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🔥 feat: Add support for Neo4j #1562
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WalkthroughThis pull request introduces a new Neo4j storage driver implementation along with minor documentation and configuration updates. Key changes include the addition of a comprehensive README for the Neo4j driver, the creation of configuration and implementation files, and the development of a test suite. Additionally, a small optimization was made to the Postgres configuration function by removing a redundant check. The ArangoDB README was also slightly modified to correct a reference. Changes
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Actionable comments posted: 4
🧹 Nitpick comments (10)
neo4j/neo4j.go (2)
116-116
: Validate the use ofutils.UnsafeBytes()
.
While it efficiently converts strings to byte slices, changes to the underlying string might lead to unexpected behavior or data races in concurrent settings. Verify that it’s safe for your use case.
172-175
: Ensure goroutine shutdown before closing the Neo4j driver.
Closing the driver immediately after signalings.done
could lead to a race if thegcTicker
goroutine attempts to execute Cypher queries at the same time. Consider waiting for the goroutine to complete if you need strict ordering.neo4j/config.go (1)
51-54
: Clarify documentation for theReset
field.
The comment references “existing Table” rather than the node name. Consider updating to reference the actual entity in Neo4j for consistency.-// Reset clears any existing keys in existing Table +// Reset clears any existing nodes in the Neo4j database node.neo4j/neo4j_test.go (2)
64-65
: Use duration-based constants to improve test stability.
Relying on 1100ms might lead to flaky tests. A small buffer aboveexp
improves reliability in CI environments with variable performance.time.Sleep(1100 * time.Millisecond) +time.Sleep(exp + 200*time.Millisecond)
119-121
: Reevaluate test data for non-UTF8 validation.
"0xF5"
is a valid ASCII sequence, so it may not fully test non-UTF8 handling. If genuine binary data is expected, consider using truly non-UTF8 byte patterns.neo4j/README.md (5)
6-8
: Enhance version information clarity.Consider adding more specific version details:
- Specify the minimum supported version of the neo4j-go-driver.
- Include the exact minimum Go version (e.g., "Requires Go 1.20.0 and above").
20-28
: Add method descriptions and error types.Consider enhancing the signatures section with:
- Brief descriptions of each method's purpose
- Specific error types that each method can return
- Example usage for complex methods
Example format:
// Get retrieves a value by key from the storage // Returns: value ([]byte), ErrNotFound or other storage-specific errors func (s *Storage) Get(key string) ([]byte, error)
54-65
: Expand examples section with common use cases.Consider adding examples for:
- Error handling
- Basic CRUD operations (Get/Set/Delete)
- Authentication setup
- Connection with TLS
- Working with expiration times
Example:
// Example with error handling and basic operations store := neo4jstore.New(config) defer store.Close() // Set with expiration if err := store.Set("key", []byte("value"), 1*time.Hour); err != nil { log.Fatal(err) } // Get with error handling value, err := store.Get("key") if err != nil { if errors.Is(err, neo4jstore.ErrNotFound) { // Handle not found } log.Fatal(err) }
123-134
: Enhance security documentation in authentication section.Consider adding:
- Security best practices for authentication
- Warning about storing credentials in code
- Environment variables usage example
- TLS/SSL configuration recommendations
Example addition:
#### Security Best Practices - Use environment variables for credentials - Enable TLS for production environments - Implement proper credential rotation - Use least privilege principle when setting up database users Example using environment variables: ```go store := neo4jstore.New(neo4jstore.Config{ Username: os.Getenv("NEO4J_USER"), Password: os.Getenv("NEO4J_PASS"), })🧰 Tools
🪛 LanguageTool
[grammar] ~129-~129: Two determiners in a row. Choose either “the” or “this”.
Context: ... andPassword
fields: This will cause the this storage driver to use Basic Auth. Othe...(DT_DT)
140-145
: Add production configuration guidance.Consider adding a note about production-ready configuration, including:
- Recommended GCInterval for different workloads
- Production-appropriate TargetBoltURI format
- Node naming best practices
- Performance implications of Reset flag
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🪛 LanguageTool
neo4j/README.md
[grammar] ~129-~129: Two determiners in a row. Choose either “the” or “this”.
