https://github.com/ulfox/dby
Simple Yaml DB
https://github.com/ulfox/dby
database db go golang yaml
Last synced: 16 days ago
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Simple Yaml DB
- Host: GitHub
- URL: https://github.com/ulfox/dby
- Owner: ulfox
- License: mit
- Created: 2021-08-23T11:25:39.000Z (over 3 years ago)
- Default Branch: main
- Last Pushed: 2021-09-18T17:20:32.000Z (over 3 years ago)
- Last Synced: 2025-04-14T01:43:11.910Z (17 days ago)
- Topics: database, db, go, golang, yaml
- Language: Go
- Homepage:
- Size: 208 KB
- Stars: 60
- Watchers: 2
- Forks: 6
- Open Issues: 1
-
Metadata Files:
- Readme: README.md
- License: LICENSE
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README
## DB Yaml
Simple DB using yaml. A project for managing the content of yaml files.
Table of Contents
=================
- [DB Yaml](#db-yaml)
- [Features](#features)
- [Usage](#usage)
* [Write to DB](#write-to-db)
* [Query DB](#query-db)
+ [Get First Key](#get-first-key)
+ [Search for Keys](#search-for-keys)
* [Query Path](#query-path)
+ [Query Path with Arrays](#query-path-with-arrays)
- [Without trailing array](#without-trailing-array)
- [With trailing array](#with-trailing-array)
* [Delete Key By Path](#delete-key-by-path)
* [Document Management](#document-management)
+ [Add a new doc](#add-a-new-doc)
+ [Switch Doc](#switch-doc)
+ [Document names](#document-names)
- [Name documents manually](#name-documents-manually)
- [Name all documents automatically](#name-all-documents-automatically)
- [Switch between docs by name](#switch-between-docs-by-name)
+ [Import Docs](#import-docs)
+ [Global Commands](#global-commands)
- [Global Upsert](#global-upsert)
- [Global Update](#global-update)
- [Global GetFirst](#global-getfirst)
- [Global FindKeys](#global-findkeys)
- [Global GetPath](#global-getpath)
- [Global Delete](#global-delete)
* [Convert Utils](#convert-utils)
+ [Get map of strings from interface](#get-map-of-strings-from-interface)
- [Get map directly from a GetPath object](#get-map-directly-from-a-getpath-object)
- [Get map manually](#get-map-manually)
+ [Get array of string from interface](#get-array-of-string-from-interface)
- [Get array directly from a GetPath object](#get-array-directly-from-a-getpath-object)
- [Get array manually](#get-array-manually)
## Features
The module can do
- Create/Load yaml files
- Update content
- Get values from keys
- Query for keys
- Delete keys
- Merge content
## Usage
Simple examples for working with yaml files as db
### Initiate a new stateful DB
Create a new local DB
```go
package main
import (
"github.com/sirupsen/logrus"
"github.com/ulfox/dby/db"
)
func main() {
logger := logrus.New()
state, err := db.NewStorageFactory("local/db.yaml")
if err != nil {
logger.Fatalf(err.Error())
}
}
```
The code above will create a new yaml file under **local** directory.
### Initiate a new stateless DB
```go
package main
import (
"github.com/sirupsen/logrus"
"github.com/ulfox/dby/db"
)
func main() {
logger := logrus.New()
state, err := db.NewStorageFactory()
if err != nil {
logger.Fatalf(err.Error())
}
}
```
Initiating a db without arguments will not create/write/read from a file. All operations
will be done in memory and unless the caller saves the data externally, all data will be lose
on termination
### Write to DB
Insert a map to the local yaml file.
```go
err = state.Upsert(
"some.path",
map[string]string{
"key-1": "value-1",
"key-2": "value-2",
},
)
if err != nil {
logger.Fatalf(err.Error())
}
```
### Query DB
#### Get First Key
Get the value of the first key in the hierarchy (if any)
```go
val, err := state.GetFirst("key-1")
if err != nil {
logger.Fatalf(err.Error())
}
logger.Info(val)
```
For example if we have the following structure
```yaml
key-1:
key-2:
key-3: "1"
key-3: "2"
```
And we query for `key-3`, then we will get back **"2"** and not **"1"**
since `key-3` appears first on a higher layer with a value of **2**
#### Search for keys
Get all they keys (if any). This returns the full path for the key,
not the key values. To get the values check the next section **GetPath**
```go
keys, err := state.FindKeys("key-1")
if err != nil {
logger.Fatalf(err.Error())
}
logger.Info(keys)
```
From the previous example, this query would have returned
```yaml
["key-1.key-2.key-3", "key-1.key-3"]
```
### Query Path
Get the value from a given path (if any)
For example if we have in yaml file the following key-path
```yaml
key-1:
key-2:
key-3: someValue
```
Then to get someValue, issue
```go
keyPath, err := state.GetPath("key-1.key-2.key-3")
if err != nil {
logger.Fatalf(err.Error())
}
logger.Info(keyPath)
```
#### Query Path with Arrays
We can also query paths that have arrays.
