Support load configuration from tikv.properties on classpath (#297)

Signed-off-by: marsishandsome <marsishandsome@gmail.com>

README.md

@@ -82,21 +82,6 @@ public class Main {
 
 The following includes JVM related parameters.
 
-#### tikv.configuration_file
-- tikv java client configuration file
-- default: null
-
-This parameter can be passed by `-Dtikv.configuration_file=/path/to/tikv_client_config.properties`.
-
-Here is an example of `tikv_client_config.properties`.
-
-```
-tikv.grpc.timeout_in_ms=150ms 
-tikv.grpc.forward_timeout_in_ms=200ms
-tikv.metrics.enable=true
-tikv.metrics.port=3140
-```
-
 #### tikv.pd.addresses
 - pd addresses, separated by comma
 - default: 127.0.0.1:2379

src/main/java/org/tikv/common/ConfigUtils.java

@@ -19,7 +19,7 @@ import org.tikv.common.util.BackOffer;
 import org.tikv.kvproto.Kvrpcpb;
 
 public class ConfigUtils {
-  public static final String TIKV_CONFIGURATION_FILE = "tikv.configuration_file";
+  public static final String TIKV_CONFIGURATION_FILENAME = "tikv.properties";
 
   public static final String TIKV_PD_ADDRESSES = "tikv.pd.addresses";
   public static final String TIKV_GRPC_TIMEOUT = "tikv.grpc.timeout_in_ms";

src/main/java/org/tikv/common/TiConfiguration.java

@@ -18,8 +18,8 @@ package org.tikv.common;
 import static org.tikv.common.ConfigUtils.*;
 
 import io.grpc.Metadata;
-import java.io.FileInputStream;
 import java.io.IOException;
+import java.io.InputStream;
 import java.io.Serializable;
 import java.net.URI;
 import java.util.*;
@@ -57,20 +57,27 @@ public class TiConfiguration implements Serializable {
   }
 
   private static void loadFromConfigurationFile() {
-    Optional<String> file = getOption(TIKV_CONFIGURATION_FILE);
-    if (file.isPresent()) {
+    try (InputStream input =
+        TiConfiguration.class
+            .getClassLoader()
+            .getResourceAsStream(ConfigUtils.TIKV_CONFIGURATION_FILENAME)) {
       Properties properties = new Properties();
-      try {
-        properties.load(new FileInputStream(file.get()));
-      } catch (IOException e) {
-        logger.error("load config file error, path = " + file.get(), e);
+
+      if (input == null) {
+        logger.warn("Unable to find " + ConfigUtils.TIKV_CONFIGURATION_FILENAME);
+        return;
       }
+
+      logger.info("loading " + ConfigUtils.TIKV_CONFIGURATION_FILENAME);
+      properties.load(input);
       for (String key : properties.stringPropertyNames()) {
         if (key.startsWith("tikv.")) {
           String value = properties.getProperty(key);
           setIfMissing(key, value);
         }
       }
+    } catch (IOException e) {
+      logger.error("load config file error", e);
     }
   }
 
@@ -117,7 +124,7 @@ public class TiConfiguration implements Serializable {
   }
 
   public static void listAll() {
-    logger.warn("static configurations are:" + new ArrayList<>(settings.entrySet()).toString());
+    logger.info("static configurations are:" + new ArrayList<>(settings.entrySet()).toString());
   }
 
   private static void set(String key, String value) {

src/test/java/org/tikv/common/TiConfigurationTest.java

@@ -17,12 +17,11 @@ package org.tikv.common;
 
 import static org.junit.Assert.assertEquals;
 
-import org.junit.Ignore;
+import org.junit.Test;
 
 public class TiConfigurationTest {
 
-  // Set `-Dtikv.configuration_file=src/test/resources/tikv_client_config.properties` to test
-  @Ignore
+  @Test
   public void configFileTest() {
     TiConfiguration conf = TiConfiguration.createRawDefault();
     assertEquals("configFileTest", conf.getDBPrefix());