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const std = @import("std");
const conversation = @import("conversation.zig");
pub const ContentBlockType = enum {
Text,
Thinking,
ToolUse,
ToolResult,
};
pub const BlockMeta = struct {
/// Only populated for ToolUse blocks. Null for Text/Thinking.
tool_id: ?[]const u8 = null,
tool_name: ?[]const u8 = null,
};
/// Vtable for receiving streaming events from a Provider.
///
/// The lifecycle callbacks (`onMessageStart` ... `onMessageComplete`) return
/// `anyerror!void`. Returning an error aborts the in-flight turn: the Provider
/// stops streaming, calls `onError(err)`, and propagates `err` out of
/// `streamStep`. No partial assistant message is appended to the conversation.
///
/// `onError` is the receiver's cleanup hook. It fires exactly once per failed
/// turn, whether the error originated in the receiver itself (a write failure)
/// or in the Provider (HTTP/parse/stream failure). It is the last callback the
/// receiver will see for that turn. `onError` itself cannot fail; receivers
/// must swallow secondary failures during cleanup.
pub const ReceiverVTable = struct {
onMessageStart: *const fn (*anyopaque, conversation.MessageRole) anyerror!void,
onBlockStart: *const fn (*anyopaque, ContentBlockType, usize, ?BlockMeta) anyerror!void,
onContentDelta: *const fn (*anyopaque, usize, []const u8) anyerror!void,
onBlockComplete: *const fn (*anyopaque, usize, conversation.ContentBlock) anyerror!void,
onMessageComplete: *const fn (*anyopaque, conversation.Message) anyerror!void,
onError: *const fn (*anyopaque, anyerror) void,
};
pub const Receiver = struct {
ptr: *anyopaque,
vtable: *const ReceiverVTable,
pub fn onMessageStart(self: Receiver, role: conversation.MessageRole) !void {
try self.vtable.onMessageStart(self.ptr, role);
}
pub fn onBlockStart(self: Receiver, block_type: ContentBlockType, index: usize, meta: ?BlockMeta) !void {
try self.vtable.onBlockStart(self.ptr, block_type, index, meta);
}
pub fn onContentDelta(self: Receiver, block_index: usize, delta: []const u8) !void {
try self.vtable.onContentDelta(self.ptr, block_index, delta);
}
pub fn onBlockComplete(self: Receiver, block_index: usize, block: conversation.ContentBlock) !void {
try self.vtable.onBlockComplete(self.ptr, block_index, block);
}
pub fn onMessageComplete(self: Receiver, message: conversation.Message) !void {
try self.vtable.onMessageComplete(self.ptr, message);
}
pub fn onError(self: Receiver, err: anyerror) void {
self.vtable.onError(self.ptr, err);
}
};
pub const ProviderVTable = struct {
streamStep: *const fn (*anyopaque, *conversation.Conversation, *Receiver) anyerror!void,
deinit: *const fn (*anyopaque) void,
};
pub const Provider = struct {
ptr: *anyopaque,
vtable: *const ProviderVTable,
pub fn streamStep(self: Provider, conv: *conversation.Conversation, receiver: *Receiver) anyerror!void {
return self.vtable.streamStep(self.ptr, conv, receiver);
}
pub fn deinit(self: Provider) void {
self.vtable.deinit(self.ptr);
}
};
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