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Bzlmod: Allow multiple use_extensions on the same extension (bazelb…
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…uild#14945)

Fixes bazelbuild#14635.

PiperOrigin-RevId: 432155351
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Wyverald authored Mar 3, 2022
1 parent c45838b commit 764614e
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Showing 3 changed files with 87 additions and 18 deletions.
Original file line number Diff line number Diff line change
Expand Up @@ -31,7 +31,11 @@ public abstract class ModuleExtensionUsage {
/** The name of the extension. */
public abstract String getExtensionName();

/** The location where this proxy object was created (by the {@code use_extension} call). */
/**
* The location where this proxy object was created (by the {@code use_extension} call). Note that
* if there were multiple {@code use_extension} calls on same extension, then this only stores the
* location of the first one.
*/
public abstract Location getLocation();

/**
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Original file line number Diff line number Diff line change
Expand Up @@ -273,20 +273,25 @@ public void bazelDep(
public ModuleExtensionProxy useExtension(
String extensionBzlFile, String extensionName, boolean devDependency, StarlarkThread thread)
throws EvalException {
ModuleExtensionProxy newProxy =
new ModuleExtensionProxy(extensionBzlFile, extensionName, thread.getCallerLocation());

if (ignoreDevDeps && devDependency) {
// This is a no-op proxy.
return newProxy;
}

// Find an existing proxy object corresponding to this extension.
for (ModuleExtensionProxy proxy : extensionProxies) {
if (proxy.extensionBzlFile.equals(extensionBzlFile)
&& proxy.extensionName.equals(extensionName)) {
throw Starlark.errorf("this extension is already being used at %s", proxy.location);
return proxy;
}
}
ModuleExtensionProxy proxy =
new ModuleExtensionProxy(extensionBzlFile, extensionName, thread.getCallerLocation());

if (!(ignoreDevDeps && devDependency)) {
extensionProxies.add(proxy);
}

return proxy;
// If no such proxy exists, we can just use a new one.
extensionProxies.add(newProxy);
return newProxy;
}

@StarlarkBuiltin(name = "module_extension_proxy", documented = false)
Expand Down Expand Up @@ -368,9 +373,7 @@ public String getErrorMessageForUnknownField(String field) {
parameters = {
@Param(
name = "extension_proxy",
doc =
"A module extension proxy object returned by a <code>get_module_extension</code>"
+ " call."),
doc = "A module extension proxy object returned by a <code>use_extension</code> call."),
},
extraPositionals = @Param(name = "args", doc = "The names of the repos to import."),
extraKeywords =
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Original file line number Diff line number Diff line change
Expand Up @@ -499,21 +499,83 @@ public void testModuleExtensions_good() throws Exception {
}

@Test
public void testModuleExtensions_duplicateProxy() throws Exception {
public void testModuleExtensions_duplicateProxy_asRoot() throws Exception {
scratch.file(
rootDirectory.getRelative("MODULE.bazel").getPathString(),
"myext1 = use_extension('//:defs.bzl','myext',dev_dependency=True)",
"use_repo(myext1, 'alpha')",
"myext2 = use_extension('//:defs.bzl','myext')",
"use_repo(myext2, 'beta')",
"myext3 = use_extension('//:defs.bzl','myext',dev_dependency=True)",
"use_repo(myext3, 'gamma')",
"myext4 = use_extension('//:defs.bzl','myext')",
"use_repo(myext4, 'delta')");
ModuleFileFunction.REGISTRIES.set(differencer, ImmutableList.of());

SkyKey skyKey = ModuleFileValue.KEY_FOR_ROOT_MODULE;
EvaluationResult<ModuleFileValue> result =
driver.evaluate(ImmutableList.of(skyKey), evaluationContext);
if (result.hasError()) {
throw result.getError().getException();
}
ModuleFileValue moduleFileValue = result.get(skyKey);
assertThat(moduleFileValue.getModule())
.isEqualTo(
Module.builder()
.setKey(ModuleKey.ROOT)
.addExtensionUsage(
ModuleExtensionUsage.builder()
.setExtensionBzlFile("//:defs.bzl")
.setExtensionName("myext")
.setLocation(Location.fromFileLineColumn("<root>/MODULE.bazel", 1, 23))
.setImports(
ImmutableBiMap.of(
"alpha", "alpha", "beta", "beta", "gamma", "gamma", "delta",
"delta"))
.build())
.build());
}

@Test
public void testModuleExtensions_duplicateProxy_asDep() throws Exception {
FakeRegistry registry =
registryFactory
.newFakeRegistry("/foo")
.addModule(
createModuleKey("mymod", "1.0"),
"module(name='mymod',version='1.0')",
"myext1 = use_extension('//:defs.bzl','myext')",
"myext2 = use_extension('//:defs.bzl','myext')");
"myext1 = use_extension('//:defs.bzl','myext',dev_dependency=True)",
"use_repo(myext1, 'alpha')",
"myext2 = use_extension('//:defs.bzl','myext')",
"use_repo(myext2, 'beta')",
"myext3 = use_extension('//:defs.bzl','myext',dev_dependency=True)",
"use_repo(myext3, 'gamma')",
"myext4 = use_extension('//:defs.bzl','myext')",
"use_repo(myext4, 'delta')");
ModuleFileFunction.REGISTRIES.set(differencer, ImmutableList.of(registry.getUrl()));

SkyKey skyKey = ModuleFileValue.key(createModuleKey("mymod", "1.0"), null);
reporter.removeHandler(failFastHandler); // expect failures
driver.evaluate(ImmutableList.of(skyKey), evaluationContext);
assertContainsEvent("this extension is already being used at");
EvaluationResult<ModuleFileValue> result =
driver.evaluate(ImmutableList.of(skyKey), evaluationContext);
if (result.hasError()) {
throw result.getError().getException();
}
ModuleFileValue moduleFileValue = result.get(skyKey);
assertThat(moduleFileValue.getModule())
.isEqualTo(
Module.builder()
.setName("mymod")
.setVersion(Version.parse("1.0"))
.setKey(createModuleKey("mymod", "1.0"))
.setRegistry(registry)
.addExtensionUsage(
ModuleExtensionUsage.builder()
.setExtensionBzlFile("//:defs.bzl")
.setExtensionName("myext")
.setLocation(Location.fromFileLineColumn("[email protected]/MODULE.bazel", 4, 23))
.setImports(ImmutableBiMap.of("beta", "beta", "delta", "delta"))
.build())
.build());
}

@Test
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