async checkExistingContainers()

in src/invoker.js [245:280]
26 lines of code
10 McCabe index (conditional complexity)

    async checkExistingContainers() {
        let containers = await this.docker.listContainers();
        const fullActionName = this.getFullActionName();

        // remove all left over containers with the same action name label
        for (const container of containers) {
            if (container.Labels[LABEL_ACTION_NAME] === fullActionName) {
                log.warn(`Removing container from a previous wskdebug run for this action (${dockerUtils.getContainerName(container)}).`)
                const oldContainer = await this.docker.getContainer(container.Id);
                await oldContainer.remove({force: true});
            }
        }

        // check if the debug port is already in use
        if (await isPortReachable(this.debug.port)) {
            containers = await this.docker.listContainers();
            // then check if it's another container with that port
            for (const container of containers) {
                for (const port of container.Ports) {
                    if (port.PublicPort === this.debug.port) {
                        // check if wskdebug container by looking at our label
                        if (container.Labels[LABEL_ACTION_NAME]) {
                            // wskdebug of different action
                            throw new Error(`Debug port ${this.debug.port} already in use by wskdebug for action ${container.Labels[LABEL_ACTION_NAME]}, cotainer ${dockerUtils.getContainerName(container)} (id: ${container.Id}).`);
                        } else {
                            // some non-wskdebug container
                            throw new Error(`Debug port ${this.debug.port} already in use by another docker container ${dockerUtils.getContainerName(container)} (id: ${container.Id}).`);
                        }
                    }
                }
            }

            // some other process uses the port
            throw new Error(`Debug port ${this.debug.port} already in use.`);
        }
    }