Add Streams support

.travis.yml

@@ -52,6 +52,8 @@ matrix:
       env: DRIVER=ruby REDIS_BRANCH=3.2 LOW_TIMEOUT=0.3
     - rvm: jruby-9.1.17.0
       env: DRIVER=ruby REDIS_BRANCH=4.0 LOW_TIMEOUT=0.3
+    - rvm: 2.5.3
+      env: DRIVER=ruby REDIS_BRANCH=5.0
 
 notifications:
   irc:

lib/redis.rb

@@ -2808,6 +2808,322 @@ def geodist(key, member1, member2, unit = 'm')
     end
   end
 
+  # Returns the stream information each subcommand.
+  #
+  # @example stream
+  #   redis.xinfo(:stream, 'mystream')
+  # @example groups
+  #   redis.xinfo(:groups, 'mystream')
+  # @example consumers
+  #   redis.xinfo(:consumers, 'mystream', 'mygroup')
+  #
+  # @param subcommand [String] e.g. `stream` `groups` `consumers`
+  # @param key        [String] the stream key
+  # @param group      [String] the consumer group name, required if subcommand is `consumers`
+  #
+  # @return [Hash]        information of the stream if subcommand is `stream`
+  # @return [Array<Hash>] information of the consumer groups if subcommand is `groups`
+  # @return [Array<Hash>] information of the consumers if subcommand is `consumers`
+  def xinfo(subcommand, key, group = nil)
+    args = [:xinfo, subcommand, key, group].compact
+    synchronize do |client|
+      client.call(args) do |reply|
+        case subcommand.to_s.downcase
+        when 'stream'              then Hashify.call(reply)
+        when 'groups', 'consumers' then reply.map { |arr| Hashify.call(arr) }
+        else reply
+        end
+      end
+    end
+  end
+
+  # Add new entry to the stream.
+  #
+  # @example Without options
+  #   redis.xadd('mystream', f1: 'v1', f2: 'v2')
+  # @example With options
+  #   redis.xadd('mystream', { f1: 'v1', f2: 'v2' }, id: '0-0', maxlen: 1000, approximate: true)
+  #
+  # @param key   [String] the stream key
+  # @param entry [Hash]   one or multiple field-value pairs
+  # @param opts  [Hash]   several options for `XADD` command
+  #
+  # @option opts [String]  :id          the entry id, default value is `*`, it means auto generation
+  # @option opts [Integer] :maxlen      max length of entries
+  # @option opts [Boolean] :approximate whether to add `~` modifier of maxlen or not
+  #
+  # @return [String] the entry id
+  def xadd(key, entry, opts = {})
+    args = [:xadd, key]
+    args.concat(['MAXLEN', (opts[:approximate] ? '~' : nil), opts[:maxlen]].compact) if opts[:maxlen]
+    args << (opts[:id] || '*')
+    args.concat(entry.to_a.flatten)
+    synchronize { |client| client.call(args) }
+  end
+
+  # Trims older entries of the stream if needed.
+  #
+  # @example Without options
+  #   redis.xtrim('mystream', 1000)
+  # @example With options
+  #   redis.xtrim('mystream', 1000, approximate: true)
+  #
+  # @param key         [String]  the stream key
+  # @param mexlen      [Integer] max length of entries
+  # @param approximate [Boolean] whether to add `~` modifier of maxlen or not
+  #
+  # @return [Integer] the number of entries actually deleted
+  def xtrim(key, maxlen, approximate: false)
+    args = [:xtrim, key, 'MAXLEN', (approximate ? '~' : nil), maxlen].compact
+    synchronize { |client| client.call(args) }
+  end
+
+  # Delete entries by entry ids.
+  #
+  # @example With splatted entry ids
+  #   redis.xdel('mystream', '0-1', '0-2')
+  # @example With arrayed entry ids
+  #   redis.xdel('mystream', ['0-1', '0-2'])
+  #
+  # @param key [String]        the stream key
+  # @param ids [Array<String>] one or multiple entry ids
+  #
+  # @return [Integer] the number of entries actually deleted
+  def xdel(key, *ids)
+    args = [:xdel, key].concat(ids.flatten)
+    synchronize { |client| client.call(args) }
+  end
+
+  # Fetches entries of the stream.
+  #
+  # @example Without options
+  #   redis.xrange('mystream')
+  # @example With first entry id option
+  #   redis.xrange('mystream', first: '0-1')
+  # @example With first and last entry id options
+  #   redis.xrange('mystream', first: '0-1', last: '0-3')
+  # @example With count options
+  #   redis.xrange('mystream', count: 10)
+  #
+  # @param key   [String]  the stream key
+  # @param first [String]  first entry id of range, default value is `-`
+  # @param last  [String]  last entry id of range, default value is `+`
+  # @param count [Integer] the number of entries as limit
+  #
+  # @return [Hash{String => Hash}] the entries
+  def xrange(key, first: '-', last: '+', count: nil)
+    args = [:xrange, key, first, last]
+    args.concat(['COUNT', count]) if count
+    synchronize { |client| client.call(args, &HashifyStreamEntries) }
+  end
+
+  # Fetches entries of the stream in descending order.
+  #
+  # @example Without options
+  #   redis.xrevrange('mystream')
+  # @example With first entry id option
+  #   redis.xrevrange('mystream', first: '0-1')
+  # @example With first and last entry id options
