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io.strimzi.crdgenerator.DocGenerator Maven / Gradle / Ivy
/*
* Copyright Strimzi authors.
* License: Apache License 2.0 (see the file LICENSE or http://apache.org/licenses/LICENSE-2.0.html).
*/
package io.strimzi.crdgenerator;
import com.fasterxml.jackson.databind.JsonNode;
import io.fabric8.kubernetes.client.CustomResource;
import io.strimzi.api.annotations.ApiVersion;
import io.strimzi.api.annotations.DeprecatedProperty;
import io.strimzi.api.annotations.DeprecatedType;
import io.strimzi.crdgenerator.annotations.AddedIn;
import io.strimzi.crdgenerator.annotations.Crd;
import io.strimzi.crdgenerator.annotations.Description;
import io.strimzi.crdgenerator.annotations.DescriptionFile;
import io.strimzi.crdgenerator.annotations.KubeLink;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStreamWriter;
import java.lang.reflect.Method;
import java.nio.charset.StandardCharsets;
import java.util.ArrayList;
import java.util.Comparator;
import java.util.HashMap;
import java.util.HashSet;
import java.util.LinkedHashSet;
import java.util.List;
import java.util.Locale;
import java.util.Map;
import java.util.Set;
import java.util.regex.Pattern;
import java.util.stream.Collectors;
import static io.strimzi.crdgenerator.Property.discriminator;
import static io.strimzi.crdgenerator.Property.isPolymorphic;
import static io.strimzi.crdgenerator.Property.properties;
import static io.strimzi.crdgenerator.Property.subtypeMap;
import static io.strimzi.crdgenerator.Property.subtypeNames;
import static io.strimzi.crdgenerator.Property.subtypes;
import static java.util.Collections.emptySet;
import static java.util.Collections.singletonList;
class DocGenerator {
private static final String NL = System.lineSeparator();
private static final Pattern DOT_AT_THE_END = Pattern.compile(".*[.!?]$", Pattern.DOTALL);
private final int headerDepth;
private final Appendable out;
private final ApiVersion crApiVersion;
private final Set> documentedTypes = new HashSet<>();
private final HashMap, Set>> usedIn;
private final Linker linker;
private int numErrors = 0;
public DocGenerator(ApiVersion crApiVersion, int headerDepth, Iterable> crdClasses, Appendable out, Linker linker) {
this.crApiVersion = crApiVersion;
this.out = out;
this.headerDepth = headerDepth;
this.linker = linker;
this.usedIn = new HashMap<>();
for (Class crdClass: crdClasses) {
usedIn(crdClass, usedIn);
}
}
private void appendAnchor(Class anchor) throws IOException {
out.append("[id='").append(anchor(anchor)).append("']").append(NL);
}
private String anchor(Class anchor) {
return "type-" + anchor.getSimpleName() + "-{context}";
}
private void appendHeading(String name) throws IOException {
appendRepeated('=', headerDepth);
out.append(' ');
out.append(name);
out.append(" schema reference");
out.append(NL);
out.append(NL);
}
private void usedIn(Class cls, Map, Set>> usedIn) {
Set memorableProperties = new HashSet<>();
for (Property property : properties(crApiVersion, cls).values()) {
if (property.isAnnotationPresent(KubeLink.class)) {
continue;
}
memorableProperties.add(property);
}
for (Property property : memorableProperties) {
PropertyType propertyType = property.getType();
Class type = propertyType.isArray() ? propertyType.arrayBase() : propertyType.getType();
for (Class c : subtypesOrSelf(type)) {
if (Schema.isJsonScalarType(c)) {
continue;
}
Set> classes = getOrCreateClassesSet(c, usedIn);
classes.add(cls);
usedIn(c, usedIn);
}
}
}
private Set> getOrCreateClassesSet(Class c, Map, Set>> usedIn) {
return usedIn.computeIfAbsent(c, cls -> new HashSet<>(1));
}
private List> subtypesOrSelf(Class returnType) {
return isPolymorphic(returnType) ? subtypes(returnType) : singletonList(returnType);
}
public void generate(Class crdClass) throws IOException {
Crd crd = crdClass.getAnnotation(Crd.class);
appendAnchor(crdClass);
appendHeading("`" + crd.spec().names().kind() + "`");
appendCommonTypeDoc(crd, crdClass);
}
private void appendedNestedTypeDoc(Crd crd, Class cls) throws IOException {
appendAnchor(cls);
appendHeading("`" + cls.getSimpleName() + "`");
appendCommonTypeDoc(crd, cls);
}
private void appendCommonTypeDoc(Crd crd, Class cls) throws IOException {
appendTypeDeprecation(crd, cls);
appendUsedIn(crd, cls);
appendDescription(cls);
appendDiscriminator(crd, cls);
out.append("[cols=\"2,2,3a\",options=\"header\"]").append(NL);
out.append("|====").append(NL);
out.append("|Property |Property type |Description").append(NL);
