Application Properties¶
Here you can find the reference of all the settings that you can apply
to Wrench by editing your Wowza application’s Application.xml
file. You can create and edit these properties using the Wowza Streaming Engine Manager’s
user interface as well. These properties have to go into the <Properties>
section of
your file as follows:
<?xml version="1.0" encoding="UTF-8"?>
<Root version="1">
<Application>
<Name>live</Name>
<!-- trimmed -->
<Properties>
<Property>
<Name>wrench.db.driver</Name>
<Value>com.mysql.jdbc.Driver</Value>
</Property>
</Properties>
</Application>
</Root>
Database Connection Settings¶
When using Wrench in a setup that requires interaction with a relational database, you need to configure the below properties to establish a link between Wrench and the DB.
A single database is used for all SQL operations, there is no way (currently) to hit different databases for the different queries. Wrench uses standard JDBC connection, so you can set a number of connection properties by putting them into the connection URL.
The database driver class has to be on Wowza Streaming Engine’s classpath, typically you
can achieve this by copying the JDBC driver jar file to the lib
directory
of your Wowza installation (see Installing Wrench chapter) The JDBC driver for every major database can be looked up fairly
easily with Google, where you can look up the exact name of the driver
class you need to use.
If you don’t need a database, because you configure Wrench to use REST API calls for integration then setting
wrench.db.driver
to an empty string will disable the database related features, but the web service
based features still remain.
wrench.db.driver
¶
The name of the JDBC driver class. The default is for MySQL, but if you don’t want to use any
database features, you need to set in explicitly to empty string to go into no-database mode. Default: com.mysql.jdbc.Driver
wrench.db.url
¶
The JDBC url to your database that is used to establish the database connection Default: jdbc:mysql://localhost:3306
wrench.db.user
¶
The username used to connect to the db. Default: root
wrench.db.pass
¶
The password used to connect to the db. Default: empty string
Database Connection Pool Settings¶
Due to the heavy usage of the backing database, Wrench uses Tomcat Pool to pool database connections. The current release lets you set some of the most typical settings of Tomcat Pool.`
wrench.dbcp.initial.size
¶
Initial number of DB connections opened in the connection pool. Default: 1
wrench.dbcp.max.size
¶
The maximum size of the connection pool. Default: 1
wrench.dbcp.max.wait
¶
The maximum number of milliseconds that the pool will wait (when there are no connections available) for a connection to be returned before throwing an exception, or -1 to wait indefinitely. Default: -1
wrench.dbcp.test.on.borrow
¶
Set to true
if you want DBCP to test connections before giving them to Wrench.
This prevents client errors that occur if the DB closes a connection in the pool.
The drawback is the increased DB load. Default: false
wrench.dbcp.test.sql
¶
The SQL query executed to validate connections borrowed from the pool before using them.
Use something simple, like select 1
Token Settings¶
The token in this context is the one-time-password that is generated by your website/webapplication and is placed into the database together with the information about the user who got the token. This records enables Wowza Wrench to verify player connections and associate Wowza stream players (client in their terminology) with your users.
wrench.encoder.token
¶
The hardcoded token that can be used by your encoders, e.g. your Flash Media Live Encoder (FMLE) or ffmpeg to push the stream. Specifying this token in the connection allows clients (both players and publishers) to pass through Wrench’s authentication and authorization layers. If you don’t set this property, Wrench will require all connections, including the encoder to present a valid token in the connection url. The recommended setting is not having an encoder token specified.
wrench.token.url.parameter
¶
The query parameter in the connection URLs that carry the tokens. E.g. http://myserver/myapp/mystream?t=abc123
Default: t
wrench.token.resolver.sql
¶
The SQL query which should return the resolution details for a given token. You can skip setting this if you are using web service for token resolution, in that case set wrench.token.resolver.url instead.
The substituted parameter in the query is: :hashedtoken which contains the token from the connection URL passed through the hashing algorithm specified by wrench.token.hashing
The query is expected to return the username in column username (this is mandatory), the IP address in column ip (optional), the token’s generation timestamp in column timestamp (needed only if token expiration check is enabled, the type of the client (i.e. encoder or player) in column encoder with boolean datatype or string true/false You can optionally return a numeric column bitratelimit which is the maximum allowed bitrate for the client.