+  #   redis.xrevrange('mystream', first: '0-1', last: '0-3')
+  # @example With count options
+  #   redis.xrevrange('mystream', count: 10)
+  #
+  # @param key   [String]  the stream key
+  # @param first [String]  first entry id of range, default value is `-`
+  # @param last  [String]  last entry id of range, default value is `+`
+  # @param count [Integer] the number of entries as limit
+  #
+  # @return [Hash{String => Hash}] the entries
+  def xrevrange(key, first: '-', last: '+', count: nil)
+    args = [:xrevrange, key, last, first]
+    args.concat(['COUNT', count]) if count
+    synchronize { |client| client.call(args, &HashifyStreamEntries) }
+  end
+
+  # Returns the number of entries inside a stream.
+  #
+  # @example With key
+  #   redis.xlen('mystream')
+  #
+  # @param key [String] the stream key
+  #
+  # @return [Integer] the number of entries
+  def xlen(key)
+    synchronize { |client| client.call([:xlen, key]) }
+  end
+
+  # Fetches entries from one or multiple streams. Optionally blocking.
+  #
+  # @example With a key
+  #   redis.xread('mystream', '0-0')
+  # @example With multiple keys
+  #   redis.xread(%w[mystream1 mystream2], %w[0-0 0-0])
+  # @example With count option
+  #   redis.xread('mystream', '0-0', count: 2)
+  # @example With block option
+  #   redis.xread('mystream', '$', block: 1000)
+  #
+  # @param keys  [Array<String>] one or multiple stream keys
+  # @param ids   [Array<String>] one or multiple entry ids
+  # @param count [Integer]       the number of entries as limit per stream
+  # @param block [Integer]       the number of milliseconds as blocking timeout
+  #
+  # @return [Hash{String => Hash{String => Hash}}] the entries
+  def xread(keys, ids, count: nil, block: nil)
+    args = [:xread]
+    args.concat(['COUNT', count])      if count
+    args.concat(['BLOCK', block.to_i]) if block
+    _xread(args, keys, ids, block)
+  end
+
+  # Manages the consumer group of the stream.
+  #
+  # @example With `create` subcommand
+  #   redis.xgroup(:create, 'mystream', 'mygroup', '$')
+  # @example With `setid` subcommand
+  #   redis.xgroup(:setid, 'mystream', 'mygroup', '$')
+  # @example With `destroy` subcommand
+  #   redis.xgroup(:destroy, 'mystream', 'mygroup')
+  # @example With `delconsumer` subcommand
+  #   redis.xgroup(:delconsumer, 'mystream', 'mygroup', 'consumer1')
+  #
+  # @param subcommand     [String] `create` `setid` `destroy` `delconsumer`
+  # @param key            [String] the stream key
+  # @param group          [String] the consumer group name
+  # @param id_or_consumer [String]
+  #   * the entry id or `$`, required if subcommand is `create` or `setid`
+  #   * the consumer name, required if subcommand is `delconsumer`
+  # @param mkstream [Boolean] whether to create an empty stream automatically or not
+  #
+  # @return [String] `OK` if subcommand is `create` or `setid`
+  # @return [Integer] effected count if subcommand is `destroy` or `delconsumer`
+  def xgroup(subcommand, key, group, id_or_consumer = nil, mkstream: false)
+    args = [:xgroup, subcommand, key, group, id_or_consumer, (mkstream ? 'MKSTREAM' : nil)].compact
+    synchronize { |client| client.call(args) }
+  end
+
+  # Fetches a subset of the entries from one or multiple streams related with the consumer group.
+  # Optionally blocking.
+  #
+  # @example With a key
+  #   redis.xreadgroup('mygroup', 'consumer1', 'mystream', '>')
+  # @example With multiple keys
+  #   redis.xreadgroup('mygroup', 'consumer1', %w[mystream1 mystream2], %w[> >])
+  # @example With count option
+  #   redis.xreadgroup('mygroup', 'consumer1', 'mystream', '>', count: 2)
+  # @example With block option
+  #   redis.xreadgroup('mygroup', 'consumer1', 'mystream', '>', block: 1000)
+  # @example With noack option
+  #   redis.xreadgroup('mygroup', 'consumer1', 'mystream', '>', noack: true)
+  #
+  # @param group    [String]        the consumer group name
+  # @param consumer [String]        the consumer name
+  # @param keys     [Array<String>] one or multiple stream keys
+  # @param ids      [Array<String>] one or multiple entry ids
+  # @param opts     [Hash]          several options for `XREADGROUP` command
+  #
+  # @option opts [Integer] :count the number of entries as limit
+  # @option opts [Integer] :block the number of milliseconds as blocking timeout
+  # @option opts [Boolean] :noack whether message loss is acceptable or not
+  #
+  # @return [Hash{String => Hash{String => Hash}}] the entries
+  def xreadgroup(group, consumer, keys, ids, opts = {})
+    args = [:xreadgroup, 'GROUP', group, consumer]
+    args.concat(['COUNT', opts[:count]])      if opts[:count]
+    args.concat(['BLOCK', opts[:block].to_i]) if opts[:block]
+    args << 'NOACK'                           if opts[:noack]
+    _xread(args, keys, ids, opts[:block])
+  end
+
