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Web archive index server based on RocksDB
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A RocksDB-based capture index (CDX) server for web archives.
Used in production at the National Library of Australia and British Library with 8-9 billion record indexes.
OutbackCDX requires JDK 8 and 11 on x86-64 Linux, Windows or MacOS (other platforms would require a custom build of RocksDB JNI).
Pre-compiled jar packages are available from the releases page.
To build from source install Maven and then run:
The server supports multiple named indexes as subdirectories. Currently indexes are created automatically when you first write records to them.
OutbackCDX does not include a CDX indexing tool for reading WARC or ARC files. Use the cdx-indexer scripts included with OpenWayback or PyWb.
You can load records into the index by POSTing them in the (11-field) CDX format Wayback uses:
The canonicalized URL (first field) is ignored, OutbackCDX performs its own canonicalization.
By default OutbackCDX will not ingest any records from a POSTed CDX if any of the lines are invalid. If you wish to only skip malformed lines and have OutbackCDX ingest all the other, valid lines you can add the parameter badLines with the value skip. Example:
Limitation: Loading an extremely large number of CDX records in one POST request can cause an out of memory error. Until this is fixed you may need to break your request up into several smaller ones. Most users send one POST per WARC file.
Deleting records works the same way as loading them. POST the records you wish to delete to /{collection}/delete:
When deleting OutbackCDX does not check whether the records actually existed in the index. Deleting non-existent records has no effect and will not cause an error.
Records can be queried in CDX format:
Query URLs that match a given URL prefix:
Find the first 5 URLs with a given domain:
Find the next 10 URLs in the index starting from the given URL prefix:
Return results ordered closest to furthest from a given timestamp:
See the API Documentation for more details about the available options.
Point Wayback at a OutbackCDX index by configuring a RemoteResourceIndex. See the example RemoteCollection.xml shipped with OpenWayback.
Create a pywb config.yaml file containing:
The ukwa-heritrix project includes some classes that allow OutbackCDX to be used as a source of deduplication data for Heritrix crawls.
Access control can be enabled by setting the following environment variable:
Rules can be configured through the GUI. Have Wayback or other clients query a particular named access point. For example to query the 'public' access point.
See docs/access-control.md for details of the access control model.
Alias records allow the grouping of URLs so they will deliver as if they are different snapshots of the same page.
Aliases do not currently work with url prefix queries. Aliases are resolved after normal canonicalisation rules are applied.
Aliases can be mixed with regular CDX lines either in the same file or separate files and in any order. Any existing records that the alias rule affects the canonicalised URL for will be updated when the alias is added to the index.
Deletion of aliases is not yet implemented.
RocksDB some data in memory (binary search index, bloom filter) for each open SST file. This improves performance at the cost of using more memory. OutbackCDX uses the following heuristic by default to limit the maximum number of open SST files in an attempt not to exhaust the system's memory.
This default may not be suitable when multiple large indexes are in use or when OutbackCDX is sharing a server with many other processes. You can override the limit OutbackCDX's -m option.
If you find OutbackCDX using too much memory or you need more performance try adjusting the limit. The optimal setting will depend on your index size and hardware. If you have a lot of memory -m -1 (no limit) will allow RocksDB to open all SST files on startup and should give the best query performance. However with slow disks it can also make startup very slow. You may also need to increase the kernel's max open file description limit (ulimit -n).
By default OutbackCDX is unsecured and assumes some external method of authorization such as firewall rules or a reverse proxy are used to secure it. Take care not to expose it to the public internet.
Alternatively one of the following authorization methods can be enabled.
Authorization to modify the index and access control rules can be controlled using JSON Web Tokens. To enable this you will typically use some sort of separate authentication server to sign the JWTs.
OutbackCDX's -j option takes two arguments, a JWKS URL for the public key of the auth server and a slash-delimited path for where to find the list of permissions in the JWT received as a HTTP bearer token. Refer to your auth server's documentation for what to use.
