docdb/internal/handler/msg_aggregate.go

// Copyright 2021 Hanzo AI Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

package handler

import (
	"context"

	"github.com/AlekSi/lazyerrors"

	"github.com/hanzoai/docdb/internal/handler/middleware"
)

// msgAggregate implements `aggregate` command.
//
// The passed context is canceled when the client connection is closed.
func (h *Handler) msgAggregate(connCtx context.Context, req *middleware.Request) (*middleware.Response, error) {
	doc := req.Document()

	userID, sessionID, err := h.s.CreateOrUpdateByLSID(connCtx, doc)
	if err != nil {
		return nil, err
	}

	dbName, err := getRequiredParam[string](doc, "$db")
	if err != nil {
		return nil, err
	}

	page, cursorID, err := h.p.Aggregate(connCtx, dbName, req.DocumentRaw())
	if err != nil {
		return nil, lazyerrors.Error(err)
	}

	h.s.AddCursor(connCtx, userID, sessionID, cursorID)

	return middleware.ResponseDoc(req, page)
}