Struct MessageView 

pub struct MessageView<'a> { /* private fields */ }

Read-only, zero-copy view over a single content part.

Provides a uniform interface for policy evaluation regardless of content type. Properties are computed on-demand by borrowing the underlying content part and extensions.

Produced by Message::iter_views() or the standalone iter_views().

Implementations

impl<'a> MessageView<'a>

pub fn new( part: &'a ContentPart, role: Role, hook: Option<&'a str>, extensions: Option<&'a Extensions>, ) -> Self

Create a new view over a content part.

pub fn kind(&self) -> ViewKind

The kind of content this view represents.

pub fn role(&self) -> Role

The role of the parent message.

pub fn raw(&self) -> &'a ContentPart

The underlying content part.

pub fn hook(&self) -> Option<&str>

The hook location, if set.

pub fn action(&self) -> ViewAction

The action this content represents.

pub fn is_pre(&self) -> bool

Whether this is a pre-execution hook (tool_pre_invoke, prompt_pre_fetch, etc.).

pub fn is_post(&self) -> bool

Whether this is a post-execution hook.

pub fn content(&self) -> Option<&str>

Text content (for text, thinking, tool result content).

pub fn name(&self) -> Option<&str>

Entity name (tool name, resource URI, prompt name).

pub fn uri(&self) -> Option<String>

URI for the entity.

pub fn args(&self) -> Option<&HashMap<String, Value>>

Arguments (for tool calls and prompt requests).

pub fn get_arg(&self, name: &str) -> Option<&Value>

Get a specific argument by name.

pub fn has_arg(&self, name: &str) -> bool

Whether this content has arguments.

pub fn mime_type(&self) -> Option<&str>

MIME type (for resources, media).

pub fn is_error(&self) -> bool

Whether the result is an error (tool results, prompt results).

pub fn is_tool(&self) -> bool

pub fn is_resource(&self) -> bool

pub fn is_prompt(&self) -> bool

pub fn is_media(&self) -> bool

pub fn is_text(&self) -> bool

pub fn extensions(&self) -> Option<&'a Extensions>

Get the extensions, if provided.

pub fn has_label(&self, label: &str) -> bool

Check if a security label exists.

pub fn get_header(&self, name: &str) -> Option<&str>

Get an HTTP header value.

pub fn to_dict(&self, include_content: bool, include_context: bool) -> Value

Serialize the view to a JSON-compatible map.

Includes the view’s properties, arguments, and optionally text content and extension context. Sensitive headers (Authorization, Cookie, X-API-Key) are stripped.

pub fn to_opa_input(&self, include_content: bool) -> Value

Serialize to OPA-compatible input format.

Wraps the view in the standard OPA input envelope: {"input": {...view data...}}.

Trait Implementations

impl<'a> Debug for MessageView<'a>

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

Formats the value using the given formatter.