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feat: add template variable rendering for transfer call destination

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This commit is contained in:
Abhishek Kumar 2026-07-02 13:35:25 +05:30
parent 65d46bc313
commit 9966940624
8 changed files with 279 additions and 142 deletions
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91
api/services/workflow/pipecat_engine_custom_tools.py
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@ -7,7 +7,6 @@ during workflow execution.
from __future__ import annotations
import asyncio
import re
import time
import uuid
from typing import TYPE_CHECKING, Any, Dict, List, Optional
@ -32,12 +31,32 @@ from api.services.workflow.tools.custom_tool import (
execute_http_tool,
tool_to_function_schema,
)
from api.utils.template_renderer import render_template
if TYPE_CHECKING:
from api.services.workflow.mcp_tool_session import McpToolSession
from api.services.workflow.pipecat_engine import PipecatEngine
def _render_transfer_destination(
destination_template: Any,
call_context_vars: Optional[Dict[str, Any]],
gathered_context_vars: Optional[Dict[str, Any]],
) -> str:
"""Resolve a transfer destination template into a concrete provider target."""
initial_context = dict(call_context_vars or {})
render_context: Dict[str, Any] = {
**initial_context,
"initial_context": initial_context,
"gathered_context": dict(gathered_context_vars or {}),
}
rendered = render_template(destination_template, render_context)
if rendered is None:
return ""
return str(rendered).strip()
def get_function_schema(
function_name: str,
description: str,
@ -541,6 +560,12 @@ class CustomToolManager:
)
return
destination = _render_transfer_destination(
destination,
self._engine._call_context_vars,
self._engine._gathered_context,
)
# Validate destination phone number
if not destination or not destination.strip():
validation_error_result = {
@ -554,41 +579,6 @@ class CustomToolManager:
)
return
# Validate destination format based on workflow run mode
if workflow_run.mode == WorkflowRunMode.ARI.value:
# For ARI provider, also accept SIP endpoints
SIP_ENDPOINT_REGEX = r"^(PJSIP|SIP)\/[\w\-\.@]+$"
E164_PHONE_REGEX = r"^\+[1-9]\d{1,14}$"
is_valid_sip = re.match(SIP_ENDPOINT_REGEX, destination)
is_valid_e164 = re.match(E164_PHONE_REGEX, destination)
if not (is_valid_sip or is_valid_e164):
validation_error_result = {
"status": "failed",
"message": "I'm sorry, but the transfer destination appears to be invalid. Please contact support to verify the transfer settings.",
"action": "transfer_failed",
"reason": "invalid_destination",
}
await self._handle_transfer_result(
validation_error_result, function_call_params, properties
)
return
else:
# For non-ARI providers (Twilio, etc), use E.164 validation
E164_PHONE_REGEX = r"^\+[1-9]\d{1,14}$"
if not re.match(E164_PHONE_REGEX, destination):
validation_error_result = {
"status": "failed",
"message": "I'm sorry, but the transfer phone number appears to be invalid. Please contact support to verify the transfer settings.",
"action": "transfer_failed",
"reason": "invalid_destination",
}
await self._handle_transfer_result(
validation_error_result, function_call_params, properties
)
return
played = await self._play_config_message(config)
if played:
self._engine._queued_speech_mute_state = "waiting"
@ -648,12 +638,27 @@ class CustomToolManager:
self._engine.set_mute_pipeline(True)
# Initiate transfer via provider with inline TwiML
transfer_result = await provider.transfer_call(
destination=destination,
transfer_id=transfer_id,
conference_name=conference_name,
timeout=timeout_seconds,
)
try:
transfer_result = await provider.transfer_call(
destination=destination,
transfer_id=transfer_id,
conference_name=conference_name,
timeout=timeout_seconds,
)
except Exception as e:
logger.error(f"Transfer provider failed: {e}")
self._engine.set_mute_pipeline(False)
await call_transfer_manager.remove_transfer_context(transfer_id)
provider_error_result = {
"status": "failed",
"message": f"Transfer provider failed: {e}",
"action": "transfer_failed",
"reason": "provider_error",
}
await self._handle_transfer_result(
provider_error_result, function_call_params, properties
)
return
call_sid = transfer_result.get("call_sid")
logger.info(f"Transfer call initiated successfully: {call_sid}")
@ -809,7 +814,7 @@ class CustomToolManager:
{
"status": "transfer_failed",
"reason": reason,
"message": "Transfer failed",
"message": result.get("message") or "Transfer failed",
}
)
else: