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1274 lines (1106 loc) · 35.9 KB
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/*
* Jooby https://jooby.io
* Apache License Version 2.0 https://jooby.io/LICENSE.txt
* Copyright 2014 Edgar Espina
*/
package io.jooby.internal;
import java.util.Arrays;
import java.util.Map;
import java.util.Objects;
import java.util.concurrent.ConcurrentHashMap;
import java.util.regex.Pattern;
import java.util.stream.Collectors;
import java.util.stream.Stream;
import io.jooby.MessageEncoder;
import io.jooby.Route;
import io.jooby.Router;
/** Sync: May 22, 2020 Commit: 5704d7ee98edd3fe55169b506531bdd061667c70 */
class Chi implements RouteTree {
private static final String EMPTY_STRING = "";
private static final Slice EMPTY_SLICE = new Slice(EMPTY_STRING);
private static final byte ntStatic = 0; // /home
private static final byte ntRegexp = 1; // /{id:[0-9]+}
private static final byte ntParam = 2; // /{user}
private static final byte ntCatchAll = 3; // /api/v1/*
private static final int NODE_SIZE = ntCatchAll + 1;
static final char ZERO_CHAR = Character.MIN_VALUE;
private MessageEncoder encoder;
/** Avoid string allocation */
private static class Slice implements CharSequence {
private final String base;
private final int startIndex;
private final int endIndex;
public Slice(String base, int startIndex, int endIndex) {
this.base = base;
this.startIndex = startIndex;
this.endIndex = endIndex;
}
public Slice(String base, int startIndex) {
this(base, startIndex, base.length());
}
public Slice(String base) {
this(base, 0);
}
@Override
public int length() {
return endIndex - startIndex;
}
@Override
public char charAt(int index) {
return base.charAt(startIndex + index);
}
@Override
public Slice subSequence(int start, int end) {
return new Slice(base, startIndex + start, startIndex + end);
}
@Override
public String toString() {
return base.substring(startIndex, endIndex);
}
public Slice substring(int start) {
return substring(start, length());
}
public Slice substring(int start, int end) {
return subSequence(start, end);
}
public int indexOf(int ch) {
for (int i = startIndex; i < endIndex; i++) {
if (base.charAt(i) == ch) {
return i - startIndex;
}
}
return -1;
}
public boolean startsWith(String prefix) {
int len = prefix.length();
if (len <= length()) {
for (int i = 0; i < len; i++) {
if (base.charAt(i + startIndex) != prefix.charAt(i)) {
return false;
}
}
return true;
}
return false;
}
}
private interface StaticMap {
StaticMap INIT =
new StaticMap() {
@Override
public StaticRoute get(String path) {
return null;
}
@Override
public StaticMap put(String path, StaticRoute staticRoute) {
return new StaticMap1(path, staticRoute);
}
};
StaticRoute get(String path);
StaticMap put(String path, StaticRoute staticRoute);
}
private static class StaticMap1 implements StaticMap {
private String pattern;
private StaticRoute route;
public StaticMap1(String pattern, StaticRoute route) {
this.pattern = pattern;
this.route = route;
}
@Override
public StaticMap put(String path, StaticRoute route) {
if (pattern.equals(path)) {
// Override
this.route = route;
return this;
}
return new StaticMap2(this, path, route);
}
public void release() {
this.pattern = null;
this.route = null;
}
public StaticRoute get(String path) {
if (pattern.equals(path)) {
return route;
} else {
return null;
}
}
}
private static class StaticMap2 implements StaticMap {
private String pattern1;
private StaticRoute route1;
private String pattern2;
private StaticRoute route2;
public StaticMap2(StaticMap1 staticMap, String path, StaticRoute route) {
this.pattern1 = staticMap.pattern;
this.route1 = staticMap.route;
this.pattern2 = path;
this.route2 = route;
staticMap.release();
}
public void release() {
this.pattern1 = null;
this.route1 = null;
this.pattern2 = null;
this.route2 = null;
}
@Override
public StaticMap put(String path, StaticRoute route) {
if (pattern1.equals(path)) {
route1 = route;
return this;
