libraries/flicker/utils/src/android/tools/device/traces/parsers/perfetto/TraceProcessorSession.kt

/*
 * Copyright (C) 2023 The Android Open Source Project
 *
 * 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.
 */

@file:OptIn(
    androidx.benchmark.perfetto.ExperimentalPerfettoCaptureApi::class,
    androidx.benchmark.perfetto.ExperimentalPerfettoTraceProcessorApi::class
)

package android.tools.device.traces.parsers.perfetto

import android.tools.common.io.TraceType
import androidx.benchmark.perfetto.PerfettoTrace
import androidx.benchmark.perfetto.PerfettoTraceProcessor
import java.io.File
import java.io.FileOutputStream

typealias Row = Map<String, Any?>

class TraceProcessorSession {
    val session: PerfettoTraceProcessor.Session

    constructor(session: PerfettoTraceProcessor.Session) {
        this.session = session
    }

    fun <T> query(sql: String, predicate: (List<Row>) -> T): T {
        val rows = session.query(sql)
        return predicate(rows.toList())
    }

    companion object {
        fun <T> loadPerfettoTrace(trace: ByteArray, predicate: (TraceProcessorSession) -> T): T {
            val traceFile = File.createTempFile(TraceType.SF.fileName, "")
            FileOutputStream(traceFile).use { it.write(trace) }
            val result =
                PerfettoTraceProcessor.runServer {
                    loadTrace(PerfettoTrace(traceFile.absolutePath)) {
                        predicate(TraceProcessorSession(this))
                    }
                }
            return result
        }
    }
}