html_url,issue_url,id,node_id,user,created_at,updated_at,author_association,body,reactions,issue,performed_via_github_app
https://github.com/simonw/datasette/issues/838#issuecomment-643083451,https://api.github.com/repos/simonw/datasette/issues/838,643083451,MDEyOklzc3VlQ29tbWVudDY0MzA4MzQ1MQ==,79913,2020-06-12T06:04:14Z,2020-06-12T06:04:14Z,NONE,"Hmm, I haven't tried removing `ProxyPassReverse`, but it doesn't touch the HTML, which is the issue I'm seeing. You can read the [documentation here](https://httpd.apache.org/docs/2.4/mod/mod_proxy.html#proxypassreverse). `ProxyPassReverse` is a standard directive when proxying with Apache. I've used it dozens of times with other applications.
Looking a little more at the code, I think the issue here is that the behaviour of `base_url` makes sense when Datasette is _mounted_ at a path within a larger application, but not when HTTP requests are being _proxied_ to it.
In a _mount_ situation, it is perfectly fine to construct URLs reusing the domain and path from the request. In a _proxy_ situation, it never is, as the domain and path in the request are not the domain and path that the non-proxy client actually needs to use. That is, links which include the Apache → Datasette request origin, `localhost:8001`, instead of the browser → Apache request origin, `example.com`, will be broken.
The tests you pointed to also reflect this in two ways:
1. They strip a leading `http://localhost`, allowing such URLs in the facet links to pass, but inclusion of that in a proxy situation would mean the URL is broken.
2. The test client emits direct ASGI events instead of actual proxied HTTP requests. The headers of these ASGI events don't reflect the way an HTTP proxy works; instead they pass through the original request path which contains `base_url`. This works because Datasette responds to requests equivalently at either `/…` or `/{base_url}/…`, which makes some sense in a _mount_ situation but is unconventional (albeit workable) for a proxied app.
Apps that support being proxied automatically support being mounted, but apps that only support being mounted don't automatically support being proxied.","{""total_count"": 0, ""+1"": 0, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",637395097,
https://github.com/simonw/datasette/issues/838#issuecomment-795893813,https://api.github.com/repos/simonw/datasette/issues/838,795893813,MDEyOklzc3VlQ29tbWVudDc5NTg5MzgxMw==,79913,2021-03-10T18:43:39Z,2021-03-10T18:43:39Z,NONE,"@simonw Unfortunately this issue as I reported it is not actually solved in version 0.55.
Every link which is returned by the `Datasette.absolute_url` method is still wrong, because it uses the request URL as the base. This still includes the suggested facet links and pagination links.
What I wrote originally still stands:
> Although many of the URLs in the pages are correct (presumably because they either use absolute paths which include `base_url` or relative paths), the faceting and pagination links still use fully-qualified URLs pointing at `http://localhost:8001`.
>
> I looked into this a little in the source code, and it seems to be an issue anywhere `request.url` or `request.path` is used, as these contain the values for the request between the frontend (Apache) and backend (Datasette) server. Those properties are primarily used via the `path_with_…` family of utility functions and the `Datasette.absolute_url` method.
Would you prefer to re-open this issue or have me create a new one?
","{""total_count"": 0, ""+1"": 0, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",637395097,
https://github.com/simonw/datasette/issues/838#issuecomment-795939998,https://api.github.com/repos/simonw/datasette/issues/838,795939998,MDEyOklzc3VlQ29tbWVudDc5NTkzOTk5OA==,79913,2021-03-10T19:16:55Z,2021-03-10T19:16:55Z,NONE,"Nod. The problem with the tests is that they're ignoring the origin (hostname, port) of links. In a reverse proxy situation, the frontend request origin is different than the backend request origin. The problem is Datasette generates links with the backend request origin.","{""total_count"": 0, ""+1"": 0, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",637395097,
https://github.com/simonw/datasette/issues/838#issuecomment-795950636,https://api.github.com/repos/simonw/datasette/issues/838,795950636,MDEyOklzc3VlQ29tbWVudDc5NTk1MDYzNg==,79913,2021-03-10T19:24:13Z,2021-03-10T19:24:13Z,NONE,"I think this could be solved by one of:
1. Stop generating absolute URLs, e.g. ones that include an origin. Relative URLs with absolute paths are fine, as long as they take `base_url` into account (as they do now, yay!).
2. Extend `base_url` to include the expected frontend origin, and then use that information when generating absolute URLs.
3. Document which HTTP headers the reverse proxy should set (e.g. the `X-Forwarded-*` family of conventional headers) to pass the frontend origin information to Datasette, and then use that information when generating absolute URLs.
