 17 | ; TODO filter on mentions |
| 18 | ; TODO highlight hashtags |
| 19 | ; TODO filter on hashtags |
| 20 | ; TODO hashtags as channels? initial hashtag special? |
| 21 | ; TODO query language |
| 22 | ; TODO console logger colors by level ('error) |
| 23 | ; TODO file logger ('debug) |
| 24 | ; TODO commands: |
| 25 | ; - r | read |
| 26 | ; - see timeline ops above |
| 27 | ; - w | write |
| 28 | ; - arg or stdin |
| 29 | ; - nick expand to URI |
| 30 | ; - q | query |
| 31 | ; - see timeline ops above |
| 32 | ; - see hashtag and channels above |
| 33 | ; - d | download |
| 34 | ; - u | upload |
| 35 | ; - calls user-configured command to upload user's own feed file to their server |
| 36 | ; |
| 37 | ; Looks like a better CLI parser than "racket/cmdline": |
| 38 | ; https://docs.racket-lang.org/natural-cli/ |
| 39 | |
| 40 | #lang racket |
| 41 | |
| 42 | (require openssl/sha1) |
| 43 | (require racket/date) |
| 44 | |
| 45 | (require http-client) |
| 46 | (require rfc3339-old) |
| 47 | |
| 48 | (module+ test |
| 49 | (require rackunit)) |
| 50 | |
| 51 | (struct msg (ts_epoch ts_rfc3339 nick uri text)) |
| 52 | (struct feed (nick uri)) |
| 53 | |
| 54 | (define (concurrent-filter-map num_workers f xs) |
| 55 | ; TODO preserve order of elements OR communicate that reorder is expected |
| 56 | ; TODO switch from mailboxes to channels |
| 57 | (define (make-worker id f) |
| 58 | (define parent (current-thread)) |
| 59 | (λ () |
| 60 | (define self (current-thread)) |
| 61 | (define (work) |
| 62 | (thread-send parent (cons 'next self)) |
| 63 | (match (thread-receive) |
| 64 | ['done (thread-send parent (cons 'exit id))] |
| 65 | [(cons 'unit x) (begin |
| 66 | (define y (f x)) |
| 67 | (when y (thread-send parent (cons 'result y))) |
| 68 | (work))])) |
| 69 | (work))) |
| 70 | (define (dispatch ws xs ys) |
| 71 | (if (empty? ws) |
| 72 | ys |
| 73 | (match (thread-receive) |
| 74 | [(cons 'exit w) (dispatch (remove w ws =) xs ys)] |
| 75 | [(cons 'result y) (dispatch ws xs (cons y ys))] |
| 76 | [(cons 'next thd) (match xs |
| 77 | ['() (begin |
| 78 | (thread-send thd 'done) |
| 79 | (dispatch ws xs ys))] |
| 80 | [(cons x xs) (begin |
| 81 | (thread-send thd (cons 'unit x)) |
| 82 | (dispatch ws xs ys))])]))) |
| 83 | (define workers (range num_workers)) |
| 84 | (define threads (map (λ (id) (thread (make-worker id f))) workers)) |
| 85 | (define results (dispatch workers xs '())) |
| 86 | (for-each thread-wait threads) |
| 87 | results) |
| 88 | |
| 89 | (module+ test |
| 90 | (let* ([f (λ (x) (if (even? x) x #f))] |
| 91 | [xs (range 11)] |
| 92 | [actual (sort (concurrent-filter-map 10 f xs) <)] |
| 93 | [expected (sort ( filter-map f xs) <)]) |
| 94 | (check-equal? actual expected "concurrent-filter-map"))) |
| 95 | |
| 96 | (define (msg-print out-format odd msg) |
| 97 | (printf |
| 98 | (match out-format |
| 99 | ['single-line "~a \033[1;37m<~a ~a>\033[0m \033[0;~am~a\033[0m~n"] |
| 100 | ['multi-line "~a~n\033[1;37m<~a ~a>\033[0m~n\033[0;~am~a\033[0m~n~n"] |
| 101 | [_ (raise (format "Invalid output format: ~a" out-format))]) |
| 102 | (date->string (seconds->date [msg-ts_epoch msg]) #t) |
| 103 | (msg-nick msg) |
| 104 | (msg-uri msg) |
| 105 | (if odd 36 33) |
| 106 | (msg-text msg))) |
| 107 | |
| 108 | (define re-msg-begin |
| 109 | ; TODO Zulu offset. Maybe in several formats. Which ones? |