##### Without trailing array
```yaml
key-1:
key-2:
- key-3:
key-4: value-1
```
To get the value of `key-4`, issue
```go
keyPath, err := state.GetPath("key-1.key-2.[0].key-3.key-4")
if err != nil {
logger.Fatalf(err.Error())
}
logger.Info(keyPath)
```
##### With trailing array
```yaml
key-1:
key-2:
- value-1
- value-2
- value-3
```
To get the first index of `key-2`, issue
```go
keyPath, err := state.GetPath("key-1.key-2.[0]")
if err != nil {
logger.Fatalf(err.Error())
}
logger.Info(keyPath)
```
### Delete Key By Path
To delete a single key for a given path, e.g. key-2
from the example above, issue
```go
err = state.Delete("key-1.key-2")
if err != nil {
logger.Fatalf(err.Error())
}
```
### Document Management
DBy creates by default an array of documents called library. That is in fact an array of interfaces
When initiating DBy, document 0 (index 0) is creatd by default and any action is done to that document, unless we switch to a new one
#### Add a new doc
To add a new doc, issue
```go
err = state.AddDoc()
if err != nil {
logger.Fatal(err)
}
```
**Note: Adding a new doc also switches the pointer to that doc. Any action will write/read from the new doc by default**
#### Switch Doc
To switch a different document, we can use **Switch** method that takes as an argument an index
For example to switch to doc 1 (second doc), issue
```go
err = state.Switch(1)
if err != nil {
logger.Fatal(err)
}
```
#### Document names
When we work with more than 1 document, we may want to set names in order to easily switch between docs
We have 2 ways to name our documents
- Add a name to each document manually
- Add a name providing a path that exists in all documents
##### Name documents manually
To name a document manually, we can use the **SetName** method which takes 2 arguments
- name
- doc index
For example to name document with index 0, as myDoc
```go
err := state.SetName("myDoc", 0)
if err != nil {
logger.Fatal(err)
}
```
##### Name all documents automatically
To name all documents automatically we need to ensure that the same path exists in all documents.
The method for updating all documents is called **SetNames** and takes 2 arguments
- Prefix: A path in the documents that will be used for the first name
- Suffix: A path in the documents that will be used for the last name
**Note: Docs that do not have the paths that are queried will not get a name**
This method best works with **Kubernetes** manifests, where all docs have a common set of fields.
For example
```yaml
apiVersion: someApi-0
kind: someKind-0
metadata:
...
name: someName-0
...
---
apiVersion: someApi-1
kind: someKind-1
metadata:
...
name: someName-1
...
---
```
From above we could give a name for all our documents if we use **kind** + **metadata.name** for the name.
```go
err := state.SetNames("kind", "metadata.name")
if err != nil {
logger.Fatal(err)
}
```
###### List all doc names
To get the name of all named docs, issue
```go
for i, j := range state.ListDocs() {
fmt.Println(i, j)
}
```
Example output based on the previous **SetNames** example
```bash
0 service/listener-svc
1 poddisruptionbudget/listener-svc
2 horizontalpodautoscaler/caller-svc
3 deployment/caller-svc
4 service/caller-svc
5 poddisruptionbudget/caller-svc
6 horizontalpodautoscaler/listener-svc
7 deployment/listener-svc
```
##### Switch between docs by name
To switch to a doc by using the doc's name, issue
```go
err = state.SwitchDoc("PodDisruptionBudget/caller-svc")
if err != nil {
logger.Fatal(err)
}
```
#### Import Docs
We can import a set of docs with **ImportDocs** method. For example if we have the following yaml
```yaml
apiVersion: someApi-0
kind: someKind-0
metadata:
...
name: someName-0
...
---
apiVersion: someApi-1
kind: someKind-1
metadata:
...
name: someName-1
...
