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Language:
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Language:
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Chapter 6. File-based configuration
AMQ C++ can read the configuration options used to establish connections from a local file named connect.json
. This enables you to configure connections in your application at the time of deployment.
The library attempts to read the file when the application calls the container connect
method without supplying any connection options.
This feature is currently unavailable on Microsoft Windows.
6.1. File locations
AMQ C++ searches for a file named connect.json
at the following locations and in the order shown. It stops at the first match it encounters.
-
$PWD/connect.json
, where$PWD
is the current working directory of the client process -
$HOME/.config/messaging/connect.json
, where$HOME
is the current user home directory -
/etc/messaging/connect.json
6.2. File format
The connect.json
file contains JSON data, with additional support for JavaScript comments.
Many of the options have default values, so a simple example need only provide a few details:
Example: A simple connect.json
file
{ "host": "example.com", "user": "alice", "password": "secret" }
SASL and SSL/TLS options are nested under "sasl"
and "tls"
namespaces:
Example: A connect.json
file with SASL and SSL/TLS options
{ "host": "example.com", "user": "ortega", "password": "secret", "sasl": { "mechanisms": ["SCRAM-SHA-1", "SCRAM-SHA-256"] }, "tls": { "cert": "/home/ortega/cert.pem", "key": "/home/ortega/key.pem" } }
6.3. Configuration options
The option keys containing a dot (.) represent attributes nested inside a namespace.
Table 6.1. Configuration options in connect.json
Key | Value type | Default value | Description |
---|---|---|---|
| string |
|
|
| string |
| The hostname or IP address of the remote host |
| string or number |
| A port number or port literal |
| string | None | The user name for authentication |
| string | None | The password for authentication |
| list or string | None (system defaults) | A JSON list of enabled SASL mechanisms. A bare string represents one mechanism. If none are specified, the client uses the default mechanisms provided by the system. |
| boolean |
| Enable mechanisms that send cleartext passwords |
| string | None | The filename or database ID of the client certificate |
| string | None | The filename or database ID of the private key for the client certificate |
| string | None | The filename or database ID of the CA certificate |
| boolean |
| Require a valid server certificate with a matching hostname |