} else if (pattern2.equals(path)) {
route2 = route;
return this;
}
return new StaticMap3(this, path, route);
}
public StaticRoute get(String path) {
if (pattern1.equals(path)) {
return route1;
} else if (pattern2.equals(path)) {
return route2;
} else {
return null;
}
}
}
private static class StaticMap3 implements StaticMap {
private String pattern1;
private StaticRoute route1;
private String pattern2;
private StaticRoute route2;
private String pattern3;
private StaticRoute route3;
public StaticMap3(StaticMap2 staticMap, String path, StaticRoute route) {
this.pattern1 = staticMap.pattern1;
this.route1 = staticMap.route1;
this.pattern2 = staticMap.pattern2;
this.route2 = staticMap.route2;
this.pattern3 = path;
this.route3 = route;
staticMap.release();
}
public void release() {
this.pattern1 = null;
this.route1 = null;
this.pattern2 = null;
this.route2 = null;
this.pattern3 = null;
this.route3 = null;
}
@Override
public StaticMap put(String path, StaticRoute route) {
if (pattern1.equals(path)) {
route1 = route;
return this;
} else if (pattern2.equals(path)) {
route2 = route;
return this;
} else if (pattern3.equals(path)) {
route3 = route;
return this;
}
return new StaticMap4(this, path, route);
}
public StaticRoute get(String path) {
if (pattern1.equals(path)) {
return route1;
} else if (pattern2.equals(path)) {
return route2;
} else if (pattern3.equals(path)) {
return route3;
} else {
return null;
}
}
}
private static class StaticMap4 implements StaticMap {
private String pattern1;
private StaticRoute route1;
private String pattern2;
private StaticRoute route2;
private String pattern3;
private StaticRoute route3;
private String pattern4;
private StaticRoute route4;
public StaticMap4(StaticMap3 staticMap, String path, StaticRoute route) {
this.pattern1 = staticMap.pattern1;
this.route1 = staticMap.route1;
this.pattern2 = staticMap.pattern2;
this.route2 = staticMap.route2;
this.pattern3 = staticMap.pattern3;
this.route3 = staticMap.route3;
this.pattern4 = path;
this.route4 = route;
staticMap.release();
}
public void release() {
this.pattern1 = null;
this.route1 = null;
this.pattern2 = null;
this.route2 = null;
this.pattern3 = null;
this.route3 = null;
this.pattern4 = null;
this.route4 = null;
}
@Override
public StaticMap put(String path, StaticRoute route) {
if (pattern1.equals(path)) {
route1 = route;
return this;
} else if (pattern2.equals(path)) {
route2 = route;
return this;
} else if (pattern3.equals(path)) {
route3 = route;
return this;
} else if (pattern4.equals(path)) {
route4 = route;
return this;
}
return new StaticMap5(this, path, route);
}
public StaticRoute get(String path) {
if (pattern1.equals(path)) {
return route1;
} else if (pattern2.equals(path)) {
return route2;
} else if (pattern3.equals(path)) {
return route3;
} else if (pattern4.equals(path)) {
return route4;
} else {
return null;
}
}
}
private static class StaticMap5 implements StaticMap {
private String pattern1;
private StaticRoute route1;
private String pattern2;
private StaticRoute route2;
private String pattern3;
private StaticRoute route3;
private String pattern4;
private StaticRoute route4;
private String pattern5;
private StaticRoute route5;
public StaticMap5(StaticMap4 staticMap, String path, StaticRoute route) {
this.pattern1 = staticMap.pattern1;
this.route1 = staticMap.route1;
this.pattern2 = staticMap.pattern2;
this.route2 = staticMap.route2;
this.pattern3 = staticMap.pattern3;
this.route3 = staticMap.route3;
this.pattern4 = staticMap.pattern4;
this.route4 = staticMap.route4;
this.pattern5 = path;
this.route5 = route;
staticMap.release();
}
public void release() {
this.pattern1 = null;
this.route1 = null;
this.pattern2 = null;
this.route2 = null;
this.pattern3 = null;
this.route3 = null;
this.pattern4 = null;
this.route4 = null;
this.pattern5 = null;
this.route5 = null;
}
@Override
public StaticMap put(String path, StaticRoute route) {
if (pattern1.equals(path)) {
route1 = route;
return this;
} else if (pattern2.equals(path)) {
