      1
      2
      3
      4
      5
      6
      7
      8
      9
     10
     11
     12
     13
     14
     15
     16
     17
     18
     19
     20
     21
     22
     23
     24
     25
     26
     27
     28
     29
     30
     31
     32
     33
     34
     35
     36
     37
     38
     39
     40
     41
     42
     43
     44
     45
     46
     47
     48
     49
     50
     51
     52
     53
     54
     55
     56
     57
     58
     59
     60
     61
     62
     63
     64
     65
     66
     67
     68
     69
     70
     71
     72
     73
     74
     75
     76
     77
     78
     79
     80
     81
     82
     83
     84
     85
     86
     87
     88
     89
     90
     91
     92
     93
     94
     95
     96
     97
     98
     99
    100
    101
    102
    103
    104
    105
    106
    107
    108
    109
    110
    111
    112
    113
    114
    115
    116
    117
    118
    119
    120
    121
    122
    123
    124
    125
    126
    127
    128
    129
    130
    131
    132
    133
    134
    135
    136
    137
    138
    139
    140
    141
    142
    143
    144
    145
    146

    use std::collections::HashMap;
    use std::sync::Arc;
    use std::mem::replace;
    use parking_lot::RwLock;
    use hash::H256;
    use bytes::Bytes;
    use ser::List;
    use chain::{Transaction as ChainTransaction, BlockHeader};
    use kv::{Transaction, Key, KeyState, Operation, Value, KeyValueDatabase, KeyValue};
    use storage::{TransactionMeta};

    #[derive(Default, Debug)]
    struct InnerDatabase {
    	meta: HashMap<&'static str, KeyState<Bytes>>,
    	block_hash: HashMap<u32, KeyState<H256>>,
    	block_header: HashMap<H256, KeyState<BlockHeader>>,
    	block_transactions: HashMap<H256, KeyState<List<H256>>>,
    	transaction: HashMap<H256, KeyState<ChainTransaction>>,
    	transaction_meta: HashMap<H256, KeyState<TransactionMeta>>,
    	block_number: HashMap<H256, KeyState<u32>>,
    	configuration: HashMap<&'static str, KeyState<Bytes>>,
    }

    #[derive(Default, Debug)]
    pub struct MemoryDatabase {
    	db: RwLock<InnerDatabase>,
    }

    impl MemoryDatabase {
    	pub fn drain_transaction(&self) -> Transaction {
    		let mut db = self.db.write();
    		let meta = replace(&mut db.meta, HashMap::default()).into_iter()
    			.flat_map(|(key, state)| state.into_operation(key, KeyValue::Meta, Key::Meta));

    		let block_hash = replace(&mut db.block_hash, HashMap::default()).into_iter()
    			.flat_map(|(key, state)| state.into_operation(key, KeyValue::BlockHash, Key::BlockHash));

    		let block_header = replace(&mut db.block_header, HashMap::default()).into_iter()
    			.flat_map(|(key, state)| state.into_operation(key, KeyValue::BlockHeader, Key::BlockHeader));

    		let block_transactions = replace(&mut db.block_transactions, HashMap::default()).into_iter()
    			.flat_map(|(key, state)| state.into_operation(key, KeyValue::BlockTransactions, Key::BlockTransactions));

    		let transaction = replace(&mut db.transaction, HashMap::default()).into_iter()
    			.flat_map(|(key, state)| state.into_operation(key, KeyValue::Transaction, Key::Transaction));

    		let transaction_meta = replace(&mut db.transaction_meta, HashMap::default()).into_iter()
    			.flat_map(|(key, state)| state.into_operation(key, KeyValue::TransactionMeta, Key::TransactionMeta));

    		let block_number = replace(&mut db.block_number, HashMap::default()).into_iter()
    			.flat_map(|(key, state)| state.into_operation(key, KeyValue::BlockNumber, Key::BlockNumber));

    		let configuration = replace(&mut db.configuration, HashMap::default()).into_iter()
    			.flat_map(|(key, state)| state.into_operation(key, KeyValue::Configuration, Key::Configuration));