+  # Removes one or multiple entries from the pending entries list of a stream consumer group.
+  #
+  # @example With a entry id
+  #   redis.xack('mystream', 'mygroup', '1526569495631-0')
+  # @example With splatted entry ids
+  #   redis.xack('mystream', 'mygroup', '0-1', '0-2')
+  # @example With arrayed entry ids
+  #   redis.xack('mystream', 'mygroup', %w[0-1 0-2])
+  #
+  # @param key   [String]        the stream key
+  # @param group [String]        the consumer group name
+  # @param ids   [Array<String>] one or multiple entry ids
+  #
+  # @return [Integer] the number of entries successfully acknowledged
+  def xack(key, group, *ids)
+    args = [:xack, key, group].concat(ids.flatten)
+    synchronize { |client| client.call(args) }
+  end
+
+  # Changes the ownership of a pending entry
+  #
+  # @example With splatted entry ids
+  #   redis.xclaim('mystream', 'mygroup', 'consumer1', 3600000, '0-1', '0-2')
+  # @example With arrayed entry ids
+  #   redis.xclaim('mystream', 'mygroup', 'consumer1', 3600000, %w[0-1 0-2])
+  # @example With idle option
+  #   redis.xclaim('mystream', 'mygroup', 'consumer1', 3600000, %w[0-1 0-2], idle: 1000)
+  # @example With time option
+  #   redis.xclaim('mystream', 'mygroup', 'consumer1', 3600000, %w[0-1 0-2], time: 1542866959000)
+  # @example With retrycount option
+  #   redis.xclaim('mystream', 'mygroup', 'consumer1', 3600000, %w[0-1 0-2], retrycount: 10)
+  # @example With force option
+  #   redis.xclaim('mystream', 'mygroup', 'consumer1', 3600000, %w[0-1 0-2], force: true)
+  # @example With justid option
+  #   redis.xclaim('mystream', 'mygroup', 'consumer1', 3600000, %w[0-1 0-2], justid: true)
+  #
+  # @param key           [String]        the stream key
+  # @param group         [String]        the consumer group name
+  # @param consumer      [String]        the consumer name
+  # @param min_idle_time [Integer]       the number of milliseconds
+  # @param ids           [Array<String>] one or multiple entry ids
+  # @param opts          [Hash]          several options for `XCLAIM` command
+  #
+  # @option opts [Integer] :idle       the number of milliseconds as last time it was delivered of the entry
+  # @option opts [Integer] :time       the number of milliseconds as a specific Unix Epoch time
+  # @option opts [Integer] :retrycount the number of retry counter
+  # @option opts [Boolean] :force      whether to create the pending entry to the pending entries list or not
+  # @option opts [Boolean] :justid     whether to fetch just an array of entry ids or not
+  #
+  # @return [Hash{String => Hash}] the entries successfully claimed
+  # @return [Array<String>]        the entry ids successfully claimed if justid option is `true`
+  def xclaim(key, group, consumer, min_idle_time, *ids, **opts)
+    args = [:xclaim, key, group, consumer, min_idle_time].concat(ids.flatten)
+    args.concat(['IDLE',       opts[:idle].to_i])  if opts[:idle]
+    args.concat(['TIME',       opts[:time].to_i])  if opts[:time]
+    args.concat(['RETRYCOUNT', opts[:retrycount]]) if opts[:retrycount]
+    args << 'FORCE'                                if opts[:force]
+    args << 'JUSTID'                               if opts[:justid]
+    blk = opts[:justid] ? Noop : HashifyStreamEntries
+    synchronize { |client| client.call(args, &blk) }
+  end
+
+  # Fetches not acknowledging pending entries
+  #
+  # @example With key and group
+  #   redis.xpending('mystream', 'mygroup')
+  # @example With range options
+  #   redis.xpending('mystream', 'mygroup', first: '-', last: '+', count: 10)
+  # @example With range and consumer options
+  #   redis.xpending('mystream', 'mygroup', 'consumer1', first: '-', last: '+', count: 10)
+  #
+  # @param key      [String] the stream key
+  # @param group    [String] the consumer group name
+  # @param consumer [String] the consumer name
+  # @param opts     [Hash]   several options for `XPENDING` command
+  #
+  # @option opts [String]  :first first entry id of range
+  # @option opts [String]  :last  last entry id of range
+  # @option opts [Integer] :count the number of entries as limit
+  #
+  # @return [Hash]        the summary of pending entries
+  # @return [Array<Hash>] the pending entries details if options were specified
+  def xpending(key, group, consumer = nil, **opts)
+    args = [:xpending, key, group, opts[:first], opts[:last], opts[:count], consumer].compact
+    summary_needed = consumer.nil? && opts.empty?
+    blk = summary_needed ? HashifyStreamPendings : HashifyStreamPendingDetails
+    synchronize { |client| client.call(args, &blk) }
+  end
+
   # Interact with the sentinel command (masters, master, slaves, failover)
   #
   # @param [String] subcommand e.g. `masters`, `master`, `slaves`
@@ -2953,6 +3269,43 @@ def method_missing(command, *args)
       end.compact]
     }
 