LinkedHashSet> types = new LinkedHashSet<>();
for (Map.Entry entry : properties(crApiVersion, cls).entrySet()) {
String propertyName = entry.getKey();
final Property property = entry.getValue();
PropertyType propertyType = property.getType();
// Set the external link to Kubernetes docs or the link for fields distinguished by `type`
KubeLink kubeLink = property.getAnnotation(KubeLink.class);
String externalUrl = linker != null && kubeLink != null ? linker.link(kubeLink) : null;
// Add the property name
out.append("|").append(propertyName);
// Add the property type description
appendPropertyType(crd, out, propertyType, externalUrl);
// Set warning message for deprecated fields
addDeprecationWarning(property);
// Add the version the field was added in
addAddedIn(property);
// Add the types to the `types` array to also generate the docs for the type itself
Class documentedType = propertyType.isArray() ? propertyType.arrayBase() : propertyType.getType();
if (externalUrl == null
&& !Schema.isJsonScalarType(documentedType)
&& !documentedType.equals(Map.class)
&& !documentedType.equals(Object.class)) {
types.add(documentedType);
}
// Add the property description
addDescription(cls, property);
out.append(NL);
}
out.append("|====").append(NL).append(NL);
appendNestedTypes(crd, types);
}
/**
* Sets warning message for deprecated fields
*
* @param property The property which will be checked for deprecation
*
* @throws IOException Throws IOException when appending to the output fails
*/
private void addDeprecationWarning(Property property) throws IOException {
DeprecatedProperty strimziDeprecated = property.getAnnotation(DeprecatedProperty.class);
Deprecated langDeprecated = property.getAnnotation(Deprecated.class);
if (strimziDeprecated != null || langDeprecated != null) {
if (strimziDeprecated == null || langDeprecated == null) {
err(property + " must be annotated with both @" + Deprecated.class.getName()
+ " and @" + DeprecatedProperty.class.getName());
}
if (strimziDeprecated != null) {
out.append(getDeprecation(property, strimziDeprecated));
}
}
}
/**
* Sets the description for given property
*
* @param cls The Class (type) which is being documented
* @param property The property for which the description should be added
*
* @throws IOException Throws IOException when appending to the output fails
*/
private void addDescription(Class cls, Property property) throws IOException {
Description description = property.getAnnotation(Description.class);
if (description == null) {
if (cls.getName().startsWith("io.strimzi")) {
err(property + " is not documented");
}
} else {
out.append(getDescription(description));
}
}
/**
* Sets the version in which the property was added. It is done only for properties that have the AddedIn annotation.
*
* @param property The property for which the version should be added
*
* @throws IOException Throws IOException when appending to the output fails
*/
private void addAddedIn(Property property) throws IOException {
AddedIn addedIn = property.getAnnotation(AddedIn.class);
if (addedIn != null) {
out.append("Added in Strimzi " + addedIn.value() + ". ");
}
}
/**
* Sets the external link to Kubernetes docs or the link for fields distinguished by `type`
*
* @param property The property for which the description should be added
* @param kubeLink The value of the KubeLink annotation or null if not set
* @param externalUrl The URL to the Kubernetes documentation
*
* @throws IOException Throws IOException when appending to the output fails
*/
private void addExternalUrl(Property property, KubeLink kubeLink, String externalUrl) throws IOException {
if (externalUrl != null) {
out.append(" For more information, see the ").append(externalUrl)
.append("[").append("external documentation for ").append(kubeLink.group()).append("/").append(kubeLink.version()).append(" ").append(kubeLink.kind()).append("].").append(NL).append(NL);
} else if (isPolymorphic(property.getType().getType())) {
out.append(" The type depends on the value of the `").append(property.getName()).append(".").append(discriminator(property.getType().getType()))
.append("` property within the given object, which must be one of ")
.append(subtypeNames(property.getType().getType()).toString()).append(".");
}
}
private String getDeprecation(Property property, DeprecatedProperty deprecated) {
String msg = String.format("**The `%s` property has been deprecated",
property.getName());
if (!deprecated.movedToPath().isEmpty()) {