- Example query:
select user as username, ip, timestamp from wtb_tokens where token=:hashedtoken
wrench.token.resolver.url
¶
The URL of the web service responsible for determining the username, token generation timestamp, and associated IP address for a given token. This config parameter excludes the usage of wrench.token.resolver.sql mutually. The message sent to the web service is:
{"applicationName": "live", "applicationInstance":"_default_",
"token":"foobar"}
The expected response format is:
{ "username":"john", "timestamp (optional)": 1430484962,
"encoder (optional)": true, "ip (optional)": "192.168.1.1",
"bitrateLimit (optional)": 100000 }
Only the username field is mandatory from the above example response.
wrench.token.hashing
¶
The hashing algorithm that is used for storing the generated tokens in the database.
For security reasons it is not wise to store raw tokens, you should only store their hashes.
Possible values are: md5
, sha512
and plain
(at your own risk)
Default: md5
wrench.token.invalidate.sql
¶
A SQL query that is executed right after the token has been resolved. This can be used to flag a row in the table as already used, to prevent re-using the token later. In that case you need to filter used tokens out in the where condition of your token resolver query.
Substituted parameters are: :hashedtoken and :username.
Example that physically removes used tokens: delete from wtb_tokens where token=:hashedtoken
wrench.token.ip.check
¶
If set to true, the connection is only accepted if the client’s IP address
matches the one bound to the token. The expected IP address
has to be returned in the ip
column from the token resolver query or the ip
attribute in the token resolver web service JSON response object. Default: false
IP address can be taken from a configured HTTP header wrench.ip.override.http.header if the server sits behind a proxy.
wrench.token.expiry.sec
¶
The number of seconds in which a token expires. Expired tokens are not accepted. The token’s generation timestamp has to be returned by the token resolver query in the timestamp column or in the timestamp attribute in the token resolver web service JSON response object.
When retrieving via SQL, this column can be of any numeric type, in this case it is assumed to be a Unix timestamp. If it is a date-like datatype, it is converted to Unix timestamp internally assuming the timezone of the JVM.
The default value
is 0 which is interpreted as no expiry checking.
Duplicate Checking Settings¶
wrench.duplicate.check
¶
If set to true, all connections are only accepted if there is no active player with the same username (or token if configured so).
You can also set up a tolerated concurrent session number by specifying wrench.duplicate.limit
.
Please note that upon ungraceful disconnection of the players, it might take a while for Wowza to notice the disconnection.
This is controlled by the VHost’s idleDisconnectTimeout
setting.
Default: false
wrench.duplicate.limit
¶
Controls the maximum allowed concurrent sessions per user. Works only if duplicate checking is enabled by wrench.duplicate.check
. Default: 1
wrench.duplicate.drop.other
¶
If enabled, given you have a limit of n concurrent players set by wrench.duplicate.limit
, when the n+1-th player connects,
the connection is accepted, but a randomly picked other user is going to be dropped. Default: false
wrench.duplicate.check.sql
¶
When specified Wrench will use this SQL query to check concurrent players instead of using the in-memory list of current players.
This feature comes handy when you want to check concurrent players across a set of edge servers in a cluster.
The query must return a single number telling Wrench the number of current players.
You can use the wrench.connect.accept.sql
query to populate the list of players in the database,
and use the wrench.disconnect.log.time.sql
to remove entries. The wrench.duplicate.drop.other
feature is not working
if the checking mode is SQL based. Parameters: :username
wrench.duplicate.check.mode
¶
Controls the attribute which is checked when duplicates are searched. The default value is username
,
that means two sessions with the same resolved username are assumed the same. This is the most natural,
however in some cases people want the token
to be the base of the checking, not the username.