route2 = route;
return this;
} else if (pattern3.equals(path)) {
route3 = route;
return this;
} else if (pattern4.equals(path)) {
route4 = route;
return this;
} else if (pattern5.equals(path)) {
route5 = route;
return this;
}
return new StaticMap6(this, path, route);
}
public StaticRoute get(String path) {
if (pattern1.equals(path)) {
return route1;
} else if (pattern2.equals(path)) {
return route2;
} else if (pattern3.equals(path)) {
return route3;
} else if (pattern4.equals(path)) {
return route4;
} else if (pattern5.equals(path)) {
return route5;
} else {
return null;
}
}
}
private static class StaticMap6 implements StaticMap {
private String pattern1;
private StaticRoute route1;
private String pattern2;
private StaticRoute route2;
private String pattern3;
private StaticRoute route3;
private String pattern4;
private StaticRoute route4;
private String pattern5;
private StaticRoute route5;
private String pattern6;
private StaticRoute route6;
public StaticMap6(StaticMap5 staticMap, String path, StaticRoute route) {
this.pattern1 = staticMap.pattern1;
this.route1 = staticMap.route1;
this.pattern2 = staticMap.pattern2;
this.route2 = staticMap.route2;
this.pattern3 = staticMap.pattern3;
this.route3 = staticMap.route3;
this.pattern4 = staticMap.pattern4;
this.route4 = staticMap.route4;
this.pattern5 = staticMap.pattern5;
this.route5 = staticMap.route5;
this.pattern6 = path;
this.route6 = route;
staticMap.release();
}
public void release() {
this.pattern1 = null;
this.route1 = null;
this.pattern2 = null;
this.route2 = null;
this.pattern3 = null;
this.route3 = null;
this.pattern4 = null;
this.route4 = null;
this.pattern5 = null;
this.route5 = null;
this.pattern6 = null;
this.route6 = null;
}
@Override
public StaticMap put(String path, StaticRoute route) {
if (pattern1.equals(path)) {
route1 = route;
return this;
} else if (pattern2.equals(path)) {
route2 = route;
return this;
} else if (pattern3.equals(path)) {
route3 = route;
return this;
} else if (pattern4.equals(path)) {
route4 = route;
return this;
} else if (pattern5.equals(path)) {
route5 = route;
return this;
} else if (pattern6.equals(path)) {
route6 = route;
}
return new StaticMapN(this, path, route);
}
public StaticRoute get(String path) {
if (pattern1.equals(path)) {
return route1;
} else if (pattern2.equals(path)) {
return route2;
} else if (pattern3.equals(path)) {
return route3;
} else if (pattern4.equals(path)) {
return route4;
} else if (pattern5.equals(path)) {
return route5;
} else if (pattern6.equals(path)) {
return route6;
} else {
return null;
}
}
}
private static class StaticMapN implements StaticMap {
private final Map<String, StaticRoute> paths = new ConcurrentHashMap<>(10);
public StaticMapN(StaticMap6 staticMap, String path, StaticRoute staticRoute) {
put(staticMap.pattern1, staticMap.route1);
put(staticMap.pattern2, staticMap.route2);
put(staticMap.pattern3, staticMap.route3);
put(staticMap.pattern4, staticMap.route4);
put(staticMap.pattern5, staticMap.route5);
put(staticMap.pattern6, staticMap.route6);
put(path, staticRoute);
staticMap.release();
}
@Override
public StaticRoute get(String path) {
return paths.get(path);
}
@Override
public StaticMap put(String path, StaticRoute staticRoute) {
paths.computeIfAbsent(path, k -> staticRoute);
return this;
}
}
private interface MethodMatcher {
StaticRouterMatch get(String method);
void put(String method, StaticRouterMatch route);
boolean matches(String method);
}
private static class SingleMethodMatcher implements MethodMatcher {
private String method;
private StaticRouterMatch route;
@Override
public void put(String method, StaticRouterMatch route) {
this.method = method;
this.route = route;
}
@Override
public StaticRouterMatch get(String method) {
if (this.method == method) {
return route;
}
return this.method.equals(method) ? route : null;
}
@Override
public boolean matches(String method) {
return this.method.equals(method);
}
public void clear() {
this.method = null;
