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PhutilLibraryMapBuilder.php
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Sun, Jun 2, 20:29

PhutilLibraryMapBuilder.php
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<?php
/**
* Build maps of libphutil libraries. libphutil uses the library map to locate
* and load classes and functions in the library.
*
* @task map Mapping libphutil Libraries
* @task path Path Management
* @task symbol Symbol Analysis and Caching
* @task source Source Management
*/
final class PhutilLibraryMapBuilder extends Phobject {
private $root;
private $quiet = true;
private $subprocessLimit = 8;
private $fileSymbolMap;
private $librarySymbolMap;
const LIBRARY_MAP_VERSION_KEY = '__library_version__';
const LIBRARY_MAP_VERSION = 2;
const SYMBOL_CACHE_VERSION_KEY = '__symbol_cache_version__';
const SYMBOL_CACHE_VERSION = 11;
/* -( Mapping libphutil Libraries )---------------------------------------- */
/**
* Create a new map builder for a library.
*
* @param string Path to the library root.
*
* @task map
*/
public function __construct($root) {
$this->root = $root;
}
/**
* Control status output. Use `--quiet` to set this.
*
* @param bool If true, don't show status output.
* @return this
*
* @task map
*/
public function setQuiet($quiet) {
$this->quiet = $quiet;
return $this;
}
/**
* Control subprocess parallelism limit. Use `--limit` to set this.
*
* @param int Maximum number of subprocesses to run in parallel.
* @return this
*
* @task map
*/
public function setSubprocessLimit($limit) {
$this->subprocessLimit = $limit;
return $this;
}
/**
* Get the map of symbols in this library, analyzing the library to build it
* if necessary.
*
* @return map<string, wild> Information about symbols in this library.
*
* @task map
*/
public function buildMap() {
if ($this->librarySymbolMap === null) {
$this->analyzeLibrary();
}
return $this->librarySymbolMap;
}
/**
* Get the map of files in this library, analyzing the library to build it
* if necessary.
*
* Returns a map of file paths to information about symbols used and defined
* in the file.
*
* @return map<string, wild> Information about files in this library.
*
* @task map
*/
public function buildFileSymbolMap() {
if ($this->fileSymbolMap === null) {
$this->analyzeLibrary();
}
return $this->fileSymbolMap;
}
/**
* Build and update the library map.
*
* @return void
*
* @task map
*/
public function buildAndWriteMap() {
$library_map = $this->buildMap();
$this->log(pht('Writing map...'));
$this->writeLibraryMap($library_map);
}
/**
* Write a status message to the user, if not running in quiet mode.
*
* @param string Message to write.
* @return this
*
* @task map
*/
private function log($message) {
if (!$this->quiet) {
@fwrite(STDERR, "%s\n", $message);
}
return $this;
}
/* -( Path Management )---------------------------------------------------- */
/**
* Get the path to some file in the library.
*
* @param string A library-relative path. If omitted, returns the library
* root path.
* @return string An absolute path.
*
* @task path
*/
private function getPath($path = '') {
return $this->root.'/'.$path;
}
/**
* Get the path to the symbol cache file.
*
* @return string Absolute path to symbol cache.
*
* @task path
*/
private function getPathForSymbolCache() {
return $this->getPath('.phutil_module_cache');
}
/**
* Get the path to the map file.
*
* @return string Absolute path to the library map.
*
* @task path
*/
private function getPathForLibraryMap() {
return $this->getPath('__phutil_library_map__.php');
}
/**
* Get the path to the library init file.
*
* @return string Absolute path to the library init file
*
* @task path
*/
private function getPathForLibraryInit() {
return $this->getPath('__phutil_library_init__.php');
}
/* -( Symbol Analysis and Caching )---------------------------------------- */
/**
* Load the library symbol cache, if it exists and is readable and valid.
*
* @return dict Map of content hashes to cache of output from
* `phutil_symbols.php`.