Context: ... and Password
fields: This will cause the this storage driver to use Basic Auth. Othe...
(DT_DT)
🪛 golangci-lint (1.62.2)
neo4j/neo4j.go
204-204: Error return value of json.Unmarshal
is not checked
(errcheck)
🔇 Additional comments (2)
neo4j/neo4j.go (1)
55-60
: Double-check the “FINISH” keyword in Cypher queries.
Standard Neo4j Cypher does not typically use aFINISH
clause. Confirm that this syntax is valid/executable in your environment or remove it if unnecessary.Also applies to: 75-78
neo4j/config.go (1)
85-91
: Validate partial credentials.
Currently, if only Username or Password is provided (not both),neo4j.BasicAuth
is not invoked. If partial credentials are unintended or invalid, consider handling that case or clarifying it in the documentation.
thx |
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Actionable comments posted: 3
🧹 Nitpick comments (2)
neo4j/README.md (1)
59-64
: Enhance custom configuration example.Consider expanding the example to demonstrate authentication setup, which is a crucial aspect of Neo4j configuration. This would help users understand how to properly set up authentication using the available options (DB, Auth, or Username/Password).
store := neo4jstore.New(neo4jstore.Config{ DB: driver, Node: "fiber_storage", Reset: false, GCInterval: 10 * time.Second, + // Authentication example: + Username: "neo4j", + Password: "password", + // Or using Auth: + // Auth: neo4j.BasicAuth("neo4j", "password", ""), })neo4j/neo4j.go (1)
197-199
: Consider logging garbage collection errors.While it's acceptable for GC to fail silently, logging errors could help with debugging issues.
func (s *Storage) gc(t time.Time) { - _, _ = neo4j.ExecuteQuery(context.Background(), s.db, s.cypherGC, map[string]any{"exp": t.Unix()}, neo4j.EagerResultTransformer) + if _, err := neo4j.ExecuteQuery(context.Background(), s.db, s.cypherGC, map[string]any{"exp": t.Unix()}, neo4j.EagerResultTransformer); err != nil { + // Use your preferred logging mechanism + fmt.Printf("neo4j gc error: %v\n", err) + } }
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(1 hunks)neo4j/neo4j.go
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📓 Learnings (1)
neo4j/neo4j.go (1)
Learnt from: the-real-i9
PR: gofiber/storage#1562
File: neo4j/neo4j.go:101-101
Timestamp: 2025-01-30T11:50:03.517Z
Learning: In Neo4j Cypher queries, using `OPTIONAL MATCH` ensures at least one record is always returned, with unmatched patterns resulting in null values. This makes additional length checks on the records array unnecessary when combined with proper null checking.
🔇 Additional comments (3)
neo4j/README.md (2)
38-38
: Fix typo in installation instructions."noe4j" should be "neo4j".
70-120
: LGTM! Well-documented configuration options.The Config struct documentation clearly explains all available options and their defaults.
neo4j/neo4j.go (1)
85-117
: LGTM! Proper implementation of Get method.The implementation correctly uses OPTIONAL MATCH and handles null values appropriately, ensuring safe record access.