---
```
We can import it by giving the path of the file
```go
err = state.ImportDocs("file-name.yaml")
if err != nil {
logger.Fatal(err)
}
```
#### Global Commands
Wrappers for working with all documents
##### Global Upsert
We can use upsert to update or create keys on all documents
```go
err = state.UpsertGlobal(
"some.path",
"v0.3.0",
)
if err != nil {
logger.Fatal(err)
}
```
##### Global Update
Global update works as **GlobalUpsert** but it skips documents that
miss a path rather than creating the path on those docs.
##### Global GetFirst
To get the value of the first key in the hierarchy for each document, issue
```go
valueOfDocs, err := state.GetFirstGlobal("keyName")
if err != nil {
logger.Fatalf(err.Error())
}
logger.Info(valueOfDocs)
```
This returns a `map[int]interface{}` object. The key is the index of each document and it's value
is the value of the first key in the hierarchy in that document
##### Global FindKeys
To get all the paths for a given from all documents, issue
```go
mapOfPaths, err := state.FindKeysGlobal("keyName")
if err != nil {
logger.Fatalf(err.Error())
}
logger.Info(mapOfPaths)
```
This returns a `map[int][]string` object. The key is the index of each document and it's value
is a list of paths that have the queried key
##### Global GetPath
To get a path that exists in all documents, issue
```go
valueOfDocs, err := state.GetPathGlobal("key-1.key-2.key-3")
if err != nil {
logger.Fatalf(err.Error())
}
logger.Info(valueOfDocs)
```
This returns a `map[int]interface{}` object. The key is the index of each document and it's value
is the value of the specific key in that document
##### Global Delete
To delete a path from all documents, issue
```go
err := state.DeleteGlobal("key-1.key-2.key-3")
if err != nil {
logger.Fatalf(err.Error())
}
```
The above will delete all the paths that match the queried path from each doc
### Convert Utils
Convert simply automate the need to
explicitly do assertion each time we need to access
an interface object.
Let us assume we have the following YAML structure
```yaml
to:
array-1:
key-1:
- key-2: 2
- key-3: 3
- key-4: 4
array-2:
- 1
- 2
- 3
- 4
- 5
array-3:
- key-1: 1
- key-2: 2
```
#### Get map of strings from interface
We can do this in two ways, get object by giving a path and assert the interface to `map[string]string`, or work manually our way to the object
##### Get map directly from a GetPath object
To get map **key-2: 2**, first get object via GetPath
```go
obj, err := state.GetPath("to.array-1.key-1.[0]")
if err != nil {
logger.Fatalf(err.Error())
}
logger.Info(val)
```
Next, assert **obj** as `map[string]string`
```go
assertData := db.NewConvertFactory()
assertData.Input(val)
if assertData.GetError() != nil {
logger.Fatal(assertData.GetError())
}
vMap, err := assertData.GetMap()
if err != nil {
logger.Fatal(err)
}
logger.Info(vMap["key-2"])
```
##### Get map manually
We can get the map manually by using only **Convert** operations
```go
assertData := db.NewConvertFactory()
assertData.Input(state.Data).
Key("to").
Key("array-1").
Key("key-1").Index(0)
if assertData.GetError() != nil {
logger.Fatal(assertData.GetError())
}
vMap, err := assertData.GetMap()
if err != nil {
logger.Fatal(err)
}
logger.Info(vMap["key-2"])
```
#### Get array of string from interface
Again here we can do it two ways as with the map example
##### Get array directly from a GetPath object
To get **array-2** as **[]string**, first get object via GetPath
```go
obj, err = state.GetPath("to.array-2")
if err != nil {
logger.Fatalf(err.Error())
}
logger.Info(obj)
```
Next, assert **obj** as `[]string`
```go
assertData := db.NewConvertFactory()
assertData.Input(obj)
if assertData.GetError() != nil {
logger.Fatal(assertData.GetError())
}
vArray, err := assertData.GetArray()
if err != nil {
logger.Fatal(err)
}
logger.Info(vArray)
```
##### Get array manually
We can get the array manually by using only **Convert** operations
```go
assertData.Input(state.Data).
Key("to").
Key("array-2")
if assertData.GetError() != nil {
logger.Fatal(assertData.GetError())
}
vArray, err := assertData.GetArray()
if err != nil {
logger.Fatal(err)
}
logger.Info(vArray)
```