Additional Token Checks¶
wrench.user.agent.blacklist
¶
Specifies the HTTP User-Agent
header (or Flashver in case of RTMP clients) blacklist regular expression. Example: .*VLC.*
wrench.user.agent.whitelist
¶
Specifies the HTTP User-Agent
header (or Flashver in case of RTMP clients) whitelist regular expression.
wrench.http.referrer.blacklist
¶
Specifies the Http-Referer
header blacklist regular expression
wrench.http.referrer.whitelist
¶
Specifies the Http-Referer
header whitelist regular expression
wrench.http.autoaccept.ticket.count
¶
The number of subsequent connections made from the same IP with the same token that are automaticall accepted. This is needed when the website contains a direct link to the stream and the browser and the media player application both connect, but we don’t want to count them as separate connections. Default: 3
wrench.http.autoaccept.ticket.timeout
¶
The timeout value in seconds that belongs to the wrench.http.autoaccept.ticket.count
feature. Subsequent connections
from the same IP and with the same token are treated as a single connection. Default: 15
wrench.rtp.check.enable
¶
If disabled Wrech won’t react to RTP session creation and destroy events (onRTPSessionCreate
and onRTPSessionDestroy
).
This feature can be used for RTSP IP camera sources, where the camera is not able to pass even a hardcoded token for Wrench.
You’ll still have all features for RTMP and HTTP based players. Default: true
wrench.http.streamer.request.check.enable
¶
Enables an extra check on all incoming HTTP queries, not just the initial one that is fetching the m3u8 file.
This is effective against direct chunklist access attempts and is recommended to be turned on. Default: false
wrench.bypass.ip
¶
You can define a comma separated list of IP addresses (or subnets with CIDR notation), which go to a whitelist. Any connection, encoder or client is accepted from these addresses. This can be used in case of hardware encoders that don’t support query parameter sending in the URL.
wrench.bypass.publish.allowed
¶
If enabled, then connections from the configured bypass IP addresses are always allowed to publish, no authorization
is made via web service or SQL. This is a convenience property for these cases. Default: false
wrench.bypass.play.allowed
¶
If enabled, then connections from the configured bypass IP addresses are always allowed to play a stream, no authorization is made via web service or SQL. This is a convenience property for these cases. Default:
false
wrench.force.secure.transport
¶
When enabled, only HTTPS and RTMPS connections will be accepted, non-secure transports will be refused. Default: false
wrench.publish.encoder.flag.check
¶
When enabled, this makes Wrench more strict about which clients are allowed to publish a stream.
The token resolution SQL/web service can optionally return an encoder
flag information, that tells Wrench the role of the client.
If this checking is on, then only those clients are allowed to publish, who have this flag set to true.
By default Wrench is unaware of this role and allows publishing for all clients. Default: false
wrench.ip.override.http.header
¶
The case insensitive name of the HTTP header which Wrench can assume to contain the IP address if the server is behind a proxy, e.g. X-Forwarded-For
.
When using Chrome’s Lite mode, the Google servers might fetch the m3u8 data from a different IP address before the mobile device would
start playback. In this scenario this setting can be used to correlate the two events.
wrench.auth.failed.video.http.url
¶
The URL of the video where the HTTP based players are redirected to if authorization fails.
wrench.auth.failed.video.rtmp.url
¶
The URL of the video where the RTMP based players are redirected to if authorization fails
Client Lifecycle Hooks¶
These SQL and web service hooks allow you to precisely log user events in
your system. If wrench.publish.http.url
is set, the lifecycle events
are published as HTTP POST messages with JSON payload to your
web service.
Token resolution takes place first (via SQL or web service call) (unless the connection comes from bypassed IP or using special token for encoders)
Connection authorization (
wrench.connect.authorization.sql
)Connection accepted (
wrench.connect.accept.sql
)Duplicate player dropped (
wrench.duplicate.drop.sql
) if duplicate checking is on and a drop happensPublish authorization (
wrench.publish.authorization.sql
) if the connected user wants to publish somethingDisconnect (
wrench.disconnect.log.time.sql
) when the client disconnects. This happens immediately in case of RTMP protocol, and with a certain delay in case of HTTP protocol.
wrench.connect.authorization.sql
¶
Optional. If set, it is executed whenever a user successfully passed the token check. If the query returns at least one row,
the authorization is successful, otherwise the connection is refused.
