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Read and write spage.

Project description

# os-spage

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Read and write Spage.

Spage is an incompact data structure to specify fetched record. Generally speaking, it contains four sub-blocks: *url*, *inner_header*, *http_header*, and *data*.

- __url__: the URL.
- __inner_header__: key-values, can be used to record fetch/process info, such as fetch-time, data-digest, record-type, ect.
- __http_header__: key-values, server's response HTTP Header as you know.
- __data__: fetched data, can be flat or compressed html.

We use dict type to implements Spage. A predefined [schema]( can be used for validating.

It is common to write Spage to size-rotate-file, we choice [os-rotatefile]( as default back-end.

__Notice__: os-spage should not be used for strict serialization/deserialization purpose, it will lose type info when written, all data will be read as string(unicode python2) after all.


From v0.4, this libaray support reading from offpage. Offpage is another data storage format, include url, headers and series data. You can use ``read/open_file`` methods with ``page_type="offpage"`` to read from offpage.

# Install

`pip install os-spage`

# Usage

* Write to size-rotate-file

from os_spage import open_file

url = ''
inner_header = {'User-Agent': 'Mozilla/5.0', 'batchID': 'test'}
http_header = {'Content-Type': 'text/html'}
data = b"Hello world!"

f = open_file('file', 'w', roll_size='1G', compress=True)
f.write(url, inner_header=inner_header, http_header=http_header, data=data, flush=True)

* Read from size-rotate-file

from os_spage import open_file

f = open_file('file', 'r')

for record in

* R/W with other file-like object

from io import BytesIO
from os_spage import read, write

s = BytesIO()
write(s, "")
for record in read(s):

# Unit Tests

`$ tox`

# License

MIT licensed.

Project details

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