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mock-kv.mjs
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mock-kv.mjs
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import {
mkdir,
readFile,
unlink,
writeFile,
} from 'fs/promises'
import http from 'http'
import { dirname, join } from 'path'
import querystring from 'querystring'
const DEFAULT_PORT = 3333
const ENCODING_JSON = 'application/json'
const ENCODING_PLAIN = 'text/plain'
const MAX_REQUEST_BODY_SIZE = 65536
const STORAGE_DIR = join(
dirname(
import.meta.url.replace('file://', '')
),
'.tmp-kv'
)
async function main() {
const portEnv = parseInt(
process.env.PORT,
10
)
const port =
Number.isFinite(portEnv) &&
portEnv >= 1 &&
portEnv < 65536
? portEnv
: DEFAULT_PORT
async function diskPath(
namespace,
key
) {
const namespaceDirPath = join(
STORAGE_DIR,
encodeURIComponent(namespace)
)
await mkdir(namespaceDirPath, {
recursive: true,
// todo cache our knowledge that the directory
// exists for performance enhancement here
})
return join(
STORAGE_DIR,
encodeURIComponent(namespace),
encodeURIComponent(key)
)
}
const diskMap = /* undefined && */ {
async delete(key) {
const namespace = key.split('#')[0]
try {
await unlink(
await diskPath(namespace, key)
)
return true
} catch (e) {
return false
}
},
async get(key) {
const namespace = key.split('#')[0]
try {
return (
await readFile(
await diskPath(namespace, key)
)
).toString('utf8')
} catch (e) {
return null
}
},
async set(key, value) {
const namespace = key.split('#')[0]
await writeFile(
await diskPath(namespace, key),
value,
'utf8'
)
},
}
await mkdir(STORAGE_DIR, {
recursive: true,
})
const MEMORY = diskMap ?? new Map()
const MEMORY_EXPIRE_KEY = new Map()
const httpServer = http.createServer(
async function (request, response) {
try {
const [
requestPath,
requestParamString,
] = request.url.split('?')
const requestParams =
querystring.parse(
requestParamString ?? ''
)
console.log(
request.method,
requestPath,
JSON.stringify(requestParams)
)
switch (request.method) {
case 'DELETE':
response.statusCode = 200
response.end(
(
await MEMORY.delete(
requestParams.key
)
).toString()
)
return
case 'GET':
response.statusCode = 200
response.end(
(await MEMORY.get(
requestParams.key
)) ?? ''
)
return
case 'POST':
const requestBody =
await collectBody(request)
await MEMORY.set(
requestParams.key,
requestBody
)
response.statusCode = 200
const ttl = parseInt(
requestParams.expiration_ttl,
10
)
clearTimeout(
MEMORY_EXPIRE_KEY.get(
requestParams.key
)
)
async function eraseMemoryKey() {
await MEMORY.delete(
requestParams.key
)
}
if (!isNaN(ttl)) {
MEMORY_EXPIRE_KEY.set(
requestParams.key,
setTimeout(eraseMemoryKey, ttl)
)
}
response.end()
return
default:
response.statusCode = 405
response.end('invalid method')
return
}
} catch (e) {
console.error(e)
response.statusCode =
e.statusCode ?? 500
response.setHeader(
'Content-Type',
'text/plain; charset=utf-8'
)
response.end(e.message)
}
}
)
httpServer.listen(
port,
'localhost',
function () {
console.log(
`Server listening on http://localhost:${port}`
)
console.log('Available operations:')
console.log('')
console.log(' • Read value at key')
console.log(
' GET ?key=urlEncodedKey'
)
console.log('')
console.log(' • Delete value at key')
console.log(
' DELETE ?key=urlEncodedKey'
)
console.log('')
console.log(
' • Write value at key (expires in 60 seconds)'
)
console.log(
' POST ?key=urlEncodedKey&expiration_ttl=60 <body>'
)
console.log('')
}
)
}
main().catch(function (e) {
console.error(e)
})
async function collectBody(request) {
return new Promise(function (
resolve,
reject
) {
let error = false
const contentTypeHeader =
request.headers['content-type'] ?? ''
const [contentType] =
contentTypeHeader.split(';')
if (contentType === ENCODING_JSON) {
const bodyChunks = []
let bodySize = 0
request.on('data', function (chunk) {
if (!error) {
bodyChunks.push(chunk)
bodySize += chunk.length
if (
bodySize > MAX_REQUEST_BODY_SIZE
) {
error = true
reject(
new Error(
`request body size cannot exceed ${MAX_REQUEST_BODY_SIZE} bytes`
)
)
}
}
})
request.on('end', function () {
if (!error) {
resolve(
JSON.parse(
Buffer.concat(bodyChunks)
)
)
}
})
} else if (
contentType === ENCODING_PLAIN
) {
const bodyChunks = []
let bodySize = 0
request.on('data', function (chunk) {
if (!error) {
bodyChunks.push(chunk)
bodySize += chunk.length
if (
bodySize > MAX_REQUEST_BODY_SIZE
) {
error = true
reject(
new Error(
`request body size cannot exceed ${MAX_REQUEST_BODY_SIZE} bytes`
)
)
}
}
})
request.on('end', function () {
if (!error) {
resolve(Buffer.concat(bodyChunks))
}
})
} else {
resolve({})
}
})
}