feat: add info command (stipsan#909)

compat.md

@@ -65,7 +65,7 @@
 | [incr](http://redis.io/commands/INCR)                                 | :white_check_mark: | :white_check_mark: |
 | [incrby](http://redis.io/commands/INCRBY)                             | :white_check_mark: | :white_check_mark: |
 | [incrbyfloat](http://redis.io/commands/INCRBYFLOAT)                   | :white_check_mark: | :white_check_mark: |
-| [info](http://redis.io/commands/INFO)                                 | :white_check_mark: |        :x:         |
+| [info](http://redis.io/commands/INFO)                                 | :white_check_mark: | :white_check_mark: |
 | [keys](http://redis.io/commands/KEYS)                                 | :white_check_mark: | :white_check_mark: |
 | [lastsave](http://redis.io/commands/LASTSAVE)                         | :white_check_mark: | :white_check_mark: |
 | [lindex](http://redis.io/commands/LINDEX)                             | :white_check_mark: | :white_check_mark: |

src/commands/index.js

@@ -44,6 +44,7 @@ export * from './hvals';
 export * from './incr';
 export * from './incrby';
 export * from './incrbyfloat';
+export * from './info';
 export * from './keys';
 export * from './lastsave';
 export * from './lindex';

src/commands/info.js

@@ -0,0 +1,147 @@
+export function info() {
+  if (this.data.has('info')) {
+    return this.data.get('info');
+  }
+
+  const defaultInfo = `# Server
+redis_version:5.0.7
+redis_git_sha1:00000000
+redis_git_dirty:0
+redis_build_id:6eea854fbb5ddd69
+redis_mode:standalone
+os:Linux 4.19.76-linuxkit x86_64
+arch_bits:64
+multiplexing_api:epoll
+atomicvar_api:atomic-builtin
+gcc_version:9.2.0
+process_id:1
+run_id:4787d20e758149c8d52455abc39cf8cf277a334c
+tcp_port:6379
+uptime_in_seconds:968
+uptime_in_days:0
+hz:10
+configured_hz:10
+lru_clock:642868
+executable:/data/redis-server
+config_file:
+
+# Clients
+connected_clients:1
+client_recent_max_input_buffer:2
+client_recent_max_output_buffer:0
+blocked_clients:0
+
+# Memory
+used_memory:898376
+used_memory_human:877.32K
+used_memory_rss:4046848
+used_memory_rss_human:3.86M
+used_memory_peak:1022480
+used_memory_peak_human:998.52K
+used_memory_peak_perc:87.86%
+used_memory_overhead:847550
+used_memory_startup:791264
+used_memory_dataset:50826
+used_memory_dataset_perc:47.45%
+allocator_allocated:1626408
+allocator_active:1945600
+allocator_resident:8847360
+total_system_memory:2086522880
+total_system_memory_human:1.94G
+used_memory_lua:51200
+used_memory_lua_human:50.00K
+used_memory_scripts:4528
+used_memory_scripts_human:4.42K
+number_of_cached_scripts:2
+maxmemory:0
+maxmemory_human:0B
+maxmemory_policy:noeviction
+allocator_frag_ratio:1.20
+allocator_frag_bytes:319192
+allocator_rss_ratio:4.55
+allocator_rss_bytes:6901760
+rss_overhead_ratio:0.46
+rss_overhead_bytes:-4800512
+mem_fragmentation_ratio:4.73
+mem_fragmentation_bytes:3190472
+mem_not_counted_for_evict:0
+mem_replication_backlog:0
+mem_clients_slaves:0
+mem_clients_normal:49694
+mem_aof_buffer:0
+mem_allocator:jemalloc-5.1.0
+active_defrag_running:0
+lazyfree_pending_objects:0
+
+# Persistence
+loading:0
+rdb_changes_since_last_save:1
+rdb_bgsave_in_progress:0
+rdb_last_save_time:1577700205
+rdb_last_bgsave_status:ok
+rdb_last_bgsave_time_sec:-1
+rdb_current_bgsave_time_sec:-1
+rdb_last_cow_size:0
+aof_enabled:0
+aof_rewrite_in_progress:0
+aof_rewrite_scheduled:0
+aof_last_rewrite_time_sec:-1
+aof_current_rewrite_time_sec:-1
+aof_last_bgrewrite_status:ok
+aof_last_write_status:ok
+aof_last_cow_size:0
+
+# Stats
+total_connections_received:6
+total_commands_processed:32
+instantaneous_ops_per_sec:0
+total_net_input_bytes:6643
+total_net_output_bytes:31254
+instantaneous_input_kbps:0.00
+instantaneous_output_kbps:0.00
+rejected_connections:0
+sync_full:0
+sync_partial_ok:0
+sync_partial_err:0
+expired_keys:1
+expired_stale_perc:0.00
+expired_time_cap_reached_count:0
+evicted_keys:0
+keyspace_hits:0
+keyspace_misses:11
+pubsub_channels:0
+pubsub_patterns:0
+latest_fork_usec:0
+migrate_cached_sockets:0
+slave_expires_tracked_keys:0
+active_defrag_hits:0
+active_defrag_misses:0
+active_defrag_key_hits:0
+active_defrag_key_misses:0
+
+# Replication
+role:master
+connected_slaves:0
+master_replid:4ca161d4b9cc62b01bb87b9084a71ff229d0bda8
+master_replid2:0000000000000000000000000000000000000000
+master_repl_offset:0
+second_repl_offset:-1
+repl_backlog_active:0
+repl_backlog_size:1048576
+repl_backlog_first_byte_offset:0
+repl_backlog_histlen:0
+
+# CPU
+used_cpu_sys:4.571514
+used_cpu_user:1.065946
+used_cpu_sys_children:0.002352
+used_cpu_user_children:0.001369
+
+# Cluster
+cluster_enabled:0
+
+# Keyspace
+db0:keys=38,expires=0,avg_ttl=0`;
+
+  return defaultInfo;
+}

test/commands/info.js

@@ -0,0 +1,24 @@
+import expect from 'expect';
+
+import MockRedis from '../../src';
+
+describe('info', () => {
+  it('should return the specific info', () => {
+    const info = `#Server
+    redis_version:5.0.7`;
+    const redis = new MockRedis({
+      data: {
+        info,
+      },
+    });
+    return redis.info().then(value => {
+      expect(value).toEqual(info);
+    });
+  });
+  it('should return default info', () => {
+    const redis = new MockRedis();
+    return redis.info().then(value => {
+      expect(value).toMatch(/redis_version/g);
+    });
+  });
+});