Windows and OSX builds of the sidecar

This now means local development on Windows
and OSX is possible. Also added documentation
on how to run this process when developing locally
with Agon.

Closes agones-dev#8

Author: markmandel

build/Makefile

@@ -104,8 +104,12 @@ push-gameservers-controller-image: ensure-image
 
 # build the static binary for the gamesever sidecar
 build-gameservers-sidecar-binary: ensure-image
-	docker run --rm -e "CGO_ENABLED=0" $(common_mounts) --entrypoint=go $(build_tag) build \
-		-o $(mount_path)/gameservers/sidecar/bin/sidecar -a $(go_version_flags) -installsuffix cgo $(agon_package)/gameservers/sidecar
+	docker run --rm -e "CGO_ENABLED=0" $(common_mounts) $(build_tag) go build \
+		-o $(mount_path)/gameservers/sidecar/bin/sidecar.linux.amd64 -a $(go_version_flags) -installsuffix cgo $(agon_package)/gameservers/sidecar
+	docker run --rm -e "GOOS=darwin" -e "GOARCH=amd64" $(common_mounts) $(build_tag) go build \
+		-o $(mount_path)/gameservers/sidecar/bin/sidecar.darwin.amd64 $(go_version_flags) $(agon_package)/gameservers/sidecar
+	docker run --rm -e "GOOS=windows" -e "GOARCH=amd64" $(common_mounts) $(build_tag) go build \
+		-o $(mount_path)/gameservers/sidecar/bin/sidecar.windows.amd64.exe $(go_version_flags) $(agon_package)/gameservers/sidecar
 
 # Build the image for the gameserver sidecar
 build-gameservers-sidecar-image: ensure-image build-gameservers-sidecar-binary

build/README.md

@@ -38,21 +38,29 @@ Make sure you are in the `build` directory to start.
 
 First, let's test all the code. To do this, run `make test`, which will execute all the unit tests for the codebase. 
 
-If you haven't run any of the `build` make targets before then this will also create the build image, and then run the tests.
-Building the `build-image` may take a few minutes to download all the dependencies, so feel 
+If you haven't run any of the `build` make targets before then this will also create the Docker based build image,
+and then run the tests.
+
+Building the build image may take a few minutes to download all the dependencies, so feel 
 free to make cup of tea or coffee at this point. ☕️ 
 
 The build image is only created the first time one of the make targets is executed, and will only rebuild if the build
 Dockerfile has changed.
 
 Assuming that the tests all pass, let's go ahead an compile the code and build the Docker images that Agon consists of.
 
-To compile the code, create the Docker images, and compile and archive the sdks, 
-run `make build`. This will compile the code and create the docker image.
-You may note that the docker image is tagged with a concatenation of the upcoming release number and short git hash
-for the current commit. This has also been set in the code itself, so that it can be seen in log statements.
+Let's compile and build everything, by running `make build`, this will:
+
+- Compile the Agon Kubernetes integration code
+- Create the Docker images that we will later push
+- Build the local development tooling for all supported OS's
+- Compile and archive the SDKs in various languages
+
+You may note that docker images, and tar archives are tagged with a concatenation of the 
+upcoming release number and short git hash for the current commit. This has also been set in 
+the code itself, so that it can be seen in via log statements.
 
-Congratulations! You have now successfully tested and built Agon!  
+Congratulations! You have now successfully tested and built Agon!
 
 ### Running a Test Google Kubernetes Engine Cluster
 

gameservers/sidecar/Dockerfile

@@ -1,6 +1,6 @@
 FROM alpine:3.6
 
-COPY ./bin/sidecar /home/agon/sidecar
+COPY ./bin/sidecar.linux.amd64 /home/agon/sidecar
 RUN apk --update add ca-certificates && \
                 adduser -D agon && \
                 chown -R agon /home/agon && \

sdks/README.md

@@ -34,4 +34,35 @@ The GameServer state will be set `Shutdown` and the
 backing Pod will be deleted, if they have not shut themselves down already. 
 
 ## Local Development
-(Coming soon: Track [this bug](https://github.com/googleprivate/agon/issues/8) for details)
+_Note:_ There has yet to be a release of Agon, so if you want the local
+development tools, you will need to [build from source](build/README.md).
+
+If you do not wish to `make build` and build everything, 
+the `make` target `build-gameservers-sidecar-binary` will compile the necessary binaries
+for all supported operating systems (64 bit windows, linux and osx).
+
+You can find the binaries in the `bin` folder in [`gameservers/sidecar`](../gameservers/sidecar)
+once compilation is complete.
+
+When the game server is running on Agon, the SDK communicates over TCP to a small
+gRPC server that Agon coordinated to runs in a container in the same network 
+namespace as it - usually referred to in Kubernetes terms as a "sidecar".
+
+Therefore, when developing locally, we also need a process for the SDK to connect to!
+
+To do this, we can run the same binary that runs inside Agon, but pass in a flag
+to run it in "local mode". Local mode means that the sidecar binary
+won't try and connect to anything, and will just send logs messages to stdout so 
+that you can see exactly what the SDK in your game server is doing, and can
+confirm everything works.
+
+To run in local mode, pass the flag `--local` to the executable.
+
+For example:
+
+```bash
+$ ./sidecar.linux.amd64 --local
+{"level":"info","local":true,"msg":"Starting sdk sidecar","port":59357,"time":"2017-12-22T16:09:03-08:00","version":"0.1-5217b21"}
+{"level":"info","msg":"Ready request has been received!","time":"2017-12-22T16:09:19-08:00"}
+{"level":"info","msg":"Shutdown request has been received!","time":"2017-12-22T16:10:19-08:00"}
+```