this.route = null;
}
}
private static class MultipleMethodMatcher implements MethodMatcher {
private final Map<String, StaticRouterMatch> methods = new ConcurrentHashMap<>();
public MultipleMethodMatcher(SingleMethodMatcher matcher) {
methods.put(matcher.method, matcher.route);
matcher.clear();
}
@Override
public StaticRouterMatch get(String method) {
return methods.get(method);
}
@Override
public void put(String method, StaticRouterMatch route) {
methods.put(method, route);
}
@Override
public boolean matches(String method) {
return this.methods.containsKey(method);
}
}
static class StaticRoute {
private MethodMatcher matcher;
public void put(String method, Route route) {
if (matcher == null) {
matcher = new SingleMethodMatcher();
} else if (matcher instanceof SingleMethodMatcher) {
matcher = new MultipleMethodMatcher((SingleMethodMatcher) matcher);
}
matcher.put(method, new StaticRouterMatch(route));
}
}
static class Segment {
byte nodeType;
// String key = "";
String rexPat = EMPTY_STRING;
char tail;
int startIndex;
int endIndex;
public Segment() {}
public Segment(
byte nodeType, /*String key,*/ String regex, char tail, int startIndex, int endIndex) {
this.nodeType = nodeType;
// this.key = key;
this.rexPat = regex;
this.tail = tail;
this.startIndex = startIndex;
this.endIndex = endIndex;
}
}
private static class Node implements Comparable<Node> {
// node type: static, regexp, param, catchAll
byte typ;
// first byte of the prefix
char label;
// first byte of the child prefix
char tail;
// prefix is the common prefix we ignore
String prefix;
// regexp matcher for regexp nodes
Pattern rex;
// HTTP handler endpoints on the leaf node
Map<String, Route> endpoints;
// subroutes on the leaf node
// Routes subroutes;
// child nodes should be stored in-order for iteration,
// in groups of the node type.
Node[][] children = new Node[NODE_SIZE][];
public Node typ(byte typ) {
this.typ = typ;
return this;
}
@Override
public int compareTo(Node o) {
return label - o.label;
}
public Node label(char label) {
this.label = label;
return this;
}
public Node tail(char tail) {
this.tail = tail;
return this;
}
public Node prefix(String prefix) {
this.prefix = prefix;
return this;
}
@Override
public String toString() {
StringBuilder node = new StringBuilder();
if (prefix != null) {
node.append(prefix);
}
node.append("{type: ");
switch (typ) {
case ntStatic:
node.append("static");
break;
case ntParam:
node.append("param");
break;
case ntRegexp:
node.append("regex");
break;
default:
node.append("catch-all");
}
String nodes =
Stream.of(children)
.filter(Objects::nonNull)
.flatMap(Stream::of)
.filter(Objects::nonNull)
.map(Node::toString)
.collect(Collectors.joining(", ", "[", "]"));
node.append(", children: ").append(nodes);
node.append("}");
return node.toString();
}
Node insertRoute(String method, String pattern, Route route) {
Node n = this;
Node parent;
String search = pattern;
while (true) {
// Handle key exhaustion
if (search.isEmpty()) {
// Insert or update the node's leaf handler
n.setEndpoint(method, route);
return n;
}
// We're going to be searching for a wild node next,
// in this case, we need to get the tail
char label = search.charAt(0);
// char segTail;
// int segEndIdx;
// int segTyp;
Segment seg;
if (label == '{' || label == '*') {
// segTyp, _, segRexpat, segTail, _, segEndIdx = patNextSegment(search)
seg = patNextSegment(search);
} else {
seg = new Segment();
}
String prefix;
if (seg.nodeType == ntRegexp) {
prefix = seg.rexPat;
} else {
prefix = EMPTY_STRING;
}
// Look for the edge to attach to
parent = n;
n = n.getEdge(seg.nodeType, label, seg.tail, prefix);
// No edge, create one
if (n == null) {
Node child = new Node().label(label).tail(seg.tail).prefix(search);
Node hn = parent.addChild(child, search);
hn.setEndpoint(method, route);
return hn;
}
// Found an edge to newRuntimeRoute the pattern
if (n.typ > ntStatic) {
// We found a param node, trim the param from the search path and continue.
