MongoDB binding for R6RS

This is an R6RS Scheme implementation of MongoDB wire protocol.

How to use

The most of users should use only (mongodb) library which contains MongoDB connection, database and CRUD operations. The following piece of code shows the simple CRUD operation with this library:

(import (rnrs)
        (mongodb))

(define connection 
  (open-mongodb-connection! (make-mongodb-connection "localhost")))
(define database (make-mongodb-database connection "test"))

(define collection "testCollection")

(mongodb-database-insert database collection
  '#(
     (("id" 1) ("name" "R6RS MongoDB library") ("lang" "Scheme")))
     )
(mongodb-database-upsert database collection
  '(("name" "R7RS PostgreSQL library"))
  '(("$set"
     (("id" 2) ("name" "R7RS PostgreSQL library") ("lang" "Scheme")))))

(mongodb-database-update database collection
  '(("id" 1))
  '(("$set" (("lang" "R6RS Scheme")))))
(mongodb-database-update-all database collection
  '(("id" (("$gt" 0))))
  '(("$set" (("comment" "Portable Scheme library")))))

(mongodb-query-for-each (lambda (doc) (write doc) (newline))
  (mongodb-database-query database collection '()))

(mongodb-database-delete-all database collection '())

(display
 (mongodb-query-result-documents
  (mongodb-database-query database collection '()))) (newline)

(close-mongodb-connection! connection)

The above code prints more or less like this output (formatted for readability):

(("_id" (object-id "5b1110aa9614bc720de985b6"))
 ("id" 1)
 ("name" "R6RS MongoDB library")
 ("lang" "R6RS Scheme")
 ("comment" "Portable Scheme library"))
(("_id" (object-id "5b1110aa9614bc720de985b8"))
 ("id" 2)
 ("name" "R7RS PostgreSQL library") 
 ("lang" "Scheme")
 ("comment" "Portable Scheme library"))
#()

Documents

Supporting implementations

The following implementations are tested:

Sagittarius 0.9.2
Larceny 1.3
Chez Scheme v9.5

For Chez Scheme

Chez Scheme requires the shared object made of src/mongodb/net/tcp/chez.c file which provides simple socket interface for Chez Scheme. The file is written C however, it can only be compiled on POSIX environment (only tested on Ubuntu). The build command is the following:

$ gcc -fPIC -shared -O3 src/mongodb/net/tcp/chez.c \
  -o src/mongodb/net/tcp/chez.so

The shared file name must also be the one specified above (even on OS X).

If you have better solution, please send a PR.

Extension libraries

There're implementation dependent extension libraries as well. These are located under the contrib directory.