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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.vespa.clustercontroller.utils.staterestapi.server;
import com.yahoo.concurrent.UncheckedTimeoutException;
import com.yahoo.time.TimeBudget;
import com.yahoo.vespa.clustercontroller.utils.communication.http.HttpRequest;
import com.yahoo.vespa.clustercontroller.utils.communication.http.HttpRequestHandler;
import com.yahoo.vespa.clustercontroller.utils.communication.http.HttpResult;
import com.yahoo.vespa.clustercontroller.utils.communication.http.JsonHttpResult;
import com.yahoo.vespa.clustercontroller.utils.staterestapi.StateRestAPI;
import com.yahoo.vespa.clustercontroller.utils.staterestapi.errors.DeadlineExceededException;
import com.yahoo.vespa.clustercontroller.utils.staterestapi.errors.InvalidContentException;
import com.yahoo.vespa.clustercontroller.utils.staterestapi.errors.InvalidOptionValueException;
import com.yahoo.vespa.clustercontroller.utils.staterestapi.errors.OtherMasterException;
import com.yahoo.vespa.clustercontroller.utils.staterestapi.errors.StateRestApiException;
import com.yahoo.vespa.clustercontroller.utils.staterestapi.errors.UnknownMasterException;
import com.yahoo.vespa.clustercontroller.utils.staterestapi.requests.SetUnitStateRequest;
import com.yahoo.vespa.clustercontroller.utils.staterestapi.requests.UnitStateRequest;
import com.yahoo.vespa.clustercontroller.utils.staterestapi.response.SetResponse;
import com.yahoo.vespa.clustercontroller.utils.staterestapi.response.UnitResponse;
import com.yahoo.vespa.clustercontroller.utils.staterestapi.response.UnitState;
import com.yahoo.yolean.Exceptions;
import java.time.Clock;
import java.time.Duration;
import java.time.Instant;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import java.util.Optional;
import java.util.logging.Level;
import java.util.logging.Logger;
public class RestApiHandler implements HttpRequestHandler {
public static final Duration MAX_TIMEOUT = Duration.ofHours(1);
private final static Logger log = Logger.getLogger(RestApiHandler.class.getName());
private final StateRestAPI restApi;
private final JsonWriter jsonWriter;
private final JsonReader jsonReader = new JsonReader();
private final Clock clock;
public RestApiHandler(StateRestAPI restApi) {
this.restApi = restApi;
this.jsonWriter = new JsonWriter();
this.clock = Clock.systemUTC();
}
public RestApiHandler setDefaultPathPrefix(String defaultPathPrefix) {
jsonWriter.setDefaultPathPrefix(defaultPathPrefix);
return this;
}
private static void logRequestException(HttpRequest request, Exception exception, Level level) {
String exceptionString = Exceptions.toMessageString(exception);
log.log(level, "Failed to process request with URI path " + request.getPath() + ": " + exceptionString);
}
@Override
public HttpResult handleRequest(HttpRequest request) {
Instant start = clock.instant();
try{
List<String> unitPath = createUnitPath(request);
if (request.getHttpOperation().equals(HttpRequest.HttpOp.GET)) {
final int recursiveLevel = getRecursiveLevel(request);
UnitResponse data = restApi.getState(new UnitStateRequest() {
@Override
public int getRecursiveLevels() {
return recursiveLevel;
}
@Override
public List<String> getUnitPath() { return unitPath; }
});
return new JsonHttpResult().setJson(jsonWriter.createJson(data));
} else {
final JsonReader.SetRequestData setRequestData = jsonReader.getStateRequestData(request);
final Optional<Duration> timeout = parseTimeout(request.getOption("timeout", null));
SetResponse setResponse = restApi.setUnitState(new SetUnitStateRequest() {
@Override
public Map<String, UnitState> getNewState() {
return setRequestData.stateMap;
}
@Override
public List<String> getUnitPath() {
return unitPath;
}
@Override
public Condition getCondition() { return setRequestData.condition; }
@Override
public ResponseWait getResponseWait() { return setRequestData.responseWait; }
@Override
public TimeBudget timeBudget() { return TimeBudget.from(clock, start, timeout); }
@Override
public boolean isProbe() { return setRequestData.probe; }
});
return new JsonHttpResult().setJson(jsonWriter.createJson(setResponse));
}
} catch (OtherMasterException exception) {
logRequestException(request, exception, Level.FINE);
