solution: rpc for get block hash

splix · Jun 29, 2020 · d710c64 · d710c64
1 parent 1005e67
commit d710c64
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diff --git a/docs/ref-01-api-commands.adoc b/docs/ref-01-api-commands.adoc
@@ -5,6 +5,7 @@
 
 * Chain
 - <<getBlock>>
+- <<chainGetBlockHash>>
 - <<getFinalizedHead>>
 - <<getHead>>
 - <<getRuntimeVersion>>
@@ -35,6 +36,16 @@ Command:: `chain_getBlock`
 Parameters:: hash of the requested block
 Java Object:: `BlockResponseJson`
 
+[#chainGetBlockHash]
+=== Get Block Hash (`chain_getBlockHash`)
+
+Get the block hash for a specific block
+
+Shortcut:: `{shortcut-base}.getBlockHash(at)`
+Command:: `chain_getBlockHash`
+Parameters:: `at` - (optional) block height
+Java Object:: `Hash256`
+
 .BlockResponseJson Properties
 - `BlockJson getBlock()` block details
 - `Object getJustification()`

diff --git a/polkaj-api-base/src/main/java/io/emeraldpay/polkaj/api/StandardCommands.java b/polkaj-api-base/src/main/java/io/emeraldpay/polkaj/api/StandardCommands.java
@@ -27,6 +27,14 @@ public RpcCall<BlockResponseJson> getBlock(Hash256 hash) {
         return RpcCall.create(BlockResponseJson.class, "chain_getBlock", hash);
     }
 
+    public RpcCall<Hash256> getBlockHash() {
+        return RpcCall.create(Hash256.class, "chain_getBlockHash");
+    }
+
+    public RpcCall<Hash256> getBlockHash(long at) {
+        return RpcCall.create(Hash256.class, "chain_getBlockHash", at);
+    }
+
     /**
      * Request for the hash of the current finalized head
      * @return command

diff --git a/polkaj-api-base/src/test/groovy/io/emeraldpay/polkaj/api/StandardCommandsSpec.groovy b/polkaj-api-base/src/test/groovy/io/emeraldpay/polkaj/api/StandardCommandsSpec.groovy
@@ -31,6 +31,22 @@ class StandardCommandsSpec extends Specification {
         act.getResultType(typeFactory).getRawClass() == BlockResponseJson.class
     }
 
+    def "Chain get block hash"() {
+        when:
+        def act = StandardCommands.getInstance().getBlockHash()
+        then:
+        act.method == "chain_getBlockHash"
+        act.params.toList() == []
+        act.getResultType(typeFactory).getRawClass() == Hash256.class
+
+        when:
+        act = StandardCommands.getInstance().getBlockHash(101)
+        then:
+        act.method == "chain_getBlockHash"
+        act.params.toList() == [101]
+        act.getResultType(typeFactory).getRawClass() == Hash256.class
+    }
+
     def "Chain get finalized head"() {
         when:
         def act = StandardCommands.getInstance().getFinalizedHead()