+  HashifyStreams =
+    lambda { |reply|
+      return {} if reply.nil?
+      reply.map do |stream_key, entries|
+        [stream_key, HashifyStreamEntries.call(entries)]
+      end.to_h
+    }
+
+  HashifyStreamEntries =
+    lambda { |reply|
+      reply.map do |entry_id, values|
+        [entry_id, values.each_slice(2).to_h]
+      end.to_h
+    }
+
+  HashifyStreamPendings =
+    lambda { |reply|
+      {
+        'size'         => reply[0],
+        'min_entry_id' => reply[1],
+        'max_entry_id' => reply[2],
+        'consumers'    => reply[3].nil? ? {} : Hash[reply[3]]
+      }
+    }
+
+  HashifyStreamPendingDetails =
+    lambda { |reply|
+      reply.map do |arr|
+        {
+          'entry_id' => arr[0],
+          'consumer' => arr[1],
+          'elapsed'  => arr[2],
+          'count'    => arr[3]
+        }
+      end
+    }
+
   HashifyClusterNodeInfo =
     lambda { |str|
       arr = str.split(' ')
@@ -3018,6 +3371,21 @@ def _subscription(method, timeout, channels, block)
       @client = original
     end
   end
+
+  def _xread(args, keys, ids, blocking_timeout_msec)
+    keys = keys.is_a?(Array) ? keys : [keys]
+    ids = ids.is_a?(Array) ? ids : [ids]
+    args.concat(['STREAMS'], keys, ids)
+
+    synchronize do |client|
+      if blocking_timeout_msec.nil?
+        client.call(args, &HashifyStreams)
+      else
+        timeout = client.timeout.to_f + blocking_timeout_msec.to_f / 1000.0
+        client.call_with_timeout(args, timeout, &HashifyStreams)
+      end
+    end
+  end
 end
 
 require_relative "redis/version"