Option 1 seems like the easiest to me, if you can get away with never having to generate an absolute URL.","{""total_count"": 0, ""+1"": 0, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",637395097,
https://github.com/simonw/sqlite-utils/pull/118#issuecomment-655018966,https://api.github.com/repos/simonw/sqlite-utils/issues/118,655018966,MDEyOklzc3VlQ29tbWVudDY1NTAxODk2Ng==,79913,2020-07-07T17:41:06Z,2020-07-07T17:41:06Z,CONTRIBUTOR,"Hmm, while tests pass, this may not work as intended on larger datasets. Looking into it.","{""total_count"": 0, ""+1"": 0, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",651844316,
https://github.com/simonw/sqlite-utils/pull/118#issuecomment-655052451,https://api.github.com/repos/simonw/sqlite-utils/issues/118,655052451,MDEyOklzc3VlQ29tbWVudDY1NTA1MjQ1MQ==,79913,2020-07-07T18:45:23Z,2020-07-07T18:45:23Z,CONTRIBUTOR,"Ah, I see the problem. The truncate is inside a loop I didn't realize was there.","{""total_count"": 0, ""+1"": 0, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",651844316,
https://github.com/simonw/sqlite-utils/pull/118#issuecomment-655239728,https://api.github.com/repos/simonw/sqlite-utils/issues/118,655239728,MDEyOklzc3VlQ29tbWVudDY1NTIzOTcyOA==,79913,2020-07-08T02:16:42Z,2020-07-08T02:16:42Z,CONTRIBUTOR,"I fixed my original oops by moving the `DELETE FROM $table` out of the chunking loop and repushed. I think this change can be considered in isolation from issues around transactions, which I discuss next.
I wanted to make the DELETE + INSERT happen all in the same transaction so it was robust, but that was more complicated than I expected. The transaction handling in the Database/Table classes isn't systematic, and this poses big hurdles to making `Table.insert_all` (or other operations) consistent and robust in the face of errors.
For example, I wanted to do this (whitespace ignored in diff, so indentation change not highlighted):
```diff
diff --git a/sqlite_utils/db.py b/sqlite_utils/db.py
index d6b9ecf..4107ceb 100644
--- a/sqlite_utils/db.py
+++ b/sqlite_utils/db.py
@@ -1028,6 +1028,11 @@ class Table(Queryable):
batch_size = max(1, min(batch_size, SQLITE_MAX_VARS // num_columns))
self.last_rowid = None
self.last_pk = None
+ with self.db.conn:
+ # Explicit BEGIN is necessary because Python's sqlite3 doesn't
+ # issue implicit BEGINs for DDL, only DML. We mix DDL and DML
+ # below and might execute DDL first, e.g. for table creation.
+ self.db.conn.execute(""BEGIN"")
if truncate and self.exists():
self.db.conn.execute(""DELETE FROM [{}];"".format(self.name))
for chunk in chunks(itertools.chain([first_record], records), batch_size):
@@ -1038,7 +1043,11 @@ class Table(Queryable):
# Use the first batch to derive the table names
column_types = suggest_column_types(chunk)
column_types.update(columns or {})
- self.create(
+ # Not self.create() because that is wrapped in its own
+ # transaction and Python's sqlite3 doesn't support
+ # nested transactions.
+ self.db.create_table(
+ self.name,
column_types,
pk,
foreign_keys,
@@ -1139,7 +1148,6 @@ class Table(Queryable):
flat_values = list(itertools.chain(*values))
queries_and_params = [(sql, flat_values)]
- with self.db.conn:
for query, params in queries_and_params:
try:
result = self.db.conn.execute(query, params)
```
but that fails in tests because other methods call `insert/upsert/insert_all/upsert_all` in the middle of their transactions, so the BEGIN statement throws an error (no nested transactions allowed).
Stepping back, it would be nice to make the transaction handling systematic and predictable. One way to do this is to make the `sqlite_utils/db.py` code generally not begin or commit any transactions, and require the caller to do that instead. This lets the caller mix and match the Python API calls into transactions as appropriate (which is impossible for the API methods themselves to fully determine). Then, make `sqlite_utils/cli.py` begin and commit a transaction in each `@cli.command` function, making each command robust and consistent in the face of errors. The big change here, and why I didn't just submit a patch, is that it dramatically changes the Python API to _require_ callers to begin a transaction rather than just immediately calling methods.
There is also the caveat that for each transaction, an explicit `BEGIN` is also necessary so that DDL as well as DML (as well as `SELECT`s) are consistent and rolled back on error. There are several bugs.python.org discussions around this particular problem of DDL and some plans to make it better and consistent with DBAPI2, eventually. In the meantime, the sqlite-utils Database class could be a context manager which supports the incantations necessary to do proper transactions. This would still be a Python API change for callers but wouldn't expose them to the weirdness of the sqlite3's default transaction handling.","{""total_count"": 0, ""+1"": 0, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",651844316,
https://github.com/simonw/sqlite-utils/pull/118#issuecomment-655643078,https://api.github.com/repos/simonw/sqlite-utils/issues/118,655643078,MDEyOklzc3VlQ29tbWVudDY1NTY0MzA3OA==,79913,2020-07-08T17:05:59Z,2020-07-08T17:05:59Z,CONTRIBUTOR,"> The only thing missing from this PR is updates to the documentation.
Ah, yes, thanks for this reminder! I've repushed with doc bits added.","{""total_count"": 0, ""+1"": 0, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",651844316,
https://github.com/simonw/sqlite-utils/issues/121#issuecomment-655898722,https://api.github.com/repos/simonw/sqlite-utils/issues/121,655898722,MDEyOklzc3VlQ29tbWVudDY1NTg5ODcyMg==,79913,2020-07-09T04:53:08Z,2020-07-09T04:53:08Z,CONTRIBUTOR,"Yep, I agree that makes more sense for backwards compat and more casual use cases. I think it should be possible for the Database/Queryable methods to DTRT based on seeing if it's within a context-manager-managed transaction.","{""total_count"": 0, ""+1"": 0, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",652961907,