*
* @task symbol
*/
private function loadSymbolCache() {
$cache_file = $this->getPathForSymbolCache();
try {
$cache = Filesystem::readFile($cache_file);
} catch (Exception $ex) {
$cache = null;
}
$symbol_cache = array();
if ($cache) {
try {
$symbol_cache = phutil_json_decode($cache);
} catch (PhutilJSONParserException $ex) {
$symbol_cache = array();
}
}
$version = idx($symbol_cache, self::SYMBOL_CACHE_VERSION_KEY);
if ($version != self::SYMBOL_CACHE_VERSION) {
// Throw away caches from a different version of the library.
$symbol_cache = array();
}
unset($symbol_cache[self::SYMBOL_CACHE_VERSION_KEY]);
return $symbol_cache;
}
/**
* Write a symbol map to disk cache.
*
* @param dict Symbol map of relative paths to symbols.
* @param dict Source map (like @{method:loadSourceFileMap}).
* @return void
*
* @task symbol
*/
private function writeSymbolCache(array $symbol_map, array $source_map) {
$cache_file = $this->getPathForSymbolCache();
$cache = array(
self::SYMBOL_CACHE_VERSION_KEY => self::SYMBOL_CACHE_VERSION,
);
foreach ($symbol_map as $file => $symbols) {
$cache[$source_map[$file]] = $symbols;
}
$json = json_encode($cache);
try {
Filesystem::writeFile($cache_file, $json);
} catch (FilesystemException $ex) {
$this->log(pht('Unable to save the cache!'));
}
}
/**
* Drop the symbol cache, forcing a clean rebuild.
*
* @return this
*
* @task symbol
*/
public function dropSymbolCache() {
$this->log(pht('Dropping symbol cache...'));
Filesystem::remove($this->getPathForSymbolCache());
}
/**
* Build a future which returns a `phutil_symbols.php` analysis of a source
* file.
*
* @param string Relative path to the source file to analyze.
* @return Future Analysis future.
*
* @task symbol
*/
private function buildSymbolAnalysisFuture($file) {
$absolute_file = $this->getPath($file);
$bin = dirname(__FILE__).'/../../scripts/phutil_symbols.php';
return new ExecFuture('php %s --ugly -- %s', $bin, $absolute_file);
}
/* -( Source Management )-------------------------------------------------- */
/**
* Build a map of all source files in a library to hashes of their content.
* Returns an array like this:
*
* array(
* 'src/parser/ExampleParser.php' => '60b725f10c9c85c70d97880dfe8191b3',
* // ...
* );
*
* @return dict Map of library-relative paths to content hashes.
* @task source
*/
private function loadSourceFileMap() {
$root = $this->getPath();
$init = $this->getPathForLibraryInit();
if (!Filesystem::pathExists($init)) {
throw new Exception(
pht(
"Provided path '%s' is not a %s library.",
$root,
'phutil'));
}
$files = id(new FileFinder($root))
->withType('f')
->withSuffix('php')
->excludePath('*/.*')
->setGenerateChecksums(true)
->find();
$map = array();
foreach ($files as $file => $hash) {
$file = Filesystem::readablePath($file, $root);
$file = ltrim($file, '/');
if (dirname($file) == '.') {
// We don't permit normal source files at the root level, so just ignore
// them; they're special library files.
continue;
}
if (dirname($file) == 'extensions') {
// Ignore files in the extensions/ directory.
continue;
}
// We include also filename in the hash to handle cases when the file is
// moved without modifying its content.
$map[$file] = md5($hash.$file);
}
return $map;
}
/**
* Convert the symbol analysis of all the source files in the library into
* a library map.
*
* @param dict Symbol analysis of all source files.
* @return dict Library map.
* @task source
*/
private function buildLibraryMap(array $symbol_map) {
$library_map = array(
'class' => array(),
'function' => array(),
'xmap' => array(),
);
// Detect duplicate symbols within the library.
foreach ($symbol_map as $file => $info) {
foreach ($info['have'] as $type => $symbols) {
foreach ($symbols as $symbol => $declaration) {
$lib_type = ($type == 'interface') ? 'class' : $type;
if (!empty($library_map[$lib_type][$symbol])) {
$prior = $library_map[$lib_type][$symbol];
throw new Exception(
pht(
"Definition of %s '%s' in file '%s' duplicates prior ".
