functions.sh

#!/usr/bin/env bash

function reload_nginx {
    local _nginx_proxy_container=${NGINX_PROXY_CONTAINER:-}
    if [[ -n "${_nginx_proxy_container:-}" ]]; then
        echo "Reloading nginx proxy (${_nginx_proxy_container})..."
        docker_exec "${_nginx_proxy_container}" \
            '[ "sh", "-c", "/app/docker-entrypoint.sh /usr/local/bin/docker-gen /app/nginx.tmpl /etc/nginx/conf.d/default.conf; /usr/sbin/nginx -s reload" ]' \
            | sed -rn 's/^.*([0-9]{4}\/[0-9]{2}\/[0-9]{2}.*$)/\1/p'
        [[ ${PIPESTATUS[0]} -eq 1 ]] && echo "$(date "+%Y/%m/%d %T"), Error: can't reload nginx-proxy." >&2
    fi
}

## Docker API
function docker_api {
    local scheme
    local curl_opts=(-s)
    local method=${2:-GET}
    # data to POST
    if [[ -n "${3:-}" ]]; then
        curl_opts+=(-d "$3")
    fi
    if [[ -z "$DOCKER_HOST" ]];then
        echo "Error DOCKER_HOST variable not set" >&2
        return 1
    fi
    if [[ $DOCKER_HOST == unix://* ]]; then
        curl_opts+=(--unix-socket ${DOCKER_HOST#unix://})
        scheme='http://localhost'
    else
        scheme="http://${DOCKER_HOST#*://}"
    fi
    [[ $method = "POST" ]] && curl_opts+=(-H 'Content-Type: application/json')
    curl "${curl_opts[@]}" -X${method} ${scheme}$1
}

function docker_exec {
    local id="${1?missing id}"
    local cmd="${2?missing command}"
    local data=$(printf '{ "AttachStdin": false, "AttachStdout": true, "AttachStderr": true, "Tty":false,"Cmd": %s }' "$cmd")
    exec_id=$(docker_api "/containers/$id/exec" "POST" "$data" | jq -r .Id)
    if [[ -n "$exec_id" && "$exec_id" != "null" ]]; then
        docker_api /exec/$exec_id/start "POST" '{"Detach": false, "Tty":false}'
    else
        echo "$(date "+%Y/%m/%d %T"), Error: can't exec command ${cmd} in container ${id}. Check if the container is running." >&2
        return 1
    fi
}