@Override
public SkyValue compute(SkyKey skyKey, Environment env)
throws WorkspaceFileFunctionException, InterruptedException {
RootedPath workspaceRoot = (RootedPath) skyKey.argument();
FileValue workspaceFileValue = (FileValue) env.getValue(FileValue.key(workspaceRoot));
if (workspaceFileValue == null) {
return null;
}
Path repoWorkspace = workspaceRoot.getRoot().getRelative(workspaceRoot.getRelativePath());
Builder builder =
new Builder(repoWorkspace, packageFactory.getRuleClassProvider().getRunfilesPrefix());
WorkspaceFactory parser =
new WorkspaceFactory(
builder, packageFactory.getRuleClassProvider(), installDir.getPathString());
parser.parse(
ParserInputSource.create(
ruleClassProvider.getDefaultWorkspaceFile(), new PathFragment("DEFAULT.WORKSPACE")));
if (!workspaceFileValue.exists()) {
return new PackageValue(builder.build());
}
try {
parser.parse(ParserInputSource.create(repoWorkspace));
} catch (IOException e) {
throw new WorkspaceFileFunctionException(e, Transience.TRANSIENT);
}
return new PackageValue(builder.build());
}
/** Creates the Extension to be imported. */
private Extension createExtension(
BuildFileAST ast, PathFragment file, Map<PathFragment, Extension> importMap, Environment env)
throws InterruptedException, SkylarkImportLookupFunctionException {
StoredEventHandler eventHandler = new StoredEventHandler();
// TODO(bazel-team): this method overestimates the changes which can affect the
// Skylark RuleClass. For example changes to comments or unused functions can modify the hash.
// A more accurate - however much more complicated - way would be to calculate a hash based on
// the transitive closure of the accessible AST nodes.
try (Mutability mutability = Mutability.create("importing %s", file)) {
com.google.devtools.build.lib.syntax.Environment extensionEnv =
ruleClassProvider
.createSkylarkRuleClassEnvironment(
mutability, eventHandler, ast.getContentHashCode(), importMap)
.setupOverride("native", packageFactory.getNativeModule());
ast.exec(extensionEnv, eventHandler);
SkylarkRuleClassFunctions.exportRuleFunctions(extensionEnv, file);
Event.replayEventsOn(env.getListener(), eventHandler.getEvents());
if (eventHandler.hasErrors()) {
throw new SkylarkImportLookupFunctionException(SkylarkImportFailedException.errors(file));
}
return new Extension(extensionEnv);
}
}
