我在节点的特定值更新时编写了Firebase云函数，然后需要触发它。firebase结构和代码如下。我为此使用javascript firebase cli。在firebase控制台中，它不断抛出import AVFoundation
import AudioToolbox
import Foundation
import QuartzCore
import Security
import WebKit
import Cocoa
import Metal
import MetalKit
import Swift
let device = MTLCreateSystemDefaultDevice()!
// Our clear color, can be set to any color
let clearColor = MTLClearColor(red: 0.1, green: 0.57, blue: 0.25, alpha: 1)
let nsapp = NSApplication.shared
let appName = ProcessInfo.processInfo.processName
let window = NSWindow(
contentRect: NSMakeRect(0, 0, 1000, 1000),
styleMask: .fullSizeContentView,
backing: NSWindow.BackingStoreType.buffered,
defer: false
)
window.cascadeTopLeft(from:NSMakePoint(20,20))
window.title = appName;
window.makeKeyAndOrderFront(nil)
struct Vertex {
var position: float3
var color: float4
}
let view = MTKView(frame: NSRect(origin: CGPoint.zero, size: window.frame.size), device: device)
window.contentView = view
view.device = device
view.colorPixelFormat = .bgra8Unorm
view.clearColor = clearColor
let queue = device.makeCommandQueue()!
var vertexBuffer: MTLBuffer!
var vertices: [Vertex] = [
Vertex(position: float3(0,1,0), color: float4(1,0,0,1)),
Vertex(position: float3(-1,-1,0), color: float4(0,1,0,1)),
Vertex(position: float3(1,-1,0), color: float4(0,0,1,1))
]
let shaders = """
#include <metal_stdlib>
using namespace metal;
// Basic Struct to match our Swift type
// This is what is passed into the Vertex Shader
struct VertexIn {
float3 position;
float4 color;
};
// What is returned by the Vertex Shader
// This is what is passed into the Fragment Shader
struct VertexOut {
float4 position [[ position ]];
float4 color;
};
vertex VertexOut basic_vertex_function(const device VertexIn *vertices [[ buffer(0) ]],
uint vertexID [[ vertex_id ]]) {
VertexOut vOut;
vOut.position = float4(vertices[vertexID].position,1);
vOut.color = vertices[vertexID].color;
return vOut;
}
fragment float4 basic_fragment_function(VertexOut vIn [[ stage_in ]]) {
return vIn.color;
}
"""
let library = try device.makeLibrary(source: shaders, options: nil)
let pipelineDescriptor = MTLRenderPipelineDescriptor()
pipelineDescriptor.colorAttachments[0].pixelFormat = .bgra8Unorm
pipelineDescriptor.vertexFunction = library.makeFunction(name: "basic_vertex_function")
pipelineDescriptor.fragmentFunction = library.makeFunction(name: "basic_fragment_function")
let pipelineState = try device.makeRenderPipelineState(descriptor: pipelineDescriptor)
vertexBuffer = device.makeBuffer(
bytes: vertices,
length: MemoryLayout<Vertex>.stride * vertices.count,
options: []
)
enum MetalErrors: Error {
case commandBuffer
case passDescriptor
case encoder
}
guard let drawable = view.currentDrawable else { throw MetalErrors.commandBuffer }
guard let commandBuffer = queue.makeCommandBuffer() else { throw MetalErrors.commandBuffer }
guard let passDescriptor = view.currentRenderPassDescriptor else { throw MetalErrors.passDescriptor }
guard let encoder = commandBuffer.makeRenderCommandEncoder(descriptor: passDescriptor) else { throw MetalErrors.encoder }
nsapp.run()
// let vertexData: [Float] = [ -0.5, -0.5, 0, 1, 0, 0,
// 0.5, -0.5, 0, 0, 1, 0,
// 0, 0.5, 0, 0, 0, 1 ]
encoder.setRenderPipelineState(pipelineState)
// encoder.setVertexBytes(vertexData, length: vertexData.count * MemoryLayout<Float>.stride, index: 0)
encoder.drawPrimitives(type: .triangle, vertexStart: 0, vertexCount: vertices.count)
encoder.endEncoding()
commandBuffer.present(drawable)
commandBuffer.commit()
< / p>
Function returned undefined, expected Promise or value答案 0 :(得分：1)
1 /您没有正确返回由once()异步方法返回的Promise。
2 /以下几行中也有错误：
console.log(evnt.after.val);
const sensData = evnt.after.val;
应该是：
console.log(evnt.after.val());
const sensData = evnt.after.val();
因为val()是一种方法
3 /最后，您应该考虑状态为<= 71的情况。
因此，您应该按照以下方式修改代码：
exports.pressureExceeding = functions.database.ref("Reservoir/{id}")
.onUpdate(evnt => {
console.log(evnt.after.val);
const sensData = evnt.after.val;
const status = sensData.sensor3;
console.log(evnt.after.val);
if (status > 71) {
const payLoad = {
notification: {
title: "Emergency Alert",
body: "{sensData.keys} Pressure is High",
badge: "1",
sound: "defualt" // <- Typo
}
};
//What happens if status <= 71?? You should manage this case, as you are using payload below.
return admin.database().ref("FcmToken").once("value"). // <- Here return the promise returned by the once() method, then you chain the promises
.then(allToken => {
if (allToken.val()) {
console.log("token available");
const token = Object.keys(allToken.val());
return admin.messaging().sendToDevice(token, payLoad);
} else {
console.log("no token available");
return null; // <- Here return a value
}
});
}
});
最后一句话：对于版本<1.0，您使用的是旧语法。您可能应该更新您的Cloud Function版本（并修改语法）。看看以下文档：https://firebase.google.com/docs/functions/beta-v1-diff