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package com.indeed.proctor.common;
import com.google.common.annotations.VisibleForTesting;
import com.google.common.base.Preconditions;
import com.google.common.base.Supplier;
import com.google.common.collect.ImmutableList;
import com.indeed.proctor.common.dynamic.DynamicFilters;
import com.indeed.proctor.common.model.Audit;
import com.indeed.proctor.common.model.TestMatrixArtifact;
import com.indeed.util.core.DataLoadingTimerTask;
import com.indeed.util.varexport.Export;
import com.indeed.util.varexport.ManagedVariable;
import com.indeed.util.varexport.VarExporter;
import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;
import javax.annotation.CheckForNull;
import javax.annotation.Nonnull;
import javax.annotation.Nullable;
import javax.el.FunctionMapper;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Collections;
import java.util.HashSet;
import java.util.List;
import java.util.Map;
import java.util.Set;
public abstract class AbstractProctorLoader extends DataLoadingTimerTask
implements Supplier {
private static final Logger LOGGER = LogManager.getLogger(AbstractProctorLoader.class);
protected static final VarExporter VAR_EXPORTER =
VarExporter.forNamespace(AbstractProctorLoader.class.getSimpleName()).includeInGlobal();
@Nullable protected final Map requiredTests;
@Nullable private Proctor current = null;
@Nullable private Audit lastAudit = null;
@Nullable private String lastLoadErrorMessage = "load never attempted";
private Set loggedDynamicTests;
@Nonnull private final FunctionMapper functionMapper;
@Nonnull private final IdentifierValidator identifierValidator;
private final ProvidedContext providedContext;
protected final DynamicFilters dynamicFilters;
private final List reporters = new ArrayList<>();
public AbstractProctorLoader(
@Nonnull final Class cls,
@Nonnull final ProctorSpecification specification,
@Nonnull final FunctionMapper functionMapper) {
this(cls, specification, functionMapper, new IdentifierValidator.Noop());
loggedDynamicTests = new HashSet<>();
}
/**
* @param cls name will be used as namespace for timer
* @param specification provides tests, context, dynamic filters
* @param functionMapper evaluates functions in allocation rules
* @param identifierValidator validates for preventing unintended activation of tests
*/
public AbstractProctorLoader(
@Nonnull final Class cls,
@Nonnull final ProctorSpecification specification,
@Nonnull final FunctionMapper functionMapper,
@Nonnull final IdentifierValidator identifierValidator) {
super(cls.getSimpleName());
this.requiredTests = specification.getTests();
this.providedContext = createProvidedContext(specification);
if (!this.providedContext.shouldEvaluate()) {
LOGGER.debug(
"providedContext Objects missing necessary functions for validation, rules will not be tested.");
}
this.functionMapper = functionMapper;
this.identifierValidator = identifierValidator;
this.dynamicFilters = specification.getDynamicFilters();
loggedDynamicTests = new HashSet<>();
}
/**
* user can override this function to provide a context for rule verification
*
* @return a context for rule verification
*/
protected Map getRuleVerificationContext() {
return Collections.emptyMap();
}
protected ProvidedContext createProvidedContext(final ProctorSpecification specification) {
return ProctorUtils.convertContextToTestableMap(
specification.getProvidedContext(), getRuleVerificationContext());
}
@CheckForNull
abstract TestMatrixArtifact loadTestMatrix()
throws IOException, MissingTestMatrixException, TestMatrixOutdatedException;
/** @return informative String for log/error messages */
@Nonnull
abstract String getSource();
@Override
public boolean load() {
final Proctor newProctor;
try {
newProctor = doLoad();
} catch (@Nonnull final Throwable t) {
reportFailed(t);
lastLoadErrorMessage = t.getMessage();
throw new RuntimeException("Unable to reload proctor from " + getSource(), t);
}
lastLoadErrorMessage = null;
if (newProctor == null) {
// This should only happen if the versions of the matrix files are the same.
