Struct CreateContextParams 

pub struct CreateContextParams {

    pub service_directory: Option<ClientEnd<DirectoryMarker>>,
    pub data_directory: Option<ClientEnd<DirectoryMarker>>,
    pub user_agent_product: Option<String>,
    pub user_agent_version: Option<String>,
    pub remote_debugging_port: Option<u16>,
    pub content_directories: Option<Vec<ContentDirectoryProvider>>,
    pub features: Option<ContextFeatureFlags>,
    pub playready_key_system: Option<String>,
    pub unsafely_treat_insecure_origins_as_secure: Option<Vec<String>>,
    pub cors_exempt_headers: Option<Vec<Vec<u8>>>,
    pub cdm_data_directory: Option<ClientEnd<DirectoryMarker>>,
    pub cdm_data_quota_bytes: Option<u64>,
    pub data_quota_bytes: Option<u64>,
    /* private fields */
}

Parameters specifying the configuration for a new [Context].

Fields

service_directory: Option<ClientEnd<DirectoryMarker>>

Service directory to be used by the context.

The following services must be present in the service directory:

• [fuchsia.buildinfo/Provider]
• [fuchsia.device/NameProvider]
• [fuchsia.fonts/Provider]
• [fuchsia.hwinfo.Product]
• [fuchsia.intl/PropertyProvider]
• [fuchsia.kernel/VmexResource] (unless [ContextFeatureFlags.DISABLE_DYNAMIC_CODE_GENERATION] is set)
• [fuchsia.logger/LogSink]
• [fuchsia.memorypressure/Provider]
• [fuchsia.process/Launcher]
• [fuchsia.sysmem/Allocator]

The following services are recommended to be present in order to allow CPU scheduling profiles to be applied to threads to tune their performance, especially for media rendering.

• [fuchsia.media.ProfileProvider] (requirement will be removed in 2025)
• [fuchsia.scheduler.RoleManager]

The following services must be present in order to render web content in a Scenic view using [Frame.CreateView], [Frame.CreateViewWithViewRef] or [Frame.CreateView2]]:

• [fuchsia.accessibility.semantics/SemanticsManager]
• [fuchsia.ui.composition/Allocator]
• [fuchsia.ui.composition/Flatland]
• [fuchsia.ui.scenic/Scenic]

The following service must be present in order to collect diagnostic tracing data.

• [fuchsia.tracing.perfetto.ProducerConnector]

data_directory: Option<ClientEnd<DirectoryMarker>>

Handle to the directory that will contain the [Context]’s persistent data. If it is left unset, then the created [Context] will be stateless, with all of its data discarded upon [Context] destruction.

If set, data_directory must not be shared with any other [Context].

user_agent_product: Option<String>

Optional string describing the embedding product to append to the User-Agent string. See the specification for the HTTP User-Agent header. Requires that user_agent_version is also specified.

user_agent_version: Option<String>

Optional version for the embedding product to append to the User-Agent string.

Requires that user_agent_product is also specified.

remote_debugging_port: Option<u16>

Enables Frames to be created with remote debugging enabled using the DevTools protocol. If port is 0, then an ephemeral port will be used, which can be queried via the [Context.GetRemoteDebuggingPort] API.

Because remote debugging uses TCP, it is not valid to set a remote debugging port without having also set [ContextFeatureFlags.NETWORK] for the context.

content_directories: Option<Vec<ContentDirectoryProvider>>

List of providers whose contents will be served by fuchsia-dir:// URLs.

features: Option<ContextFeatureFlags>

Optional features that should be enabled for this context. Some features may also require additional services in service_directory.

playready_key_system: Option<String>

Enables PlayReady CDM for the Context using the specified string as a key system string. The string should be a reverse domain name, as required by EME API.

• Requires [fuchsia.media.drm/PlayReady] service.
• Requires that a cdm_data_directory be specified in CreateContextParams.

unsafely_treat_insecure_origins_as_secure: Option<Vec<String>>

Treat given insecure origins as secure origins. For the definition of secure contexts, see Secure Contexts and origin trustworthiness.