Parameters: :username
, :stream
, :encoder
. The encoder
value is either true
or false
depending on the role determined
by the token resolver query or the web service response.
wrench.connect.authorization.url
¶
If set, this enables an external web service HTTP POST upon each incoming connection. The body of the message is in JSON format:
{"streamName": "mystream", "userName":"john", "token":"54ddec75e2294",
"applicationName":"live", "applicationInstance":"_definst_"}.
The expected response is HTTP 200 with a JSON content: {"result": "allow/deny"}
.
The connection is processed depending on the response. If any communication error occurs, or non HTTP 200 response is received,
the result is defined by the wrench.connect.authorization.url.default.result
property as a fallback value. It is usually
better optimistically allowing access to streaming in case of a service outage rather than blocking customers.
wrench.connect.authorization.url.default.result
¶
The assumed authorization outcome result in case of any communication error, non-parseable JSON response or any HTTP response other than 200.
It might be better optimistically allowing access to streaming in case of a service outage rather than blocking customers.
By default it is false
wrench.connect.accept.sql
¶
Optional. If set, it is executed whenever a client successfully connected. Parameter: :username
, :token
, :hashedtoken
, :ip
wrench.disconnect.log.time.sql
¶
SQL query that is executed when any client disconnects. Can be used for simple audit purposes.
Parameters are: :username
, :session
, :stream
and :elapsedtime
this one contains the
seconds elapsed since the player connected.
For HTTP based players there is no permanent connections, so this is executed after a certain idle period. For RTMP clients this is executed immediately when the connection is closed.
wrench.publish.authorization.sql
¶
Optional. If set, it is executed whenever an RTMP or RTP client starts publishing a stream.
If it returns zero rows, the publishing is denied, otherwise publishing is allowed. Parameter: :username
, :stream
wrench.publish.http.url
¶
An arbitrary URL where Wrench sends HTTP POST messages in JSON format when stream events occur.
Events are: Publish
, Unpublish
, Pause
, Start
, Play
, Stop
, PauseRaw
, Disconnect
.
The format of the JSON message is: {stream: "streamname", user: "username", event: "eventname"}
.
This feature can be used to notify an external system about these events. The username is the username of the connecting encoder, which assumes that in this scenario encoders won’t use the encodersecret hardcoded token, but will connect as regular users with dynamic token.
Disconnect events are only published if wrench.disconnect.publish
is turned on.
wrench.duplicate.drop.sql
¶
If set, it is executed for audit purposes whenever a client is dropped due to the duplicate checking mechanism kicking in,
which of course, needs to be enabled the same time. Parameter: :username
wrench.disconnect.publish
¶
Controls whether disconnect events are published to the wrench.publish.http.url
or not. Default: false
Pay-per-minute and pay-per-view configuration¶
Wrench enables you to accurately measure stream consumption for accounting or statistical purposes. The pay-per-view feature allows you to count how many times each user started watching your stream (allowing a small non-counted grace period). The pay-per-minute SQL hooks make allow you to measure the time spent watching the stream.
The following SQL queries all have to be tailored to your DB schema and the syntax of your RDBMS. The possible properties that you can use in the queries are:
:username
- the username, resolved by Wrench based on the passed token:application
- the name of the Wowza application:elapsedtime
- the number of elapsed seconds (also fractions, as returned byclient.getElapsedTime().getTimeSeconds()
):session
- a unique identifier of the user’s session generated by hashing the username and the connection time
Property |
Description |
Example |
---|---|---|
|
The period of the monitor job which performs all PPV and PPM data capture. This determines the minimum resolution in time of your captured data. |
Default: 60 |
|
Clients disconnecting before this period are not captured by the pay-per-view monitor, so effectively their connection does not count |
Default: 5 sec |
|
This query is
executed whenever the
|
|
|
This is executed whenever a new user’s connection time exceeds the grace period. |
|
|
This query is
executed for all
users each time the
monitor job is
running. This should
be used to update the
playing time for each
client. The
|
|
|
This query is
executed whenever the
|
``insert into wtb_min utes (user, applicati on, total, session) v alues (:username, :ap plication,0,:session) `` |
|
If set, this query is executed periodically on each monitor run. If the query returns 0 rows, the client is immediately dropped. This can be used to dynamically check its PPM balance and drop users if their balance goes down |
|
|
(Since 2015.03.26)
If set to true
(default is false),
the PPM engine will
POST JSON messages to
the configured
|
Dynamic public mode switching¶
Wowza Wrench can temporarily disable its authorization and authentication process and allow access to your streams publicly. This mode can be useful if you are broadcasting a live event and want to make a part of it public, such as the opening ceremony of a football match. Wrench knows which clients came for free and which ones were verified and unverified. While in public mode, users with proper token will be verified and not dropped when you switch back to secured mode. The switching mechanism can be as simple as creating and deleting a particular file on your file system, or returning or not returning rows from an arbitrary SQL query.
