external_storer: Add a log entry limit

This is to ensure that we don't get uncapped log entries. Default is set
to the first 20 logs being saved, and the next 980 being in a circualr
queue (1000 ent

external_storer: Add a log entry limit

This is to ensure that we don't get uncapped log entries. Default is set
to the first 20 logs being saved, and the next 980 being in a circualr
queue (1000 entries in total).

Tested:
Added unit test to ensure that the queue works as intended. Also
verified by injecting 1000 entries to ensure that the buffer indeed
saves the first 20, and caps it 1000.

```
//LogEntry1:
Created: ...Entries/66a97808-1e22-4c1e-b0f6-4b9eb7c714e7/index.json
...
//LogEntry20:
Created: ...Entries/9c07937a-9524-40f1-acef-19db73b46678/index.json
//LogEntry21:
Created: ...Entries/0bfb7ede-8020-4613-bfcf-5815ca176c79/index.json
...
//LogEntry1001:
Removed: ...Entries/0bfb7ede-8020-4613-bfcf-5815ca176c79
Created: ...Entries/31bdf3be-1e87-4e77-922d-9bbac09ac824/index.json
```

We can see that starting on the 1001st log, log entry 21 is deleted to
make room.

Signed-off-by: Brandon Kim <brandonkim@google.com>
Change-Id: Ic2badd7f01741d788cad829c9e203b7c4962fc8e

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Modify D-Bus to using asio server

DBus updates are now using the asio server way.

Tested:
Tested with unit tests and locally on a machine.

Signed-off-by: Kasun Athukorala <kasunath@google.com>
Cha

Modify D-Bus to using asio server

DBus updates are now using the asio server way.

Tested:
Tested with unit tests and locally on a machine.

Signed-off-by: Kasun Athukorala <kasunath@google.com>
Change-Id: I77553bcc3baae70e5d684a62f2c19592ff844665
Signed-off-by: Brandon Kim <brandonkim@google.com>

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sdbusplus: use shorter type aliases

The sdbusplus headers provide shortened aliases for many types.
Switch to using them to provide better code clarity and shorter
lines. Possible replacements are

sdbusplus: use shorter type aliases

The sdbusplus headers provide shortened aliases for many types.
Switch to using them to provide better code clarity and shorter
lines. Possible replacements are for:
* bus_t
* exception_t
* manager_t
* match_t
* message_t
* object_t
* slot_t

Signed-off-by: Patrick Williams <patrick@stwcx.xyz>
Change-Id: I17807e986cefa6a3d9e757c533ac373035438aed

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Create a DBus notification for each LogEntry

For each log entry, a new FilePath DBus object will be created where
the FilePath.path value is the location of the JSON LogEntry file.

Tested:
Tested w

Create a DBus notification for each LogEntry

For each log entry, a new FilePath DBus object will be created where
the FilePath.path value is the location of the JSON LogEntry file.

Tested:
Tested with unit tests and locally on a machine.

Signed-off-by: Kasun Athukorala <kasunath@google.com>
Change-Id: I5999826f7b4447bfca88b83c487d7c03a1c84a08

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Add a class to handle ExternalStorer file writes.

Signed-off-by: Kasun Athukorala <kasunath@google.com>
Change-Id: Ic1092a6a1da3375f595774018abfecd08a3cb7d8