Oh! Wait. I'm yet to write the github workflow yaml file and update the READMEs |
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Actionable comments posted: 0
🧹 Nitpick comments (1)
README.md (1)
70-70
: LGTM! Consider adding alt text to the workflow badge.The Neo4j entry follows the consistent format and structure of other storage implementations. However, for better accessibility:
Add alt text to the workflow badge image:
-- [Neo4j](./neo4j/README.md) <a href="https://github.com/gofiber/storage/actions?query=workflow%3A%22Tests+Neo4j%22"> <img src="https://img.shields.io/github/actions/workflow/status/gofiber/storage/test-neo4j.yml?branch=main&label=%F0%9F%A7%AA%20&style=flat&color=75C46B" /> </a> ++ [Neo4j](./neo4j/README.md) <a href="https://github.com/gofiber/storage/actions?query=workflow%3A%22Tests+Neo4j%22"> <img alt="Neo4j Tests Status" src="https://img.shields.io/github/actions/workflow/status/gofiber/storage/test-neo4j.yml?branch=main&label=%F0%9F%A7%AA%20&style=flat&color=75C46B" /> </a>🧰 Tools
🪛 markdownlint-cli2 (0.17.2)
70-70: Images should have alternate text (alt text)
null(MD045, no-alt-text)
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README.md
70-70: Images should have alternate text (alt text)
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@gaby Done. - [Neo4j](./neo4j/README.md) <a href="https://github.com/gofiber/storage/actions?query=workflow%3A%22Tests+Neo4j%22"> <img src="https://img.shields.io/github/actions/workflow/status/gofiber/storage/test-neo4j.yml?branch=main&label=%F0%9F%A7%AA%20&style=flat&color=75C46B" /> </a> I can see the tag beside it now. It should change from "no status" after this pull request is merged. |
@gaby Thanks for this opportunity. And this conversation. |
Will review today, thanks! |
neo4j/config.go
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@@ -0,0 +1,102 @@ | |||
package neo4jstore |
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@the-real-i9 I was looking at the other drivers and this can be named neo4j
. For example our redis one is named package redis
same as the upstream one and it doesn't collide.
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Minor thing, overall looks good.
|
||
// Start a Neo4j test container | ||
neo4jContainer, err := neo4j.Run(ctx, | ||
"neo4j:5.26", |
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Move this to a const
outside this function. That way it's easier to find/update in the future.
@gaby Now I get it. It's ok to panic during initializations where the server is yet to start. But never in the code where the server has already started, and users are already sending requests. I've been trying to get a clear understanding of where to panic and where not to. Thanks! |
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Actionable comments posted: 0
🧹 Nitpick comments (1)
neo4j/neo4j_test.go (1)
106-127
: Improve test reliability by adding pre-expiration check.While the test is functionally correct, it could be more reliable by verifying the value exists before expiration.
Apply this diff to improve test reliability:
err := testStore.Set(key, val, exp) require.NoError(t, err) +// Verify value exists before expiration +result, err := testStore.Get(key) +require.NoError(t, err) +require.Equal(t, val, result) + time.Sleep(200 * time.Millisecond) result, err := testStore.Get(key)
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- neo4j/config.go
🧰 Additional context used
📓 Learnings (1)
neo4j/neo4j.go (6)
Learnt from: gaby
PR: gofiber/storage#1562
File: neo4j/neo4j.go:221-221
Timestamp: 2025-02-02T23:41:30.921Z
Learning: In the Neo4j storage implementation, the `mapToStruct` function should return an error instead of panicking when JSON unmarshaling fails to prevent server crashes.
Learnt from: the-real-i9
PR: gofiber/storage#1562
File: neo4j/neo4j.go:50-52
Timestamp: 2025-01-30T12:29:41.774Z
Learning: Storage drivers in the gofiber/storage repository intentionally panic on connection errors as a design choice to fail fast when storage is unavailable.
Learnt from: the-real-i9
PR: gofiber/storage#1562
File: neo4j/neo4j.go:50-52
Timestamp: 2025-01-30T12:29:41.774Z
Learning: In the Neo4j storage driver initialization, connectivity verification errors are considered unexpected according to the maintainer.
Learnt from: the-real-i9
PR: gofiber/storage#1562
File: neo4j/neo4j.go:44-45
Timestamp: 2025-01-30T12:32:54.196Z
Learning: In the Neo4j storage driver, connection errors are handled by panicking during connectivity verification, making additional error logging redundant.
