320 lines
11 KiB
Smalltalk
320 lines
11 KiB
Smalltalk
"
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(C) 2011 by Holger Hans Peter Freyther
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All Rights Reserved
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU Affero General Public License as
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published by the Free Software Foundation, either version 3 of the
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License, or (at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU Affero General Public License for more details.
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You should have received a copy of the GNU Affero General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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"
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SIPSessionBase subclass: SIPCall [
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| sdp_offer sdp_result invite state |
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<category: 'OsmoSIP-Callagent'>
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<comment: 'I am a high level class to deal with transactions,
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sessions and calls. Right now I do not support forking proxies and
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will simply ignore everything but the first dialog.'>
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SIPCall class >> stateInitial [ <category: 'states'> ^ #initial ]
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SIPCall class >> stateInvite [ <category: 'states'> ^ #invite ]
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SIPCall class >> stateSession [ <category: 'states'> ^ #session ]
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SIPCall class >> stateTimeout [ <category: 'states'> ^ #timeout ]
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SIPCall class >> stateCancel [ <category: 'states'> ^ #cancel ]
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SIPCall class >> stateHangup [ <category: 'states'> ^ #hangup ]
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SIPCall class >> stateRemoteHangup [ <category: 'states'> ^ #remoteHangup ]
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SIPCall class >> stateFailed [ <category: 'states'> ^ #failed ]
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SIPCall class >> stateRedirect [ <category: 'states'> ^ #redirect ]
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LegalStates := nil.
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SIPCall class >> legalStates [
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<category: 'states'>
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^ LegalStates ifNil: [
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LegalStates := {
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self stateInitial -> self stateInvite.
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self stateInvite -> self stateSession.
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self stateInvite -> self stateTimeout.
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self stateInvite -> self stateCancel.
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self stateInvite -> self stateFailed.
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self stateInvite -> self stateRedirect.
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self stateSession -> self stateHangup.
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self stateSession -> self stateRemoteHangup.
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}
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]
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]
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SIPCall class >> fromIdenity: anIdentity host: aHost port: aPort to: aTo on: aUseragent [
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^ self
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on: ((SIPDialog fromUser: anIdentity userString host: aHost port: aPort)
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to: aTo; yourself) useragent: aUseragent identity: anIdentity
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]
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SIPCall class >> fromUser: aUser host: aHost port: aPort to: aTo on: aUseragent [
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| identity array |
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<category: 'creation'>
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array := aUser subStrings: '@'.
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identity := SIPIdentity new
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username: array first;
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hostname: array second;
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yourself.
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^self fromIdenity: identity host: aHost port: aPort to: aTo on: aUseragent
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]
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state [
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<category: 'states'>
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^ state ifNil: [self class stateInitial]
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]
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moveToState: aState [
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<category: 'states'>
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"E.g. we get two remote hang ups as our ack has not arrived."
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self state = aState ifTrue: [^true].
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"Check if there is a state transition"
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(self class legalStates includes: (self state -> aState)) ifFalse: [
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self logError: ('SIPCall(<1s>) transition <2p>-><3p> is not legal.'
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expandMacrosWithArguments: {self callId. self state. aState})
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area: #sip.
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^ false
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].
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state := aState.
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^ true
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]
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createCall: aSDPOffer [
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<category: 'call'>
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(self moveToState: self class stateInvite) ifFalse: [
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self logError: ('SIPCall(<1s>) failed to start.' expandMacrosWith: self callId)
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area: #sip.
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^ false
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].
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sdp_offer := aSDPOffer.
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next_cseq := initial_dialog cseq + 1.
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invite := (SIPInviteTransaction createWith: initial_dialog on: ua with: aSDPOffer cseq: initial_dialog cseq)
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onTimeout: [self callTimedOut];
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onSuccess: [:response :dialog | self callSuccess: response dialog: dialog];
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onFailure: [:response :dialog | self callFailure: response dialog: dialog];
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onNotification: [:response :dialog | self callNotification: response dialog: dialog];
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start;
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yourself
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]
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cancel [
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<category: 'call'>
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(self moveToState: self class stateCancel) ifTrue: [
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self logNotice: ('SIPCall(<1s>) going to cancel it.' expandMacrosWith: self callId)
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area: #sip.
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self unregisterDialog.
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invite cancel.
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^ true
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].
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^ false
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]
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hangup [
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<category: 'call'>
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(self moveToState: self class stateHangup) ifTrue: [
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self logNotice: ('SIPCall(<1s>) going to hangup.' expandMacrosWith: self callId)
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area: #sip.
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self unregisterDialog.
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(SIPByeTransaction createWith: dialog on: ua cseq: self nextCSeq)
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onTimeout: [self hangupTimedOut];
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onSuccess: [:resp :dlg | self hangupSuccess: resp dialog: dlg];
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onFailure: [:resp :dlg | self hangupFailure: resp dialog: dlg];
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start
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].
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]
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callTimedOut [
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<category: 'call-result'>
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self logError: ('SIPCall(<1s>) timed-out.' expandMacrosWith: self callId)
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area: #sip.
