libkeva

libkeva is a library for keva, a key:value datastore with http json interface.

demo:

package main

import (
	"fmt"
	"time"
	"github.com/donuts-are-good/libkeva"
)

func main() {
	store := libkeva.NewKeyValueStore("data.json", 5*time.Second)

	// Load initial data from file if it exists
	err := store.LoadFromFile("data.json")
	if err != nil {
		fmt.Println("Error loading data from file:", err)
		return
	}

	// Set some key-value pairs
	store.Set("key1", "value1")
	store.Set("key2", "value2")
	store.Set("key3", "value3")

	// Get values
	val1, _ := store.Get("key1")
	val2, _ := store.Get("key2")
	val3, _ := store.Get("key3")

	fmt.Println("Key1:", val1)
	fmt.Println("Key2:", val2)
	fmt.Println("Key3:", val3)

	// Delete a key
	store.Delete("key3")

	val3, exists := store.Get("key3")
	if !exists {
		fmt.Println("Key3 has been deleted")
	} else {
		fmt.Println("Key3:", val3)
	}

	// Let's sleep for a bit to allow any pending saves to complete.
	time.Sleep(5 * time.Second)

	// Reload the data from file to simulate a restart
	newStore := libkeva.NewKeyValueStore("data.json", 5*time.Second)
	err = newStore.LoadFromFile("data.json")
	if err != nil {
		fmt.Println("Error loading data from file:", err)
		return
	}

	// Check if our data is there
	val1, _ = newStore.Get("key1")
	val2, _ = newStore.Get("key2")

	fmt.Println("After reloading from file:")
	fmt.Println("Key1:", val1)
	fmt.Println("Key2:", val2)
}

1. store a key-value:

curl -x post http://localhost:8080/store/demokey -h "content-type: application/json" -d '{"value": "demo value"}'

output:

ok

2. retrieve a stored value:

curl -x get http://localhost:8080/store/demokey

output:

"demo value"

3. delete a stored key:

curl -x delete http://localhost:8080/store/demokey

output:

ok

4. try retrieving a deleted key:

curl -x get http://localhost:8080/store/demokey

output:

key not found

5. health check:

curl -x get http://localhost:8080/health

output:

healthy

endpoints:

1. get /store/{key}

description: retrieve a value by the given key.

parameters:

• key: the key associated with the stored value.

response:

• 200 ok: value retrieved successfully. it returns the stored value in json format.
• 404 not found: key not found.

example:

curl -x get http://localhost:8080/store/examplekey

---

2. post /store/{key}

description: store a value associated with the given key.

parameters:

• key: the key to store the value with.

request body: json object containing the value to store.

• value (string): the value to be stored.

response:

• 201 created: key-value set successfully.
• 400 bad request: no value provided or bad request format.

example:

curl -x post http://localhost:8080/store/examplekey -h "content-type: application/json" -d '{"value": "this is an example value"}'

---

3. delete /store/{key}

description: delete the value associated with the given key.

parameters:

• key: the key of the value to delete.

response:

• 200 ok: key deleted successfully.
• 404 not found: key not found.

example:

curl -x delete http://localhost:8080/store/examplekey

---

4. get /health

description: health check endpoint.

response:

• 200 ok: healthy.

example:

curl -x get http://localhost:8080/health

errors:

the api uses conventional http response codes to indicate the success or failure of an api request.

• 200 ok: the request was successful.
• 201 created: the request was successful and a resource was created.
• 400 bad request: the request could not be understood or was missing required parameters.
• 404 not found: resource not found. this can be used when a specific key does not exist in the store.
• 405 method not allowed: the http method used is not valid for the specific endpoint.

license

mit license 2023 donuts-are-good, for more info see license.md