Implement JSONRPC method generate

Implement the last JSONRPC  method from the `Generating` section of the
docs.

client/src/client_sync/v17/generating.rs

@@ -24,3 +24,15 @@ macro_rules! impl_client_v17__generatetoaddress {
         }
     };
 }
+
+/// Implements bitcoind JSON-RPC API method `generate`
+#[macro_export]
+macro_rules! impl_client_v17__generate {
+    () => {
+        impl Client {
+            pub fn generate(&self, nblocks: usize) -> Result<Generate> {
+                self.call("generate", &[nblocks.into()])
+            }
+        }
+    };
+}

client/src/client_sync/v17/mod.rs

@@ -31,6 +31,7 @@ crate::impl_client_v17__stop!();
 
 // == Generating ==
 crate::impl_client_v17__generatetoaddress!();
+crate::impl_client_v17__generate!();
 
 // == Network ==
 crate::impl_client_v17__getnetworkinfo!();

integration_test/src/v17/generating.rs

@@ -5,15 +5,32 @@
 //! Specifically this is methods found under the `== Generating ==` section of the
 //! API docs of `bitcoind v0.17.1`.
 
-/// Requires `Client` to be in scope and to implement `get_blockchain_info`.
+/// Requires `Client` to be in scope and to implement `generate_to_address`.
 #[macro_export]
 macro_rules! impl_test_v17__generatetoaddress {
     () => {
         #[test]
         fn generate_to_address() {
+            const NBLOCKS: usize = 1;
+
             let bitcoind = $crate::bitcoind_with_default_wallet();
             let address = bitcoind.client.new_address().expect("failed to get new address");
-            let json = bitcoind.client.generate_to_address(1, &address).expect("generatetoaddress");
+            let json = bitcoind.client.generate_to_address(NBLOCKS, &address).expect("generatetoaddress");
+            json.into_model().unwrap();
+        }
+    };
+}
+
+/// Requires `Client` to be in scope and to implement `generate`.
+#[macro_export]
+macro_rules! impl_test_v17__generate {
+    () => {
+        #[test]
+        fn generate() {
+            const NBLOCKS: usize = 100;
+
+            let bitcoind = $crate::bitcoind_with_default_wallet();
+            let json = bitcoind.client.generate(NBLOCKS).expect("generate");
             json.into_model().unwrap();
         }
     };

integration_test/tests/v17_api.rs

@@ -26,6 +26,7 @@ mod generating {
     use super::*;
 
     impl_test_v17__generatetoaddress!();
+    impl_test_v17__generate!();
 }
 
 // == Network ==

json/src/model/generating.rs

@@ -19,3 +19,15 @@ impl GenerateToAddress {
     /// Returns true if 0 blocks were generated.
     pub fn is_empty(&self) -> bool { self.0.is_empty() }
 }
+
+/// Models the result of JSON-RPC method `generate`.
+#[derive(Clone, Debug, PartialEq, Deserialize, Serialize)]
+pub struct Generate(pub Vec<BlockHash>);
+
+impl Generate {
+    /// Returns the number of blocks generated.
+    pub fn len(&self) -> usize { self.0.len() }
+
+    /// Returns true if 0 blocks were generated.
+    pub fn is_empty(&self) -> bool { self.0.is_empty() }
+}

json/src/model/mod.rs

@@ -30,7 +30,7 @@ pub use self::{
         GetBlockVerbosityOne, GetBlockVerbosityZero, GetBlockchainInfo, GetTxOut, Softfork,
         SoftforkType,
     },
-    generating::GenerateToAddress,
+    generating::{Generate, GenerateToAddress},
     network::{GetNetworkInfo, GetNetworkInfoAddress, GetNetworkInfoNetwork},
     raw_transactions::SendRawTransaction,
     wallet::{

json/src/v17/generating.rs

@@ -10,6 +10,7 @@ use serde::{Deserialize, Serialize};
 use crate::model;
 
 /// Result of JSON-RPC method `generatetoaddress`.
+///
 /// > generatetoaddress nblocks "address" ( maxtries )
 /// >
 /// > Mine blocks immediately to a specified address (before the RPC call returns)
@@ -31,3 +32,23 @@ impl GenerateToAddress {
         Ok(model::GenerateToAddress(v))
     }
 }
+
+/// Result of JSON-RPC method `generate`.
+///
+/// > generate nblocks ( maxtries )
+/// >
+/// > Mine up to nblocks blocks immediately (before the RPC call returns) to an address in the wallet.
+/// >
+/// > Arguments:
+/// > 1. nblocks      (numeric, required) How many blocks are generated immediately.
+/// > 2. maxtries     (numeric, optional) How many iterations to try (default = 1000000).
+#[derive(Clone, Debug, PartialEq, Deserialize, Serialize)]
+pub struct Generate(Vec<String>);
+
+impl Generate {
+    /// Converts version specific type to a version in-specific, more strongly typed type.
+    pub fn into_model(self) -> Result<model::Generate, hex::HexToArrayError> {
+        let v = self.0.iter().map(|s| s.parse::<BlockHash>()).collect::<Result<Vec<_>, _>>()?;
+        Ok(model::Generate(v))
+    }
+}

json/src/v17/mod.rs

@@ -41,7 +41,7 @@
 //! - [ ] `uptime`
 //!
 //! **== Generating ==**
-//! - [ ] `generate nblocks ( maxtries )`
+//! - [x] `generate nblocks ( maxtries )`
 //! - [x] `generatetoaddress nblocks address (maxtries)`
 //!
 //! **== Mining ==**
@@ -169,7 +169,7 @@ pub use self::{
         Bip9Softfork, Bip9SoftforkStatus, GetBestBlockHash, GetBlockVerbosityOne,
         GetBlockVerbosityZero, GetBlockchainInfo, GetTxOut, ScriptPubkey, Softfork, SoftforkReject,
     },
-    generating::GenerateToAddress,
+    generating::{Generate, GenerateToAddress},
     network::{GetNetworkInfo, GetNetworkInfoAddress, GetNetworkInfoNetwork},
     raw_transactions::SendRawTransaction,
     wallet::{