Multi publish

[zrzka]

Based on issue #38. It allows:

• use :alias with multiple functions
• it tries to update provided alias if it already exists

No tests, didn't find them for plugin. Tested on my projects. Hope I didn't overlook something.

[zrzka]

Was thinking about additional arguments that can allow fatal in case of create-alias! failure. Then decided not do it, because it complicates usage, adds another burden, ... If anyone uses :publish :alias XX he simply wants to publish with this alias regardless if it exists or not. Can be described in documentation / wiki.

[moea]

@robertvojta Thanks, I needed this. There's an ugly shell script which Travis runs, I'll add a line to it in the release branch.

[zrzka]

Yeah, I've got crazy scripts like this one too.

#!/bin/bash

deploy() {
    echo "Deploying $1 ..."
    if FN_VERSION=$(lein cljs-lambda deploy $1 :publish :quiet 2>/dev/null | tail -n 1); then
        if [[ -z $FN_VERSION ]]; then
            echo "Can't get function version"
            return 1
        fi
        if [ "$CI" != "true" ]; then
            echo "Skipping aliasing, not CI"
            return 0
        fi

        #
        # By default we don't need alias update, because every published version is aliased
        # with travis build number. But under some circumstances (build restart, ...), build
        # number can be same. Thus we try to update first then create.
        #
        echo "Updating alias $1:$2 with version $FN_VERSION"
        aws lambda update-alias --function-name $1 --name $2 --function-version $FN_VERSION
        if [ $? -eq 0 ]; then
            return 0
        fi
        echo "Creating alias $2:$3 -> $2:$FN_VERSION"
        aws lambda create-alias --function-name $1 --name $2 --function-version $FN_VERSION
        if [ $? -eq 0 ]; then
            return 0
        fi
        echo "Failed to create alias"
        return 1
    fi
    return 1
}

if [ -z "$1" ]; then
    echo "Usage: $0 list-of-functions-to-deploy.txt"
    exit 1
fi

if [ ! -f "$1" ]; then
    echo "File not found: $1"
    exit 1
fi

LAMBDA_ALIAS="build-$TRAVIS_BUILD_NUMBER"
NAMES="$(< "$1")"
for FUNC in $NAMES; do
    deploy $FUNC $LAMBDA_ALIAS || exit 1
done