FUNCTIONS AS A SERVICE
Some embodiments of the invention provide a method for providing a functions as a service (FaaS). The method is performed at a FaaS framework executing in a first cloud. The method receives a first API (Application Programming Interface) call invoking a particular function that is stored by for the FaaS framework. The method selects, from multiple cloud providers, a particular cloud provider for executing the particular function. The method sends executable code for the particular function in a format compatible with the selected particular cloud provider to the particular cloud provider to use to instantiate and execute the particular function.
1 . A method of providing a functions as a service (FaaS), the method comprising:
at a FaaS framework executing in a first cloud:
receiving a first API (Application Programming Interface) call invoking a particular function that is stored by for the FaaS framework;
selecting, from a plurality of cloud providers, a particular cloud provider for executing the particular function; and
sending executable code for the particular function in a format compatible with the selected particular cloud provider to the particular cloud provider to use to instantiate and execute the particular function.
2 . The method of claim 1 further comprising:
receiving, from the particular cloud provider, a result of a desired operation of the particular function; and
providing the result to a source of the first API call.
3 . The method of claim 2 , wherein after the particular cloud provider provides the result to the FaaS framework, the particular cloud provider discards the particular function.
4 . The method of claim 1 , wherein the executable code is written in a particular programming language, wherein identifying the particular cloud provider for executing the particular function comprises identifying a cloud provider that supports the particular programming language.
5 . The method of claim 4 , wherein when at least two different cloud providers support the particular programming language, identifying the particular cloud provider for executing the particular function comprises identifying a cloud provider associated with a lowest cost for executing the particular function.
6 . The method of claim 4 , wherein when at least two different cloud providers support the particular programming language, identifying the particular cloud provider for executing the particular function comprises identifying a cloud provider associated with a best set of performance metrics.
7 . The method of claim 4 , wherein when at least two different cloud providers support the particular programming language, identifying the particular cloud provider for executing the particular function comprises identifying a cloud provider having a most geographically proximate cloud with respect to the first machine.
8 . The method of claim 4 , wherein when at least two different cloud providers support the particular programming language, identifying the particular cloud provider for executing the particular function comprises randomly selecting a cloud provider from the at least two different cloud providers.
9 . The method of claim 4 , wherein when at least two different cloud providers support the particular programming language, identifying the particular cloud provider for executing the particular function comprises using a set of user-defined selection rules.
10 . The method of claim 1 , wherein the particular function is a first function in a plurality of functions stored by the FaaS framework, wherein to invoke the first function, the first API call comprises (i) a name of the first function, (ii) a particular programming language to be used at runtime of the first function, and (iii) a set of input values for the first function.
11 . The method of claim 10 , wherein sending executable code for the first function in the format compatible with the selected particular cloud provider comprises sending to the particular cloud provider a second API call comprising (i) the set of executable code in the particular programming language, (ii) the set of input values, and (iii) a set of credentials that allow the FaaS framework to access the particular cloud provider.
12 . The method of claim 10 , wherein the particular programming language is a first programming language in a plurality of programming language in which the plurality of functions stored by the FaaS framework are written, the method further comprising:
at the FaaS framework:
receiving a third API call invoking a second function that is stored by the FaaS framework, the third API call comprising (i) a name of the second function, (ii) a second programming language to be used at runtime of the second function, and (iii) a set of input values for the second function;
selecting, from the plurality of cloud providers, a second cloud provider for executing the second function; and
sending a fourth API call in a format compatible with the selected second cloud provider to the selected second cloud provider to use to instantiate and execute the second function, wherein the fourth API call comprises (i) a set of executable code for the second function in the particular programming language, (ii) the set of input values for the second function, and (iii) a second set of credentials that allow the FaaS framework to access the second cloud provider.
13 . The method of claim 10 , wherein the plurality of functions stored by the FaaS framework comprises a plurality of user-defined functions provided to the FaaS framework as part of a configuration of the FaaS framework.
14 . A non-transitory machine readable medium storing a program for execution by a set of processing units, the program for a FaaS (functions as a service) framework that executes in a first cloud to provide FaaS, the program comprising sets of instructions for:
receiving a first API (Application Programming Interface) call invoking a particular function that is stored by for the FaaS framework;
selecting, from a plurality of cloud providers, a particular cloud provider for executing the particular function; and
sending executable code for the particular function in a format compatible with the selected particular cloud provider to the particular cloud provider to use to instantiate and execute the particular function.
15 . The non-transitory machine readable medium of claim 14 , the program further comprising sets of instructions for:
receiving, from the particular cloud provider, a result of a desired operation of the particular function; and
providing the result to a source of the first API call, wherein after the particular cloud provider provides the result to the FaaS framework, the particular cloud provider discards the particular function.
16 . The non-transitory machine readable medium of claim 14 , wherein the executable code is written in a particular programming language, wherein identifying the particular cloud provider for executing the particular function comprises identifying a cloud provider that supports the particular programming language.
17 . The non-transitory machine readable medium of claim 16 , wherein when at least two different cloud providers support the particular programming language, the set of instructions for identifying the particular cloud provider for executing the particular function comprises a set of instructions for identifying a cloud provider associated with a lowest cost for executing the particular function.
18 . The non-transitory machine readable medium of claim 16 , wherein when at least two different cloud providers support the particular programming language, the set of instructions for identifying the particular cloud provider for executing the particular function comprises a set of instructions for identifying a cloud provider associated with a best set of performance metrics.
19 . The non-transitory machine readable medium of claim 16 , wherein when at least two different cloud providers support the particular programming language, the set of instructions for identifying the particular cloud provider for executing the particular function comprises a set of instructions for identifying a cloud provider having a most geographically proximate cloud with respect to the first machine.
20 . The non-transitory machine readable medium of claim 16 , wherein when at least two different cloud providers support the particular programming language, the set of instructions for identifying the particular cloud provider for executing the particular function comprises a set of instructions for randomly selecting a cloud provider from the at least two different cloud providers.