Add gRPC options to set timeout and skip dial errors (#193)

* Don't bubble up grpc client error, just keep it nil and derive it again on checking.

Add option to check if we should faild on gRCP dial error or not.

Add timeout option.

* Instead of attempting on each check, remove with block when fail on dial error is not set to true so gRPC takes care of the connection itself.
Add tests to check that auth fails with dial errors, but works once the service is back up.

* Fix docker files missing libwebsockets8 by building from source, fix docker test run by starting maridb service instead of mysql one.

Co-authored-by: Ignacio Gómez <ignacio_gomez@apple.com>

Dockerfile

@@ -32,7 +32,7 @@ RUN if [ "$(echo $MOSQUITTO_VERSION | head -c 1)" != 2 ]; then \
         make -j "$(nproc)" && \
         rm -rf /root/.cmake ; \
     fi
-    
+
 WORKDIR /app
 
 RUN mkdir -p mosquitto/auth mosquitto/conf.d
@@ -60,7 +60,7 @@ ARG BUILDPLATFORM
 
 # Install TARGETPLATFORM parser to translate its value to GOOS, GOARCH, and GOARM
 COPY --from=tonistiigi/xx:golang / /
-RUN go env 
+RUN go env
 
 # Install needed libc and gcc for target platform.
 RUN if [ ! -z "$TARGETPLATFORM" ]; then \
@@ -89,9 +89,34 @@ RUN go build -buildmode=c-archive go-auth.go && \
 #Start from a new image.
 FROM debian:stable-slim
 
-RUN apt update && apt install -y libwebsockets8 libc-ares2 openssl uuid tini
+RUN apt update && apt install -y libc-ares2 openssl uuid tini
+
+# Get libwebsocket. Debian's libwebsockets is too old for Mosquitto version > 2.x so it gets built from source.
+RUN if [ "$(echo $MOSQUITTO_VERSION | head -c 1)" != 2 ]; then \
+        apt install -y libwebsockets-dev ; \
+    else \
+        export LWS_VERSION=2.4.2  && \
+        wget https://github.com/warmcat/libwebsockets/archive/v${LWS_VERSION}.tar.gz -O /tmp/lws.tar.gz && \
+        mkdir -p /build/lws && \
+        tar --strip=1 -xf /tmp/lws.tar.gz -C /build/lws && \
+        rm /tmp/lws.tar.gz && \
+        cd /build/lws && \
+        cmake . \
+            -DCMAKE_BUILD_TYPE=MinSizeRel \
+            -DCMAKE_INSTALL_PREFIX=/usr \
+            -DLWS_IPV6=ON \
+            -DLWS_WITHOUT_BUILTIN_GETIFADDRS=ON \
+            -DLWS_WITHOUT_CLIENT=ON \
+            -DLWS_WITHOUT_EXTENSIONS=ON \
+            -DLWS_WITHOUT_TESTAPPS=ON \
+            -DLWS_WITH_SHARED=OFF \
+            -DLWS_WITH_ZIP_FOPS=OFF \
+            -DLWS_WITH_ZLIB=OFF && \
+        make -j "$(nproc)" && \
+        rm -rf /root/.cmake ; \
+    fi
 
-RUN mkdir -p /var/lib/mosquitto /var/log/mosquitto 
+RUN mkdir -p /var/lib/mosquitto /var/log/mosquitto
 RUN groupadd mosquitto \
     && useradd -s /sbin/nologin mosquitto -g mosquitto -d /var/lib/mosquitto \
     && chown -R mosquitto:mosquitto /var/log/mosquitto/ \

Dockerfile.runtest

@@ -11,11 +11,36 @@ ENV GO_VERSION=1.13.8
 WORKDIR /app
 
 #Get mosquitto build dependencies.
-RUN apt-get update && apt-get install -y libwebsockets8 libwebsockets-dev libc-ares2 libc-ares-dev openssl uuid uuid-dev wget build-essential git
+RUN apt-get update && apt-get install -y libc-ares2 libc-ares-dev openssl uuid uuid-dev wget build-essential git
+
+RUN if [ "$(echo $MOSQUITTO_VERSION | head -c 1)" != 2 ]; then \
+        apt install -y libwebsockets-dev ; \
+    else \
+        export LWS_VERSION=2.4.2  && \
+        wget https://github.com/warmcat/libwebsockets/archive/v${LWS_VERSION}.tar.gz -O /tmp/lws.tar.gz && \
+        mkdir -p /build/lws && \
+        tar --strip=1 -xf /tmp/lws.tar.gz -C /build/lws && \
+        rm /tmp/lws.tar.gz && \
+        cd /build/lws && \
+        cmake . \
+            -DCMAKE_BUILD_TYPE=MinSizeRel \
+            -DCMAKE_INSTALL_PREFIX=/usr \
+            -DLWS_IPV6=ON \
+            -DLWS_WITHOUT_BUILTIN_GETIFADDRS=ON \
+            -DLWS_WITHOUT_CLIENT=ON \
+            -DLWS_WITHOUT_EXTENSIONS=ON \
+            -DLWS_WITHOUT_TESTAPPS=ON \
+            -DLWS_WITH_SHARED=OFF \
+            -DLWS_WITH_ZIP_FOPS=OFF \
+            -DLWS_WITH_ZLIB=OFF && \
+        make -j "$(nproc)" && \
+        rm -rf /root/.cmake ; \
+    fi
+
 RUN mkdir -p mosquitto/auth mosquitto/conf.d
 
 RUN wget http://mosquitto.org/files/source/mosquitto-${MOSQUITTO_VERSION}.tar.gz
-RUN tar xzvf mosquitto-${MOSQUITTO_VERSION}.tar.gz && rm mosquitto-${MOSQUITTO_VERSION}.tar.gz 
+RUN tar xzvf mosquitto-${MOSQUITTO_VERSION}.tar.gz && rm mosquitto-${MOSQUITTO_VERSION}.tar.gz
 
 #Build mosquitto.
 RUN cd mosquitto-${MOSQUITTO_VERSION} && make WITH_WEBSOCKETS=yes && make install && cd ..