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Handler.java
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Handler.java
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package example;
import com.amazonaws.services.lambda.runtime.Context;
import com.amazonaws.services.lambda.runtime.LambdaLogger;
import com.amazonaws.services.lambda.runtime.RequestStreamHandler;
import com.google.gson.Gson;
import com.google.gson.GsonBuilder;
import com.google.gson.JsonSyntaxException;
import org.json.JSONObject;
import org.json.JSONTokener;
import java.util.HashMap;
import java.io.InputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.io.InputStreamReader;
import java.io.BufferedReader;
import java.io.OutputStreamWriter;
import java.io.PrintWriter;
import java.io.BufferedWriter;
import java.nio.charset.Charset;
import java.lang.IllegalStateException;
// Specific to invokeTrieAlgorithm()
import web.utils.Serializer;
import web.wordle_solver.SingletonSteward;
import java.util.HashSet;
import java.util.StringTokenizer;
import trie.PotentialWordsWrapper;
import java.util.stream.Stream;
import java.util.Set;
import java.util.Map;
import java.util.stream.Collectors;
// Handler value: example.HandlerStream
public class Handler implements RequestStreamHandler {
Gson gson = new GsonBuilder().setPrettyPrinting().create();
@Override
public void handleRequest(InputStream inputStream, OutputStream outputStream, Context context) throws IOException
{
// JSONParser parser = new JSONParser();
JSONObject headerJson = new JSONObject();
JSONObject responseBody = new JSONObject();
JSONObject responseJson = new JSONObject();
LambdaLogger logger = context.getLogger();
PrintWriter writer = new PrintWriter(new BufferedWriter(new OutputStreamWriter(outputStream, Charset.forName("US-ASCII"))));
try
{
JSONTokener tokener = new JSONTokener(inputStream);
JSONObject event = new JSONObject(tokener);
logger.log("STREAM TYPE: " + inputStream.getClass().toString());
logger.log("EVENT TYPE: " + event.toString());
String missingCharsCSV = null;
if (event.get("queryStringParameters") != null) {
JSONObject qps = (JSONObject) event.get("queryStringParameters");
if (qps.get("missingCharsCSV") != null) {
missingCharsCSV = (String) qps.get("missingCharsCSV");
}
}
String charGuessesMapCSV = null;
if (event.get("queryStringParameters") != null) {
JSONObject qps = (JSONObject) event.get("queryStringParameters");
if (qps.get("charGuessesMapCSV") != null) {
charGuessesMapCSV = (String) qps.get("charGuessesMapCSV");
}
}
String currentGuess = null;
if (event.get("queryStringParameters") != null) {
JSONObject qps = (JSONObject) event.get("queryStringParameters");
if (qps.get("currentGuess") != null) {
currentGuess = (String) qps.get("currentGuess");
}
}
headerJson.put("Access-Control-Allow-Origin","http://solvewordle.net");
responseBody.put("missingCharsCSV", missingCharsCSV);
responseBody.put("charGuessesMapCSV", charGuessesMapCSV);
responseBody.put("currentGuess", currentGuess);
String trieAlgorightmResult = invokeTrieAlgorithm(missingCharsCSV, charGuessesMapCSV, currentGuess);
if (trieAlgorightmResult.startsWith("400:")) {
responseJson.put("statusCode", 400);
} else {
responseJson.put("statusCode", 200);
}
responseBody.put("potentialWords", trieAlgorightmResult); // will contain the result set, or error message
responseJson.put("headers", headerJson);
responseJson.put("body", responseBody.toString());
if (writer.checkError())
{
logger.log("WARNING: Writer encountered an error.");
}
}
catch (IllegalStateException | JsonSyntaxException exception)
{
logger.log(exception.toString());
}
finally
{
// reader.close();
writer.write(responseJson.toString());
writer.close();
}
}
private String invokeTrieAlgorithm(String missingCharsCSV, String charGuessesMapCSV, String currentGuess) {
// missingChars
HashSet<Character> missingChars = new HashSet(26);
StringTokenizer st = new StringTokenizer(missingCharsCSV, ",");
while (st.hasMoreTokens()) {
String nextToken = st.nextToken();
// Needs to be a single character
if (nextToken.length()>1) {
return "400: missingCharsCSV contains non-char: " + nextToken;
}
missingChars.add(nextToken.charAt(0));
}
// charGuessesMap, parsed of the form "charGuessesMapCSV=0n,2c"
Map<Character, Set<Integer>> charGuessesMap = new HashMap<>();
st = new StringTokenizer(charGuessesMapCSV, ",");
while (st.hasMoreTokens()) {
String nextToken = st.nextToken();
if (nextToken.length()>2) {
return "400: charGuessesMapCSV contains bad map pair: " + nextToken;
}
int mapIndex = Character.getNumericValue( nextToken.charAt(0) );
char guessedChar = nextToken.charAt(1);
charGuessesMap.put(guessedChar, Stream.of(mapIndex).collect(Collectors.toCollection(HashSet::new)));
}
// currentGuess
if (currentGuess.length()!=5) {
return "400: currentGuess is invalid: " + currentGuess;
}
SingletonSteward singletonSteward = SingletonSteward.getInstance();
final PotentialWordsWrapper potentialWordsWrapper = singletonSteward.trie.generatePotentialWords(currentGuess, charGuessesMap, missingChars);
String potentialWordsJSON = Serializer.createJSONString(potentialWordsWrapper);
return potentialWordsJSON;
}
}