| 110 | (pregexp "^[0-9]{4}-[0-9]{2}-[0-9]{2}T[0-9]{2}:[0-9]{2}:[0-9]{2}")) |
| 111 | |
| 112 | (define (str->msg nick uri str) |
| 113 | (if (not (regexp-match? re-msg-begin str)) |
| 114 | (begin |
| 115 | (log-debug "Non-msg line from nick:~a, line:~a" nick str) |
| 116 | #f) |
| 117 | (let ([toks (string-split str (regexp "\t+"))]) |
| 118 | (if (not (= 2 (length toks))) |
| 119 | (begin |
| 120 | (log-warning "Invalid msg line from nick:~a, msg:~a" nick str) |
| 121 | #f) |
| 122 | (let* |
| 123 | ([ts_rfc3339 (first toks)] |
| 124 | [text (second toks)] |
| 125 | [t (string->rfc3339-record ts_rfc3339)] |
| 126 | ; TODO handle tz offset |
| 127 | [ts_epoch (find-seconds [rfc3339-record:second t] |
| 128 | [rfc3339-record:minute t] |
| 129 | [rfc3339-record:hour t] |
| 130 | [rfc3339-record:mday t] |
| 131 | [rfc3339-record:month t] |
| 132 | [rfc3339-record:year t])]) |
| 133 | (msg ts_epoch ts_rfc3339 nick uri text)))))) |
| 134 | |
| 135 | (module+ test |
| 136 | (let* ([ts "2020-11-18T22:22:09-0500"] |
| 137 | [tab " "] |
| 138 | [text "Lorem ipsum"] |
| 139 | [nick "foo"] |
| 140 | [uri "bar"] |
| 141 | [actual (str->msg nick uri (string-append ts tab text))] |
| 142 | [expected (msg 1605756129 ts nick uri text)]) |
| 143 | ; FIXME re-enable after handling tz offset |
| 144 | ;(check-equal? |
| 145 | ; (msg-ts_epoch actual) |
| 146 | ; (msg-ts_epoch expected) |
| 147 | ; "str->msg ts_epoch") |
| 148 | (check-equal? |
| 149 | (msg-ts_rfc3339 actual) |
| 150 | (msg-ts_rfc3339 expected) |
| 151 | "str->msg ts_rfc3339") |
| 152 | (check-equal? |
| 153 | (msg-nick actual) |
| 154 | (msg-nick expected) |
| 155 | "str->msg nick") |
| 156 | (check-equal? |
| 157 | (msg-uri actual) |
| 158 | (msg-uri expected) |
| 159 | "str->msg uri") |
| 160 | (check-equal? |
| 161 | (msg-text actual) |
| 162 | (msg-text expected) |
| 163 | "str->msg text"))) |
| 164 | |
| 165 | (define (str->lines str) |
| 166 | (string-split str (regexp "[\r\n]+"))) |
| 167 | |
| 168 | (module+ test |
| 169 | (check-equal? (str->lines "abc\ndef\n\nghi") '("abc" "def" "ghi"))) |
| 170 | |
| 171 | (define (str->msgs nick uri str) |
| 172 | (filter-map (λ (line) (str->msg nick uri line)) (str->lines str))) |
| 173 | |
| 174 | (define (hash-sha1 str) |
| 175 | (define in (open-input-string str)) |
| 176 | (define digest (sha1 in)) |
| 177 | (close-input-port in) |
| 178 | digest) |
| 179 | |
| 180 | (define (uri-fetch use-cache uri) |
| 181 | (define cache-file-path |
| 182 | (expand-user-path (string-append "~/.tt/cache/" (hash-sha1 uri)))) |
| 183 | (if (and use-cache (file-exists? cache-file-path)) |
| 184 | (begin |
| 185 | (log-info "uri-fetch cached ~a" uri) |
| 186 | (file->string cache-file-path)) |
| 187 | (begin |
| 188 | (log-info "uri-fetch new ~a" uri) |
| 189 | (let* ([resp (http-get uri)] |
| 190 | [status (http-response-code resp)] |
| 191 | [body (http-response-body resp)]) |
| 192 | (log-debug "finished GET ~a status:~a body length:~a" |
| 193 | uri status (string-length body)) |
| 194 | ; TODO Handle redirects |
| 195 | (if (= status 200) |
| 196 | (begin |
| 197 | (display-to-file body cache-file-path #:exists 'replace) |
| 198 | body) |
| 199 | ; TODO A more-informative exception |
| 200 | (raise status)))))) |
| 201 | |
| 202 | (define (timeline-print out-format timeline) |
| 203 | (for ([msg timeline] |
| 204 | [i (in-naturals)]) |
