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// Copyright Vespa.ai. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.config.subscription;
import com.yahoo.collections.Pair;
import com.yahoo.config.ConfigurationRuntimeException;
import com.yahoo.config.StringNode;
import com.yahoo.vespa.config.ConfigPayload;
import com.yahoo.vespa.config.ConfigPayloadBuilder;
import java.util.ArrayList;
import java.util.List;
import static java.util.logging.Level.FINE;
import static java.util.logging.Level.FINEST;
/**
* Deserializes config payload (cfg format) to a ConfigPayload.
*
* @author hmusum
*/
public class CfgConfigPayloadBuilder {
private static final java.util.logging.Logger log = java.util.logging.Logger.getLogger(CfgConfigPayloadBuilder.class.getName());
/**
* Deserializes a config payload to slime
*
* @param lines a list with config payload strings
* @return an instance of the config class
*/
public ConfigPayload deserialize(List<String> lines) {
return ConfigPayload.fromBuilder(deserializeToBuilder(lines));
}
@SuppressWarnings("WeakerAccess")
public ConfigPayloadBuilder deserializeToBuilder(List<String> lines) {
int lineNum = 1;
ConfigPayloadBuilder payloadBuilder = new ConfigPayloadBuilder();
for (String line : lines) {
parseLine(line, lineNum, payloadBuilder);
lineNum++;
}
log.log(FINEST, () -> "payload=" + payloadBuilder);
return payloadBuilder;
}
private void parseLine(final String line, int lineNum, ConfigPayloadBuilder payloadBuilder) {
String trimmedLine = line.trim();
if (trimmedLine.startsWith("#")) return;
Pair<String, String> fieldAndValue = parseFieldAndValue(trimmedLine);
String field = fieldAndValue.getFirst();
String value = fieldAndValue.getSecond();
if (field==null || value==null) {
log.log(FINE, () -> "Got field without value in line " + lineNum + ": " + line + ", skipping");
return;
}
field = field.trim();
value = value.trim();
validateField(field, trimmedLine, lineNum);
validateValue(value, trimmedLine, lineNum);
List<String> fields = parseFieldList(field);
ConfigPayloadBuilder currentBuilder = payloadBuilder;
for (int fieldNum = 0; fieldNum < fields.size(); fieldNum++) {
String fieldName = fields.get(fieldNum);
boolean isLeaf = (fieldNum == fields.size() - 1);
if (isLeaf) {
if (isArray(fieldName)) {
// array leaf
ConfigPayloadBuilder.Array array = currentBuilder.getArray(getArrayName(fieldName));
array.set(getArrayIndex(fieldName), removeQuotes(value));
} else if (isMap(fieldName)) {
// map leaf
ConfigPayloadBuilder.MapBuilder map = currentBuilder.getMap(getMapName(fieldName));
map.put(getMapKey(fieldName), removeQuotes(value));
} else {
// scalar leaf value
currentBuilder.setField(fieldName, removeQuotes(value));
}
} else {
if (isArray(fieldName)) {
// array of structs
ConfigPayloadBuilder.Array array = currentBuilder.getArray(getArrayName(fieldName));
currentBuilder = array.get(getArrayIndex(fieldName));
} else if (isMap(fieldName)) {
// map of structs
ConfigPayloadBuilder.MapBuilder map = currentBuilder.getMap(getMapName(fieldName));
currentBuilder = map.get(getMapKey(fieldName));
} else {
// struct
currentBuilder = currentBuilder.getObject(fieldName);
}
}
}
}
// split on space, but not if inside { } (map key)
Pair<String, String> parseFieldAndValue(String line) {
String field=null;
String value;
StringBuilder sb = new StringBuilder();
boolean inMapKey = false;
for (char c : line.toCharArray()) {
if (c=='{') inMapKey=true;
if (c=='}') inMapKey=false;
if (c==' ' && !inMapKey) {
if (field==null) {
field = sb.toString();
sb = new StringBuilder();
continue;
}
}
sb.append(c);
}
value = sb.toString();
return new Pair<>(field, value);
}
// split on dot, but not if inside { } (map key)
List<String> parseFieldList(String field) {
List<String> ret = new ArrayList<>();
StringBuilder sb = new StringBuilder();
boolean inMapKey = false;
for (char c : field.toCharArray()) {
if (c=='{') inMapKey=true;
if (c=='}') inMapKey=false;
if (c=='.' && !inMapKey) {
ret.add(sb.toString());
sb = new StringBuilder();
continue;
}
sb.append(c);
}
ret.add(sb.toString());
return ret;
}
// TODO Need more validation
private void validateField(String field, String line, int lineNum) {
if (field.length() == 0) {
throw new ConfigurationRuntimeException("Error on line " + lineNum + ": " + line + "\n" +
"'" + field + "' is not a valid field name");
}
}
// TODO Need more validation
private void validateValue(String value, String line, int lineNum) {
if (value.length() == 0) {
throw new ConfigurationRuntimeException("Error on line " + lineNum + ": " + line + "\n" +
"'" + value + "' is not a valid value");
}
}
private boolean isArray(String name) {
return name.endsWith("]") && !name.startsWith("[");
}
private boolean isMap(String name) {
return name.contains("{");
}
private String removeQuotes(String s) {
return StringNode.unescapeQuotedString(s);
}
private String getMapName(String name) {
if (name.contains("{")) {
return name.substring(0, name.indexOf("{"));
} else {
return name;
}
}
private String getMapKey(String name) {
if (name.contains("{")) {
return removeQuotes(name.substring(name.indexOf("{") + 1, name.indexOf("}")));
} else {
return "";
}
}
private String getArrayName(String name) {
if (name.contains("[")) {
return name.substring(0, name.indexOf("["));
} else {
return name;
}
}
private int getArrayIndex(String name) {
if (name.contains("[")) {
return Integer.parseInt(name.substring(name.indexOf("[") + 1, name.indexOf("]")));
} else {
return 0;
}
}
}
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