Created
December 13, 2016 08:27
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Micropython (ESP8266): Download files from a known server to populate the filesystem with necessary files.
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import ujson as json | |
import uos as os | |
import usocket as socket | |
# todo: https | |
def http_get_async(url): | |
_, _, host, path = url.split('/', 3) | |
if ':' in host: | |
host, port = host.split(':') | |
else: | |
port = 80 | |
addr = socket.getaddrinfo(host, port)[0][-1] | |
s = socket.socket() | |
s.connect(addr) | |
s.send(bytes('GET /%s HTTP/1.0\r\nHost: %s\r\n\r\n' % (path, host), | |
'utf8')) | |
started = False | |
header_str = b'' | |
headers = {} | |
while True: | |
data = s.recv(1000) | |
if data: | |
body_bytes = data | |
if not started and b'HTTP' in body_bytes: | |
started = True | |
continue | |
buffer = header_str + body_bytes | |
if not headers and not b'\r\n\r\n' in buffer: | |
header_str += body_bytes | |
continue | |
if b'\r\n\r\n' in buffer: | |
headers, body_bytes = buffer.split(b'\r\n\r\n') | |
if body_bytes: | |
yield body_bytes | |
else: | |
break | |
def http_get(url): | |
response = b'' | |
try: | |
get = http_get_async(url) | |
while True: | |
file_bytes = get.send(None) | |
response += file_bytes | |
except StopIteration: | |
pass | |
response_str = str(response, 'utf-8') | |
return response_str | |
def ensure_dirs(path): | |
split_path = path.split('/') | |
if len(split_path) > 1: | |
for i, fragment in enumerate(split_path): | |
parent = '/'.join(split_path[:-i]) | |
try: | |
os.mkdir(parent) | |
except OSError: | |
pass | |
def http_get_to_file(url, path): | |
ensure_dirs(path) | |
with open(path, 'w') as outfile: | |
try: | |
get = http_get_async(url) | |
while True: | |
file_bytes = get.send(None) | |
outfile.write(file_bytes) | |
except StopIteration: | |
outfile.close() | |
def start(url='http://192.168.1.107:5000/esp8266/files.json'): | |
response = json.loads(http_get(url)) | |
for file in response['files']: | |
path = file['path'] | |
url = 'http://192.168.1.107:5000/esp8266/{}'.format(path) | |
http_get_to_file(url, path) | |
if __name__ == '__main__': | |
start() |
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I always get this error on the ESP32:
MemoryError: memory allocation failed, allocating 13925 bytes