Learnt from: the-real-i9
PR: gofiber/storage#1562
File: neo4j/neo4j.go:44-45
Timestamp: 2025-01-30T12:32:54.196Z
Learning: In the Neo4j storage driver, connection errors are handled through `VerifyConnectivity` which panics on failure, making additional error logging at connection creation time redundant.
Learnt from: the-real-i9
PR: gofiber/storage#1562
File: neo4j/neo4j.go:101-101
Timestamp: 2025-01-30T11:50:03.517Z
Learning: In Neo4j Cypher queries, using `OPTIONAL MATCH` ensures at least one record is always returned, with unmatched patterns resulting in null values. This makes additional length checks on the records array unnecessary when combined with proper null checking.
🔇 Additional comments (22)
neo4j/neo4j.go (10)
40-42
: LGTM!The function correctly creates a new driver with context and properly handles error propagation.
44-98
: LGTM!The function correctly:
- Initializes a new storage instance
- Creates an index for better query performance
- Starts a garbage collection ticker
- Follows the design choice of panicking on connection errors
100-136
: LGTM!The function correctly:
- Handles empty keys
- Handles expired values
- Handles non-existent values
- Handles JSON unmarshaling errors
138-164
: LGTM!The function correctly:
- Handles empty keys and values
- Handles expiration time
- Handles error propagation
166-174
: LGTM!The function correctly:
- Handles empty keys
- Handles error propagation
176-185
: LGTM!The function correctly:
- Executes the reset query
- Handles error propagation
187-192
: LGTM!The function correctly:
- Signals the gc ticker to stop
- Closes the database connection
194-197
: LGTM!The function correctly returns the database client.
199-211
: LGTM!The function correctly:
- Starts a ticker
- Handles cleanup
- Handles shutdown signal
213-216
: LGTM!The function correctly:
- Executes the gc query
- Ignores errors as this is a background task
neo4j/neo4j_test.go (12)
15-49
: LGTM!The function correctly:
- Starts a Neo4j test container
- Handles container termination errors
- Initializes the store
51-65
: LGTM!The function correctly:
- Uses t.Parallel() for concurrent test execution
- Uses t.Cleanup() for proper cleanup
- Tests setting a key-value pair
67-84
: LGTM!The function correctly:
- Uses t.Parallel() for concurrent test execution
- Uses t.Cleanup() for proper cleanup
- Tests upserting a key-value pair
86-104
: LGTM!The function correctly:
- Uses t.Parallel() for concurrent test execution
- Uses t.Cleanup() for proper cleanup
- Tests getting a key-value pair
129-141
: LGTM!The function correctly:
- Uses t.Parallel() for concurrent test execution
- Uses t.Cleanup() for proper cleanup
- Tests getting an expired key
143-153
: LGTM!The function correctly:
- Uses t.Parallel() for concurrent test execution
- Uses t.Cleanup() for proper cleanup
- Tests getting a non-existent key
155-176
: LGTM!The function correctly:
- Uses t.Parallel() for concurrent test execution
- Uses t.Cleanup() for proper cleanup
- Tests deleting a key
178-203
: LGTM!The function correctly:
- Uses t.Parallel() for concurrent test execution
- Uses t.Cleanup() for proper cleanup
- Tests resetting all keys
205-220
: LGTM!The function correctly:
- Uses t.Parallel() for concurrent test execution
- Uses t.Cleanup() for proper cleanup
- Tests non-UTF8 values
222-230
: LGTM!The function correctly:
- Uses t.Parallel() for concurrent test execution
- Uses t.Cleanup() for proper cleanup
- Tests closing the store
232-239
: LGTM!The function correctly:
- Uses t.Parallel() for concurrent test execution
- Uses t.Cleanup() for proper cleanup
- Tests getting the connection
241-290
: 🛠️ Refactor suggestionCheck error from Set in SetAndDelete benchmark.
The benchmark ignores the error from Set operation, which could mask issues.
