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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,52 @@ | ||
| package config | ||
|
|
||
| import ( | ||
| "fmt" | ||
| "github.com/artie-labs/reader/constants" | ||
| "github.com/artie-labs/transfer/lib/stringutil" | ||
| ) | ||
|
|
||
| type MongoDB struct { | ||
| Host string `yaml:"host"` | ||
| Username string `yaml:"username"` | ||
| Password string `yaml:"password"` | ||
| Database string `yaml:"database"` | ||
|
|
||
| Collections []Collection `yaml:"collections"` | ||
| } | ||
|
|
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| type Collection struct { | ||
| Name string `yaml:"name"` | ||
| BatchSize int32 `yaml:"batchSize,omitempty"` | ||
| // TODO: In the future, we should be able to support customers passing Start/End PK values. | ||
| } | ||
|
|
||
| func (c Collection) TopicSuffix(db string) string { | ||
| return fmt.Sprintf("%s.%s", db, c.Name) | ||
| } | ||
|
|
||
| func (c Collection) GetBatchSize() int32 { | ||
| if c.BatchSize == 0 { | ||
| return constants.DefaultBatchSize | ||
| } | ||
|
|
||
| return c.BatchSize | ||
| } | ||
|
|
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| func (m MongoDB) Validate() error { | ||
| if stringutil.Empty(m.Host, m.Database, m.Username, m.Password) { | ||
| return fmt.Errorf("one of the MongoDB settings is empty: host, username, password, database") | ||
| } | ||
|
|
||
| if len(m.Collections) == 0 { | ||
| return fmt.Errorf("no collections passed in") | ||
| } | ||
|
|
||
| for _, collection := range m.Collections { | ||
| if collection.Name == "" { | ||
| return fmt.Errorf("collection name must be passed in") | ||
| } | ||
| } | ||
|
|
||
| return nil | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,13 @@ | ||
| source: mongodb | ||
| mongodb: | ||
| host: mongodb://localhost:27017 | ||
| username: foo | ||
| password: bar | ||
| database: myFirstDatabase | ||
| collections: | ||
| - name: customers | ||
| batchSize: 1 | ||
| kafka: | ||
| bootstrapServers: localhost:29092 | ||
| topicPrefix: dbserver1 | ||
| maxRequestSize: 4194304 |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,82 @@ | ||
| package mongo | ||
|
|
||
| import ( | ||
| "context" | ||
| "fmt" | ||
| "github.com/artie-labs/reader/config" | ||
| "github.com/artie-labs/reader/lib" | ||
| "go.mongodb.org/mongo-driver/bson" | ||
| "go.mongodb.org/mongo-driver/mongo" | ||
| "go.mongodb.org/mongo-driver/mongo/options" | ||
| ) | ||
|
|
||
| type collectionScanner struct { | ||
| db *mongo.Database | ||
| cfg config.MongoDB | ||
| collection config.Collection | ||
|
|
||
| // mutable | ||
| cursor *mongo.Cursor | ||
| done bool | ||
| } | ||
|
|
||
| func newIterator(db *mongo.Database, collection config.Collection, cfg config.MongoDB) *collectionScanner { | ||
| return &collectionScanner{ | ||
| db: db, | ||
| cfg: cfg, | ||
| collection: collection, | ||
| } | ||
| } | ||
|
|
||
| func (c *collectionScanner) HasNext() bool { | ||
| return !c.done | ||
| } | ||
|
|
||
| func (c *collectionScanner) Next() ([]lib.RawMessage, error) { | ||
| if !c.HasNext() { | ||
| return nil, fmt.Errorf("no more rows to scan") | ||
| } | ||
|
|
||
| ctx := context.Background() | ||
| if c.cursor == nil { | ||
| findOptions := options.Find() | ||
| findOptions.SetBatchSize(c.collection.GetBatchSize()) | ||
| cursor, err := c.db.Collection(c.collection.Name).Find(ctx, bson.D{}, findOptions) | ||
| if err != nil { | ||
| return nil, fmt.Errorf("failed to find documents: %w", err) | ||
| } | ||
|
|
||
| c.cursor = cursor | ||
| } | ||
|
|
||
| var rawMsgs []lib.RawMessage | ||
| for c.collection.GetBatchSize() > int32(len(rawMsgs)) && c.cursor.Next(ctx) { | ||
| var result bson.M | ||
| if err := c.cursor.Decode(&result); err != nil { | ||
| return nil, fmt.Errorf("failed to decode document: %w", err) | ||
| } | ||
|
|
||
| mgoMsg, err := parseMessage(result) | ||
| if err != nil { | ||
| return nil, fmt.Errorf("failed to parse message: %w", err) | ||
| } | ||
|
|
||
| rawMsg, err := mgoMsg.toRawMessage(c.collection, c.cfg.Database) | ||
| if err != nil { | ||
| return nil, fmt.Errorf("failed to create raw message: %w", err) | ||
| } | ||
|
|
||
| rawMsgs = append(rawMsgs, rawMsg) | ||
| } | ||
|
|
||
| if err := c.cursor.Err(); err != nil { | ||
| return nil, fmt.Errorf("failed to iterate over documents: %w", err) | ||
| } | ||
|
|
||
| // If the number of fetched documents is less than the batch size, we are done | ||
| if c.collection.GetBatchSize() > int32(len(rawMsgs)) { | ||
| c.done = true | ||
| } | ||
|
|
||
| return rawMsgs, nil | ||
| } |
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