Add MaxMind circuit breaker. Finishes #38
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5
pom.xml
5
pom.xml
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@ -79,6 +79,11 @@
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<artifactId>vertx-redis-client</artifactId>
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<version>3.3.0</version>
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</dependency>
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<dependency>
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<groupId>io.vertx</groupId>
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<artifactId>vertx-circuit-breaker</artifactId>
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<version>3.3.0</version>
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</dependency>
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<!-- Google Libs -->
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<dependency>
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@ -2,6 +2,8 @@ package net.frozenorb.apiv3.util;
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import com.google.common.base.Charsets;
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import com.mongodb.async.SingleResultCallback;
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import io.vertx.circuitbreaker.CircuitBreaker;
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import io.vertx.circuitbreaker.CircuitBreakerOptions;
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import io.vertx.core.http.HttpClient;
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import io.vertx.core.http.HttpClientOptions;
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import io.vertx.core.json.JsonObject;
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@ -17,13 +19,23 @@ public class MaxMindUtils {
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private static final String maxMindUserId = APIv3.getConfig().getProperty("maxMind.userId");
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private static final String maxMindLicenseKey = APIv3.getConfig().getProperty("maxMind.maxMindLicenseKey");
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private static final HttpClient httpsClient = APIv3.getVertxInstance().createHttpClient(new HttpClientOptions().setSsl(true).setTrustAll(true));
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private static final CircuitBreaker breaker;
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public static void getInsights(String ip, SingleResultCallback<MaxMindResult> callback) {
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if (1 == 1) {
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callback.onResult(null, null);
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return;
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// MaxMind likes to randomly not respond, so we take advantage of the circuit breaker pattern to only
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// check MaxMind periodically (while it's in a non-responsive state) to keep our average response times
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// nice and low.
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static {
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breaker = CircuitBreaker.create("maxmind-circuit-breaker", APIv3.getVertxInstance(),
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new CircuitBreakerOptions()
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.setMaxFailures(5)
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.setTimeout(1000) // 1 second
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.setFallbackOnFailure(true)
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.setResetTimeout(120_000) // 2 minutes
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);
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}
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public static void getInsights(String ip, SingleResultCallback<MaxMindResult> callback) {
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breaker.executeWithFallback((future) -> {
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String authHeader = "Basic " + Base64.getEncoder().encodeToString((maxMindUserId + ":" + maxMindLicenseKey).getBytes(Charsets.UTF_8));
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httpsClient.get(443, "geoip.maxmind.com", "/geoip/v2.1/insights/" + ip, (response) -> {
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@ -32,17 +44,23 @@ public class MaxMindUtils {
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try {
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MaxMindResult maxMindResult = new MaxMindResult(bodyJson);
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callback.onResult(maxMindResult, null);
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future.complete(maxMindResult);
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} catch (Exception ignored) {
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callback.onResult(null, null);
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future.complete(null);
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}
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});
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response.exceptionHandler((error) -> callback.onResult(null, error));
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response.exceptionHandler(future::fail);
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})
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.putHeader("Authorization", authHeader)
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.setTimeout(1000)
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.end();
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}, (ignored) -> null).setHandler((result) -> { // The (ignored) -> null section is our fallback, which just returns null (when the breaker is open)
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if (result.failed()) {
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callback.onResult(null, result.cause());
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} else {
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callback.onResult((MaxMindResult) result.result(), null);
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}
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});
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}
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public static String getEnglishName(JsonObject source) {
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