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Allow parallel workers to retrieve some data from Port

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This commit moves authn_id into a new global structure called
ClientConnectionInfo (mapping to a MyClientConnectionInfo for each
backend) which is intended to hold all the client information that
should be shared between the backend and any of its parallel workers,
access for extensions and triggers being the primary use case.  There is
no need to push all the data of Port to the workers, and authn_id is
quite a generic concept so using a separate structure provides the best
balance (the name of the structure has been suggested by Robert Haas).

While on it, and per discussion as this would be useful for a potential
SYSTEM_USER that can be accessed through parallel workers, a second
field is added for the authentication method, copied directly from
Port.

ClientConnectionInfo is serialized and restored using a new parallel
key and a structure tracks the length of the authn_id, making the
addition of more fields straight-forward.

Author: Jacob Champion
Reviewed-by: Bertrand Drouvot, Stephen Frost, Robert Haas, Tom Lane,
Michael Paquier, Julien Rouhaud
Discussion: https://postgr.es/m/793d990837ae5c06a558d58d62de9378ab525d83.camel@vmware.com
This commit is contained in:
Michael Paquier
2022-08-24 12:57:13 +09:00
parent 421892a192
commit d951052a9e
7 changed files with 163 additions and 24 deletions
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4
src/include/miscadmin.h
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@ -482,6 +482,10 @@ extern bool has_rolreplication(Oid roleid);
typedef void (*shmem_request_hook_type) (void);
extern PGDLLIMPORT shmem_request_hook_type shmem_request_hook;
extern Size EstimateClientConnectionInfoSpace(void);
extern void SerializeClientConnectionInfo(Size maxsize, char *start_address);
extern void RestoreClientConnectionInfo(char *conninfo);
/* in executor/nodeHash.c */
extern size_t get_hash_memory_limit(void);