    		Transaction {
    			operations: meta
    				.chain(block_hash)
    				.chain(block_header)
    				.chain(block_transactions)
    				.chain(transaction)
    				.chain(transaction_meta)
    				.chain(block_number)
    				.chain(configuration)
    				.collect()
    		}
    	}
    }

    impl KeyValueDatabase for MemoryDatabase {
    	fn write(&self, tx: Transaction) -> Result<(), String> {
    		let mut db = self.db.write();
    		for op in tx.operations.into_iter() {
    			match op {
    				Operation::Insert(insert) => match insert {
    					KeyValue::Meta(key, value) => { db.meta.insert(key, KeyState::Insert(value)); },
    					KeyValue::BlockHash(key, value) => { db.block_hash.insert(key, KeyState::Insert(value)); },
    					KeyValue::BlockHeader(key, value) => { db.block_header.insert(key, KeyState::Insert(value)); },
    					KeyValue::BlockTransactions(key, value) => { db.block_transactions.insert(key, KeyState::Insert(value)); },
    					KeyValue::Transaction(key, value) => { db.transaction.insert(key, KeyState::Insert(value)); },
    					KeyValue::TransactionMeta(key, value) => { db.transaction_meta.insert(key, KeyState::Insert(value)); },
    					KeyValue::BlockNumber(key, value) => { db.block_number.insert(key, KeyState::Insert(value)); },
    					KeyValue::Configuration(key, value) => { db.configuration.insert(key, KeyState::Insert(value)); },
    				},
    				Operation::Delete(delete) => match delete {
    					Key::Meta(key) => { db.meta.insert(key, KeyState::Delete); }
    					Key::BlockHash(key) => { db.block_hash.insert(key, KeyState::Delete); }
    					Key::BlockHeader(key) => { db.block_header.insert(key, KeyState::Delete); }
    					Key::BlockTransactions(key) => { db.block_transactions.insert(key, KeyState::Delete); }
    					Key::Transaction(key) => { db.transaction.insert(key, KeyState::Delete); }
    					Key::TransactionMeta(key) => { db.transaction_meta.insert(key, KeyState::Delete); }
    					Key::BlockNumber(key) => { db.block_number.insert(key, KeyState::Delete); }
    					Key::Configuration(key) => { db.configuration.insert(key, KeyState::Delete); }
    				}
    			}
    		}
    		Ok(())
    	}

    	fn get(&self, key: &Key) -> Result<KeyState<Value>, String> {
    		let db = self.db.read();
    		let result = match *key {
    			Key::Meta(ref key) => db.meta.get(key).cloned().unwrap_or_default().map(Value::Meta),
    			Key::BlockHash(ref key) => db.block_hash.get(key).cloned().unwrap_or_default().map(Value::BlockHash),
    			Key::BlockHeader(ref key) => db.block_header.get(key).cloned().unwrap_or_default().map(Value::BlockHeader),
    			Key::BlockTransactions(ref key) => db.block_transactions.get(key).cloned().unwrap_or_default().map(Value::BlockTransactions),
    			Key::Transaction(ref key) => db.transaction.get(key).cloned().unwrap_or_default().map(Value::Transaction),
    			Key::TransactionMeta(ref key) => db.transaction_meta.get(key).cloned().unwrap_or_default().map(Value::TransactionMeta),
    			Key::BlockNumber(ref key) => db.block_number.get(key).cloned().unwrap_or_default().map(Value::BlockNumber),
    			Key::Configuration(ref key) => db.configuration.get(key).cloned().unwrap_or_default().map(Value::Configuration),
    		};

    		Ok(result)
    	}
    }

    #[derive(Debug)]
    pub struct SharedMemoryDatabase {
    	db: Arc<MemoryDatabase>,
    }

    impl Default for SharedMemoryDatabase {
    	fn default() -> Self {
    		SharedMemoryDatabase {
    			db: Arc::default(),
    		}
    	}
    }

    impl Clone for SharedMemoryDatabase {
    	fn clone(&self) -> Self {
    		SharedMemoryDatabase {
    			db: self.db.clone(),
    		}
    	}
    }

    impl KeyValueDatabase for SharedMemoryDatabase {
    	fn write(&self, tx: Transaction) -> Result<(), String> {
    		self.db.write(tx)
    	}

    	fn get(&self, key: &Key) -> Result<KeyState<Value>, String> {
    		self.db.get(key)
    	}
    }

# Help

## Keyboard Shortcuts

`?`
  Show this help dialog
`S`
  Focus the search field
`↑`
  Move up in search results
`↓`
  Move down in search results
`↹`
  Switch tab
`⏎`
  Go to active search result
`+`
  Expand all sections
`-`
  Collapse all sections

## Search Tricks

Prefix searches with a type followed by a colon (e.g. `fn:`) to restrict the search to a given type.

Accepted types are: `fn`, `mod`, `struct`, `enum`, `trait`, `type`, `macro`, and `const`.

Search functions by type signature (e.g. `vec -> usize` or `* -> vec`)

Search multiple things at once by splitting your query with comma (e.g. `str,u8` or `String,struct:Vec,test`)