allow passing 0, false or nil as the "wait" parameter to disable wait…

…ing, fixes #39

README.md

@@ -43,6 +43,7 @@ Octopoller exposes a single function `poll`. Here is what the API looks like:
 #
 # wait      - The time delay in seconds between polls (default is 1 second)
 #           - When given the argument `:exponentially` the action will be retried with exponetial backoff
+#           - When given 0, false or nil, the action will be retried without wait
 # timeout   - The maximum number of seconds the poller will execute
 # retries   - The maximum number of times the action will be retried
 # yield     - A block that will execute, and if `:re_poll` is returned it will re-run

lib/octopoller.rb

@@ -16,6 +16,8 @@ class TooManyAttemptsError < StandardError; end
   # raise     - Raises an Octopoller::TimeoutError if the timeout is reached
   # raise     - Raises an Octopoller::TooManyAttemptsError if the retries is reached
   def poll(wait: 1, timeout: nil, retries: nil)
+    wait = 0 if [nil, false].include?(wait)
+
     Octopoller.validate_arguments(wait, timeout, retries)
     exponential_backoff = (wait == :exponentially)
 
@@ -45,7 +47,7 @@ def self.validate_arguments(wait, timeout, retries)
       raise ArgumentError, "Must pass an argument to either `timeout` or `retries`"
     end
     exponential_backoff = wait == :exponentially
-    raise ArgumentError, "Cannot wait backwards in time" unless exponential_backoff || wait.positive?
+    raise ArgumentError, "Cannot wait backwards in time" if !exponential_backoff && wait.negative?
     raise ArgumentError, "Timed out without even being able to try" if timeout&.negative?
     raise ArgumentError, "Cannot retry something a negative number of times" if retries&.negative?
   end

spec/octopoller_spec.rb

@@ -14,9 +14,26 @@
         .to raise_error(ArgumentError, "Timed out without even being able to try")
     end
 
+    it "polls without wait" do
+      [0, false, nil].each do |wait|
+        tries, start, duration = 0, Time.now, nil
+        result = Octopoller.poll(wait: wait, timeout: 0.05) do
+          tries += 1
+          if tries == 3
+            duration = Time.now - start
+            "Success!"
+          else
+            :re_poll
+          end
+        end
+        expect(result).to eq("Success!")
+        expect(duration).to be < 0.1
+      end
+    end
+
     it "polls until timeout" do
       expect do
-        Octopoller.poll(wait: 0.01, timeout: 0.05) do
+        Octopoller.poll(wait: false, timeout: 0.05) do
           :re_poll
         end
       end.to raise_error(Octopoller::TimeoutError, "Polling timed out patiently")
@@ -29,7 +46,7 @@
 
     it "polls until successful return" do
       polled = false
-      result = Octopoller.poll(wait: 0.01, timeout: 1) do
+      result = Octopoller.poll(wait: false, timeout: 1) do
         if polled
           "Success!"
         else
@@ -42,7 +59,7 @@
 
     it "doesn't swallow a raised error" do
       expect do
-        Octopoller.poll(wait: 0.01, timeout: 0.01) do
+        Octopoller.poll(wait: false, timeout: 0.01) do
           raise StandardError, "An error occuered"
         end
       end.to raise_error(StandardError, "An error occuered")
@@ -61,12 +78,12 @@
     end
 
     it "accepts 0 retries" do
-      expect { Octopoller.poll(wait: 0.01, retries: 0) {} }.to_not raise_error
+      expect { Octopoller.poll(wait: false, retries: 0) {} }.to_not raise_error
     end
 
     it "poll until max retries reached" do
       expect do
-        Octopoller.poll(wait: 0.01, retries: 2) do
+        Octopoller.poll(wait: false, retries: 2) do
           :re_poll
         end
       end.to raise_error(Octopoller::TooManyAttemptsError, "Polled maximum number of attempts")
@@ -75,7 +92,7 @@
     it "tries exactly the number of retries" do
       attempts = 0
       expect do
-        Octopoller.poll(wait: 0.01, retries: 3) do
+        Octopoller.poll(wait: false, retries: 3) do
           attempts += 1
           :re_poll
         end
@@ -107,7 +124,7 @@
 
     it "try until successful return" do
       tried = false
-      result = Octopoller.poll(wait: 0.01, retries: 1) do
+      result = Octopoller.poll(wait: false, retries: 1) do
         if tried
           "Success!"
         else
@@ -120,7 +137,7 @@
 
     it "doesn't swallow a raised error" do
       expect do
-        Octopoller.poll(wait: 0.01, retries: 0) do
+        Octopoller.poll(wait: false, retries: 0) do
           raise StandardError, "An error occured"
         end
       end.to raise_error(StandardError, "An error occured")