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Merge pull request #25 from launchdarkly/jko/indirect-stream
Support for indirect stream events
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158 changes: 158 additions & 0 deletions
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src/main/java/com/launchdarkly/client/FeatureRequestor.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,158 @@ | ||
| package com.launchdarkly.client; | ||
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| import com.google.gson.Gson; | ||
| import com.google.gson.reflect.TypeToken; | ||
| import org.apache.http.HttpStatus; | ||
| import org.apache.http.client.cache.CacheResponseStatus; | ||
| import org.apache.http.client.cache.HttpCacheContext; | ||
| import org.apache.http.client.config.RequestConfig; | ||
| import org.apache.http.client.methods.CloseableHttpResponse; | ||
| import org.apache.http.client.methods.HttpGet; | ||
| import org.apache.http.impl.client.CloseableHttpClient; | ||
| import org.apache.http.impl.client.cache.CacheConfig; | ||
| import org.apache.http.impl.client.cache.CachingHttpClients; | ||
| import org.apache.http.impl.conn.PoolingHttpClientConnectionManager; | ||
| import org.apache.http.util.EntityUtils; | ||
| import org.slf4j.Logger; | ||
| import org.slf4j.LoggerFactory; | ||
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| import java.io.IOException; | ||
| import java.lang.reflect.Type; | ||
| import java.util.Map; | ||
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| class FeatureRequestor { | ||
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| private final String apiKey; | ||
| private final LDConfig config; | ||
| private final CloseableHttpClient client; | ||
| private static final Logger logger = LoggerFactory.getLogger(FeatureRequestor.class); | ||
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| FeatureRequestor(String apiKey, LDConfig config) { | ||
| this.apiKey = apiKey; | ||
| this.config = config; | ||
| this.client = createClient(); | ||
| } | ||
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| protected CloseableHttpClient createClient() { | ||
| CloseableHttpClient client; | ||
| PoolingHttpClientConnectionManager manager = new PoolingHttpClientConnectionManager(); | ||
| manager.setMaxTotal(100); | ||
| manager.setDefaultMaxPerRoute(20); | ||
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| CacheConfig cacheConfig = CacheConfig.custom() | ||
| .setMaxCacheEntries(1000) | ||
| .setMaxObjectSize(131072) | ||
| .setSharedCache(false) | ||
| .build(); | ||
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| RequestConfig requestConfig = RequestConfig.custom() | ||
| .setConnectTimeout(config.connectTimeout) | ||
| .setSocketTimeout(config.socketTimeout) | ||
| .setProxy(config.proxyHost) | ||
| .build(); | ||
| client = CachingHttpClients.custom() | ||
| .setCacheConfig(cacheConfig) | ||
| .setConnectionManager(manager) | ||
| .setDefaultRequestConfig(requestConfig) | ||
| .build(); | ||
| return client; | ||
| } | ||
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| Map<String, FeatureRep<?>> makeAllRequest(boolean latest) throws IOException { | ||
| Gson gson = new Gson(); | ||
| HttpCacheContext context = HttpCacheContext.create(); | ||
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| String resource = latest ? "/api/eval/latest-features" : "/api/eval/features"; | ||
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| HttpGet request = config.getRequest(apiKey, resource); | ||
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| CloseableHttpResponse response = null; | ||
| try { | ||
| response = client.execute(request, context); | ||
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| logCacheResponse(context.getCacheResponseStatus()); | ||
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| handleResponseStatus(response.getStatusLine().getStatusCode(), null); | ||
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| Type type = new TypeToken<Map<String, FeatureRep<?>>>() {}.getType(); | ||
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| Map<String, FeatureRep<?>> result = gson.fromJson(EntityUtils.toString(response.getEntity()), type); | ||
| return result; | ||
| } | ||
| finally { | ||
| try { | ||
| if (response != null) response.close(); | ||
| } catch (IOException e) { | ||
| } | ||
| } | ||
| } | ||
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| void logCacheResponse(CacheResponseStatus status) { | ||
| switch (status) { | ||
| case CACHE_HIT: | ||
| logger.debug("A response was generated from the cache with " + | ||
| "no requests sent upstream"); | ||
| break; | ||
| case CACHE_MODULE_RESPONSE: | ||
| logger.debug("The response was generated directly by the " + | ||
| "caching module"); | ||
| break; | ||
| case CACHE_MISS: | ||
| logger.debug("The response came from an upstream server"); | ||
| break; | ||
| case VALIDATED: | ||
| logger.debug("The response was generated from the cache " + | ||
| "after validating the entry with the origin server"); | ||
| break; | ||
| } | ||
| } | ||
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| void handleResponseStatus(int status, String featureKey) throws IOException { | ||
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| if (status != HttpStatus.SC_OK) { | ||
| if (status == HttpStatus.SC_UNAUTHORIZED) { | ||
| logger.error("Invalid API key"); | ||
| } else if (status == HttpStatus.SC_NOT_FOUND) { | ||
| if (featureKey != null) { | ||
| logger.error("Unknown feature key: " + featureKey); | ||
| } | ||
| else { | ||
| logger.error("Resource not found"); | ||
| } | ||
| } else { | ||
| logger.error("Unexpected status code: " + status); | ||
| } | ||
| throw new IOException("Failed to fetch flag"); | ||
| } | ||
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| } | ||
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| <T> FeatureRep<T> makeRequest(String featureKey, boolean latest) throws IOException { | ||
| Gson gson = new Gson(); | ||
| HttpCacheContext context = HttpCacheContext.create(); | ||
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| String resource = latest ? "/api/eval/latest-features/" : "/api/eval/features/"; | ||
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| HttpGet request = config.getRequest(apiKey,resource + featureKey); | ||
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| CloseableHttpResponse response = null; | ||
| try { | ||
| response = client.execute(request, context); | ||
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| logCacheResponse(context.getCacheResponseStatus()); | ||
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| handleResponseStatus(response.getStatusLine().getStatusCode(), featureKey); | ||
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| Type type = new TypeToken<FeatureRep<T>>() {}.getType(); | ||
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| FeatureRep<T> result = gson.fromJson(EntityUtils.toString(response.getEntity()), type); | ||
| return result; | ||
| } | ||
| finally { | ||
| try { | ||
| if (response != null) response.close(); | ||
| } catch (IOException e) { | ||
| } | ||
| } | ||
| } | ||
| } |
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