wisski-cloud-distillery/internal/phpx/server.php
Tom a9572e6613 phpx/server: improve wire format
This commit updates the wire format of the phpx server. Instead of being
string-based, messages sent back and forth between go and php are now
base64-encoded DEFLATEd strings. This makes them a lot smaller and
faster to send.
2023-05-01 15:50:21 +02:00

53 lines
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1.6 KiB
PHP

<?php
// This file contains code to execute a php execution server.
// It is passed as a *command line literal * directly to 'drush:script'.
//
// As such it is preprocessed and shortened.
// This preprocessing is script-specific, and any changes in here might break that optimization.
// It should only contain comments at the beginning of each line, and only starting with '//'.
// See server.go.
// This file runs an infinite REPL-like loop.
// It continously reads from standard input, decodes code to pass to eval(), and send the result back.
//
// Commands are read in DEFLATE base64 encoding (to prevent having to send too much over the wire).
// Results are written to STDOUT back in base64 DEFLATE encoding.
// The results are of the form [$result,$error] - $result being the actual object returned, and $error an error string.
// define a json_encode alias, this saves a single character!
// (we also reuse it in the error string)
$E = 'json_encode';
// prevent STDIN from being buffered
stream_set_read_buffer(STDIN,0);
while(1) {
// stop outputting errors when executing
ob_start(null,0,PHP_OUTPUT_HANDLER_CLEANABLE);
// read the next line (which will be code to execute)
$b = fgets(STDIN) or exit(0);
// read the next command to parse
$b = gzinflate(base64_decode($b));
// execute the code, and json_encode it
try {
$j = $E([eval($b),""]);
} catch(Throwable $t) {
$j = $E([null,(string)$t]);
}
// if something went wrong, return an error.
if($j === false) {
$j = '[null,"' . $E . ' Error"]';
}
// and write out the result
ob_end_clean();
// deflate and base64_encode
$j = base64_encode(gzdeflate($j));
fwrite(STDOUT,"$j\n");
}