Added command line option --static-nodes-file (#1414) (#1644)

Now able to inject static nodes by explicitly specifying
a static nodes JSON file (.json) on the command line

Co-authored-by: Ratan (Rai) Sur <ratan.r.sur@gmail.com>
Signed-off-by: Terrence Cooke <terrence.s.cooke@gmail.com>

CHANGELOG.md

@@ -6,6 +6,7 @@
 * Implemented [EIP-778](https://eips.ethereum.org/EIPS/eip-778): Ethereum Node Records (ENR) [\#1680](https://github.com/hyperledger/besu/pull/1680)
 * Implemented [EIP-868](https://eips.ethereum.org/EIPS/eip-868): Simple Subroutines for the EVM [\#1721](https://github.com/hyperledger/besu/pull/1721)
 * Added revert reason to eth_estimateGas RPC call. [\#1730](https://github.com/hyperledger/besu/pull/1730)
+* Added command line option --static-nodes-file. [#1644](https://github.com/hyperledger/besu/pull/1644)
 
 ### Bug Fixes
 
@@ -17,6 +18,7 @@
 ### Download link
 TBA
 
+
 ## 20.10.3
 
 ### Additions and Improvements

besu/src/main/java/org/hyperledger/besu/cli/BesuCommand.java

@@ -1055,6 +1055,13 @@ public class BesuCommand implements DefaultCommandValues, Runnable {
       description = "Start Besu in GoQuorum compatibility mode (default: ${DEFAULT-VALUE})")
   private final Boolean isGoQuorumCompatibilityMode = false;
 
+  @CommandLine.Option(
+      names = {"--static-nodes-file"},
+      paramLabel = MANDATORY_FILE_FORMAT_HELP,
+      description =
+          "Specifies the static node file containing the static nodes for this node to connect to")
+  private final Path staticNodesFile = null;
+
   private EthNetworkConfig ethNetworkConfig;
   private JsonRpcConfiguration jsonRpcConfiguration;
   private GraphQLConfiguration graphQLConfiguration;
@@ -2398,9 +2405,18 @@ public class BesuCommand implements DefaultCommandValues, Runnable {
   }
 
   private Set<EnodeURL> loadStaticNodes() throws IOException {
-    final String staticNodesFilename = "static-nodes.json";
-    final Path staticNodesPath = dataDir().resolve(staticNodesFilename);
-
+    final Path staticNodesPath;
+    if (staticNodesFile != null) {
+      staticNodesPath = staticNodesFile.toAbsolutePath();
+      if (!staticNodesPath.toFile().exists()) {
+        throw new ParameterException(
+            commandLine, String.format("Static nodes file %s does not exist", staticNodesPath));
+      }
+    } else {
+      final String staticNodesFilename = "static-nodes.json";
+      staticNodesPath = dataDir().resolve(staticNodesFilename);
+    }
+    logger.info("Static Nodes file = {}", staticNodesPath);
     return StaticNodesParser.fromPath(staticNodesPath, getEnodeDnsConfiguration());
   }
 

besu/src/test/java/org/hyperledger/besu/cli/BesuCommandTest.java

@@ -4074,4 +4074,43 @@ public class BesuCommandTest extends CommandTestAbstract {
         .contains(
             "Port number '8546' has been specified multiple times. Please review the supplied configuration.");
   }
+
+  @Test
+  public void staticNodesFileOptionValueAbsentMessage() {
+    parseCommand("--static-nodes-file");
+    assertThat(commandErrorOutput.toString()).startsWith("Missing required parameter for option");
+  }
+
+  @Test
+  public void staticNodesFilesOptionInvalidJSONFormatError() throws IOException {
+    final Path tempfile =
+        createTempFile(
+            "static-nodes-badformat.json",
+            "\"enode://c0b0e1151971f8a22dc2493c622317c8706c731f6fcf46d93104ef"
+                + "3a08f21f7750b5d5e17f311091f732c9f917b02e1ae6d39f076903779fd1e7"
+                + "e7e6cd2fcef6@192.168.1.25:30303\"\n]");
+    parseCommand("--static-nodes-file", tempfile.toString());
+    assertThat(commandErrorOutput.toString())
+        .startsWith("Failed to decode:Cannot deserialize instance of");
+  }
+
+  @Test
+  public void staticNodesFileOptionFileDoesNotExistMessage() {
+    parseCommand("--static-nodes-file", "this-file-does-not-exist-at-all.json");
+    assertThat(commandErrorOutput.toString()).contains("Static nodes file", "does not exist");
+  }
+
+  @Test
+  public void staticNodesFileOptionValidParamenter() throws IOException {
+    final Path staticNodeTempFile =
+        createTempFile(
+            "static-nodes-goodformat.json",
+            "[\n"
+                + "\"enode://c0b0e1151971f8a22dc2493c622317c8706c731f6fcf46d93104ef"
+                + "3a08f21f7750b5d5e17f311091f732c9f917b02e1ae6d39f076903779fd1e7"
+                + "e7e6cd2fcef6@192.168.1.25:30303\"\n]");
+    parseCommand("--static-nodes-file", staticNodeTempFile.toString());
+    assertThat(commandOutput.toString()).isEmpty();
+    assertThat(commandErrorOutput.toString()).isEmpty();
+  }
 }

besu/src/test/resources/everything_config.toml

@@ -15,6 +15,7 @@ color-enabled=false
 node-private-key-file="./path/to/privateKey"
 pid-path="~/.pid"
 reorg-logging-threshold=0
+static-nodes-file="~/besudata/static-nodes.json"
 
 # Security Module plugin to use
 security-module="localfile"