INTO-CPS-Association/DTaaS

sequenceDiagram
    actor Client
    actor Traefik

    box LightGreen Library Microservice
    participant FR as FilesResolver
    participant FSF as FilesServiceFactory
    participant CS as ConfigService
    participant IFS as IFilesService
    participant LFS as LocalFilesService
    end

    participant FS as Local File System DB

    Client ->> Traefik : HTTP request
    Traefik ->> FR : GraphQL query
    activate FR

    FR ->> FSF : create()
    activate FSF

    FSF ->> CS : getConfiguration("MODE")
    activate CS

    CS -->> FSF : return configuration value
    deactivate CS

    alt MODE = Local
    FSF ->> FR : return filesService (LFS)
    deactivate FSF

    FR ->> IFS : listDirectory(path) or readFile(path)
    activate IFS

    IFS ->> LFS : listDirectory(path) or readFile(path)
    activate LFS

    LFS ->> CS : getConfiguration("LOCAL_PATH")
    activate CS

    CS -->> LFS : return local path
    deactivate CS

    LFS ->> FS : Access filesystem
    alt Filesystem error
        FS -->> LFS : Filesystem error
        LFS ->> LFS : Throw new InternalServerErrorException
        LFS -->> IFS : Error
    else Successful file operation
        FS -->> LFS : Return filesystem data
        LFS ->> IFS : return Promise<Project>
    end
    deactivate LFS
    activate IFS
    end

    alt Error thrown
    IFS ->> FR : return Error
    deactivate IFS
    FR ->> Traefik : return Error
    Traefik ->> Client : HTTP error response
    else Successful operation
    IFS ->> FR : return Promise<Project>
    deactivate IFS
    FR ->> Traefik : return Promise<Project>
    Traefik ->> Client : HTTP response
    end

    deactivate FR