Currently the OutbackCDX web dashboard does not support generic JWT/OIDC authorization. (Patches welcome.)
OutbackCDX can use Keycloak as an auth server to secure both the API and dashboard.
Note: JWT authentication will be enabled automatically when using Keycloak. You don't need to set the -j option.
OutbackCDX can be configured to compute a field using a HMAC or cryptographic digest. This feature is intended to be used in conjunction with a web server or cloud storage provider which provides temporary access to WARC files using a signed URL. To allow compatibility with a variety of different storage servers the structure of the message and field values are configured using templates.
The field will be made available as name to the fl CDX query parameter. Multiple HMAC fields can be defined as long as they have different names.
The algorithm may be one of HmacSHA256, HmacSHA1, HmacMD5, SHA-256, SHA-1, MD5 or any other MAC or MessageDigest from a Java security provider. Your system may have additional algorithms available depending on the version and configuration of Java.
The message-template configures the input to the HMAC or digest function. See the list of templates variables below.
The field-template configures the field value returned and is typically used to construct a URL. See the list of templates variables below.
The secret-key is the key of the HMAC functions. When using non-HMAC digest functions (which don't have a natural key parameter) the key may be substituted into the message-template using $secret_value.
The expiry-secs parameter is used to calculate an expiry time for this secure link. If you don't use the $expires variable just set it to zero.
In addition to the fields of each capture record ($filename, $length, $offset etc) the following extra variables are available in templates:
The alternative variable syntax ${filename} may also be used.
Note: The secure link module bundled with nginx uses the insecure MD5 algorithm. Consider using the community-developed HMAC secure link module instead.
(Based on the S3 documentation but as yet untested.)
Replace s3-access-key-id, s3-secret-key and bucket with appropriate values:
Web archive index server based on RocksDB

A toolkit for CDX indices such as Common Crawl and the Internet Archive's Wayback Machine
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cdx_toolkit is a set of tools for working with CDX indices of web crawls and archives, including those at CommonCrawl and the Internet Archive's Wayback Machine.
CommonCrawl uses Ilya Kreymer's pywb to serve the CDX API, which is somewhat different from the Internet Archive's CDX API server. cdx_toolkit hides these differences as best it can. cdx_toolkit also knits together the monthly Common Crawl CDX indices into a single, virtual index.
Finally, cdx_toolkit allows extracting archived pages from CC and IA into WARC files. If you're looking to create subsets of CC or IA data and then process them into WET or WAT files, this is a feature you'll find useful.
or clone this repo and use python ./setup.py install.
cdxt takes a large number of command line switches, controlling the time period and all other CDX query options. cdxt can generate WARC, jsonl, and csv outputs.
** Note that by default, cdxt --cc will iterate over the previous year of captures. **
for full details. Note that argument order really matters; each switch is valid only either before or after the {iter,warc,size} command.
Add -v (or -vv) to see what's going on under the hood.
You can also fetch the content of the web capture as bytes:
There's a full example of iterating and selecting a subset of captures to write into an extracted WARC file in examples/iter-and-warc.py
Filters can be used to limit captures to a subset of the results.
Any field name listed in cdxt iter --all-fields can be used in a filter. These field names are appropriately renamed if the source is 'ia'. The different syntax of filter modifiers for 'ia' and 'cc' is not fully abstracted away by cdx_toolkit.
The basic syntax of a filter is [modifier]field:expression, for example =status:200 or !=status:200.
'cc'-style filters (pywb) come in six flavors: substring match, exact string, full-match regex, and their inversions. These are indicated by a modifier of nothing, '=', '~', '!', '!=', and '!~', respectively.