Apply this diff to improve error handling:
var err error for i := 0; i < b.N; i++ { - _ = testStore.Set("john", []byte("doe"), 0) + err = testStore.Set("john", []byte("doe"), 0) + require.NoError(b, err) err = testStore.Delete("john") }Likely invalid or redundant comment.
@mdelapenya [UPDATE]: [UPDATE]: |
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Actionable comments posted: 0
♻️ Duplicate comments (2)
neo4j/neo4j_test.go (2)
94-109
: 🛠️ Refactor suggestionStrengthen expiration test reliability.
The current expiration test could be flaky and doesn't verify the actual expiration process.
func Test_Neo4jStore_Set_Expiration(t *testing.T) { + t.Parallel() var ( key = "john" val = []byte("doe") exp = 100 * time.Millisecond ) err := testStore.Set(key, val, exp) require.NoError(t, err) + // Verify value exists before expiration + result, err := testStore.Get(key) + require.NoError(t, err) + require.Equal(t, val, result) + + // Wait for expiration with a small buffer time.Sleep(200 * time.Millisecond) - result, err := testStore.Get(key) + result, err = testStore.Get(key) require.NoError(t, err) require.Zero(t, len(result)) }
208-219
:⚠️ Potential issueFix error handling in SetAndDelete benchmark.
The Set operation error is ignored, which could mask issues.
func Benchmark_Neo4jStore_SetAndDelete(b *testing.B) { b.ReportAllocs() b.ResetTimer() var err error for i := 0; i < b.N; i++ { - _ = testStore.Set("john", []byte("doe"), 0) + err = testStore.Set("john", []byte("doe"), 0) + require.NoError(b, err) err = testStore.Delete("john") } require.NoError(b, err) }
🧹 Nitpick comments (1)
neo4j/neo4j_test.go (1)
182-219
: Add more comprehensive benchmark scenarios.The current benchmarks cover basic operations. Consider adding more complex scenarios to better understand performance characteristics.
Suggested additional benchmarks:
- Concurrent operations
- Batch operations
- Operations with varying key/value sizes
- Operations with expiration
Example:
func Benchmark_Neo4jStore_ConcurrentSet(b *testing.B) { b.ReportAllocs() b.ResetTimer() b.RunParallel(func(pb *testing.PB) { for pb.Next() { err := testStore.Set("john", []byte("doe"), 0) require.NoError(b, err) } }) } func Benchmark_Neo4jStore_BatchSet(b *testing.B) { b.ReportAllocs() keys := make([]string, 100) vals := make([][]byte, 100) for i := 0; i < 100; i++ { keys[i] = fmt.Sprintf("key%d", i) vals[i] = []byte(fmt.Sprintf("val%d", i)) } b.ResetTimer() for i := 0; i < b.N; i++ { for j := 0; j < 100; j++ { err := testStore.Set(keys[j], vals[j], 0) require.NoError(b, err) } } }
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🔇 Additional comments (2)
neo4j/neo4j_test.go (2)
21-24
: Move container configuration to constants.The container version and credentials should be defined as package-level constants for easier maintenance and reusability.
+const ( + neo4jVersion = "neo4j:5.26" + neo4jAdminPasswd = "pass#w*#d" +) func TestMain(m *testing.M) { ctx := context.Background() // Start a Neo4j test container neo4jContainer, err := neo4j.Run(ctx, - "neo4j:5.26", - neo4j.WithAdminPassword("pass#w*#d"), + neo4jVersion, + neo4j.WithAdminPassword(neo4jAdminPasswd), )
16-55
: Consider per-test container setup for parallel execution.Instead of using TestMain, consider creating a helper function that sets up a Neo4j container for each test. This would allow for parallel test execution and better isolation.
