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index.js
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index.js
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if (process.env.NODE_ENV !== 'production') {
require('dotenv').load();
}
const path = require('path');
const storage = require('azure-storage');
const blobService = storage.createBlobService();
const listContainers = async () => {
return new Promise((resolve, reject) => {
blobService.listContainersSegmented(null, (err, data) => {
if (err) {
reject(err);
} else {
resolve({ message: `${data.entries.length} containers`, containers: data.entries });
}
});
});
};
const createContainer = async (containerName) => {
return new Promise((resolve, reject) => {
blobService.createContainerIfNotExists(containerName, { publicAccessLevel: 'blob' }, err => {
if (err) {
reject(err);
} else {
resolve({ message: `Container '${containerName}' created` });
}
});
});
};
const uploadString = async (containerName, blobName, text) => {
return new Promise((resolve, reject) => {
blobService.createBlockBlobFromText(containerName, blobName, text, err => {
if (err) {
reject(err);
} else {
resolve({ message: `Text "${text}" is written to blob storage` });
}
});
});
};
const uploadLocalFile = async (containerName, filePath) => {
return new Promise((resolve, reject) => {
const fullPath = path.resolve(filePath);
const blobName = path.basename(filePath);
blobService.createBlockBlobFromLocalFile(containerName, blobName, fullPath, err => {
if (err) {
reject(err);
} else {
resolve({ message: `Local file "${filePath}" is uploaded` });
}
});
});
};
const listBlobs = async (containerName) => {
return new Promise((resolve, reject) => {
blobService.listBlobsSegmented(containerName, null, (err, data) => {
if (err) {
reject(err);
} else {
resolve({ message: `${data.entries.length} blobs in '${containerName}'`, blobs: data.entries });
}
});
});
};
const downloadBlob = async (containerName, blobName) => {
const dowloadFilePath = path.resolve('./' + blobName.replace('.txt', '.downloaded.txt'));
return new Promise((resolve, reject) => {
blobService.getBlobToText(containerName, blobName, (err, data) => {
if (err) {
reject(err);
} else {
resolve({ message: `Blob downloaded "${data}"`, text: data });
}
});
});
};
const deleteBlob = async (containerName, blobName) => {
return new Promise((resolve, reject) => {
blobService.deleteBlobIfExists(containerName, blobName, err => {
if (err) {
reject(err);
} else {
resolve({ message: `Block blob '${blobName}' deleted` });
}
});
});
};
const deleteContainer = async (containerName) => {
return new Promise((resolve, reject) => {
blobService.deleteContainer(containerName, err => {
if (err) {
reject(err);
} else {
resolve({ message: `Container '${containerName}' deleted` });
}
});
});
};
const execute = async () => {
const containerName = "demo";
const blobName = "quickstart.txt";
const content = "hello Blob SDK";
const localFilePath = "./readme.md";
let response;
console.log("Containers:");
response = await listContainers();
response.containers.forEach((container) => console.log(` - ${container.name}`));
const containerDoesNotExist = response.containers.findIndex((container) => container.name === containerName) === -1;
if (containerDoesNotExist) {
await createContainer(containerName);
console.log(`Container "${containerName}" is created`);
}
await uploadString(containerName, blobName, content);
console.log(`Blob "${blobName}" is uploaded`);
response = await uploadLocalFile(containerName, localFilePath);
console.log(response.message);
console.log(`Blobs in "${containerName}" container:`);
response = await listBlobs(containerName);
response.blobs.forEach((blob) => console.log(` - ${blob.name}`));
response = await downloadBlob(containerName, blobName);
console.log(`Downloaded blob content: ${response.text}"`);
await deleteBlob(containerName, blobName);
console.log(`Blob "${blobName}" is deleted`);
await deleteContainer(containerName);
console.log(`Container "${containerName}" is deleted`);
}
execute().then(() => console.log("Done")).catch((e) => console.log(e));