added target in makefile for building Windows artifacts and updated g…

…ithub workflow to run the same

In order to build Windows artifacts, we have added a target for the same in Makefile. We are using a cross-compiler to build Windows artifacts.

Also, we have added this target in the Github action.

To ensure that customers building their own plugins can build Windows binaries for different architectures and using different cross-compilers, these build settings are customizable.

.github/workflows/build.yml

@@ -19,11 +19,14 @@ jobs:
         go-version: 1.17
       id: go
 
+    - name: Install cross-compiler for Windows
+      run: sudo apt-get install -y gcc-multilib gcc-mingw-w64
+
     - name: Check out code into the Go module directory
       uses: actions/checkout@v2
 
     - name: golint
       run: go get -u golang.org/x/lint/golint
 
     - name: Build
-      run: make build test
+      run: make build windows-release test

Makefile

@@ -11,6 +11,10 @@
 # ANY KIND, either express or implied. See the License for the specific
 # language governing permissions and limitations under the License.
 
+# Build settings.
+GOARCH ?= amd64
+COMPILER ?= x86_64-w64-mingw32-gcc # Cross-compiler for Windows
+
 ROOT := $(shell pwd)
 
 all: build
@@ -34,6 +38,12 @@ release:
 	go build -buildmode c-shared -o ./bin/firehose.so ./
 	@echo "Built Amazon Kinesis Data Firehose Fluent Bit Plugin"
 
+.PHONY: windows-release
+windows-release:
+	mkdir -p ./bin
+	GOOS=windows GOARCH=$(GOARCH) CGO_ENABLED=1 CC=$(COMPILER) go build -buildmode c-shared -o ./bin/firehose.dll ./
+	@echo "Built Amazon Kinesis Data Firehose Fluent Bit Plugin for Windows"
+
 .PHONY: generate
 generate: $(SOURCES)
 	PATH=$(SCRIPT_PATH) go generate ./...

README.md

@@ -16,9 +16,20 @@ Run `make` to build `./bin/firehose.so`. Then use with Fluent Bit:
 ./fluent-bit -e ./firehose.so -i cpu \
 -o firehose \
 -p "region=us-west-2" \
--p "delivery-stream=example-stream"
+-p "delivery_stream=example-stream"
 ```
 
+For building Windows binaries, we need to install `mingw-64w` for cross-compilation. The same can be done using-
+```
+sudo apt-get install -y gcc-multilib gcc-mingw-w64
+```
+After this step, run `make windows-release` to build `./bin/firehose.dll`. Then use with Fluent Bit on Windows:
+```
+./fluent-bit.exe -e ./firehose.dll -i dummy `
+-o firehose `
+-p "region=us-west-2" `
+-p "delivery_stream=example-stream"
+```
 ### Plugin Options
 
 * `region`: The region which your Firehose delivery stream(s) is/are in.