reportNoChange();
return true; // mark this cycle as success so that healthcheck recovers
}
reportReloaded(current, newProctor);
current = newProctor;
final Audit lastAudit = Preconditions.checkNotNull(this.lastAudit, "Missing last audit");
setDataVersion(
lastAudit.getVersion()
+ " @ "
+ lastAudit.getUpdated()
+ " by "
+ lastAudit.getUpdatedBy());
LOGGER.info(
"Successfully loaded new test matrix definition: "
+ lastAudit.getVersion()
+ " @ "
+ lastAudit.getUpdated()
+ " by "
+ lastAudit.getUpdatedBy());
return true;
}
@CheckForNull
public Proctor doLoad() throws IOException, MissingTestMatrixException {
final TestMatrixArtifact testMatrix;
try {
testMatrix = loadTestMatrix();
if (testMatrix == null) {
throw new MissingTestMatrixException(
"Failed to load Test Matrix from " + getSource());
}
} catch (final TestMatrixOutdatedException e) {
return null;
}
final Set dynamicTests =
dynamicFilters.determineTests(testMatrix.getTests(), requiredTests.keySet());
exportDynamicTests(dynamicTests);
// modify testMatrix
final ProctorLoadResult loadResult =
ProctorUtils.verifyAndConsolidate(
testMatrix,
getSource(),
requiredTests,
functionMapper,
providedContext,
dynamicTests);
loadResult
.getTestErrorMap()
.forEach(
(testName, exception) -> {
LOGGER.error(
String.format(
"Unable to load test matrix for a required test %s",
testName),
exception);
});
loadResult
.getMissingTests()
.forEach(
(testName) ->
LOGGER.error(
String.format(
"A required test %s is missing from test matrix",
testName)));
loadResult.getDynamicTestErrorMap().forEach(this::logDynamicTests);
final Audit newAudit = testMatrix.getAudit();
if (lastAudit != null) {
final Audit audit = Preconditions.checkNotNull(newAudit, "Missing audit");
if (lastAudit.getVersion().equals(audit.getVersion())) {
if (LOGGER.isDebugEnabled()) {
LOGGER.debug(
"Not reloading "
+ getSource()
+ " test matrix definition because audit is unchanged: "
+ lastAudit.getVersion()
+ " @ "
+ lastAudit.getUpdated()
+ " by "
+ lastAudit.getUpdatedBy());
}
return null;
}
}
final Proctor proctor =
Proctor.construct(testMatrix, loadResult, functionMapper, identifierValidator);
// kind of lame to modify lastAudit here but current in load(), but the interface is a
// little constraining
setLastAudit(newAudit);
return proctor;
}
@VisibleForTesting
protected void logDynamicTests(final String testName, final Exception exception) {
if (!loggedDynamicTests.contains(testName)) {
// Intentionally not adding stack trace to log, to reduce log size,
// message contains all the information that is valuable.
LOGGER.warn(
String.format(
"Unable to load test matrix for a dynamic test %s. Cause: %s Message: %s",
testName, exception.getCause(), exception.getMessage()));
loggedDynamicTests.add(testName);
}
}
@VisibleForTesting
public Set getLoggedDynamicTests() {
return loggedDynamicTests;
}
@CheckForNull
public Proctor get() {
return current;
}
@CheckForNull
@Export(name = "last-audit")
public Audit getLastAudit() {
return lastAudit;
}
@VisibleForTesting
void setLastAudit(final Audit newAudit) {
lastAudit = newAudit;
}
@CheckForNull
@Export(
name = "last-error",
doc = "The last error message thrown by the loader. null indicates a successful load.")
public String getLastLoadErrorMessage() {
return lastLoadErrorMessage;
}
// this can be used in subclasses for healthchecks
/** @return true if there was a success and it came after the last error */
public boolean isLoadedDataSuccessfullyRecently() {
// most dataLoadTimer methods already exposed in parent class DataLoadingTimerTask
return dataLoadTimer.isLoadedDataSuccessfullyRecently();
}
/**
* this is used to provide custom reporting of changes in the tests, e.g. reporting to datadog
*
* @param diffReporter a reporter to report change of new proctor
* @deprecated use {@link AbstractProctorLoader#addLoadReporter}
*/
@SuppressWarnings({"UnusedDeclaration"})
@Deprecated
public void setDiffReporter(@Nonnull final AbstractProctorDiffReporter diffReporter) {
addLoadReporter(diffReporter);
}
public void addLoadReporter(@Nonnull final ProctorLoadReporter diffReporter) {
Preconditions.checkNotNull(diffReporter, "ProctorLoadReporter can't be null");
addLoadReporter(ImmutableList.of(diffReporter));
}
public void addLoadReporter(@Nonnull final List newReporters) {
Preconditions.checkNotNull(newReporters, "new reporters shouldn't be empty");
reporters.addAll(newReporters);
}
void reportFailed(final Throwable t) {
for (final ProctorLoadReporter reporter : reporters) {
reporter.reportFailed(t);
}
}
void reportReloaded(final Proctor oldProctor, final Proctor newProctor) {
for (final ProctorLoadReporter reporter : reporters) {
reporter.reportReloaded(oldProctor, newProctor);
}
}
void reportNoChange() {
for (final ProctorLoadReporter reporter : reporters) {
reporter.reportNoChange();
}
}
protected void exportDynamicTests(final Set dynamicTests) {
final ManagedVariable> managedVariable =
ManagedVariable.>builder()
.setName("dynamic-tests")
.setValue(dynamicTests)
.build();
VAR_EXPORTER.export(managedVariable);
}
}
