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betterjsshDB doc

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Kay Marquardt (Gnadelwartz) 2020-05-27 22:53:47 +02:00
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doc/6_reference.md
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@ -470,11 +470,11 @@ The file extions is '.jssh' and for security reasons location of jssh files is r
jsshDB files are simple text files and if you append a new Key/value pairs to the end of the file it overwrites jsshDB files are simple text files and if you append a new Key/value pairs to the end of the file it overwrites
an existing key/value pair. We use this behaivor for "fast" file operations. an existing key/value pair. We use this behaivor for "fast" file operations.
"slow funtions" simply add a new key/value pair without deleting an existing key/value pair, this is fast but over (long) "fast funtions" add a new key/value pair to the end of the file without deleting an existing one, this is fast but over (long)
time the file grows infinitly. time the file grows infinitly.
"slow funtions" in contrast modify the key/value pairs and write the whole file back, "slow funtions" in contrast modify the key/value pairs in place and write the whole file back,
this is slower but does clean up the file. All duplicate key/value pairs are deleted this is slower but clean up the file. All previously added key/value pairs are replaced
and only the last one is written back to the file. and only the last one is written back to the file.
fast functions: fast functions:
@ -490,22 +490,21 @@ slow functions:
``` ```
#### File nameing and locking #### File naming and locking
A jssh fileDB consists of maximum two files witch must reside inside BASHBOT_ETC or BASHBOT_DATA. A jssh fileDB consists of two files which must reside inside BASHBOT_ETC or BASHBOT_DATA.
- `filename.jssh` is a text file containing the data in the format as json.sh outputs. - `filename.jssh` is a text file containing the key/value data in json.sh format´s.
- optional file `filename.jssh.flock` used for read/write locking with flock - `filename.jssh.flock` is used for read/write locking with flock
Path names names containing '..' and absolute path names pointing outside BASHBOT_ETC or BASHBOT_DATA are refused by jsshDB functions. Path names containing `..` or not in BASHBOT_ETC or BASHBOT_DATA are refused by jsshDB functions with an error.
Since version 0.94 jsshDB functions support file locking with flock. Write / Update operations use flock to wait until Since version 0.94 jsshDB functions support file locking with flock. Write/Update operations are serialised with flock to wait until
previous operations are finished. see "man flock" for more information. Bashbot uses a maximum timeout of 10 seconds for flock. previous operations are finished, see "man flock" for more information. To avoid deadlocks flock is used with a timeout of 10s for write and 5s for read operations.
If you don't want atomic write / update operations use the *_async variant of jsshDB functions. If flock is not availible In case flock is mot availibe or you don't want locking, jsshDB functions will be used without file locking by using *_async variants.
the *_async variant is automatically used.
*Example:* for file name: *Example:* for allowed file names:
```bash ```bash
# bashbot is installed in /usr/local/telegram-bot-bash, BASHBOT_ETC is not set. # bashbot is installed in /usr/local/telegram-bot-bash, BASHBOT_ETC is not set.
"myfile" -> /usr/local/telegram-bot-bash/myfile.jssh "myfile" -> /usr/local/telegram-bot-bash/myfile.jssh
@ -1020,5 +1019,5 @@ The name of your bot is availible as bash variable "$ME", there is no need to ca
#### [Prev Best Practice](5_practice.md) #### [Prev Best Practice](5_practice.md)
#### [Next Notes for Developers](7_develop.md) #### [Next Notes for Developers](7_develop.md)
#### $$VERSION$$ 0.96-dev2-2-ga7997f2 #### $$VERSION$$ 0.96-dev2-3-g975f99a