Accept Proc as a namespace (#203)

Co-authored-by: Lokanadham <lokanadham.m@voonik.com>

Co-authored-by: Lokanadham <lokanadham.m@voonik.com>

CHANGELOG.md

@@ -2,6 +2,7 @@
 
 ## x.y.z
 
+- Accept Proc as a namespace (#203)
 - Fix deprecation warning of Redis.current (#189)
 - Add support for getex
 

README.md

@@ -33,6 +33,13 @@ redis_connection.get('ns:foo')
 # => nil
 ```
 
+Redis::Namespace also supports `Proc` as a namespace and will take the result string as namespace at runtime.
+
+```ruby
+redis_connection = Redis.new
+namespaced_redis = Redis::Namespace.new(Proc.new { Tenant.current_tenant }, redis: redis_connection)
+```
+
 Installation
 ============
 

lib/redis/namespace.rb

@@ -309,15 +309,15 @@ def namespace(desired_namespace = nil)
                                    :redis => @redis)
       end
 
-      @namespace
+      @namespace.respond_to?(:call) ? @namespace.call : @namespace
     end
 
     def full_namespace
       redis.is_a?(Namespace) ? "#{redis.full_namespace}:#{namespace}" : namespace.to_s
     end
 
     def connection
-      @redis.connection.tap { |info| info[:namespace] = @namespace }
+      @redis.connection.tap { |info| info[:namespace] = namespace }
     end
 
     def exec
@@ -541,7 +541,7 @@ def namespaced_block(command, &block)
     end
 
     def add_namespace(key)
-      return key unless key && @namespace
+      return key unless key && namespace
 
       case key
       when Array
@@ -550,12 +550,12 @@ def add_namespace(key)
         key.keys.each {|k| key[add_namespace(k)] = key.delete(k)}
         key
       else
-        "#{@namespace}:#{key}"
+        "#{namespace}:#{key}"
       end
     end
 
     def rem_namespace(key)
-      return key unless key && @namespace
+      return key unless key && namespace
 
       case key
       when Array
@@ -567,7 +567,7 @@ def rem_namespace(key)
           key.each { |k| yielder.yield rem_namespace(k) }
         end
       else
-        key.to_s.sub(/\A#{@namespace}:/, '')
+        key.to_s.sub(/\A#{namespace}:/, '')
       end
     end
 

spec/redis_spec.rb

@@ -41,6 +41,17 @@
     expect(@namespaced.type('counter')).to eq('string')
   end
 
+  it "should work with Proc namespaces" do
+    namespace = Proc.new { :dynamic_ns }
+    namespaced = Redis::Namespace.new(namespace, redis: @redis)
+
+    expect(namespaced.get('foo')).to eq(nil)
+    namespaced.set('foo', 'chris')
+    expect(namespaced.get('foo')).to eq('chris')
+    @redis.set('foo', 'bob')
+    expect(@redis.get('foo')).to eq('bob')
+  end
+
   context 'when sending capital commands (issue 68)' do
     it 'should be able to use a namespace' do
       @namespaced.send('SET', 'fubar', 'quux')