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//! Generic flattener state for arbitrary Bloomberg responses.
//!
//! Flattens any Bloomberg response into a normalized table with columns:
//! - path: Element path (e.g., "securityData[0].fieldData.PX_LAST")
//! - type: Value type (string, number, boolean, null, array, object)
//! - value_str: String representation of value
//! - value_num: Numeric value (if applicable)
//!
//! Extracts directly from Bloomberg Elements without JSON intermediate.
use std::sync::Arc;
use arrow_array::builder::{Float64Builder, StringBuilder};
use arrow_array::RecordBatch;
use arrow_schema::{DataType as ArrowDataType, Field, Schema};
use tokio::sync::oneshot;
use super::value_utils::{format_date32, format_timestamp_micros, top_level_response_error};
use xbbg_core::{BlpError, DataType, Element, Message, Value};
/// State for a generic request that flattens elements to tabular format.
pub struct GenericState {
/// Element path builder
path_builder: StringBuilder,
/// Value type builder
type_builder: StringBuilder,
/// String value builder
value_str_builder: StringBuilder,
/// Numeric value builder
value_num_builder: Float64Builder,
/// Reply channel
pub reply: oneshot::Sender<Result<RecordBatch, BlpError>>,
}
impl GenericState {
/// Create a new generic state.
pub fn new(reply: oneshot::Sender<Result<RecordBatch, BlpError>>) -> Self {
Self {
path_builder: StringBuilder::new(),
type_builder: StringBuilder::new(),
value_str_builder: StringBuilder::new(),
value_num_builder: Float64Builder::new(),
reply,
}
}
/// Process a PARTIAL_RESPONSE message.
pub fn on_partial(&mut self, msg: &Message) {
self.process_message(msg);
}
/// Process the final RESPONSE message and send the result via reply channel.
pub fn finish(mut self, msg: &Message) {
if let Some(error) = top_level_response_error(msg, "<generic>", "GenericRequest") {
let _ = self.reply.send(Err(error));
return;
}
self.process_message(msg);
let result = self.build_batch();
if let Ok(ref batch) = result {
xbbg_log::debug!(
rows = batch.num_rows(),
cols = batch.num_columns(),
"generic finish"
);
}
let _ = self.reply.send(result);
}
/// Process a message by flattening its elements to rows.
fn process_message(&mut self, msg: &Message) {
let root = msg.elements();
self.flatten_element("", &root);
}
/// Recursively flatten an element into rows.
fn flatten_element(&mut self, path: &str, elem: &Element<'_>) {
match elem.datatype() {
DataType::Sequence => {
// Check if this sequence is an array (iterate by index)
// vs a struct with named children (iterate by children)
if elem.is_array() {
// Array of elements - iterate by index using len()
let n = elem.len();
for i in 0..n {
if let Some(item) = elem.get_element(i) {
let item_path = format!("{}[{}]", path, i);
self.flatten_element(&item_path, &item);
}
}
} else {
// Sequence with named children - iterate over children
for child in elem.children() {
let child_name = child.name_str();
let child_path = if path.is_empty() {
child_name.to_string()
} else {
format!("{}.{}", path, child_name)
};
self.flatten_element(&child_path, &child);
}
}
}
DataType::Choice => {
// Choice - single selected child
for child in elem.children() {
let child_name = child.name_str();
let child_path = if path.is_empty() {
child_name.to_string()
} else {
format!("{}.{}", path, child_name)
};
self.flatten_element(&child_path, &child);
}
}
_ => {
// Leaf value - extract and record
if elem.is_null() {
self.append_row(path, "null", None, None);
return;
}
// Try to get the value at index 0
if let Some(value) = elem.get_value(0) {
match value {
Value::Null => {
self.append_row(path, "null", None, None);
}
Value::Bool(b) => {
self.append_row(path, "boolean", Some(&b.to_string()), None);
}
Value::Int32(i) => {
self.append_row(path, "number", Some(&i.to_string()), Some(i as f64));
}
Value::Int64(i) => {
self.append_row(path, "number", Some(&i.to_string()), Some(i as f64));
}
Value::Float64(f) => {
self.append_row(path, "number", Some(&f.to_string()), Some(f));
}
Value::String(s) => {
self.append_row(path, "string", Some(s), None);
}
Value::Enum(s) => {
self.append_row(path, "string", Some(s), None);
}
Value::Date32(days) => {
let date_str = format_date32(days);
self.append_row(path, "date", Some(&date_str), Some(days as f64));
}
Value::TimestampMicros(micros) => {
let dt_str = format_timestamp_micros(micros);
self.append_row(path, "datetime", Some(&dt_str), Some(micros as f64));
}
Value::Datetime(dt) => {
let micros = dt.to_micros();
let dt_str = format_timestamp_micros(micros);
self.append_row(path, "datetime", Some(&dt_str), Some(micros as f64));
}
Value::Byte(b) => {
self.append_row(path, "number", Some(&b.to_string()), Some(b as f64));
}
Value::Time64Micros(micros) => {
let t = micros / 1_000_000;
let time_str =
format!("{:02}:{:02}:{:02}", t / 3600, (t % 3600) / 60, t % 60);
self.append_row(path, "time", Some(&time_str), Some(micros as f64));
}
}
} else {
// Could not extract value
self.append_row(path, "null", None, None);
}
}
}
}
/// Append a single row to the builders.
fn append_row(
&mut self,
path: &str,
value_type: &str,
value_str: Option<&str>,
value_num: Option<f64>,
) {
self.path_builder.append_value(path);
self.type_builder.append_value(value_type);
match value_str {
Some(s) => self.value_str_builder.append_value(s),
None => self.value_str_builder.append_null(),
}
match value_num {
Some(n) => self.value_num_builder.append_value(n),
None => self.value_num_builder.append_null(),
}
}
/// Build the final RecordBatch.
fn build_batch(&mut self) -> Result<RecordBatch, BlpError> {
let path_array = self.path_builder.finish();
let type_array = self.type_builder.finish();
let value_str_array = self.value_str_builder.finish();
let value_num_array = self.value_num_builder.finish();
let schema = Arc::new(Schema::new(vec![
Field::new("path", ArrowDataType::Utf8, false),
Field::new("type", ArrowDataType::Utf8, false),
Field::new("value_str", ArrowDataType::Utf8, true),
Field::new("value_num", ArrowDataType::Float64, true),
]));
RecordBatch::try_new(
schema,
vec![
Arc::new(path_array),
Arc::new(type_array),
Arc::new(value_str_array),
Arc::new(value_num_array),
],
)
.map_err(|e| BlpError::Internal {
detail: format!("build RecordBatch: {e}"),
})
}
}