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pump_json.py
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pump_json.py
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#!/usr/bin/env python3
import json
import logging
import os
import zipfile
from typing import Any, Dict, List, Optional, Tuple
import couchbaseConstants
import pump
JSON_SCHEME = "json://"
class JSONSource(pump.Source):
"""Reads json file or directory or zip file that contains json files."""
def __init__(self, opts, spec, source_bucket, source_node,
source_map, sink_map, ctl, cur):
super(JSONSource, self).__init__(opts, spec, source_bucket, source_node,
source_map, sink_map, ctl, cur)
self.done: bool = False
self.docs = list()
self.file_iter = None
@staticmethod
def can_handle(opts, spec: str) -> bool:
return spec.startswith(JSON_SCHEME) and \
(os.path.isfile(spec.replace(JSON_SCHEME, ""))
or os.path.isdir(spec.replace(JSON_SCHEME, ""))
or spec.endswith(".zip"))
@staticmethod
def check(opts, spec: str) -> Tuple[couchbaseConstants.PUMP_ERROR, Dict[str, Any]]:
return 0, {'spec': spec,
'buckets': [{'name': os.path.normpath(os.path.basename(spec)),
'nodes': [{'hostname': 'N/A'}]}]}
def save_doc(self, batch: pump.Batch, dockey: bytes, docvalue: bytes):
cmd = couchbaseConstants.CMD_TAP_MUTATION
vbucket_id = 0x0000ffff
# common flags: 0x02000000 (JSON)
# legacy flags: 0x00000006 (JSON)
cas, exp, flg = 0, 0, 0x02000006
try:
doc = json.loads(docvalue)
if '_id' not in doc:
msg = (cmd, vbucket_id, dockey, flg, exp, cas, b'', docvalue, 0, 0, 0, 0)
batch.append(msg, len(docvalue))
except ValueError as error:
logging.error(f'Fail to read json file with error: {error!s}')
@staticmethod
def gen_dockey(filename: str) -> str:
return os.path.splitext(os.path.basename(filename))[0]
@staticmethod
def enumerate_files(subdir: str, file_candidate: List[str], skip_views: bool, skip_docs: bool):
for item in os.listdir(subdir):
path = os.path.join(subdir, item)
if os.path.isfile(path):
if (not skip_views and "design_docs" in path.split(os.path.sep)) or \
(not skip_docs and "docs" in path.split(os.path.sep)):
file_candidate.append(path)
else:
if not ((skip_docs and "docs" in path.split(os.path.sep))
or (skip_views and "design_docs" in path.split(os.path.sep))):
JSONSource.enumerate_files(path, file_candidate, skip_views, skip_docs)
@staticmethod
def provide_design(opts, source_spec: str, source_bucket, source_map) -> Tuple[couchbaseConstants.PUMP_ERROR,
List[bytes]]:
design_files = list()
f = source_spec.replace(JSON_SCHEME, "")
if os.path.isfile(f) and f.endswith(".zip"):
zf = zipfile.ZipFile(f)
for path in zf.namelist():
file = os.path.basename(path)
# Skip the design_docs directory listing
if file == "design_docs":
continue
dir = os.path.basename(os.path.dirname(path))
# Skip all files not in the design docs directory
if dir != "design_docs":
continue
design_files.append(zf.read(path))
zf.close()
elif os.path.isdir(f):
files: List[str] = list()
JSONSource.enumerate_files(f, files, False, True)
for path in files:
if os.path.isfile(path):
f = open(path, 'rb') # type: ignore
design_files.append(f.read()) # type: ignore
f.close() # type: ignore
return 0, design_files
def provide_batch(self) -> Tuple[couchbaseConstants.PUMP_ERROR, Optional[pump.Batch]]:
if self.done:
return 0, None
# During the first iteration load the file names, this is only run once
if not self.docs:
self.prepare_docs()
batch = pump.Batch(self)
f = self.spec.replace(JSON_SCHEME, "")
batch_max_size = self.opts.extra['batch_max_size']
# Each iteration should return a batch or mark the loading a finished
if os.path.isfile(f) and f.endswith(".zip"):
zf = zipfile.ZipFile(f)
while batch.size() < batch_max_size and self.docs:
path = self.docs.pop()
key = os.path.basename(path)
if key.endswith('.json'):
key = key[:-5]
value = zf.read(path)
self.save_doc(batch, key, value)
zf.close()
else:
while batch.size() < batch_max_size and self.docs:
path = self.docs.pop()
key = os.path.basename(path)
if key.endswith('.json'):
key = key[:-5]
try:
fp = open(path, 'rb')
value = fp.read()
fp.close()
self.save_doc(batch, key.encode(), value)
except IOError as error:
logging.error(f'Fail to load json file with error: {error!s}')
if not self.docs:
self.done = True
return 0, batch
def prepare_docs(self):
f = self.spec.replace(JSON_SCHEME, "")
root_name = os.path.basename(f).split('.')[0]
if os.path.isfile(f) and f.endswith(".zip"):
zf = zipfile.ZipFile(f)
for path in zf.namelist():
file = os.path.basename(path)
# Skip the docs directory listing
if file == "docs":
continue
dir = os.path.basename(os.path.dirname(path))
# This condition is not allowed by the spec, but we allowing it
# because the training team did properly follow the spec and we
# don't want to break their training material. Since this tool
# will be deprecated soon we are making an exception and
# allowing this.
if dir == "" or dir == root_name:
self.docs.append(path)
continue
# Skip all files not in the docs directory
# Note that we use a forward slash for all operating systems
# because this is a zip file and zip paths always use a forward
# slash
if "docs" not in path.split("/"):
continue
self.docs.append(path)
zf.close()
elif os.path.isdir(f):
JSONSource.enumerate_files(f, self.docs, True, False)
else:
self.docs.append(f)