// This param/wild pattern segment would already be on the tree from a previous
// call to addChild when creating a new node.
search = search.substring(seg.endIndex);
continue;
}
// Static nodes fall below here.
// Determine longest prefix of the search key on newRuntimeRoute.
int commonPrefix = longestPrefix(search, n.prefix);
if (commonPrefix == n.prefix.length()) {
// the common prefix is as long as the current node's prefix we're attempting to insert.
// keep the search going.
search = search.substring(commonPrefix);
continue;
}
// Split the node
Node child = new Node().typ(ntStatic).prefix(search.substring(0, commonPrefix));
parent.replaceChild(search.charAt(0), seg.tail, child);
// Restore the existing node
n.label = n.prefix.charAt(commonPrefix);
n.prefix = n.prefix.substring(commonPrefix);
child.addChild(n, n.prefix);
// If the new key is a subset, set the method/handler on this node and finish.
search = search.substring(commonPrefix);
if (search.isEmpty()) {
child.setEndpoint(method, route);
return child;
}
// Create a new edge for the node
Node subchild = new Node().typ(ntStatic).label(search.charAt(0)).prefix(search);
Node hn = child.addChild(subchild, search);
hn.setEndpoint(method, route);
return hn;
}
}
// addChild appends the new `child` node to the tree using the `pattern` as the trie key.
// For a URL router like chi's, we split the static, param, regexp and wildcard segments
// into different nodes. In addition, addChild will recursively call itself until every
// pattern segment is added to the url pattern tree as individual nodes, depending on type.
Node addChild(Node child, String search) {
Node n = this;
// String search = prefix.toString();
// handler leaf node added to the tree is the child.
// this may be overridden later down the flow
Node hn = child;
// Parse next segment
// segTyp, _, segRexpat, segTail, segStartIdx, segEndIdx := patNextSegment(search)
Segment seg = patNextSegment(search);
byte segTyp = seg.nodeType;
int segStartIdx = seg.startIndex;
int segEndIdx = seg.endIndex;
// Add child depending on next up segment
switch (segTyp) {
case ntStatic:
// Search prefix is all static (that is, has no params in path)
// noop
break;
default:
// Search prefix contains a param, regexp or wildcard
if (segTyp == ntRegexp) {
child.prefix = seg.rexPat;
child.rex = Pattern.compile(seg.rexPat);
}
if (segStartIdx == 0) {
// Route starts with a param
child.typ = segTyp;
if (segTyp == ntCatchAll) {
segStartIdx = -1;
} else {
segStartIdx = segEndIdx;
}
if (segStartIdx < 0) {
segStartIdx = search.length();
}
child.tail = seg.tail; // for params, we set the tail
if (segStartIdx != search.length()) {
// add static edge for the remaining part, split the end.
// its not possible to have adjacent param nodes, so its certainly
// going to be a static node next.
