fn build()

in core/src/services/azdfs/backend.rs [152:208]
49 lines of code
3 McCabe index (conditional complexity)

    fn build(&mut self) -> Result<Self::Accessor> {
        debug!("backend build started: {:?}", &self);

        let root = normalize_root(&self.root.take().unwrap_or_default());
        debug!("backend use root {}", root);

        // Handle endpoint, region and container name.
        let filesystem = match self.filesystem.is_empty() {
            false => Ok(&self.filesystem),
            true => Err(Error::new(ErrorKind::ConfigInvalid, "filesystem is empty")
                .with_operation("Builder::build")
                .with_context("service", Scheme::Azdfs)),
        }?;
        debug!("backend use filesystem {}", &filesystem);

        let endpoint = match &self.endpoint {
            Some(endpoint) => Ok(endpoint.clone()),
            None => Err(Error::new(ErrorKind::ConfigInvalid, "endpoint is empty")
                .with_operation("Builder::build")
                .with_context("service", Scheme::Azdfs)),
        }?;
        debug!("backend use endpoint {}", &filesystem);

        let client = if let Some(client) = self.http_client.take() {
            client
        } else {
            HttpClient::new().map_err(|err| {
                err.with_operation("Builder::build")
                    .with_context("service", Scheme::Azdfs)
            })?
        };

        let config_loader = AzureStorageConfig {
            account_name: self
                .account_name
                .clone()
                .or_else(|| infer_storage_name_from_endpoint(endpoint.as_str())),
            account_key: self.account_key.clone(),
            sas_token: None,
            ..Default::default()
        };

        let cred_loader = AzureStorageLoader::new(config_loader);
        let signer = AzureStorageSigner::new();

        debug!("backend build finished: {:?}", &self);
        Ok(AzdfsBackend {
            core: Arc::new(AzdfsCore {
                filesystem: self.filesystem.clone(),
                root,
                endpoint,
                client,
                loader: cred_loader,
                signer,
            }),
        })
    }