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(self moveToState: self class stateTimeout) ifFalse: [
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invite := nil.
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^ self logError: ('SIPCall(<1s>) failed to move to timeout.'
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expandMacrosWith: self callId) area: #sip.
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].
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]
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callSuccess: aResponse dialog: aDialog [
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<category: 'call-result'>
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(self check: aDialog) ifFalse: [
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self logError: ('SIPCall(<1s>) can only have one session. Ignoring.'
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expandMacrosWith: self callId) area: #sip.
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^ false
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].
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(self moveToState: self class stateSession) ifTrue: [
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self logNotice: ('SIPCall(<1s>) session established.'
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expandMacrosWith: self callId) area: #sip.
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sdp_result := aResponse sdp.
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self sessionNew.
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invite := nil.
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^ true
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].
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^ false
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]
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callFailure: aResponse dialog: aDialog [
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<category: 'call-result'>
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(self check: aDialog) ifFalse: [
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self logError: ('SIPCall(<1s>) can only have one session. Ignoring failure.'
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expandMacrosWith: self callId) area: #sip.
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^ false
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].
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"Check if that is a redirect"
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(self handleRedirect: aResponse dialog: aDialog) ifTrue: [
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^self
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].
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(self moveToState: self class stateFailed) ifTrue: [
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invite := nil.
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self logNotice: ('SIPCall(<1s>) call failure.'
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expandMacrosWith: self callId) area: #sip.
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self sessionFailed.
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].
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]
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callNotification: aResponse dialog: aDialog [
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<category: 'call-result'>
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(self check: aDialog) ifFalse: [
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self logError: ('SIPCall(<1s>) can only have one session. Ignoring notification.'
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expandMacrosWith: self callId) area: #sip.
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^ false
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].
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self logNotice: ('SIPCall(<1s>) notification.'
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expandMacrosWith: self callId) area: #sip.
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self sessionNotification: aResponse.
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]
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hangupTimedOut [
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<category: 'hangup-result'>
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self logNotice: ('SIPCall(<1s>) hang-up timedout.'
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expandMacrosWith: self callId) area: #sip.
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]
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hangupSuccess: aResponse dialog: aDialog [
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<category: 'hangup-result'>
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(self check: aDialog) ifFalse: [
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self logError: ('SIPCall(<1s>) can only have one session. Ignoring failure.'
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expandMacrosWith: self callId) area: #sip.
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^ false
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].
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self logNotice: ('SIPCall(<1s>) hang-up success.'
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expandMacrosWith: self callId) area: #sip.
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]
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hangupFailure: aResponse dialog: aDialog [
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<category: 'hangup-result'>
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(self check: aDialog) ifFalse: [
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self logError: ('SIPCall(<1s>) can only have one session. Ignoring failure.'
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expandMacrosWith: self callId) area: #sip.
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^ false
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].
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self logNotice: ('SIPCall(<1s>) hang-up failure.'
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expandMacrosWith: self callId) area: #sip.
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]
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remoteReInvite: aRequest dialog: aDialog [
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"TODO: check if we are in a session..."
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ua respondWith: 200 phrase: 'OK' on: aRequest dialog: aDialog.
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]
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remoteHangup: aRequest dialog: aDialog [
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<category: 'remote-hangup'>
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(self moveToState: self class stateRemoteHangup) ifTrue: [
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self logNotice: ('SIPCall(<1s>) session remotely terminated.'
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expandMacrosWith: self callId) area: #sip.
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ua respondWith: 200 phrase: 'OK' on: aRequest dialog: aDialog.
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self unregisterDialog.
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self sessionEnd.
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].
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]
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terminate [
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<category: 'public'>
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"I try to finish up things."
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self state = self class stateInvite ifTrue: [^self cancel].
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self state = self class stateSession ifTrue: [^self hangup].
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self logError: ('SIPCall(<1s>) terminate not possible in <2p>.'
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expandMacrosWithArguments: {self callId. self state})
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area: #sip.
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]
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handleRedirect: aResponse dialog: aDialog [
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| code |
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code := aResponse code asInteger.
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(code = 301 or: [code = 302])
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ifFalse: [^false].
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(self moveToState: self class stateRedirect) ifTrue: [
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invite := nil.
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self logNotice: ('SIPCall(<1s>) call redirect.'
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expandMacrosWith: self callId) area: #sip.
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self sessionRedirect: (self extractContact: aResponse).
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].
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^true.
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]
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sessionNew [
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<category: 'callback'>
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]
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sessionFailed [
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<category: 'callback'>
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]
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sessionRedirect: aContact [
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<category: 'callback'>
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"Legacy support to just fail"
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^self sessionFailed
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]
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sessionEnd [
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<category: 'callback'>
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]
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sessionNotification: aNot [
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<category: 'callback'>
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]
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newRequest: aRequest dialog: aDialog [
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<category: 'private'>
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aRequest sipCallDispatch: self dialog: aDialog.
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]
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extractContact: aResponse [
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| contact |
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contact := aResponse parameter: 'Contact'.
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contact ifNil: [^nil].
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^contact first
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]
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]
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