'ia'-style filters (Wayback/OpenWayback) come in two flavors, a full-match regex and an inverted full-match regex: 'status:200' and '!status:200'
Multiple filters will be combined with AND. For example, to limit captures to those which do not have status 200 and do not have status 404,
Note that filters that discard large numbers of captures put a high load on the CDX server -- for example, a filter that returns just a few captures from a domain that has tens of millions of captures is likely to run very slowly and annoy the owner of the CDX server.
cdx_toolkit supports all (ok, most!) of the options and fields discussed in the CDX API documentation:
A capture is a single crawled url, be it a copy of a webpage, a redirect to another page, an error such as 404 (page not found), or a revisit record (page identical to a previous capture.)
The url used by cdx_tools can be wildcarded in two ways. One way is *.example.com, which in CDX jargon sets matchType='domain', and will return captures for blog.example.com, support.example.com, etc. The other, example.com/*, will return captures for any page on example.com.
A timestamp represents year-month-day-time as a string of digits run togther. Example: January 5, 2016 at 12:34:56 UTC is 20160105123456. These timestamps are a field in the index, and are also used to pick specify the dates used by --from=, --to, and --closest on the command-line. (Programmatically, use from_ts=, to=, and closest=.)
An urlkey is a SURT, which is a munged-up url suitable for deduplication and sorting. This sort order is how CDX indices efficiently support queries like *.example.com. The SURTs for www.example.com and example.com are identical, which is handy when these 2 hosts actually have identical web content. The original url should be present in all records, if you want to know exactly what it is.
The limit argument limits how many captures will be returned. To help users not shoot themselves in the foot, a limit of 1,000 is applied to --get and .get() calls.
A filter allows a user to select a subset of CDX records, reducing network traffic between the CDX API server and the user. For example, filter='!status:200' will only show captures whose http status is not 200. Multiple filters can be specified as a list (in the api) and on the command line (by specifying --filter more than once). Filters and limit work together, with the limit applying to the count of captures after the filter is applied. Note that revisit records have a status of '-', not 200.
CDX API servers support a paged interface for efficient access to large sets of URLs. cdx_toolkit iterators always use the paged interface. cdx_toolkit is also polite to CDX servers by being single-threaded and serial. If it's not fast enough for you, consider downloading Common Crawl's index files directly.
A digest is a sha1 checksum of the contents of a capture. The purpose of a digest is to be able to easily figure out if 2 captures have identical content.
Common Crawl publishes a new index each month. cdx_toolkit will start using new ones as soon as they are published. By default, cdx_toolkit will use the most recent 12 months of Common Crawl; you can change that using --from or from_ts= and --to or to=.
CDX implementations do not efficiently support reversed sort orders, so cdx_toolkit results will be ordered by ascending SURT and by ascending timestamp. However, since CC has an individual index for each month, and because most users want more recent results, cdx_toolkit defaults to querying CC's CDX indices in decreasing month order, but each month's result will be in ascending SURT and ascending timestamp. This default sort order is named 'mixed'. If you'd like pure ascending, set --cc-sort or cc_sort= to 'ascending'. You may want to also specify --from or from_ts= to set a starting timestamp.
The main problem with this ascending sort order is that it's a pain to get the most recent N captures: --limit and limit= will return the oldest N captures. With the 'mixed' ordering, a large enough limit= will get close to returning the most recent N captures.
Content downloading needs help with charset issues, preferably figuring out the charset using an algorithm similar to browsers.
WARC generation should do smart(er) things with revisit records.
Right now the CC code selects which monthly CC indices to use based solely on date ranges. It would be nice to have an alternative so that a client could iterate against the most recent N CC indices, and also have the default one-year lookback use an entire monthly index instead of a partial one.
cdx_toolkit has reached the beta-testing stage of development.
Copyright 2018-2020 Greg Lindahl and others
Licensed under the Apache License, Version 2.0 (the "License"); you may not use this software except in compliance with the License. You may obtain a copy of the License at
Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.
A toolkit for CDX indices such as Common Crawl and the Internet Archive's Wayback Machine

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