msg += ", and should now be configured using `" + deprecated.movedToPath() + "`";
}
if (!deprecated.removalVersion().isEmpty()) {
msg += ". The property " + property.getName() + " is removed in API version `" + deprecated.removalVersion() + "`";
}
msg += ".** ";
if (!deprecated.description().isEmpty()) {
msg += deprecated.description() + " ";
}
return msg;
}
static String getDescription(Description description) {
String doc = description.value();
if (!DOT_AT_THE_END.matcher(doc.trim()).matches()) {
doc = doc + ".";
}
doc = doc.replaceAll("[|]", "\\\\|");
return doc;
}
private void err(String s) {
System.err.println(DocGenerator.class.getSimpleName() + ": error: " + s);
numErrors++;
}
private void appendNestedTypes(Crd crd, LinkedHashSet> types) throws IOException {
for (Class type : types) {
for (Class t2 : subtypesOrSelf(type)) {
if (!documentedTypes.contains(t2)) {
appendedNestedTypeDoc(crd, t2);
this.documentedTypes.add(t2);
}
}
}
}
@SuppressWarnings("unchecked")
private void appendPropertyType(Crd crd, Appendable out, PropertyType propertyType, String externalUrl) throws IOException {
Class propertyClass = propertyType.isArray() ? propertyType.arrayBase() : propertyType.getType();
out.append(NL);
out.append("|");
// Now the type link
if (externalUrl != null) {
out.append(externalUrl).append("[").append(propertyClass.getSimpleName()).append("]");
} else if (propertyType.isEnum()) {
Set strings = new HashSet<>();
for (JsonNode n : Schema.enumCases(propertyType.getEnumElements())) {
if (n.isTextual()) {
strings.add(n.asText());
} else {
throw new RuntimeException("Enum case is not a string");
}
}
out.append("string (one of " + strings + ")");
} else if (propertyType.isArray() && propertyType.arrayBase().isEnum()) {
try {
Set strings = new HashSet<>();
Method valuesMethod = propertyType.arrayBase().getMethod("values");
for (JsonNode n : Schema.enumCases((Enum[]) valuesMethod.invoke(null))) {
if (n.isTextual()) {
strings.add(n.asText());
} else {
throw new RuntimeException("Enum case is not a string");
}
}
out.append("string (one or more of " + strings + ")");
} catch (ReflectiveOperationException e) {
throw new RuntimeException(e);
}
} else {
typeLink(crd, out, propertyClass);
}
if (propertyType.isArray()) {
out.append(" array");
int dim = propertyType.arrayDimension();
if (dim > 1) {
out.append(" of dimension ").append(String.valueOf(dim));
}
}
out.append(NL);
out.append("|");
}
private void appendTypeDeprecation(Crd crd, Class cls) throws IOException {
DeprecatedType deprecatedType = cls.getAnnotation(DeprecatedType.class);
Deprecated langDeprecated = cls.getAnnotation(Deprecated.class);
if (deprecatedType != null || langDeprecated != null) {
if (deprecatedType == null || langDeprecated == null) {
err(cls.getName() + " must be annotated with both @" + Deprecated.class.getName()
+ " and @" + DeprecatedType.class.getName());
}
if (deprecatedType != null
&& deprecatedType.replacedWithType() != null) {
Class replacementClss = deprecatedType.replacedWithType();
out.append("*The type `" + cls.getSimpleName() + "` has been deprecated");
if (!deprecatedType.removalVersion().isEmpty()) {
out.append(" and is removed in API version `" + deprecatedType.removalVersion() + "`");
}
out.append(".*").append(NL);
if (replacementClss != void.class) {
out.append("Please use ");
typeLink(crd, out, replacementClss);
out.append(" instead.").append(NL);
}
out.append(NL);
}
}
}
private void appendDescription(Class cls) throws IOException {
DescriptionFile descriptionFile = cls.getAnnotation(DescriptionFile.class);
Description description = cls.getAnnotation(Description.class);
if (descriptionFile != null) {
String filename = "api/" + cls.getCanonicalName() + ".adoc";
File includeFile = new File(filename);
if (!includeFile.isFile()) {
throw new RuntimeException("Class " + cls.getCanonicalName() + " has @DescriptionFile annotation, but file " + filename + " does not exist!");
}
out.append("xref:type-").append(cls.getSimpleName()).append("-schema-{context}[Full list of `").append(cls.getSimpleName()).append("` schema properties]").append(NL);
out.append(NL);
out.append("include::../" + filename + "[leveloffset=+1]").append(NL);
out.append(NL);
out.append("[id='type-").append(cls.getSimpleName()).append("-schema-{context}']").append(NL);
out.append("== `").append(cls.getSimpleName()).append("` schema properties").append(NL);
out.append(NL);
} else if (description != null) {
out.append(getDescription(description)).append(NL);