Here's a suggested approach:
func setupTestStore(t *testing.T) (*Storage, func()) { t.Helper() ctx := context.Background() neo4jContainer, err := neo4j.Run(ctx, neo4jVersion, neo4j.WithAdminPassword(neo4jAdminPasswd), ) require.NoError(t, err) uri, err := neo4jContainer.BoltUrl(ctx) require.NoError(t, err) store := New(Config{ Reset: true, URI: uri, Username: "neo4j", Password: neo4jAdminPasswd, }) cleanup := func() { store.Close() if err := neo4jContainer.Terminate(ctx); err != nil { t.Logf("Failed to terminate Neo4j container: %v", err) } } return store, cleanup } // Usage in tests: func Test_Neo4jStore_Set(t *testing.T) { t.Parallel() store, cleanup := setupTestStore(t) defer cleanup() // ... test logic }
@mdelapenya With a single container in |
@gaby I've addressed all the reviews. Thanks. The PR has been updated. |
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LGTM
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Actionable comments posted: 1
🧹 Nitpick comments (1)
neo4j/README.md (1)
52-65
: Initialization Examples EvaluationThe dual examples demonstrate both default and custom configurations effectively. For the custom configuration example, consider clarifying what the
driver
variable refers to (e.g., mention that it should be an initializedneo4j.DriverWithContext
instance) to help users understand the context.
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neo4j/README.md
[grammar] ~8-~8: After the number ‘two’, use a plural noun. Did you mean “releases”?
Context: ...driver). > Note: Requires latest two release of Golang ### Table of Contents - [...
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- GitHub Check: compare (neo4j)
🔇 Additional comments (8)
neo4j/README.md (8)
1-4
: YAML Front Matter ValidationThe YAML front matter is concise, clear, and correctly declares the document's identity and title for Neo4j.
10-17
: Table of Contents ClarityThe Table of Contents is well structured and easy to navigate. Just ensure the links remain updated with any future additions or adjustments.
18-29
: Public API Signatures OverviewThe signatures listed for the public API (including
New
,Get
,Set
,Delete
,Reset
,Close
, andConn
) are clearly presented. This gives users a comprehensive view of the supported methods.
30-42
: Installation Instructions ReviewThe Installation section provides clear instructions for initializing a Go module and installing the Neo4j storage driver. Consider updating the placeholder
github.com/<user>/<repo>
with a note indicating that users should replace it with their actual repository.
44-50
: Import Statement ExampleThe example for importing the Neo4j storage package is concise and correct. This snippet should help users integrate the package without confusion.
67-121
: Configuration Struct DocumentationThe configuration struct and its associated comments are thorough and clear. Each field is well explained, and default values are documented, aiding in usability and maintenance.
123-134
: Authentication Note DetailsThe authentication section clearly explains the three prioritized methods for providing credentials. The instructions are helpful in avoiding misconfigurations. It might be beneficial to emphasize that if authentication is not needed, leaving the fields empty is acceptable.
135-147
: Default Configuration Block AccuracyThe default configuration block is correctly defined and aligns with the configuration struct. It provides sensible defaults for a basic Neo4j setup. Make sure to update these defaults if the implementation changes in the future.
|
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A Neo4j storage driver using [neo4j/neo4j-go-driver](https://github.com/neo4j/neo4j-go-driver). | ||
|
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> **Note: Requires latest two release of Golang** |
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🛠️ Refactor suggestion
Grammar Correction for Go Version Note
The note currently reads "Requires latest two release of Golang." Please update it to "Requires latest two releases of Golang" to correct the pluralization.
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[grammar] ~8-~8: After the number ‘two’, use a plural noun. Did you mean “releases”?
Context: ...driver). > Note: Requires latest two release of Golang ### Table of Contents - [...
(CD_NNU)
@the-real-i9 Thank you 💪 |
@gaby @ReneWerner87 🙏 It's an honour to be a part of this. |
Neo4j storage driver: Configuration declaration (config.go), Storage implementation (neo4j.go), Tests (neo4j_test.go), and a README.md
arangodb/README.md: typo fix: I think the author meant arangodb, but mistakenly typed mysql
postgres/config.go: removed duplicate
cfg.Table == ""
condition checkfixes #1561
Summary by CodeRabbit
Summary by CodeRabbit
Documentation
New Features
Bug Fixes
Tests