JsonHttpResult result = new JsonHttpResult();
result.setHttpCode(307, "Temporary Redirect");
result.addHeader("Location", getMasterLocationUrl(request, exception.getHost(), exception.getPort()));
result.setJson(jsonWriter.createErrorJson(exception.getMessage()));
return result;
} catch (UnknownMasterException exception) {
logRequestException(request, exception, Level.WARNING);
JsonHttpResult result = new JsonHttpResult();
result.setHttpCode(503, "Service Unavailable");
result.setJson(jsonWriter.createErrorJson(exception.getMessage()));
return result;
} catch (DeadlineExceededException | UncheckedTimeoutException exception) {
logRequestException(request, exception, Level.WARNING);
JsonHttpResult result = new JsonHttpResult();
result.setHttpCode(504, "Gateway Timeout");
result.setJson(jsonWriter.createErrorJson(exception.getMessage()));
return result;
} catch (StateRestApiException exception) {
logRequestException(request, exception, Level.WARNING);
JsonHttpResult result = new JsonHttpResult();
result.setHttpCode(500, "Failed to process request");
if (exception.getStatus() != null) result.setHttpCode(result.getHttpReturnCode(), exception.getStatus());
if (exception.getCode() != null) result.setHttpCode(exception.getCode(), result.getHttpReturnCodeDescription());
result.setJson(jsonWriter.createErrorJson(exception.getMessage()));
return result;
} catch (Exception exception) {
logRequestException(request, exception, Level.SEVERE);
JsonHttpResult result = new JsonHttpResult();
result.setHttpCode(500, "Failed to process request");
result.setJson(jsonWriter.createErrorJson(exception.getClass().getName() + ": " + exception.getMessage()));
return result;
}
}
private List<String> createUnitPath(HttpRequest request) {
List<String> path = List.of(request.getPath().split("/"));
return path.subList(3, path.size());
}
private int getRecursiveLevel(HttpRequest request) throws StateRestApiException {
String val = request.getOption("recursive", "false");
if (val.equalsIgnoreCase("false")) { return 0; }
if (val.equalsIgnoreCase("true")) { return Integer.MAX_VALUE; }
int level;
try{
level = Integer.parseInt(val);
if (level < 0) throw new NumberFormatException();
} catch (NumberFormatException e) {
throw new InvalidOptionValueException(
"recursive", val, "Recursive option must be true, false, 0 or a positive integer");
}
return level;
}
private String getMasterLocationUrl(HttpRequest request, String host, int port) {
StringBuilder sb = new StringBuilder();
sb.append(request.getScheme()).append("://").append(host).append(':').append(port)
.append(request.getPath());
if (!request.getUrlOptions().isEmpty()) {
boolean first = true;
for (HttpRequest.KeyValuePair kvp : request.getUrlOptions()) {
sb.append(first ? '?' : '&');
first = false;
sb.append(httpEscape(kvp.getKey())).append('=').append(httpEscape(kvp.getValue()));
}
}
return sb.toString();
}
private static class Escape {
public final String pattern;
public final String replaceWith;
public Escape(String pat, String repl) {
this.pattern = pat;
this.replaceWith = repl;
}
}
private static final List<Escape> escapes = new ArrayList<>();
static {
escapes.add(new Escape("%", "%25"));
escapes.add(new Escape(" ", "%20"));
escapes.add(new Escape("\\?", "%3F"));
escapes.add(new Escape("=", "%3D"));
escapes.add(new Escape("\\&", "%26"));
}
private static String httpEscape(String value) {
for(Escape e : escapes) {
value = value.replaceAll(e.pattern, e.replaceWith);
}
return value;
}
static Optional<Duration> parseTimeout(String timeoutOption) throws InvalidContentException {
if (timeoutOption == null) {
return Optional.empty();
}
float timeoutSeconds;
try {
timeoutSeconds = Float.parseFloat(timeoutOption);
} catch (NumberFormatException e) {
throw new InvalidContentException("value of timeout->" + timeoutOption + " is not a float");
}
if (timeoutSeconds <= 0.0) {
return Optional.of(Duration.ZERO);
} else if (timeoutSeconds <= MAX_TIMEOUT.getSeconds()) {
return Optional.of(Duration.ofMillis(Math.round(timeoutSeconds * 1000)));
} else {
throw new InvalidContentException("value of timeout->" + timeoutOption + " exceeds max timeout " + MAX_TIMEOUT);
}
}
}
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