| 205 | (msg-print out-format (odd? i) msg))) |
| 206 | |
| 207 | (define (feed->msgs use-cache feed) |
| 208 | (log-info "downloading feed nick:~a uri:~a" |
| 209 | (feed-nick feed) |
| 210 | (feed-uri feed)) |
| 211 | (with-handlers |
| 212 | ([exn:fail:network? |
| 213 | (λ (e) |
| 214 | (log-error "network error nick:~a uri:~a exn:~a" |
| 215 | (feed-nick feed) |
| 216 | (feed-uri feed) |
| 217 | e) |
| 218 | #f)] |
| 219 | [integer? |
| 220 | (λ (status) |
| 221 | (log-error "http error nick:~a uri:~a status:~a" |
| 222 | (feed-nick feed) |
| 223 | (feed-uri feed) |
| 224 | status) |
| 225 | #f)]) |
| 226 | (define uri (feed-uri feed)) |
| 227 | (str->msgs [feed-nick feed] uri [uri-fetch use-cache uri]))) |
| 228 | |
| 229 | ; TODO timeline contract : time-sorted list of messages |
| 230 | (define (timeline use-cache num_workers feeds) |
| 231 | (sort (append* (concurrent-filter-map num_workers (curry feed->msgs use-cache) feeds)) |
| 232 | (λ (a b) [< (msg-ts_epoch a) (msg-ts_epoch b)]))) |
| 233 | |
| 234 | (define (str->feed str) |
| 235 | ; TODO validation |
| 236 | (define toks (string-split str)) |
| 237 | (apply feed toks)) |
| 238 | |
| 239 | (define (str->feeds str) |
| 240 | (map str->feed (str->lines str))) |
| 241 | |
| 242 | (define (file->feeds filename) |
| 243 | (str->feeds (file->string filename))) |
| 244 | |
| 245 | (define (user-agent prog-name prog-version) |
| 246 | (let* |
| 247 | ([prog-uri "https://github.com/xandkar/tt"] |
| 248 | [user-feed-file (expand-user-path "~/twtxt-me.txt")] |
| 249 | [user |
| 250 | (if (file-exists? user-feed-file) |
| 251 | (let ([user (first (file->feeds user-feed-file))]) |
| 252 | (format "+~a; @~a" (feed-uri user) (feed-nick user))) |
| 253 | (format "+~a" prog-uri))] |
| 254 | ) |
| 255 | (format "~a/~a (~a)" prog-name prog-version user))) |
| 256 | |
| 257 | (module+ main |
| 258 | (require setup/getinfo) |
| 259 | |
| 260 | (let* ([level 'info] |
| 261 | [logger (make-logger #f #f level #f)] |
| 262 | [log-receiver (make-log-receiver logger level)]) |
| 263 | (void (thread (λ () |
| 264 | [date-display-format 'iso-8601] |
| 265 | [let loop () |
| 266 | (define data (sync log-receiver)) |
| 267 | (define level (vector-ref data 0)) |
| 268 | (define msg (vector-ref data 1)) |
| 269 | (define ts (date->string (current-date) #t)) |
| 270 | (eprintf "~a [~a] ~a~n" ts level msg) |
| 271 | (loop)]))) |
| 272 | (current-logger logger)) |
| 273 | (current-http-response-auto #f) |
| 274 | (let* ([prog-name "tt"] |
| 275 | [prog-version ((get-info (list prog-name)) 'version)] |
| 276 | [user-agent (user-agent prog-name prog-version)]) |
| 277 | (current-http-user-agent user-agent)) |
| 278 | (date-display-format 'rfc2822) |
| 279 | (let* ([use-cache |
| 280 | #f] |
| 281 | [out-format |
| 282 | 'multi-line] |
| 283 | [num_workers |
| 284 | 15]) ; 15 was fastest out of the tried 1, 5, 10, 15 and 20. |
| 285 | (command-line |
| 286 | #:once-each |
| 287 | [("-c" "--cached") |
| 288 | "Read cached data instead of downloading." |
| 289 | (set! use-cache #t)] |
| 290 | |
| 291 | [("-j" "--jobs") |
| 292 | njobs "Number of concurrent jobs." |
| 293 | (set! num_workers (string->number njobs))] |
| 294 | |
| 295 | #:args (filename) |
| 296 | |
| 297 | (timeline-print out-format |
| 298 | (timeline use-cache |
| 299 | num_workers |
| 300 | (file->feeds filename)))))) |