}
out.append(NL);
}
private void appendUsedIn(Crd crd, Class cls) throws IOException {
List> usedIn = new ArrayList<>(this.usedIn.getOrDefault(cls, emptySet()));
usedIn.sort(Comparator.comparing(c -> c.getSimpleName().toLowerCase(Locale.ENGLISH)));
if (!usedIn.isEmpty()) {
out.append("Used in: ");
boolean first = true;
for (Class usingClass : usedIn) {
if (!first) {
out.append(", ");
}
typeLink(crd, out, usingClass);
first = false;
}
out.append(NL);
out.append(NL);
}
}
private void appendDiscriminator(Crd crd, Class cls) throws IOException {
String discriminator = discriminator(cls.getSuperclass());
if (discriminator != null) {
String subtypeLinks = subtypes(cls.getSuperclass()).stream().filter(c -> !c.equals(cls)).map(c -> {
try {
return typeLink(crd, c);
} catch (IOException e) {
throw new RuntimeException(e);
}
}).collect(Collectors.joining(", "));
out.append("The `").append(discriminator)
.append("` property is a discriminator that distinguishes use of the `")
.append(cls.getSimpleName()).append("` type from ");
if (subtypeLinks.trim().isEmpty()) {
out.append("other subtypes which may be added in the future.");
} else {
out.append(subtypeLinks).append(".");
}
out.append(NL);
out.append("It must have the value `").append(subtypeMap(cls.getSuperclass()).get(cls)).append("` for the type `").append(cls.getSimpleName()).append("`.").append(NL);
}
}
private void appendRepeated(char c, int num) throws IOException {
for (int i = 0; i < num; i++) {
out.append(c);
}
}
public void typeLink(Crd crd, Appendable out, Class cls) throws IOException {
if (short.class.equals(cls)
|| Short.class.equals(cls)
|| int.class.equals(cls)
|| Integer.class.equals(cls)
|| long.class.equals(cls)
|| Long.class.equals(cls)) {
out.append("integer");
} else if (Float.class.equals(cls)
|| float.class.equals(cls)
|| Double.class.equals(cls)
|| double.class.equals(cls)) {
out.append("number");
} else if (Object.class.equals(cls)
|| String.class.equals(cls)
|| Map.class.equals(cls)
|| Boolean.class.equals(cls)
|| boolean.class.equals(cls)) {
out.append(cls.getSimpleName().toLowerCase(Locale.ENGLISH));
} else if (isPolymorphic(cls)) {
out.append(subtypes(cls).stream().map(c -> {
try {
return typeLink(crd, c);
} catch (IOException e) {
throw new RuntimeException(e);
}
}).collect(Collectors.joining(", ")));
} else {
out.append("xref:").append(anchor(cls)).append("[`").append(cls.getSimpleName()).append("`]");
}
}
public String typeLink(Crd crd, Class cls) throws IOException {
StringBuilder sb = new StringBuilder();
typeLink(crd, sb, cls);
return sb.toString();
}
public static void main(String[] args) throws IOException, ClassNotFoundException {
Linker linker = null;
File out = null;
List> classes = new ArrayList<>();
for (int i = 0; i < args.length; i++) {
String arg = args[i];
if (arg.startsWith("-")) {
if ("--linker".equals(arg)) {
String className = args[++i];
Class linkerClass = classInherits(Class.forName(className), Linker.class);
if (linkerClass != null) {
try {
linker = linkerClass.getConstructor(String.class).newInstance(args[++i]);
} catch (ReflectiveOperationException e) {
throw new RuntimeException("--linker option can't be handled", e);
}
} else {
System.err.println(className + " is not a subclass of " + Linker.class.getName());
}
} else {
throw new RuntimeException("Unsupported option " + arg);
}
} else {
if (out == null) {
out = new File(arg);
} else {
// If we have fallen in the else branch here, the arg has to be a class name
Class cls = classInherits(Class.forName(arg), CustomResource.class);
if (cls != null) {
classes.add(cls);
} else {
System.err.println(arg + " is not a subclass of " + CustomResource.class.getName());
}
}
}
}
ApiVersion crApiVersion = ApiVersion.V1BETA2;
try (OutputStreamWriter writer = new OutputStreamWriter(new FileOutputStream(out), StandardCharsets.UTF_8)) {
writer.append("// This file is auto-generated by ")
.append(DocGenerator.class.getName())
.append(".").append(NL);
writer.append("// To change this documentation you need to edit the Java sources.").append(NL);
writer.append(NL);
DocGenerator dg = new DocGenerator(crApiVersion, 1, classes, writer, linker);
for (Class c : classes) {
dg.generate(c);
}
if (dg.numErrors > 0) {
System.err.println("There were " + dg.numErrors + " errors");
System.exit(1);
}
}
}
@SuppressWarnings("unchecked")
static Class classInherits(Class cls, Class test) {
if (test.isAssignableFrom(cls)) {
return (Class) cls;
}
return null;
}
}
