Scripts: create server script for pmtiles

scripts/pmTilesExtractGenerator.ts

@@ -0,0 +1,64 @@
+import { spawn } from "child_process"
+import { Tiles } from "../src/Models/TileRange"
+
+export class PmTilesExtractGenerator {
+    private readonly _targetDir: string
+    private readonly _sourceFile: string
+    private readonly _executeableLocation: string
+
+    constructor(sourceFile: string, targetDir: string, executeableLocation: string = "/data/pmtiles") {
+        this._sourceFile = sourceFile
+        this._targetDir = targetDir
+        this._executeableLocation = executeableLocation
+    }
+
+    startProcess(script: string, captureStdioChunks?: (string: string) => void): Promise<void> {
+        return new Promise((resolve, reject) => {
+            const child = spawn(this._executeableLocation, script.split(" "), {
+                stdio: captureStdioChunks === undefined ? "ignore" : ["pipe", "pipe", "pipe"],
+                cwd: this._targetDir,
+            })
+
+            if (captureStdioChunks !== undefined) {
+                child.stdout.on("data", data => {
+                    captureStdioChunks(data)
+                })
+            }
+
+            /*child.stderr.on('data', data => {
+                console.error(`stderr: ${data}`);
+            });*/
+
+            child.on("close", (code) => {
+                if (code === 0) resolve()
+                else reject(new Error(`Process exited with code ${code}`))
+            })
+
+            child.on("error", reject)
+        })
+    }
+
+    getFilename(z: number, x: number, y: number) {
+        return `${this._targetDir}/${z}/${x}/${y}.pmtiles`
+    }
+
+    async generateArchive(z: number, x: number, y: number, maxzoom?: number): Promise<string> {
+        const [[max_lat, min_lon], [min_lat, max_lon]] = Tiles.tile_bounds(z, x, y)
+        let maxzoomflag = ""
+        if (maxzoom !== undefined) {
+            maxzoomflag = " --maxzoom=" + maxzoom
+        }
+        const outputFileName = this.getFilename(z, x, y)
+        await this.startProcess(
+            `extract ${this._sourceFile} --download-threads=1 --minzoom=${z}${maxzoomflag} --bbox=${[
+                min_lon,
+                min_lat + 0.0001,
+                max_lon,
+                max_lat,
+            ].join(",")} ${outputFileName}`,
+        )
+        return outputFileName
+    }
+
+
+}