Example value: {"http://a.com", "http://b.com"}.

cors_exempt_headers: Option<Vec<Vec<u8>>>

Specifies a set of header names for which Cross-Origin Resource Sharing (CORS) checks should not be enforced.

cdm_data_directory: Option<ClientEnd<DirectoryMarker>>

Specifies the storage to use to persistent content licensing related data (e.g. provisioning data, persistent session data). By default these data will be placed under the data_directory, if specified.

If neither data_directory nor cdm_data_directory are specified, then content licensing features requiring persistent storage (e.g. persistent licensing sessions) will not be available to the [Context].

Note that not all content licensing systems support persistent sessions, regardless of whether persistent storage is provided.

cdm_data_quota_bytes: Option<u64>

Specifies a target maximum size for cdm_data_directory contents, in bytes. If the amount of persisted CDM data exceeds this threshold, then the [Context] will attempt to purge some data to meet the specified quota.

data_quota_bytes: Option<u64>

Specifies a target maximum size for data_directory contents, in bytes. The [Context] will attempt to limit browsing state (e.g. cookies, LocalStorage) to not exceed the specified size.

Trait Implementations

impl Debug for CreateContextParams

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Decode<CreateContextParams, DefaultFuchsiaResourceDialect> for CreateContextParams

fn new_empty() -> Self

Creates a valid instance of Self. The specific value does not matter, since it will be overwritten by decode.

unsafe fn decode( &mut self, decoder: &mut Decoder<'_, DefaultFuchsiaResourceDialect>, offset: usize, depth: Depth, ) -> Result<()>

Decodes an object of type T from the decoder’s buffers into self.

impl Default for CreateContextParams

fn default() -> CreateContextParams

Returns the “default value” for a type.

impl Encode<CreateContextParams, DefaultFuchsiaResourceDialect> for &mut CreateContextParams

unsafe fn encode( self, encoder: &mut Encoder<'_, DefaultFuchsiaResourceDialect>, offset: usize, depth: Depth, ) -> Result<()>

Encodes the object into the encoder’s buffers. Any handles stored in the object are swapped for Handle::INVALID.

impl PartialEq for CreateContextParams

fn eq(&self, other: &CreateContextParams) -> bool

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl ResourceTypeMarker for CreateContextParams

type Borrowed<'a> = &'a mut CreateContextParams

The Rust type to use for encoding. This is a particular Encode<Self> type cheaply obtainable from &mut Self::Owned. There are three cases:

fn take_or_borrow<'a>( value: &'a mut <Self as TypeMarker>::Owned, ) -> Self::Borrowed<'a>

Cheaply converts from &mut Self::Owned to Self::Borrowed. For HandleBased types this is “take” (it returns an owned handle and replaces value with Handle::invalid), and for all other types it is “borrow” (just converts from one reference to another).

impl TypeMarker for CreateContextParams

type Owned = CreateContextParams

The owned Rust type which this FIDL type decodes into.

fn inline_align(_context: Context) -> usize

Returns the minimum required alignment of the inline portion of the encoded object. It must be a (nonzero) power of two.

fn inline_size(_context: Context) -> usize

Returns the size of the inline portion of the encoded object, including padding for alignment. Must be a multiple of inline_align.

fn encode_is_copy() -> bool

Returns true if the memory layout of Self::Owned matches the FIDL wire format and encoding requires no validation. When true, we can optimize encoding arrays and vectors of Self::Owned to a single memcpy.

fn decode_is_copy() -> bool

Returns true if the memory layout of Self::Owned matches the FIDL wire format and decoding requires no validation. When true, we can optimize decoding arrays and vectors of Self::Owned to a single memcpy.

impl Standalone<DefaultFuchsiaResourceDialect> for CreateContextParams

impl StructuralPartialEq for CreateContextParams