"definition in file '%s'. You can not declare the ".
"same symbol twice.",
$type,
$symbol,
$file,
$prior));
}
$library_map[$lib_type][$symbol] = $file;
}
}
$library_map['xmap'] += $info['xmap'];
}
// Simplify the common case (one parent) to make the file a little easier
// to deal with.
foreach ($library_map['xmap'] as $class => $extends) {
if (count($extends) == 1) {
$library_map['xmap'][$class] = reset($extends);
}
}
// Sort the map so it is relatively stable across changes.
foreach ($library_map as $key => $symbols) {
ksort($symbols);
$library_map[$key] = $symbols;
}
ksort($library_map);
return $library_map;
}
/**
* Write a finalized library map.
*
* @param dict Library map structure to write.
* @return void
*
* @task source
*/
private function writeLibraryMap(array $library_map) {
$map_file = $this->getPathForLibraryMap();
$version = self::LIBRARY_MAP_VERSION;
$library_map = array(
self::LIBRARY_MAP_VERSION_KEY => $version,
) + $library_map;
$library_map = phutil_var_export($library_map);
$at = '@';
$source_file = <<<EOPHP
<?php
/**
* This file is automatically generated. Use 'arc liberate' to rebuild it.
*
* {$at}generated
* {$at}phutil-library-version {$version}
*/
phutil_register_library_map({$library_map});
EOPHP;
Filesystem::writeFile($map_file, $source_file);
}
/**
* Analyze the library, generating the file and symbol maps.
*
* @return void
*/
private function analyzeLibrary() {
// Identify all the ".php" source files in the library.
$this->log(pht('Finding source files...'));
$source_map = $this->loadSourceFileMap();
$this->log(
pht('Found %s files.', new PhutilNumber(count($source_map))));
// Load the symbol cache with existing parsed symbols. This allows us
// to remap libraries quickly by analyzing only changed files.
$this->log(pht('Loading symbol cache...'));
$symbol_cache = $this->loadSymbolCache();
// If the XHPAST binary is not up-to-date, build it now. Otherwise,
// `phutil_symbols.php` will attempt to build the binary and will fail
// miserably because it will be trying to build the same file multiple
// times in parallel.
if (!PhutilXHPASTBinary::isAvailable()) {
PhutilXHPASTBinary::build();
}
// Build out the symbol analysis for all the files in the library. For
// each file, check if it's in cache. If we miss in the cache, do a fresh
// analysis.
$symbol_map = array();
$futures = array();
foreach ($source_map as $file => $hash) {
if (!empty($symbol_cache[$hash])) {
$symbol_map[$file] = $symbol_cache[$hash];
continue;
}
$futures[$file] = $this->buildSymbolAnalysisFuture($file);
}
$this->log(
pht('Found %s files in cache.', new PhutilNumber(count($symbol_map))));
// Run the analyzer on any files which need analysis.
if ($futures) {
$limit = $this->subprocessLimit;
$this->log(
pht(
'Analyzing %s file(s) with %s subprocess(es)...',
phutil_count($futures),
new PhutilNumber($limit)));
$progress = new PhutilConsoleProgressBar();
if ($this->quiet) {
$progress->setQuiet(true);
}
$progress->setTotal(count($futures));
$futures = id(new FutureIterator($futures))
->limit($limit);
foreach ($futures as $file => $future) {
$result = $future->resolveJSON();
if (empty($result['error'])) {
$symbol_map[$file] = $result;
} else {
$progress->done(false);
throw new XHPASTSyntaxErrorException(
$result['line'],
$file.': '.$result['error']);
}
$progress->update(1);
}
$progress->done();
}
$this->fileSymbolMap = $symbol_map;
// We're done building the cache, so write it out immediately. Note that
// we've only retained entries for files we found, so this implicitly cleans
// out old cache entries.
$this->writeSymbolCache($symbol_map, $source_map);
// Our map is up to date, so either show it on stdout or write it to disk.
$this->log(pht('Building library map...'));
$this->librarySymbolMap = $this->buildLibraryMap($symbol_map);
}
}

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