search = search.substring(segStartIdx); // advance search position
Node nn = new Node().typ(ntStatic).label(search.charAt(0)).prefix(search);
hn = child.addChild(nn, search);
}
} else if (segStartIdx > 0) {
// Route has some param
// starts with a static segment
child.typ = ntStatic;
child.prefix = search.substring(0, segStartIdx);
child.rex = null;
// add the param edge node
search = search.substring(segStartIdx);
Node nn = new Node().typ(segTyp).label(search.charAt(0)).tail(seg.tail);
hn = child.addChild(nn, search);
}
}
n.children[child.typ] = append(n.children[child.typ], child);
tailSort(n.children[child.typ]);
return hn;
}
void replaceChild(char label, char tail, Node child) {
Node n = this;
Node[] children = n.children[child.typ];
for (int i = 0; children != null && i < children.length; i++) {
if (children[i].label == label && children[i].tail == tail) {
children[i] = child;
children[i].label = label;
children[i].tail = tail;
return;
}
}
throw new IllegalArgumentException("chi: replacing missing child");
}
Node getEdge(int ntyp, char label, char tail, String prefix) {
Node n = this;
Node[] nds = n.children[ntyp];
for (int i = 0; nds != null && i < nds.length; i++) {
if (nds[i].label == label && nds[i].tail == tail) {
if (ntyp == ntRegexp && !nds[i].prefix.equals(prefix)) {
continue;
}
return nds[i];
}
}
return null;
}
void setEndpoint(String method, Route route) {
Node n = this;
// Set the handler for the method type on the node
if (n.endpoints == null) {
n.endpoints = new ConcurrentHashMap<>();
}
// if ((method & mSTUB) == mSTUB) {
// n.endpoints.put(mSTUB, new Endpoint(handler));
// }
// if ((method & mALL) == mALL) {
// Endpoint h = n.endpoints.get(mALL);
// h.handler = handler;
// h.pattern = pattern;
// h.paramKeys = paramKeys;
// for (Integer m : methodMap.values()) {
// h = n.endpoints.computeIfAbsent(m, k -> new Endpoint(handler));
// h.handler = handler;
// h.pattern = pattern;
// h.paramKeys = paramKeys;
// }
// } else {
n.endpoints.put(method, route);
// Endpoint h = n.endpoints.computeIfAbsent(method, k -> new Endpoint(handler));
// h.handler = handler;
// h.pattern = pattern;
// h.paramKeys = paramKeys;
// }
}
// Recursive edge traversal by checking all nodeTyp groups along the way.
// It's like searching through a multi-dimensional radix trie.
Route findRoute(RouterMatch rctx, String method, Slice path) {
for (int ntyp = 0; ntyp < NODE_SIZE; ntyp++) {
Node[] nds = this.children[ntyp];
if (nds != null) {
Node xn = null;
Slice xsearch = path;
char label = xsearch.isEmpty() ? ZERO_CHAR : xsearch.charAt(0);
switch (ntyp) {
case ntStatic:
xn = findEdge(nds, label);
if (xn == null || !xsearch.startsWith(xn.prefix)) {
continue;
}
xsearch = xsearch.substring(xn.prefix.length());
break;
case ntParam:
case ntRegexp:
// short-circuit and return no matching route for empty param values
if (xsearch.isEmpty()) {
continue;
}
// serially loop through each node grouped by the tail delimiter
for (int idx = 0; idx < nds.length; idx++) {
xn = nds[idx];
// label for param nodes is the delimiter byte
int p = xsearch.indexOf(xn.tail);
if (p < 0) {
if (xn.tail == '/') {
p = xsearch.length();
} else {
continue;
}
}
if (ntyp == ntRegexp && xn.rex != null) {
// 12, ar, page, arx
if (!xn.rex.matcher(xsearch.substring(0, p)).matches()) {
continue;
}
} else if (xsearch.substring(0, p).indexOf('/') > 0) {
// avoid a newRuntimeRoute across path segments
continue;
}
// rctx.routeParams.Values = append(rctx.routeParams.Values, xsearch[:p])
int prevlen = rctx.vars.size();
rctx.value(xsearch.substring(0, p).toString());
xsearch = xsearch.substring(p);
if (xsearch.isEmpty()) {
if (xn.isLeaf()) {
Route h = xn.endpoints.get(method);
if (h != null) {
rctx.key(h.getPathKeys());
return h;
}
rctx.methodNotAllowed(xn.endpoints.keySet());
}
}
// recursively find the next node on this branch
Route fin = xn.findRoute(rctx, method, xsearch);
if (fin != null) {
return fin;
}
// not found on this branch, reset vars
rctx.truncate(prevlen);
xsearch = path;
}
break;
default:
// catch-all nodes
// rctx.routeParams.Values = append(rctx.routeParams.Values, search)