Property |
Description |
Default |
---|---|---|
|
Set to |
|
|
The period time of mode checking in seconds |
10 |
|
The switch mechanism
you want to use. Can
be |
|
|
The name of the file
used to determine
current mode if check
mode is set to
|
|
|
The SQL query used to
determine current
mode if check mode is
set to |
When going from public mode to secured, you should see this in the logs (INFO level):
INFO Switching from public mode to secured mode, dropping all unverified clients
...
INFO Dropped total .. clients
DEBUG Dropped clients with id: 425324364,178617697,238476823...
User interface and logging¶
Property |
Description |
Default |
---|---|---|
|
(Since 2014.11.05)
If set to |
|
|
(Since 2016.01.01) Set to true to enable the web user interface of Wrench that allows on-the-fly configuration of Wrench as well as management functions. |
|
|
(Since 2016.01.01) The TCP port used by the web user interface. |
|
This is how the web user interface looks like:
The user interface becomes available when the Wowza application in which Wrench is set up is actually started. This happens when a stream is published into that application or when the first player connects. This is what you should see in the logs if the UI is configured properly:
15:22:01 WMSLogger wrenchexample1 INFO - Started Wrench UI on http://localhost:4567/wrench/login
15:22:01 WMSLogger wrenchexample1 INFO - wrenchexample1/_definst_
15:22:01 WMSLogger wrenchexample1 INFO -
15:22:01 SparkServer wrenchexample1 INFO - == Spark has ignited ...
15:22:01 SparkServer wrenchexample1 INFO - >> Listening on 0.0.0.0:4567
15:22:01 Server wrenchexample1 INFO - jetty-9.0.z-SNAPSHOT
15:22:01 AbstractConnector wrenchexample1 INFO - Started ServerConnector@31a44027{HTTP/1.1}{0.0.0.0:4567}
The username and password for login are those of the Wowza Streaming
Engine Manager that can be found in the admin.password
file under
Wowza config
directory.
Fine tune logging¶
When using Wrench in multiple applications on the same server, you might
want to inject the Wowza application name into the log messages, so you
can separate the interleaved events. (You can also achieve this by
configuring different logfile for each application). Wrench puts the
applicationName
and applicationInstanceName
into the so called
MDC context of
log4j.
This allows you to specify these in the log output pattern this way:
# Console appender
log4j.appender.stdout=org.apache.log4j.ConsoleAppender
log4j.appender.stdout.layout=org.apache.log4j.PatternLayout
log4j.appender.stdout.layout.ConversionPattern=%d{HH:mm:ss} %C{1} %X{applicationName} %-5p - %m%n
This will result in the following output on stdout:
15:22:01 WMSLogger wrenchexample1 INFO - Client connecting with id 307819994 and query string
...
15:22:01 WMSLogger wrenchexample1 INFO - Accepted encoder connection from IP 127.0.0.1
15:23:02 WMSLogger wrenchexample1 INFO - Performing monitor activity over 1 connected clients (rtmp: 1, http: 0, rtp: 0)
15:23:02 WMSLogger wrenchexample1 INFO - Wrench Monitor finished successfully in 2ms