NodeJS Reference

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This document describes specific NodeJS build and deploy configurations.

Function and handler

exports.handler = function(context, event) {
    context.callback('');
};

The handler field is of the form <package>:<entrypoint>, where <package> is a dot (.) separated path (for example, foo.bar equates to foo/bar.js) and <entrypoint> is the function name. In the example above, the handler is handler:handler, assuming the file is named handler.js.

Note

A temporary limitation mandates that the file be named handler.js.

Dockerfile

See Deploying Functions from a Dockerfile.

ARG NUCLIO_LABEL=0.5.6
ARG NUCLIO_ARCH=amd64
ARG NUCLIO_BASE_IMAGE=node:10.3-alpine
ARG NUCLIO_ONBUILD_IMAGE=nuclio/handler-builder-nodejs-onbuild:${NUCLIO_LABEL}-${NUCLIO_ARCH}

# Supplies processor uhttpc, used for healthcheck
FROM nuclio/uhttpc:0.0.1-amd64 as uhttpc

# Supplies processor binary, wrapper
FROM ${NUCLIO_ONBUILD_IMAGE} as processor

# From the base image
FROM ${NUCLIO_BASE_IMAGE}

# Copy required objects from the suppliers
COPY --from=processor /home/nuclio/bin/processor /usr/local/bin/processor
COPY --from=processor /home/nuclio/bin/wrapper.js /opt/nuclio/wrapper.js
COPY --from=uhttpc /home/nuclio/bin/uhttpc /usr/local/bin/uhttpc

# Copy the handler directory to /opt/nuclio
COPY . /opt/nuclio

# Readiness probe
HEALTHCHECK --interval=1s --timeout=3s CMD /usr/local/bin/uhttpc --url http://127.0.0.1:8082/ready || exit 1

# Set node modules path
ENV NODE_PATH=/usr/local/lib/node_modules

# Run processor with configuration and platform configuration
CMD [ "processor", "--config", "/etc/nuclio/config/processor/processor.yaml", "--platform-config", "/etc/nuclio/config/platform/platform.yaml" ]