Implement executing queries using API

api/handlers/documents.go

@@ -77,10 +77,17 @@ func DocumentsPost(c *gin.Context) {
 		}
 
 		// TODO: Handle these {"query":"select c.id, c._self, c._rid, c._ts, [c[\"pk\"]] as _partitionKeyValue from c"}
+		docs, status := repositories.ExecuteQueryDocuments(databaseId, collectionId, query.(string))
+		if status != repositories.StatusOk {
+			// TODO: Currently we return everything if the query fails
 			GetAllDocuments(c)
 			return
 		}
 
+		c.IndentedJSON(http.StatusOK, gin.H{"_rid": "", "Documents": docs, "_count": len(docs)})
+		return
+	}
+
 	if requestBody["id"] == "" {
 		c.JSON(http.StatusBadRequest, gin.H{"message": "BadRequest"})
 		return

api/tests/documents_test.go

@@ -0,0 +1,89 @@
+package tests_test
+
+import (
+	"context"
+	"encoding/json"
+	"fmt"
+	"reflect"
+	"testing"
+
+	"github.com/Azure/azure-sdk-for-go/sdk/data/azcosmos"
+	"github.com/pikami/cosmium/internal/repositories"
+	"github.com/stretchr/testify/assert"
+)
+
+func testCosmosQuery(t *testing.T, collectionClient *azcosmos.ContainerClient, query string, expectedData []map[string]interface{}) {
+	pager := collectionClient.NewQueryItemsPager(
+		query,
+		azcosmos.PartitionKey{},
+		&azcosmos.QueryOptions{})
+
+	context := context.TODO()
+	items := make([]map[string]interface{}, 0)
+
+	for pager.More() {
+		response, err := pager.NextPage(context)
+		assert.Nil(t, err)
+
+		for _, bytes := range response.Items {
+			var item map[string]interface{}
+			err := json.Unmarshal(bytes, &item)
+			assert.Nil(t, err)
+
+			items = append(items, item)
+		}
+	}
+
+	assert.Equal(t, len(expectedData), len(items))
+	if !reflect.DeepEqual(items, expectedData) {
+		t.Errorf("executed query does not match expected data.\nExpected: %+v\nGot: %+v", expectedData, items)
+	}
+}
+
+func Test_Documents(t *testing.T) {
+	repositories.CreateCollection(testDatabaseName, repositories.Collection{
+		ID: testCollectionName,
+		PartitionKey: struct {
+			Paths   []string "json:\"paths\""
+			Kind    string   "json:\"kind\""
+			Version int      "json:\"Version\""
+		}{
+			Paths: []string{"/pk"},
+		},
+	})
+	repositories.CreateDocument(testDatabaseName, testCollectionName, map[string]interface{}{"id": "12345", "pk": "123", "isCool": false})
+	repositories.CreateDocument(testDatabaseName, testCollectionName, map[string]interface{}{"id": "67890", "pk": "456", "isCool": true})
+
+	ts := runTestServer()
+	defer ts.Close()
+
+	client, err := azcosmos.NewClientFromConnectionString(
+		fmt.Sprintf("AccountEndpoint=%s;AccountKey=%s", ts.URL, "asas"),
+		&azcosmos.ClientOptions{},
+	)
+	assert.Nil(t, err)
+
+	collectionClient, err := client.NewContainer(testDatabaseName, testCollectionName)
+	assert.Nil(t, err)
+
+	t.Run("Should query document", func(t *testing.T) {
+		testCosmosQuery(t, collectionClient,
+			"SELECT c.id, c[\"pk\"] FROM c",
+			[]map[string]interface{}{
+				{"id": "12345", "pk": "123"},
+				{"id": "67890", "pk": "456"},
+			},
+		)
+	})
+
+	t.Run("Should query document with single WHERE condition", func(t *testing.T) {
+		testCosmosQuery(t, collectionClient,
+			`select c.id
+			FROM c
+			WHERE c.isCool=true`,
+			[]map[string]interface{}{
+				{"id": "67890"},
+			},
+		)
+	})
+}

internal/repositories/documents.go

@@ -1,6 +1,13 @@
 package repositories
 
-import "strings"
+import (
+	"log"
+	"strings"
+
+	"github.com/pikami/cosmium/parsers"
+	"github.com/pikami/cosmium/parsers/nosql"
+	memoryexecutor "github.com/pikami/cosmium/query_executors/memory_executor"
+)
 
 var documents = []Document{}
 
@@ -76,6 +83,12 @@ func CreateDocument(databaseId string, collectionId string, document map[string]
 		for _, part := range strings.Split(path, "/") {
 			val = document[part]
 		}
+
+		if val == nil {
+			val = ""
+		}
+
+		// TODO: handle non-string partition keys
 		partitionKeyValue = append(partitionKeyValue, val.(string))
 	}
 
@@ -88,3 +101,23 @@ func CreateDocument(databaseId string, collectionId string, document map[string]
 
 	return StatusOk
 }
+
+func ExecuteQueryDocuments(databaseId string, collectionId string, query string) ([]memoryexecutor.RowType, RepositoryStatus) {
+	parsedQuery, err := nosql.Parse("", []byte(query))
+	if err != nil {
+		log.Printf("Failed to parse query: %s\nerr: %v", query, err)
+		return nil, BadRequest
+	}
+
+	collectionDocuments, status := GetAllDocuments(databaseId, collectionId)
+	if status != StatusOk {
+		return nil, status
+	}
+
+	covDocs := make([]memoryexecutor.RowType, 0)
+	for _, doc := range collectionDocuments {
+		covDocs = append(covDocs, map[string]interface{}(doc))
+	}
+
+	return memoryexecutor.Execute(parsedQuery.(parsers.SelectStmt), covDocs), StatusOk
+}

parsers/nosql/nosql_test.go

@@ -52,7 +52,7 @@ func Test_Parse(t *testing.T) {
 		)
 	})
 
-	t.Run("Shoul parse SELECT with single WHERE condition", func(t *testing.T) {
+	t.Run("Should parse SELECT with single WHERE condition", func(t *testing.T) {
 		testQueryParse(
 			t,
 			`select c.id

query_executors/memory_executor/memory_executor.go

@@ -8,7 +8,7 @@ type RowType interface{}
 type ExpressionType interface{}
 
 func Execute(query parsers.SelectStmt, data []RowType) []RowType {
-	var result []RowType
+	result := make([]RowType, 0)
 
 	// Iterate over each row in the data
 	for _, row := range data {

query_executors/memory_executor/memory_executor_test.go

@@ -17,7 +17,7 @@ func testQueryExecute(
 	result := memoryexecutor.Execute(query, data)
 
 	if !reflect.DeepEqual(result, expectedData) {
-		t.Errorf("parsed query does not match expected structure.\nExpected: %+v\nGot: %+v", expectedData, result)
+		t.Errorf("execution result does not match expected data.\nExpected: %+v\nGot: %+v", expectedData, result)
 	}
 }